The 1 st Design Symposium on Conservation of Ecosystem

Transcription

1 The 1 st Design Symposium on Conservation of Ecosystem (SEASTAR2000) on March 18-19, 2013

2

3 book The 1 st Design Symposium on Conservation of Ecosystem (SEASTAR2000) March 18 19, 2013 Kyoto University Clock Tower Centennial Hall, Kyoto, Japan Organized by Kyoto University Design School

4

5 The 1st Design Symposium on Conservation of Ecosystem (SEASTAR2000) March 18 19, 2013 Kyoto University Clock Tower Centennial Hall, Kyoto, Japan Organized by Kyoto University Design School PROGRAM March 18, :00-10:30 Registration 10:30-10:40 Opening remarks Session 1 Fish Chair: Nobuaki Arai 10:40-11: BIOLOGICAL ASPECTS, FISHERIES AND CONSERVATION STATUS OF GIANT OCEANIC MANTA RAY, MANTA BIROSTRIS FROM INDIAN OCEAN Dharmadi and Fahmi 11:00-11: HABITAT USE OF MEKONG GIANT CATFISH MONITORED USING FINE-SCALE POSITIONING SYSTEM AND ACTIVITY MEASUREMENT IN KAENG KRACHAN RESERVOIR, THAILAND Nao Yoshida, Hiromichi Mitamura, Nobuaki Arai, Thavee Viputhanumas and Deeka Ratanachamnong 11:20-11: OCEAN RELEASE AND RECAPTURE OF THE THIRD GENERATION OF FULL-CYCLE CULTURED PACIFIC BLUEFIN TUNA Wataru Sakamoto and Yuichi Tsuda 11:40-14:30 Lunch 1

6 Session 2 Marine mammals Chair: Anoukchika D Ilangakoon 14:30-14: STRANDING PHENOMENON OF GIANT MARINE ANIMALS IN INDONESIAN WATERS: THE CAUSES AND HANDLING METHODS Fahmi, Kunto Wibowo and Dhamadi 14:50-15: ACOUSTIC TOWING SURVEY FOR MARINE MAMMALS IN LANGKAWI, MALAYSIA, WITH SPECIAL REFERENCE TO INDO-PACIFIC FINLESS PORPOISE AND INDO-PACIFIC HUMPBACK DOLPHIN Satoko Kimura, Louisa Ponnampalam, Tomonari Akamatsu and Ken Yoda 15:10-15: QUANTITATIVE SPECIES IDENTIFICATION BETWEEN HARBOR PORPOISE AND DELPHINID BY BIOSONAR SIGNALS Saho Kameyama,Tomonari Akamatsu, Ayaka Amaha Öztürk, Ayhan Dede and Nobuaki Arai 15:30-15: CASTNET FISHING WITH THE HELP OF IRRAWADDY DOLPHIN, ORCEALLA BREVIROSTRIS, IN MYANMAR Tint Tun 15:50-16:10 Coffee break Chair: Satoko Kimura 16:10-16: SITUATION AND THREAT OF IRRAWADDY DOLPHIN (ORCEALLA BREVIROSTRIS) IN TRAT BAY, TRAT PROVINCE, THAILAND Chalatip Junchompoo, Chatchai Penpein and Nongnuch Sinrapasan 16:30-16: A REVIEW OF THE DECLINE AND CONSERVATION STATUS OF THE DUGONG (DUGONG DUGON) IN SRI LANKA Anoukchika D Ilangakoon 2

7 16:50-17: DUGONG AERIAL SURVEY , DECLINE TREND OF DUGONG POPULATION IN TRANG PROVINCE, THAILAND Phaothep Cherdsukjai, Kongkiat Kittiwattanawong, Shinakorn Thongchai, Patcharaporn Kaewmong, Nisarat Tawisuwan, Piyawut Sukthong, Hirun Kanghae, Eduardo A. Loigorri, Ngampol Vangtapan, Narongpol Sakcharoen, Pratchaya Suwanpattana and Kanjana Adulyanukosol 17:10-17: STUDY OF BRYDE S WHALE IN THE UPPER GULF OF THAILAND Surasak Thongsukdee, Kanjana Adulyanukosol, Surachai Passada and Theerawat Prempree 18:00-20:00 Reception at Café Restaurant CAMPHORA March 19, 2013 Session 3 (Poster) Chair: Hideaki Nishizawa 9:30-11:30 P001 BEHAVIOR ANALYSIS OF PACIFIC BLUEFIN TUNA (THUNNUS ORIENTALIS) USING GYROSCOPE DATA LOGGERS Masakazu Ishikawa, Takuji Noda, Hiromichi Mitamura, Ko Fujioka, Hiromu Fukuda and Nobuaki Arai P002 DEVELOPMENT OF A FINE-SCALE ACOUSTIC POSITIONING AND TELEMETRY SYSTEM FOR SCHOOLONG BEHAVIOR OF BLUEFIN TUNA Kazunori Kikuchi, Kotaro Ichikawa, Ko Fujioka, Hiromu Fukuda, Hiromichi Mitamura and Nobuaki Arai P003 DEVELOPMENT AND EVALUATION OF ULTRASONIC TRANSMITTER USING FREQUENCY MODULATION FOR BIOTELEMETRY Masahiro Nakagawa, Kotaro Ichikawa, Toyoki Sasakura, Hiromichi Mitamura and Nobuaki Arai 3

8 P004 ENVIRONMENTAL IMPACT ASSESSMENT OF THE HUTGYI HYDROPOWER PROJECT IN THAILAND: ENVIRONMENTAL ASPECTS AND FISH MIGRATION S. Chavanich, S. Piyateratitiworakul, N. Arai, S. Piyapattanakorn, C. Nitithamyong, V. Viyakarn1,, P. Somgpongchaiyakul, P. Singhruck1, J. kettratad, S. Chanchungjit, J. Sirirat and T. Sriburi P005 THE EVALUATION OF VPS SYSTEM FOR MEASURING FINE-SCALE MOVEMENT OF SNOW CRAB IN DEEP SEA AREA Hiroaki Yamoto, Nao yoshida, Kazuki Kanawa, Hiromichi Mitamura, Tetsuya Ohtani, Tameo Ozaki and Nobuaki Arai P006 CYCLIC CHANGE OF DUGONG S VOCAL BEHAVIOUR Yuuki Matsuo, Kotaro Ichikawa, Noriko Mizobata, Kozue Kinoshita and Nobuaki Arai P007 ENERGY STRATEGY OF FEMALE GREEN TURTLES DURING INTER-NESTING PERIOD IN ISHIGAKI ISLANDS, JAPAN Yuka Obe, Junichi Okuyama, Hideaki Nishizawa, Tohya Yasuda, Masato Kobayashi and Nobuaki Arai P008 AN APPLICATION OF VIDEO ANALYSIS TO THE COGNITIVE STUDY: THE RELATIONSHIP BETWEEN LOOKING-AROUND BEHAVIOR OF GREEN TURTLES AND THEIR HABITAT ENVIRONMENT Kana Nakajima, Junichi Okuyama, Kenta Matsui, Kazuaki Kondo, Takahiro Koizumi, Yuichi Nakamura, Ayana Wada, Nobuaki Arai and Shiro Kagawa P009 COMPARISON OF BEHAVIORAL RESPONSE TO COLD WATER BETWEEN GREEN AND LOGGERHEAD TURTLE JUVENILES Runa Tabata, Ayana Wada, Junichi Okuyama, Yuka Obe, 4

