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2009-2010 Sweep Efficiency Studies: Update

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2009-2010 Sweep Efficiency Studies: Update 2009-2010 sweep efficiency studies: update Northeast Fisheries Science Center January 16, 2018 Study 2009 Twin-trawl 2009-10 Paired trawl F/V Mary K Vessel(s) F/V Karen Elizabeth F/V Moragh K F/V Endurance Trawl type Twin Paired Net 3 bridle, 4-seam standard survey bottom trawl Sweeps Rockhopper sweep, Cookie sweep (3” discs) Restrictor Yes No cables To ws Standard NEFSC survey tows (20 min, 3 knots) Season(s) Fall Spring and Fall Southern New England, Region(s) Southern New England Georges Bank, Gulf of Maine Target spp Flatfish, skates, monkfish Status of work 2009 Twin-trawl study Analysis: Calculation of catch ratios – COMPLETE Sweep relative efficiency – not conducted Report: Draft report - COMPLETE 2009-2010 Paired trawl study Analysis: Calculation of catch ratios – COMPLETE Sweep relative efficiency - COMPLETE Report: Draft report - COMPLETE Number of paired tows 2009 Twin-trawl study SNE 2009 Fall Total 100 In analysis 86 Day 47 Night 39 2009-2010 Paired trawl study SNE GB GOM 2010 2009 2010 2010 2010 2010 Spring Fall Spring Fall Spring Fall Total Total 85 61 66 65 92 63 432 In analysis 78 51 61 54 71 55 370 Day 46 29 34 25 42 25 201 Night 32 22 27 29 29 30 169 Tow locations 2009 Twin-trawls 2009-2010 Paired trawls Catch and catch ratios 2009 Twin-trawl study 10 species caught: • Primarily little skate, winter skate • Winter flounder and yellowtail were most prominent flatfish caught Generally larger catch with cookie sweep • Most catch ratios (cookie/rockhopper) > 1.00 • Precision (CV) variable • Apparent day/night effect for several species Catch and catch ratios 2009 Twin-trawl study Southern New England FALL Day Night Weight Number Weight Number Winter skate 2.25 (0.51) 4.01 (0.58) 3.62 (1.19) 4.60 (1.15) Little skate 3.78 (0.65) 4.17 (0.71) 2.23 (0.81) 2.40 (0.83) Summer flounder 2.04 (1.39) 1.77 (0.67) 0.92 (0.61) 0.76 (0.37) Yellowtail flounder 2.45 (0.85) 2.55 (0.90) 1.11 (0.25) 1.12 (0.23) Winter flounder 1.39 (0.30) 1.45 (0.31) 1.06 (0.43) 1.11 (0.46) Windowpane flounder 4.65 (0.51) 5.08 (0.55) 1.56 (.) 1.49 (.) Monkfish 4.36 (1.79) 1.77 (0.75) 4.56 (2.68) 1.74 (0.85) C/R Average ratios (with) CVs in parenthesis Catch and catch ratios 2009-2010 Paired trawl study 29 species caught, primarily: SNE GB GOM Witch flounder Summer flounder Spring Yellowtail Winter skate Fourspot flounder Yellowtail Yellowtail Fall Winter flounder Yellowtail American plaice Generally larger catch with cookie sweep • Most catch ratios (cookie/rockhopper) > 1.00 • Precision (CV) variable • Apparent day/night effect for several species 2009-2010 Paired SPRING Day Night SNE Weight Number Weight Number Winter skate 3.51 (1.07) 3.69 (0.89) 1.69 (0.83) 1.63 (0.89) Little skate 10.20 (0.72) 9.30 (0.75) 1.37 (0.24) 1.35 (0.31) Summer flounder 2.31 (0.97) 2.26 (0.72) 1.21 (0.59) 1.22 (0.38) Fourspot flounder 3.02 (0.64) 3.37 (0.76) 1.40 (0.29) 1.57 (0.43) Yellowtail flounder 2.75 (0.99) 2.36 (0.96) 1.94 (0.79) 1.79 (0.45) Winter flounder 1.83 (0.37) 1.76 (0.36) 2.42 (1.48) 1.87 (1.06) Windowpane flounder 4.41 (0.64) 4.58 (0.67) 5.32 (2.22) 3.00 (1.53) Monkfish 1.86 (1.20) 1.54 (0.89) 1.75 (1.14) 1.45 (0.52) FALL Winter skate 9.55 (.) 14.00 (.) 2.02 (.) 3.67 (.) Little skate 11.95 (0.91) 12.91 (0.84) 3.47 (.) 