Trawl Gear description (fish & shrimp)
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1 Trawl Gear description (fish & shrimp) INSERT INSTRUCTOR Name Joël Prado - FAO/FIIT
2 Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic)
3 Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) ~ 50% global catch Watson et al. 2004
4 Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) 50% global catch Active Cone-shaped net
5 Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) 50% global catch Active using cone-shaped net Small & large vessels NOAA Fisheries
6 Introduction - Impacts Bycatch Juvenile fish in shrimp trawl Protected species Bottom habitat Shrimp fishing bycatch (Madagascar) Before (top) & after (bottom) trawling. FAO 2005
7 Objectives Describe how trawl gear works List 4 components of a trawl and describe 2 pieces of specialized equipment Demonstrate ability to complete the gear description form
8 Sampling Priorities 1. Collect information on fishing effort 2. Randomly sample catch for catch composition 3. Record gear characteristics 4. Collect length-frequency data on target and non-target catch
9 Trawl configurations Varies by target & fish behavior Beam trawl /otter trawl / pair trawl
10 Trawl configurations Varies by target & fish behavior Beam trawl /otter trawl / pair trawl Griffiths:
11 Trawl configurations Varies by target & fish behavior Beam trawl /otter trawl (animation from / pair trawl
12 Trawl configurations Varies by target & fish behavior Beam trawl/otter trawl/ pair trawl(2 vessels) Photos:
13 Trawl configurations Images modified from FAO (2001b),Lokkeborg (2005) and
14 Trawl configurations Confusing terminology (#1) Pair trawl 2 vessels Twin trawl 2 nets Duplex (separator) trawl 2 codends
15 Trawl configurations Confusing terminology (#2) Beam trawler vessels which deploy nets from abeam; also outrigger trawler or winch boat Beam trawl type of net Beam trawler with beam trawls;
16 Net components (Manual Fig.6-2)
17 Net components (Manual Fig.6-3) Headline Sack
18 Net configuration Trawl door Dummy door Bottom leg Top leg Tickler chain Footrope TED (hard grid) Fisheye BRD Floats Guide line Headrope / headline Elephant ears Lazy line Tie off rings
19 Gear Deployment & Retrieval Video - retrieving NOAA Fisheries
20 Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED) Turtle excluder device (TED) NOAA Fisheries
21 Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED) Fish eye ( Square mesh window (FAO) Radial escape section ( Square mesh codend ( com.au) NOAA Fisheries
22 Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED) Turtle excluder (TED video) w Photo: Mike Gerner, AFMA NOAA Fisheries
23 Bycatch reduction
24 Trawl sensors
25 1
26 Gear Description - Finfish X
27
28 Gear Description - Finfish
29 Gear Description - Finfish Headline
30 Gear Description - Finfish
31 Gear Description - Finfish
32 Courtesy of S. Sei, Sierra Leone) Stretched Mesh Opening - Diamond Mesh
33 Gear Description - Finfish
34 Gear Description - Finfish
35 Gear Description - Finfish x Fish eye ( Images from Eayrs (2007)
36 Gear Description - Finfish x Images from Eayrs (2007) Radial Escape Section(
37 Gear Description - Finfish X Images from Eayrs (2007)
38
39 Gear Description - Shrimp
40 Gear Description - Shrimp
41 Gear Description - Shrimp
42 Gear Description - Shrimp Grid angle
43 Activity Handout Groups of 2 or 3 20 minutes *use mini net in front of room for your codend mesh size. Record your measurements and average mesh size calculation.
44 FS345 LIB x x 1 x Crimond nova demersal chain chain chain 6 20 wire cable wire cable 6 15 wire cable
45 Height = 2 m Length = 2.4 m
46 Gear Description - Finfish steel cable nylon weighted synthetic Dyneema chain (sttel) 100kg
47 Gear Description - Finfish 8 25 rubber rubber 32 Polyethelene Polyethelene Polyethelene W x x
48 Summary Can you name the trawl configurations below Beam trawl / otter trawl / pair trawl
49 Summary
50 Summary Describe how trawl gear works
51 References Eayrs, S A Guide to Bycatch Reduction in Tropical Shrimp-Trawl Fisheries. Revised edition. Rome, FAO. 108 p. Kelleher, K Discards in the world's marine fisheries: An update. FAO Fisheries Technical Paper, FAO, Rome. Watson, R., E. Hoshino, J. Beblow, C. Revenga, Y. Kura, and A. Kitchingman Fishing Gear Associated With Global Marine Catches. Fisheries Centre Research Reports 12.
Introduction. Trawl Gear description (fish & shrimp) Introduction. Introduction 4/4/2011. Fish & invertebrates
Trawl Gear description (fish & shrimp) Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) INSERT INSTRUCTOR Name http://www.safmc.net http://www.ilvo.vlaanderen.be http://www.seafish.org
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