9 P010 Kana Nakajima, Nobuaki Arai and Masato Kobayashi INDIVIDUAL DIFFERENCE OF DUGONG VOCALIZATION Sakura Komiyama, Kotaro Ichikawa and Nobuaki Arai P011 MIGRATION OF GREEN TURTLE HATCHLINGS IN THREE NESTING SITES OF JAPAN INFERRED FROM NUMERICAL SIMULATION MODELING Ayana Wada, Junichi Okuyama, Kei Zenimoto, Takashi Kitagawa, Shingo Kimura, Nobuaki Arai, Yoshikazu Sasai and Hideharu Sasaki 11:30-13:30 Lunch Session 4 Sea grass Chair: Tint Tun 13:30-13: CONSERVATION AND MANAGEMENT OF SEAGRASS HABITATS IN SOUTHEASTERN INDIA - SUPPORT STRATEGY FOR PROTECTION OF EXISTING DUGONG POPULATION J.K. Patterson Edward 13:50-14: CONNECTIVITY OF UPSTREAM WATER QUALITY TO NEARSHORE SEAGRASS HABITAT Lucero, Ruth S., Maria Felez B. Matignao, Michelle Elemino, Eustine Maru S. Lucero, Gregory T. King, Masumi Yamamuro, Peter Y. Labis and Matias J. Lucero Session 5 Sea turtle Chair: Matias J. Lucero 14:10-14: POSITIVE IMPACT OF THE TURTLES CONSERVATION DEVELOPMENT TO THE SOCIO-ECONOMY OF COASTAL COMMUNITY PANGUMBAHAN BEACH, SUKABUMI REGENCY, WEST JAVA, INDONESIA Ngurah N Wiadnyana and Adriani Sri Nastiti 14:30-14: DIFFERENCE IN FLIPPER BEATING FREQUENCY OF GREEN TUTRLES IN WATER AND ON LAND 5

10 Hideaki Nishizawa, Junichi Okuyama, Tohya Yasuda, Nobuaki Arai and Masato Kobayashi 14:50-15: WHEN DO GREEN TURTLES MOVE UP TO THE SHALLOW WATERS? A REVIEW OF FORGING TRIP OF GREEN TURTLES (CHELONIA MYDAS) TO SEAGRASS MEADOWS Junichi Okuyama and Nobuaki Arai 15:10-15:30 Coffee break Chair: Junichi Okuyama 15:30-15: THE JORDAN S NATIONAL ACTION PLAN (NAP); AN APPROACH TO IDENTIFY AND PRIORITISE A SET OF ACTIONS RELATED TO THE CONSERVATION OF MARINE TURTLES AND THEIR HABITATS IN GULF OF AQABA, RED SEA Mohammad K. Al-Zibdah 15:50-16: COMMUNITY - BASED PROTECTION, CONSERVATION AND SOME BIO-ECOLOGICAL NOTES OF SEA TURTLES IN DAHICAN BEACH, MATI CITY, PHILIPPINES Lea AngSinco-Jimenez, Sherwin Edgar B. Atoy, Bernadette J. Nanual1 and George J. Plaza 16:10-16: VULNERABILITY ASSESSMENT OF MARINE TURTLES TO SEA LEVEL RISE Lucero, Matias J., Saturnino C. Parcasio, Jr., Peter Y. Labis, Ruth S. Lucero and Helen W. Noel 16:30-17:00 General discussion and Closing remarks 6

11 ABSTRACT (Oral) 7

12

13 001 BIOLOGICAL ASPECTS, FISHERIES AND CONSERVATION STATUS OF GIANT OCEANIC MANTA RAY, MANTA BIROSTRIS FROM INDIAN OCEAN Dharmadi* 1 and Fahmi** 2 * Research Center for Fisheries Management and Conservation, Ministry of Marine Affairs and Fisheries. Gd. Patra Jasa Lt I, Jl. Gatot Subroto Kav Jakarta Selatan ** Research Center for Oceanography-Indonesian Institute of Sciences Keywords: biological aspects, fisheries, conservation status, Manta birostris, Indian Ocean The Giant Oceanic Manta Ray (Manta birostris), is a ray species of the Family Mobulidae, the largest type of ray in the world. This research was conducted from April 2001 to August 2005 at Cilacap-Central Java and Tanjung Luar-East Lombok fish landings. Catch data of Cilacap fishing port from 2006 to 2011 were also presented in this paper. Direct observations and data collections by enumerators were used for the research methodology. The results showed that this species was caught as by-catch of tuna gillnet and tuna longline in the Indian Ocean. There were three age groups (cohorts) of the Manta birostris caught in the Indian Ocean, i.e. size class between cm disc width (DW) as a young group, cm DW (subadult group), and cm DW (adult group), respectivelly. The sex ratio of males and females of Manta birostris was 1:1 (P>0.05). Monthly production of Manta birostris during six years ( ) indicated that the highest production occurred in May- September. Almost all of the body of this species are utilised, for instance, the gill filter plates and cartilage for medicines (very high value), and meat for consumption. Based on IUCN Red List the conservation status of Manta birostris is near threatened and vulnerable in South-East Asia. 1 darma_ancol@yahoo.com 2 fahmi_lipi@yahoo.com 9

