Catch efficiency of a small-sized Danish seine
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1 Background Catch efficiency of a small-sized Danish seine Orio Yamamura (Hokkaido National Fisheries Research Institute, FRA) DoCoFis: Comprehensive projects to understand population dynamics of commercially important stocks Focusing on recruitment processes of walleye pollock Predation impact on post-settlement juvenile walleye pollock in the the coastal area, where fishing gears are densely deployed otter trawling is excluded
2 Small-sized Danish seine Originally used for shishamo smelt ( fishery Consists of a barrel, a pair of herding ropes and a net Handy, easily operated Suitable for fish collection in the coastal area Fishing efficiency has been still unknown
3 Danish seine operation 1. Let the barrel go
4 Danish seine operation 1. Let the barrel go 2. After running 2/3 length of the rope, turn and let the net go
5 Danish seine operation: Cont d 1. Let the barrel go 2. After running 2/3 length of a rope, turn and let the net go 3. Return to the barrel
6 Danish seine operation: Cont d 1. Let the barrel go 2. After running 2/3 length of the rope, turn and let the net go 3. Return to the barrel 4. Retrieve the barrel 5. Hold for a while to let the ropes sink
7 Danish seine operation: Cont d 1. Let the barrel go 2. After running 2/3 length of the rope, turn and let the net go 3. Return to the barrel 4. Retrieve the barrel 5. Hold for a while to let the ropes sink 6. Go ahead slowly, wind up the ropes, sweep and herd fish
8 Danish seine operation: Cont d 1. Let the barrel go 2. After running 2/3 length of the rope, turn and let the net go 3. Return to the barrel 4. Retrieve the barrel 5. Hold for a while to let the ropes sink 6. Wind up the ropes, sweep and herd fish 7. Retrieve the net
9 Purpose of the present study To obtain catch efficiency of the Danish seine to quantify the coastal predator of post-settlement juvenile walleye pollock, by comparing with catches of otter trawling
10 Survey design 6 Otter trawling FRV Hokko-maru (HNFRI: 92t) Oct 3 ~ Nov. 1 6 tows (6m x 3, 9m x 3) Wingspread Danish seine FMV Yutaka (Kushiro City Fish Coop: 7t) Oct 24 & Nov 16 8 tows (6m x 4, 9m x4) 7 Otter trawling Hokko-maru Sep. 3~6 8 tows (6m x 4, 9m x 4) Danish seine Yutaka Aug 24 & Sep 11~12 9 tows (6m x 4, 9m x5) DS OT 7 6 6m 6m 9m 9m
11 Survey design Measurement of area sampled by the nets Otter trawling SCAMMER sensor Attached to the doors Wing spread was estimated by: y = b a + b x Danish seine The area surrounded by the herding ropes Approximated by digitizing GPS track of the vesse wing spread y x a Data comparison Used gravimetric density b
12 6 Catch composition Species compared for catch Plain sculpin Myoxocephalus jaok Horned sculpin Enophrys diceraus Kamchatka flounder Atheresthes evermanni Blackfin flounder Glyptocephalus stelleri BT 6m BT 9m DS 6m DS 9m 1
13 Density comparison (6) Species compared for catch Plain sculpin Myoxocephalus jaok Horned sculpin Enophrys diceraus Kamchatka flounder Atheresthes evermanni Blackfin flounder Glyptocephalus stelleri Apparent catch efficiency of Danish seine for sculpins Average: 37.1 Average density within the herding rope (t/km2) 6m 9m Plain sculpin.16.3 Horned sculpin.5.4 Kamchatka flounder.1.2 Blackfin flounder.1.3 Ave. density estimated by otter trawling!t/km 2 ) 6" 9! Plain sculpin Horned sculpin Kamchatka flounder Blackfin flounder OT / DS ratio 6m 9m Plain sculpin Horned sculpin Kamchatka flounder Blackfin flounder Average: 69.3 =. 7 Apparent catch efficiency of Danish seine for sculpins
14 Catch composition 7 Anomalous thermal condition Sporadic occurrence of fishes except for Plain sculpin Comparison was possible only for plain sculpin BT 6m BT 9m Fish density ( t km 2 ) 6m 9m DS.15±.4.38±.9 OT 3.45± ±7.27 DS - OT ratio 1: : DS 6m DS 9m Ave =
15 Comparison of fish size Plain sculpin caught in 6m and 9m strata (6) Significant difference in 6m N.S. in 9m OT catches rather large-sized fish Complete comparison is still needed (Mean LFD from all Stns. weighted by catch ) Plain sculpin: 6m P< N.S. Plain sculpin: 9m
16 Catch composition 7 Anomalous thermal condition Sporadic occurrence of fishes except for Plain sculpin Comparison was possible only for plain sculpin BT 6m BT 9m Fish density ( t km 2 ) 6m 9m DS.15±.4.38±.9 OT 3.45± ±7.27 DS - OT ratio 1: : DS 6m DS 9m Ave =
17 Conclusion Density estimate was compared for an otter trawling net and Danish seine The density of fish within the area swept by OT was: 36 times higher for sculpins 7 times higher for flatfishes, comapred with DS These factors are used for density estimate by DS, assuming the catch efficiency of OT (q OT ) to be 1. However, q OT is fairly below 1., so the density estimate by DS would be still conservative q OT is still needed for more precise density estimate!
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