4.33 (.) Summer flounder 1.58 (0.49) 1.55 (0.53) 1.73 (0.82) 1.37 (0.29) Fourspot flounder 6.11 (1.06) 6.36 (0.89) 1.94 (0.60) 2.00 (0.64) Yellowtail flounder 3.75 (0.75) 3.14 (0.61) 2.10 (0.48) 2.22 (0.50) Winter flounder 2.12 (0.54) 2.22 (0.54) 1.49 (0.41) 1.47 (0.51) Windowpane flounder 6.65 (0.70) 6.81 (0.58) 1.6 (0.54) 1.83 (0.42) Monkfish 2.21 (0.41) 1.83 (0.90) 4.99 (1.42) 1.58 (0.82) C/R Average ratios (with) CVs in parenthesis 2009-2010 Paired SPRING Day Night GB Weight Number Weight Number Winter skate - - 5.64 (.) 8.50 (.) Summer flounder 5.72 (1.88) 3.83 (1.23) 1.30 (0.58) 1.19 (0.57) Fourspot flounder 4.81 (1.07) 4.75 (0.88) 3.37 (0.57) 3.27 (0.55) Yellowtail flounder 5.01 (1.81) 4.32 (1.46) 1.93 (0.74) 1.75 (0.72) Winter flounder 1.63 (0.63) 1.62 (0.45) 0.96 (0.62) 1.06 (0.56) Windowpane flounder 8.87 (0.69) 8.16 (0.84) 2.11 (0.70) 1.92 (0.70) Monkfish 1.43 (0.98) 1.53 (0.75) 2.63 (1.03) 5.78 (1.72) FALL Winter skate 2.01 (.) 1.76 (.) 4.83 (.) 3.78 (.) Summer flounder 1.13 (0.67) 1.10 (0.59) 1.66 (0.73) 1.81 (0.92) Fourspot flounder 9.95 (1.26) 6.67 (0.62) 2.75 (0.46) 2.96 (0.43) Yellowtail flounder 3.99 (0.59) 4.15 (0.60) 4.25 (0.91) 4.31 (0.97) Winter flounder 1.80 (0.37) 1.93 (0.45) 1.89 (0.63) 1.95 (0.64) Windowpane flounder 9.80 (0.66) 8.86 (0.71) 7.47 (2.35) 3.10 (0.50) Monkfish 0.89 (0.73) 1.56 (0.55) 5.99 (2.07) 1.54 (0.76) C/R Average ratios (with) CVs in parenthesis 2009-2010 Paired SPRING GOM Day Night p Weight Number Weight Number Winter skate 3.32 (1.86) 2.61 (1.70) 2.67 (1.11) 2.75 (1.42) Little skate 7.89 (0.56) 7.13 (0.46) 1.77 (0.71) 1.54 (0.78) Thorny skate 0.56 (.) 1 (.) 34.32 (2.54) 1.59 (1.10) American plaice 2.06 (1.48) 1.72 (1.22) 1.64 (1.05) 1.48 (0.81) Yellowtail flounder 2.37 (0.6) 2.76 (0.75) 1.56 (0.68) 1.64 (0.65) Winter flounder 1.70 (0.57) 1.74 (0.54) 1.06 (0.82) 1.11 (0.94) Witch flounder 1.98 (0.61) 2.08 (0.68) 2.42 (0.37) 2.45 (0.35) Monkfish 3.23 (2.36) 1.48 (0.68) 3.19 (1.53) 1.49 (0.87) FALL Winter skate 1.16 (.) 8.67 (.) - - Little skate 6.42 (0.55) 5.83 (0.42) 1.93 (0.62) 1.63 (0.65) Thorny skate 30.15 (2.68) 4.33 (1.00) 3.49 (1.29) 3.24 (0.80) American plaice 2.49 (0.71) 2.51 (0.59) 2.99 (2.31) 2.15 (1.91) Yellowtail flounder 3.68 (0.62) 3.7 (0.64) 3.12 (1.33) 2.26 (0.94) Winter flounder 2.69 (0.69) 3.21 (0.71) 1.73 (1.10) 1.70 (1.02) Witch flounder 2.74 (0.68) 2.54 (0.70) 2.53 (0.54) 2.52 (0.53) Monkfish 4.57 (2.18) 2.28 (0.93) 2.43 (1.13) 1.36 (0.55) C/R Average ratios (with) CVs in parenthesis 2009-2010 Paired trawl study Sweep relative efficiency Model BI0 BI1 BI2 BI3 BI4 BB0 BB1 BB2 BB3 BB4 BB5 BB6 BB7 1 2 3 4 7 2 3 4 6 5 7 8 10 Winter skate 310.3 57.2 223.4 30.1 9.2 220.3 40.0 155.1 157.3 15.8 19.5 0.0 10.4 Leucoraja ocellata Little skate 1544.5 195.2 1521.8 181.4 0.3 942.6 174.6 938.1 866.9 158.5 138.8 0.0 - Leucoraja erinacea Summer flounder 145.3 0.0 147.2 2.9 3.1 98.5 0.7 100.6 101.8 3.6 - 4.0 7.5 Paralichthys dentatus Fourspot flounder 1611.0 167.8 1532.1 135.9 6.4 692.6 111.3 662.1 658.0 91.9 92.0 0.0 6.9 Hippoglossina oblonga Yellowtail flounder 1345.7 209.0 1319.7 206.6 0.2 672.7 161.2 673.5 642.6 161.4 110.2 0.0 2.1 Limanda ferruginea Winter flounder 915.9 131.7 911.8 124.9 - 382.0 83.2 382.9 377.0 80.2 82.0 0.0 23.4 Pseudopleuronectes americanus Witch flounder 265.9 4.4 267.2 7.4 - 179.7 0.0 182.4 186.2 3.7 6.4 - 8.6 Glyptocephalus cynoglossus Windowpane flounder 631.4 24.5 627.6 21.7 0.6 394.1 19.5 395.0 388.9 18.4 10.1 0.0 1.7 Scophthalmus aquosus Differences in AICs for each model, lowest AIC in bold Winter skate Little skate Summer flounder Fourspot flounder Yellowtail flounder Winter flounder Witch flounder Windowpane flounder Questions?.
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