14 002 HABITAT USE OF MEKONG GIANT CATFISH MONITORED USING FINE-SCALE POSITIONING SYSTEM AND ACTIVITY MEASUREMENT IN KAENG KRACHAN RESERVOIR, THAILAND Nao Yoshida 1, Hiromichi Mitamura 1, Nobuaki Arai 1, Thavee Viputhanumas 2 and Deeka Ratanachamnong 2 1 Graduate School of Informatics, Kyoto University 2 Inland Fisheries Research and Development Bureau, Department of Fisheires Keywords: Endangered species, Pangasianodon gigas, biotelemetry, VPS, acoustic acceleration transmitter Mekong giant catfish Pangasianodon gigas is an endemic species in the Mekong river basin and one of the largest freshwater fish in the world. The catfish is a commercially important in Thailand; however, the amount of wild catfish was drastically decreasing these days. The catfish is listed in the CITES Appendix Ι and IUCN Red List of threatened species as a Critically Endangered Species. Our objective is to elucidate habitat use of Mekong giant catfish for their conservation. For this purpose, we developed fine-scale positioning system (VR2W Positioning system, VPS) and activity measurement. In VPS, positions of tagged individuals are calculated by measuring the difference in arrival times of pings among a minimum of three passive acoustic receivers (VR2W, Vemco, Canada). For activity measurement, we used acoustic acceleration transmitters, which measure acceleration and transmit the activity index of the target species. The field experiment was conducted at Kaeng Krachan reservoir, Petchaburi Province from July in We constructed VPS using 24 VR2Ws and monitored fish movement. 11 hatchery-reared juvenile Mekong giant catfish (TL= 86.5±2.69 cm) were surgically inserted acoustic acceleration transmitters (V13AP, Vemco, Halifax, Canada) into their abdominal cavity. The tagged fish were released into the reservoir on 11 th July. For 4 months after their release, 3 fish remained in VPS area and 8 fish left just after the release. We succeeded to measure the fine-scale migration pathway and measure the fish activity. They moved widely in the reservoir and showed relatively low activity. n-yoshi@bre.soc.i.kyoto-u.ac.jp 10

15 003 OCEAN RELEASE AND RECAPTURE OF THE THIRD GENERATION OF FULL-CYCLE CULTURED PACIFIC BLUEFIN TUNA Wataru Sakamoto and Yuichi Tsuda Fisheries Laboratory, Kinki University The closed full-life cycle aquaculture of bluefin tuna was established in In 2012, their descendants continuously become the third generation. They spend fll life cycle in the net cage and never experience oceanic environment. Therefore they are neither experience escape from dangerous attack by predators nor chase to capture prey themselves. It is unknown whether they can survive in the ocean or not when they are released in the wild environment. We tried to examine the possibility their survival ability to release the third generation full-cycle cultured bluefin tuna to the ocean. If we can recapture them more than one month later from release, it is possible to estimate that they have the ability to survive in the ocean. We tried to release them on October 21 using 1862 tag attached individuals. Among them, 11 were surgically implanted data loggers in peritoneal cavity as well as spaghetti type dart tags. 11

16 004 STRANDING PHENOMENON OF GIANT MARINE ANIMALS IN INDONESIAN WATERS: THE CAUSES AND HANDLING METHODS Fahmi 1, Kunto Wibowo 1 and Dhamadi 2 1 Research Center for Oceanography-Indonesian Institute of Sciences 2 Research Center for Fisheries Management and Conservation, Ministry of Marine Affairs and Fisheries Keywords: stranding, whale, shark The stranding phenomenon of marine animals such as whales, dolphins, whale sharks or megamouth shark is happening almost every year in Indonesian waters. There were five events of stranding whales and three events of stranding whale sharks have been recorded from all over the country during Several factors were suggested to be the causes of this phenomenon and will be discussed in this paper. Navigation problem seems to be a main factor for standing whales while plentiful food availability in the coastal areas became a major factor for causing stranded whale sharks. A standard of procedure for handling stranded marine animals have been developed in Indonesia. Three different treatments will be applied to the stranded animal depending on the condition and the position of the animal. The living stranded animal is devised to be rescued and release it back to the ocean without any harm, while the dead animal will be treated for scientific and educational purposes. fahmi_lipi@yahoo.com 12

17 005 ACOUSTIC TOWING SURVEY FOR MARINE MAMMALS IN LANGKAWI, MALAYSIA, WITH SPECIAL REFERENCE TO INDO-PACIFIC FINLESS PORPOISE AND INDO-PACIFIC HUMPBACK DOLPHIN Satoko Kimura 1, Louisa Ponnampalam 2, 3, Tomonari Akamatsu 4, 5 and Ken Yoda 1 1 Graduate School of Environmental Studies, Nagoya University 2 Institute of Ocean & Earth Sciences, University Malaya 3 The MareCet Research Organization 4 National Research Institute of Fisheries Engineering, Fisheries Research Agency 5 Japan Science and Technology Agency, CREST Keywords: echolocation, cetacean, visual observation, conservation, management Dolphins and porpoises produce powerful high frequency sonar sound called a click, sequence of clicks or a click train, and receive the echo to perceive the environment and objects including prey item. In recent years, researchers have taken advantage of this to apply passive acoustic monitoring for detection of the animal by using both fixed and towed sound-detection platforms. However, the detection performance depends strongly on the phonation behavior of the target animals and sound propagation in the animal s habitat. In this study, the towed platform was applied in Langkawi Island, Malaysia, which is located in the northern reaches of the Straits of Malacca, in September The sound detections of the Indo-Pacific finless porpoise (Neophocaena phocaenoides) and Indo-Pacific humpback dolphin (Sousa chinensis) were compared with visual observations of both species. The number of animals was counted using independent sound source directions by the recording of multiple hydrophones. In total, 20 groups were detected by acoustic observation, while eight groups were sighted visually. Results suggested that acoustic observation had an advantage especially to detect solitary or a few number of animals, which is the common group size of finless porpoises. On the other hand, the acoustic method had a limitation for application to occurrences of larger groups. It underestimated the group size of two groups which consisted of at least 50 and 100 Indo-Pacific humpback dolphins, which was confirmed by visual observation. The recording was partly masked by the sound of snapping shrimps especially near the island s coastline, which might lead to the underestimate of the number of animals. The concurrent detection of cetaceans using acoustic and visual observations is therefore considered to be a more practical approach in areas such as Langkawi where the two species occur. s.kimura@nagoya-u.jp 13

