trawl – gear description (fish & shrimp) · 2013. 2. 18. · references eayrs, s. 2007.a...
TRANSCRIPT
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INSERT INSTRUCTOR Name
Trawl – Gear description (fish & shrimp)
http://www.safmc.net
Joël Prado - FAO/FIIT http://www.whboat.com
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Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic)
http://www.ilvo.vlaanderen.be http://www.seafish.org
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Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) ~ 50% global catch
Watson et al. 2004
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Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) 50% global catch Active Cone-shaped net
http://www.montereybayaquarium.org
http://research.usm.maine.edu/
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Introduction Fish & invertebrates Bottom (demersal) and midwater (pelagic) 50% global catch Active using cone-shaped net Small & large vessels
NOAA Fisheries http://www.crenvironmental.com/NOAAtrawl.htm
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Introduction - Impacts Bycatch Juvenile fish in shrimp trawl Protected species
Bottom habitat
Shrimp fishing bycatch (Madagascar) http://www.ird.fr/
Before (top) & after (bottom) trawling. FAO 2005
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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
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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
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Trawl configurations Varies by target & fish behavior Beam trawl /otter trawl / pair trawl
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Trawl configurations Varies by target & fish behavior
Beam trawl /otter trawl / pair trawl
http://www.scotland.gov.uk/
http://www.qc.dfo-mpo.gc.ca/ Griffiths: http://www.sanctuarysimon.org/
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Trawl configurations Varies by target & fish behavior
Beam trawl /otter trawl (animation from http://www.dantrawl.com) / pair trawl
http://www.liv.ac.uk/
http://www.crimond.com/bison.htm
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Trawl configurations Varies by target & fish behavior
Beam trawl/otter trawl/ pair trawl(2 vessels)
Photos: http://www.boatdesign.net/forums/open-discussion/beam-trawl-query-17413.html
http://www.nfrdi.re.kr http://news.bbc.co.uk
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Trawl configurations
Images modified from FAO (2001b),Lokkeborg (2005) and http://www.crimond.com
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http://www.crimond.com/
Trawl configurations Confusing terminology (#1)
Pair trawl – 2 vessels
Twin trawl – 2 nets
Duplex (separator) trawl –
2 codends
http://www.nfrdi.re.kr
http://www.crimond.com/
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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; http://www.ilvo.vlaanderen.be
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Net components (Manual Fig.6-2)
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Net components (Manual Fig.6-3)
Sack
Headline
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Net configuration
Fisheye BRD
Tie off rings
TED (hard grid)
Elephant ears
Headrope / headline
Lazy line
Footrope
Dummy door Trawl door
Tickler chain
Bottom leg Top leg
Floats
Guide line
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Gear Deployment & Retrieval Video - retrieving
NOAA Fisheries
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Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED) Turtle excluder device (TED)
NOAA Fisheries http://www.gbrmpa.gov.au
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Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED)
NOAA Fisheries
Fish eye (http://www.seagrantfish.lsu.edu)
Square mesh window (FAO)
Square mesh codend
(http://bayjournal.com.au)
Radial escape section (http://www.seagrantfish.lsu.edu)
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Bycatch reduction Bycatch reduction device (BRD) Junk fish excluder (JTED) Turtle excluder (TED video)
w
NOAA Fisheries Photo: Mike Gerner, AFMA
http://www.euroturtle.org
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Bycatch reduction
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Trawl sensors
http://www.notus.ca/
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1
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Gear Description - Finfish
X
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http://dnr.louisiana.gov/
http://www.crimond.com/
http://www.net-sys.com/
www.morgere.fr/
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Gear Description - Finfish
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Gear Description - Finfish
Headline
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Gear Description - Finfish
http://www.eurorock-belgium.com
http://www.cosmostrawl.dk
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Gear Description - Finfish
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http://www.fao.org/
Courtesy of S. Sei, Sierra Leone)
StretchedMeshOpening -Diamond Mesh
StretchedMeshOpening -Diamond Mesh
StretchedMeshOpening -Diamond Mesh
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Gear Description - Finfish
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Gear Description - Finfish
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Gear Description - Finfish
Fish eye (http://www.seagrantfish.lsu.edu) Images from Eayrs (2007)
x
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Gear Description - Finfish
x
Radial Escape Section(http://www.seagrantfish.lsu.edu) Images from Eayrs (2007)
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Gear Description - Finfish X Images from Eayrs (2007)
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Gear Description - Shrimp
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Gear Description - Shrimp
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Gear Description - Shrimp
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Gear Description - Shrimp
Grid angle
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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.
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FS345 LIB 9997 7 x
1 x
x Crimond nova demersal
2.4 2.0 1000
4.03 1.2 chain 3. 5 1.2 chain 4.2 1.2 chain 6 20 wire cable 7.2 15 wire cable 6 15 wire cable
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Length = 2.4 m
Hei
ght =
2 m
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Gear Description - Finfish
400 25 steel cable
52 20 nylon 18 60 22 weighted synthetic 11 60 Dyneema 65 10 chain (sttel) 100kg
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Gear Description - Finfish
8 25 rubber 15 15 10 rubber 32
Polyethelene 3.5 15.0 25 100 Polyethelene 3.5 12.0 30 65
Polyethelene 3.5 8.25 W 110 76
x
x
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Summary Can you name the trawl configurations below
Beam trawl / otter trawl / pair trawl
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Summary
1
1
2
3
3
4
4
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Summary
Describe how trawl gear works
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References Eayrs, S. 2007. A Guide to Bycatch Reduction in Tropical Shrimp-Trawl
Fisheries. Revised edition. Rome, FAO. 108 p. Kelleher, K. 2005. 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.
2004. Fishing Gear Associated With Global Marine Catches. Fisheries Centre Research Reports 12.