18 006 QUANTITATIVE SPECIES IDENTIFICATION BETWEEN HARBOR PORPOISE AND DELPHINID BY BIOSONAR SIGNALS Saho Kameyama 1*, Tomonari Akamatsu 2, Ayaka Amaha Öztürk 3, Ayhan Dede 3 and Nobuaki Arai 1 1 Graduate School of Informatics, Kyoto University 2 National Research Institute of Fisheries Engineering, Fisheries Research Agency 3 Faculty of Fisheries, Istanbul University / Turkish Marine Research Foundation Keywords: A-tag, Stationary acoustic monitoring method, Phocoenidae, Delphinidae Passive acoustic monitoring system has been used for the presence and density monitoring of cetaceans. However, the acoustic identification method of species is not fully established yet. Previous studies used the difference in acoustic characteristics of the biosonar sounds to identify Phocoenidae out of Delphinidae. However, the accuracy of this method was not well documented so far. In this study, we used a simple comparison to identify Phocoenidae using two-band spectrum ratio at 130 khz and 70 khz in the Istanbul Strait, Turkey, where one phocoenid species, harbor porpoise, and two delphinid species, short-beaked common dolphin and bottlenose dolphin have been observed. An acoustic event recorder (A-tag) with two hydrophones, which are most sensitive at 130 khz and 70 khz, respectively, was fixed at the middle of the Strait from 12 April to 1 June The visual observation was conducted simultaneously to obtain ground truth. We obtained 639 click trains of delphinids, 104 click trains of harbor porpoise confirmed by the visual observation. We calculated the average two-band ratio for each click train. A fixed threshold which provided by mixed ratio of raw data did not show >80% correct detection and <20% of false alarm for both Phocoenidae and Delphinidae at any mixed ratio of both families. We introduced dynamic threshold depending on the mixed ratio of two families to maximize the accuracy of identification. The dynamic threshold could provide the same accuracy above at the mixed ratios which contain from 40% to 72% of harbor porpoise. Proposed dynamic threshold using mixed family ratio had better identification performance than using fixed threshold for species discrimination. * kamesaho@bre.soc.i.kyoto-u.ac.jp 14

19 007 CASTNET FISHING WITH THE HELP OF IRRAWADDY DOLPHIN, ORCAELLA BREVIROSTRIS, IN MYANMAR Tint Tun Marine Science Association, Myanmar (MSAM) Irrawaddy dolphins, Orcaella brevirostris, which live in about 72km segment of the Ayeyawaddy (previously known as Irrawaddy) river in upper Myanmar help castnet fishermen in fishing. Dolphins and fishermen communicate by audio and visual signals during the fishing. Nowadays, cooperative fishing practice between the Irrawaddy dolphins and castnet fishermen in Myanmar has been threatened to be extinct by illegal electric fishing. It is an urgent need to study on aquatic noise signals of dolphins, impacts of signals used by fishermen in communication with the dolphins and other noises such as boat noise on both dolphins and cooperative fishing practice. 15

20 008 SITUATION AND THREAT OF IRRAWADDY DOLPHIN (ORCEALLA BREVIROSTRIS) IN TRAT BAY, TRAT PROVINCE, THAILAND Chalatip Junchompoo, Chatchai Penpein and Nongnuch Sinrapasan Marine and Coastal Resources (Rayong) Keywords: Irrawaddy dolphin, Orcealla brevirostris, Situation and Threat, Trat bay Trat bay is an important area for fishing activities in the eastern coast of Thailand. There is usually found marine mammals particularly Irrawaddy dolphin (Orcealla brevirostris) which is currently in endangered species in Thailand. The information on the distribution and behavior of Irrawaddy dolphins, stranding data and fisheries in Trat bay, during were investigated by transect line and photo identification technique. According to the results of photo identification technique indicated that Irrawaddy dolphins were resident in this area all year round and produced calf during December-February. The group size ranged from 5-20 individuals. Many dolphins were observed swimming and feeding around fishing boats, foraging near artificial reefs and migration pass transportation route. As the results of fishing gears mapping, the most common fishing gears used by the fishery communities in Trat bay are gill nets and crab traps (54% and 25% respectively). Five of Irrawaddy dolphins were found entangled with fishing gears. High density of fishing gears and transportation are likely to be the major threat in this area. Hopefully, the data and information from these studies could be used for further protected area management and planning for dolphin conservation integrating local communities. 16

21 009 A REVIEW OF THE DECLINE AND CONSERVATION STATUS OF THE DUGONG (DUGONG DUGON) IN SRI LANKA Anoukchika D. Ilangakoon Member IUCN Cetacean Specialist Group. Keywords: Historical trajectory, threats, conservation efforts, future prospects. The presence and abundance of the dugong in the waters around Sri Lanka has been documented from as far back as Literature from the 1800s to the mid-1900s documented dugong catches and more recent references expressed concern regarding their survival prospects in these waters. Such concerns during a period when organised annual hunts were still being conducted lead to such government authorised hunts being discontinued. Subsequently with the realisation that dugong populations had been decimated the species was listed as a totally protected mammal under the Fauna and Flora Protection Ordinance of the country in This was an attempt to give it legal protection from further hunting but the decline continued due to several direct and indirect anthropogenic threats that continue. As legal protection alone has not adequately addressed the threats causing the continued decline the future viability of this population may now be at risk. One of the major problems is the paucity of scientific data in the form of population assessments, habitat assessments and threats upon which mitigation measures and conservation action can be based. This review is an attempt to look at the problem from a historical trajectory, from past abundance through years of decline to present critical conservation status in order to reach a better understanding of the threats that need to be addressed immediately if the population is to survive into the future. anouki@zeynet.com 17

22 010 DUGONG AERIAL SURVEY , DECLINE TREND OF DUGONG POPULATION IN TRANG PROVINCE, THAILAND Phaothep Cherdsukjai 1, Kongkiat Kittiwattanawong 1, Shinakorn Thongchai 1, Patcharaporn Kaewmong 1, Nisarat Tawisuwan 1, Piyawut Sukthong 1, Hirun Kanghae 1, Eduardo A. Loigorri 2, Ngampol Vangtapan 3, Narongpol Sakcharoen 4, Pratchaya Suwanpattana4 and Kanjana Adulyanukosol 5 1 Phuket Marine Biological Center 2 Chiang Mai flying club 3 Royal sky aviation 4 Southwing (Thailand) Co.,Ltd. 5 Marine and Coastal Resources Research and Development Center (upper Gulf of Thailand) Keywords: dugong, aerial survey, Muk-Talibong Island The Muk-Talibong Islands in Trang Province is a habitat for the largest dugong population in Thailand. Since 1994, Phuket Marine Biological Center (PMBC) has regularly conducted aerial surveys using small aircrafts i.e. microlite aircraft and 2-seats fixed-wings aircraft. In 2011 and 2012, a small aircraft model Tecnum P92J was used to conduct a line-transected survey. The interval in each line were vary from 500 m. to 2ooo m. depending on areas of interest and perpendicular line transect with shore line were set to cover areas 408 km 2.The survey efforts amounted 4 flights totaling hours, average 3.45 hours per day in 2011 while at 2012, survey efforts amounted 7 flights totaling hours, average 2.28 hours per day. The average dugong detection rate in 2012 (26±14 animals per day) was significantly lower than the one in 2011(51±50 animals per day). And compared of daily maximum count in 2012 was 54 dugongs was also approximately lower in 2011 was 122 too. As a result of comparing the dugong detection rates of each year, a number of dugongs were decreasing even though the aerial survey periods in each year were the same months and tidal times. Reports of dugong stranded in Trang Province were usually showed human activity was threat to them. However, to prove the declination of dugongs in the area need further aerial surveys. haothep1313@hotmail.com 18

23 011 STUDY OF BRYDE S WHALE IN THE UPPER GULF OF THAILAND Surasak Thongsukdee, Kanjana Adulyanukosol, Surachai Passada and Theerawat Prempree Marine and Coastal Resources Research and Development Center (upper Gulf of Thailand) Keywords: distribution, Bryde s whale, population identification, the upper Gulf of Thailand Bryde s whale (Balaenoptera edeni) is a baleen whale that uses baleen plates to filter fish from seawater when feeding. The main food of Bryde s whale is anchovy. In the upper Gulf of Thailand, Bryde s whales are distributed along the coastlines of Phetchaburi, Samut Songkram, Samut Sakhon, Bangkok, Samut Prakan and Chon Buri provinces. The study was conducted during January 2010 December 2012 using photo identification method. The method identified Bryde s whale population through the different characteristics of dorsal fin and other wounds such as marks on dorsal fin, body and fluke. The color patterns at the upper jaws and in the mouth were also observed. The population of 40 Bryde s whales could be identified into 7 females with calves. There were 10 calves in total. The mother and calve pairs stayed together for at least 17 months. Bryde s whales were mostly found between April to November. The coastlines in the upper Gulf of Thailand played an important role in providing feeding ground, breeding ground and nursing ground for Bryde s whales. surasak_43@hotmail.com 19

24 012 CONSERVATION AND MANAGEMENT OF SEAGRASS HABITATS IN SOUTHEASTERN INDIA - SUPPORT STRATEGY FOR PROTECTION OF EXISTING DUGONG POPULATION J.K. Patterson Edward Suganthi Devadason Marine Research Institute Keywords: Seagrass habitats, Conservation, Gulf of Mannar, Palk Bay The Gulf of Mannar and Palk By coasts in Southeastern India occupy luxuriant seagrass meadows, which supports the livelihood of over 100,000 fisher folk through associated fishery resources. The destructive fishing practices like operation of bottom set nets, inshore trawling, as well as the discharge of untreated sewage, are some of the factors of concern to seagrass destruction in this coastal region. Seagrass meadows also form a favourite feeding ground for the marine mammal, Dugong dugon and the protection of existing population requires effective conservation and management of seagrass habitat. As a part of a long term conservation strategy by IUCN for seagrass and dugong habitats in Gulf of Mannar and Palk Bay, baseline data on the diversity, distribution and abundance of seagrass habitats and fishery related threats has been collected. In Gulf of Mannar, the 140 km long coastline between Pamban and Tuticorin has about 101 Km 2 seagrass cover, while in Palk Bay, the 130 km coast between Pamban and Athiramapattinam has about 254 Km 2 seagrass cover. In India, the dugong population depleted drastically and destruction of seagrass meadows is one of the reasons. Over 20% seagrass area is affected in Gulf of Mannar and Palk Bay by fishing activities and other local stressors. Capacity building of fisher youth in seagrass assessment and monitoring, reporting of dugong sighting and dissemination of knowledge products are part of the long term strategy. edwardjkpatterson@sdmri.in, 44-Beach Road, Tuticorin Tamil Nadu, India 20

25 013 CONNECTIVITY OF UPSTREAM WATER QUALITY TO NEARSHORE SEAGRASS HABITAT Lucero, Ruth S. 1, Maria Felez B. Matignao 1, Michelle Elemino 1, Eustine Maru S. Lucero 1, Gregory T. King 2, Masumi Yamamuro 2, Peter Y. Labis 3 and Matias J. Lucero 3 1 Graduate School, SPAMAST, Malita, Davao del Sur 2 Graduate School of Frontier Sciences, University of Tokyo 3 LGU-OMAF, Malita, Davao del Sur The study aimed to gather preliminary water quality information in Malita, Davao del Sur and Mati, Davao Oriental where decline in seagrass beds has been suspected. Water samples were taken along Malita River including a canal from a nearby fishpond and banana/durian plantation as well as stations along the coast of Malita and Mati. The locations were taken using GPS. Conductivity, ph, turbidity (freshwater), surface temperature in situ was measured with sensors (TOA DKK). Depth in the river and ocean was determined using a ruler and depth meter, respectively. Water samples were kept overnight in refrigerator before subjecting to test using the water pack test kit (Kyoritsu) for chemical oxygen demand (COD), ammonium ion, nitrate ion and phosphate ion. Results showed that salinity at the seagrass beds in Mati was lower compared to that in Malita despite its proximity to Pacific Ocean and absence of inflowing water. The observed salinity difference indicates other sources of freshwater in the case of Mati. Stations set upstream showed higher turbidity and lower COD compared to discharges from the canal due to the inflow of floodwater and not because of organic pollutants. Although effluent concentrations were the same for freshwater samples, COD was remarkably higher along the canal. Based on the results, further water quality tests from plantation be considered as well as investigation of possible freshwater sources in Mati to yield a better understanding of its connectivity to the seagrass beds. rs_lucero@yahoo.com 21

26 014 POSITIVE IMPACT OF THE TURTLES CONSERVATION DEVELOPMENT TO THE SOCIO-ECONOMY OF COASTAL COMMUNITY PANGUMBAHAN BEACH, SUKABUMI REGENCY, WEST JAVA, INDONESIA Ngurah N Wiadnyana 1 and Adriani Sri Nastiti 2 1 Research and Development Center for Marine and Fisheries Technology. 2 Research Institue for Fisheries Resource Enhancement and Conservation. Keywords: green turtle, conservation, socio-economy, coastal community, Pangumbahan Beach Located between Ujung Genteng and Pangumbahan Villages, Sukabumi Regency at 7o19'10" to 7o19'50" latitude and 106o23'00" to 106o24'10" longitude, Pangumbahan Beach has been pointed as Coastal Park for turtles conservation in West Java Province, Indonesia. The beach is suitable for the nesting of green turtle (Chelonia mydas). The status of Pangumbahan Beach is designated as a coastal park under the low of a decree of Sukabumi Regent No: 523/Kep.639-Dislutkan/2008. Since that time an increase in the number of visitor is recorded from 2008 to 2012 with number of people varying 13,176 to 21,759. This tourism activity seems give positive benefits to the real economic for coastal community around the park. The rise of the economic activities growing occurs in various business fields including: transportation, lodging, restaurants, trade and tourist guides. The income of people before the existing of ecotourism activities has been low compared to present condition. The awareness of local people is significantly high to participate in developing turtle conservation in the area. This would give a good prospect to enhancing sea turtle population in Indonesia, especially in West Java. ngurah_prpt@indo.net.id 22

27 015 DIFFERENCE IN FLIPPER BEATING FREQUENCY OF GREEN TUTRLES IN WATER AND ON LAND Hideaki Nishizawa 1, Junichi Okuyama 1, 2, Tohya Yasuda 1, 3, Nobuaki Arai 1 and Masato Kobayashi 4 1 Graduate School of Informatics, Kyoto University 2 Present Address: NMFS/NOAA 3 Present Address: Seikai National Fisheries Research Institute, Fisheries Research Agency, 4 Research Center for Subtropical Fisheries, Seikai National Fisheries Research Institute, Fisheries Research Agency Keywords: sea turtles, flipper beating, frequency, aquatic, terrestrial For tetrapods undergoing transitions between aquatic and terrestrial environments, the limb cycle is an important property for producing thrust in both environments. In previous studies of amphibious animals performing drag-based swimming, limb cycle frequency was reported to be higher during aquatic than terrestrial locomotion or similar in both types of locomotion. However, comparison of the limb cycle of animals performing effective lift-based swimming between in water and on land has been less studied. Green turtle (Chelonia mydas) is known to use similar gait of synchronous movement of foreflippers in both aquatic and terrestrial environments and to perform lift-based swimming. Here we compared the flipper beat frequency of green turtles between in water and on land. For lift-based swimming, dorsoventral excursion mainly produces thrust, whereas anteroposterior excursion of limbs contributes to thrust production for drag-based swimming and terrestrial crawling. Therefore, if lift-based swimming animals have some restrictions on anteroposterior excursion for aquatic adaptation, their terrestrial crawling will be constrained. This study will produce some implications for aquatic adaptation to migration and trade-off between swimming and crawling. nishizawa@bre.soc.i.kyoto-u.ac.jp 23

28 016 WHEN DO GREEN TURTLES MOVE UP TO THE SHALLOW WATERS? A REVIEW OF FORGING TRIP OF GREEN TURTLES (CHELONIA MYDAS) TO SEAGRASS MEADOWS Junichi Okuyama 1 and Nobuaki Arai 2 1 Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 2 Graduate School of Informatics, Kyoto University Keywords: Chelonia mydas, feeding ecology, herbivore, s One of the major threats for endangered sea turtles is by-catch in fisheries. For green turtles (Chelonia mydas) being herbivore and ranging throughout tropical and subtropical waters worldwide, gill net and set (pound) net fisheries in shallow area cause high mortality. To effectively manage the conservation measure for green turtles, therefore, it is necessary to understand why they move up to shallow area and how long period they stay there. Previous studies on behavior and ecology of green turtles indicate that the primary reason of moving up to shallow area would be foraging trip to seagrass meadows. Here we review the previous studies on foraging trip including our studies and present a hypothesis that the time period of staying in shallow area may be regulated by the capacity of gut contents, because they are able to concentrate on feeing due to no need of capture effort for preys and low risk of predation. However, it should be noted that this hypothesis cannot be applied for green turtles that main food source is not seagrass, but patch algae and invertebrates. okuyamajunichi@gmail.com 24

29 017 THE JORDAN S NATIONAL ACTION PLAN (NAP); AN APPROACH TO IDENTIFY AND PRIORITISE A SET OF ACTIONS RELATED TO THE CONSERVATION OF MARINE TURTLES AND THEIR HABITATS IN GULF OF AQABA, RED SEA Mohammad K. Al-Zibdah The University of Jordan Key words: Marine turtles, Action plan, Jordan, Gulf of Aqaba The Jordan s national action plan (NAP) provides a set of priority actions for the conservation of marine turtles and their habitats in the Gulf of Aqaba. All species of marine turtle have been classified as endangered and are listed by CITES in Appendix I. Being part of the Red Sea, our region supports globally important feeding and nesting grounds for populations of green, hawksbill and loggerhead turtles. The main threats to the maintenance of stable turtle populations are now well understood. For Jordan, it range from opportunistic capture to global threats such fishing mortality and threats from pollution incidents. This NAP addresses the primary causes of turtle mortality with a series of proposed actions. Actions include; a) reducing threats to turtle populations from commercial fisheries, land development operations, and human interference, b) regulating direct capture in turtles and c) promoting turtle rescue and rehabilitation along with public awareness activities. It is recognised however that reducing the threats to marine turtle populations alone will be insufficient to guarantee their survival. Hence NAP has considered a further set of recommendations. It include the importance of protecting turtle feeding habitat, research and monitoring, community participation in conservation activities, the capacity of national agencies to carry out the necessary management activities and to enforce legislation. An extensive reference list was supplemented with suggested additional titles and a set of useful appendices. For each of the national priority actions identified, expected results and performance indicators were defined. Designation of a level of urgency to each specific priority action allowed a phased approach to implementation, subject to budget and available national capacity. The NAP implementation was occurred through integrated networks of national and local working groups, government departments, agencies and personnel, non-governmental organisations and other stakeholders with the aim of assisting effective execution. mzibdah@yahoo.com, zibdeh@ju.edu.jo, P.O Box 105, Aqaba-Jordan 25

30 018 COMMUNITY - BASED PROTECTION, CONSERVATION AND SOME BIO- ECOLOGICAL NOTES OF SEA TURTLES IN DAHICAN BEACH, MATI CITY, PHILIPPINES Lea AngSinco-Jimenez 1, Sherwin Edgar B. Atoy 2, Bernadette J. Nanual 1 and George J. Plaza 3 1 Regional Integrated Coastal Resource Management Center (RIC XI), Davao Oriental State College of Science and Technology 2 Independent researcher/civilian Volunteer 3 Community partner in sea turtle conservation, Dahican Beach Resident Keywords: sea turtle protection and conservation, community-based, bio- ecological notes, Dahican Beach Local efforts of young surfers in Dahican beach for the protection and conservation of sea turtles has prompted this report to document their community-based conservation strategy and practices. Actual documentation with the locals accounted 5 species of sea turtles (Olive Ridley (Lepidochelys olivacea), green sea (Chelonia mydas), hawksbill (Eretmochelys imbricata), loggerhead (Caretta caretta) and leatherback (Dermochelys coriasea) which visit or nest along the shores of the municipality. However, only 3 species (green, olive ridley and hawksbill) are the regular nesters in Dahican beach. It was established that the nesting season in the area starts in the month of March up to the month of September. The nesting status of 54 green sea turtles, 52 olive ridleys and 5 hawksbills from as well as conservation efforts was monitored and recorded. Turtles as by-catch of fishery-related activities for 3 years recorded 22 green sea turtles, 24 olive ridleys, 13 hawksbills, and have been turned over by local people from Brgy. Dahican. Various sizes of these by-catches have curved carapace width ranges 18-85cm. and length measurement ranges cm. The Regional ICRM Center (RIC XI-DOSCST) as a partner agency extends technical assistance to the said youth organization in Dahican beach. These data are empirical for the support in monitoring and management of the resources which can be used for the integrated ecotourism industry and sustainable livelihood of the coastal community. liyajim@yahoo.com 26

31 019 VULNERABILITY ASSESSMENT OF MARINE TURTLES TO SEA LEVEL RISE Lucero, Matias J. 1, Saturnino C. Parcasio, Jr. 1, Peter Y. Labis 1, Ruth S. Lucero 2 and Helen W. Noel 2 1 LGU-OMAF, Malita, Davao del Sur SPAMAST, Malita, Davao del Sur 8012 The study focused on the impacts of sea-level rise due to climate change on the nesting of marine turtle (pawikan) carried out in the coastal part of Malita. Specifically, it aimed to gather preliminary data on the nesting sites of marine turtles with reference to the lowest low tide mark, as well as quantify impacts of sea level rise. The information derived from this study can contribute in building awareness to promote the conservation and management of marine turtles and in crafting policies of a particular coastal area utilized as nesting sites of turtles. Data on nesting and nesting sites were considered for comparison between and among species. Nesting sites with reference to the lowest low tide mark were determined through GPS and transect tape. Thirty key informants interviewed provided information on coastal structures and utilization. Results showed that four species of marine turtles nested in the 3 kilometer coastline stretch. There was an observed change in the size of the nesting areas. It has been reduced by approximately 47% in the last 4 decades. The rise in the sea level has affected the hatching success and survival of the hatchlings. Signs of salt water intrusion further inwards to the land approximately 500 meters were apparent. mjlucero59@yahoo.com 27

32

33 ABSTRACT (Poster) 29

34

35 P001 BEHAVIOR ANALYSIS OF PACIFIC BLUEFIN TUNA (THUNNUS ORIENTALIS) USING GYTOSCOPE DATA LOGGER Masakazu Ishikawa 1, Takuji Noda 1, Hiromichi Mitamura 1, Ko Fujioka 2, Hiromu Fukuda 2 and Nobuaki Arai 1 1 Graduate School of Informatics, Kyoto University 2National Research Institute of far Seas Fisheries, Fisheries Research Agency Keywords: Pacific bluefin tuna, gyroscope data logger, schooling, energy strategy Fishes perform various movements for survival. For this reason, measuring movements is necessary for understanding their energy strategies or survival strategies. Until recently, it has been difficult to measure movements of free-ranging fish in the field. In this study, by using the newly developed micro data logger (dimension: 30mm 12mm 12mm, weight: 7g in air) with 3 axis acceleration and 3 axis gyroscope sensors, detailed 3 dimensional movements of yearling bluefin tuna (N=16,24.7±2.0cm) were grasped in high frequency (200 Hz). By measuring detailed acceleration and angular velocity of movements, we clarified gliding and schooling swimming that are related to efficient swimming. Movements of the schooling of bluefin tuna were compared between day and night. The result indicated that (1) the duration of glide in night was longer than daytime and (2) timing of gliding was synchronized among individuals. These results lead to the knowledge about an energy strategy. ishikawa@bre.soc.i.kyoto-u.ac.jp 31

36 P002 DEVELOPMENT OF A FINE-SCALE ACOUSTIC POSISIONING AND TELEMETRY SYSTEM FOR SCHOOLING BEHAVIOR OF BLUEFIN TUNA Kazunori Kikuchi 1, Kotaro Ichikawa 2, Ko Fujioka 3, Hiromu Fukuda 3, Hiromichi Mitamura 1 and Nobuaki Arai 1 1 Graduate School of Informatics, Kyoto University 2 Research Institute for Humanity and Nature National Institutes for the Humanities 3 National Research Institute of Far Seas Fisheries Keywords: schooling behavior, Bluefin tuna, biotelemetry, acoustic positioning, ultrasonic transmitter Bluefin tuna (Thunnus orientalis) is popular and highly valuable fish. Recently, decline of Bluefin tuna has been an imperative problem. For sustainable resource use, it is important to clarify their basic ecology. Bluefin tuna engage in schooling during a part or the whole of their life. However, many studies about schooling behavior of fish have been mainly carried out in the observation room (or laboratory environment) so far because it is difficult to observe the schooling behavior in the outdoors. Recent improvements in biotelemetry, enable to measure the positioning of the target animals with high accuracy in the outdoors. In this study, we conducted the preliminary study to measure the schooling behavior of juvenile Bluefin tuna in the outdoor fish pen using a new fin-scale acoustic positioning biotelemetry system, AUSOMS ver.3.0 (AquaSound Inc., Kyoto, Japan). 8 Bluefin tuna 25-27cm FL were tagged with ultrasonic transmitters (V9P, Vemco, Canada) in their peritoneal cavity, which represent the swimming depth by acoustic signal intervals. We set three AUSOMSs in the fish pen (26x26m) and carried out positioning about 1 second interval of each individual. The result of positioning accuracy showed that the measurement of the average error was 32.1cm, standard deviation was 40.0cm, and the mode was 9.8cm. From this result, it was found that the detailed location information obtained using AUSOMS in the outdoors. The next step of our study is to carry out the horizontal and vertical accurate positioning of the fish. kikuchi@bre.soc.i.kyoto-u.ac.jp 32

37 P003 DEVELOPMENT AND EVALUATION OF ULTRASONIC TRANSMITTER USING FREQUENCY MODULATION FOR BIOTELEMETRY Masahiro Nakagawa 1, Kotaro Ichikawa 2, Toyoki Sasakura 3, Hiromichi Mitamura 1 and Nobuaki Arai 1 1 Graduate School of Informatics, Kyoto University 2 Research Institute for Humanity and Nature National Institutes for the Humanities 3 Aquasounde Inc. Keywords: biotelemetry, ultrasonic transmitter, frequency modulation Biotelemetry is widely used to identify the position information of aquatic animals. The conventional biotelemetry in water has a limit to the positioning accuracy. Specifically, there are positioning errors, which are caused by ambient noise. The purpose of this study is to develop a new type of ultrasonic transmitter using frequency modulation (FM pinger) to reduce the positioning errors of biotelemetry caused by ambient noise. In the field of acoustic localization, it is known that frequency modulation is robust against noise. However, the conventional biotelemetry uses single frequency transmitter. In this study, we developed the FM pinger and conducted experiments to compare the positioning accuracy of biotelemetry by FM pinger and conventional single-frequency pinger in an experimental tank. We tested 6 patterns of frequency modulation bandwidth including single frequency (0, 2, 4, 6, 8, 10 khz) with two kinds of duration (2, 10 msec.) for each frequency modulation bandwidth. As results, the rate of the accurate result of positioning of the one pattern, frequency modulation bandwidth: 0 khz and duration: 2 ms, was 5.0 % and the rate of false alarms was 15.0 %. The rate of the accurate result of positioning of another, frequency modulation bandwidth: 2 khz and duration: 2 ms, was 16.7 % and the rate of false alarms was 0.0 %. From these results, it was considered that there were reverberations because the tank was too small and the reverberation affected the detection performance. The next logical step of this study is to conduct another experiment in the open sea. nakagawa@bre.soc.i.kyoto-u.ac.jp 33

38 P004 ENVIRONMENTAL IMPACT ASSESSMENT OF THE HUTGYI HYDROPOWER PROJECT IN THAILAND: ENVIRONMENTAL ASPECTS AND FISH MIGRATION S. Chavanich 1, S. Piyateratitiworakul 1, N. Arai 2, S. Piyapattanakorn 1, C. Nitithamyong 1, V. Viyakarn 1, 3, P. Somgpongchaiyakul 1, P. Singhruck 1, J. kettratad 1, S. Chanchungjit 1, J. Sirirat 1 and T. Sriburi 3 1 Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 2 Graduate School of Informatics, Kyoto University 3 Chula Unisearch, Chulalongkorn University The Ministry of Energy, Thailand and the Department of Hydropower, Myanmar have signed a Minute of Agreement (MOA) to develop a hydropower project on the Thanlwin (Salween) and Tanintharyi River basins. Based on the scope and responsibilities outlined by the Myanmar Thai Joint Cooperation Committee (JCC), Electricity Generating Authority of Thailand (EGAT) has to handle the project feasibility study, and environmental impact assessment must be conducted to support the project. In this study, we investigate both physical and biological components in the river basin. These include water current direction and physio-chemical components. In addition, diversity of phytoplanktons, zooplanktons, invertebrates, and fish are also investigated. In order to determine the possible impact of the hydropower project on fish migration, fish telemetry will also be used. From the preliminary study, some species of fish have migrations to up and down stream for their growth, spawning, and habitat. Thus, Hemibagrus micropthalmus (Day, 1889), Rita sacerdotum Anderson, 1878, and Sperata acicularis Ferraris, 1999 will be chosen for fish tracking. The data will allow us to determine the installation of fishway at Hutgyi dam to service fish in either upstream or downstream. More details of the project will be discussed. suchana.c@chula.ac.th 34

39 P005 THE EVALUATION OF VPS SYSTEM FOR MEASURING FINE-SCALE MOVEMENT OF SNOW CRAB IN DEEP SEA AREA Hiroaki Yamoto 1, Nao Yoshida1, Kazuki Kanawa 1, Hiromichi Mitamura 1, Tetsuya Ohtani 2, Tameo Ozaki 2 and Nobuaki Arai 1 1 Graduate School of Informatics, Kyoto University 2 Tajima Fishers Technology Center, Hyogo, Keyword: Chionoecetes opilio, VR2W Positioning System, deep sea area Snow crabs (Chionoecetes opilio) are important resource in Northern Hyogo, Japan. However, a haul of them are decreasing because of excessive fishing. People in Northern Hyogo took some management for increasing the haul, but the effects have been unclear. For taking effective management, we need to know about snow crab s ecology in the field. One of the powerful methods to study marine organisms is acoustic telemetry. To know the fine-scale movement living of snow crab, we used a novel telemetry system, VR2W Positioning System (VPS) estimate fine-scale movement data at the resolution of a few meters. The algorithm is based on the 3-receiver time difference of arrival algorithm. VPS is a high-precision, cheap, and reliable method. However, this method has not been used in deep sea yet (deeper than 200 meters). The objective of our study is to evaluate VPS system for measuring the movement of snow crabs in the deep sea area. We put 7 VR2W receivers (Vemco, Canada) in the sea of Northern Hyogo, building a hexagon. We released 28 snow crabs (male: 5 133mm±12mm body length, female: 23 84mm±12mm body length) which were attached V9AP transmitters (Vemco, Canada) on their back in October. In November and December, we put additional VR2W receivers around VPS for about 40 minutes to track the tagged crabs left from VPS area. As a result, we could confirm 23 and 22 signals of crabs in each crab. There were more snow crabs in the South of VPS than North. For 2 months after release, we retrieved receivers. We could get a lot of activity data and the movement pathway of snow crabs. We succeeded to develop the method to measure fine-scale positioning of the snow crab in deep sea area. h-yamoto@bre.soc.i.kyoto-u.ac.jp 35