Smooth Bottom Net Trawl Fishing Gear Effect on - New England ...

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NOAA/NMFS Unallied Science Project, Cooperative Agreement NA16FL2264 May 2005 <strong>Smooth</strong> <strong>Bottom</strong> <strong>Net</strong> <strong>Trawl</strong> <strong>Fishing</strong> <strong>Gear</strong> <strong>Effect</strong> on the Seabed: Investigation of Temporal and Cumulative <strong>Effect</strong>s BKAM/CR Figure 3.2.2.2-2 Mud Hole lane 1 September 2002 scours in hummocky sand 25
NOAA/NMFS Unallied Science Project, Cooperative Agreement NA16FL2264 May 2005 <strong>Smooth</strong> <strong>Bottom</strong> <strong>Net</strong> <strong>Trawl</strong> <strong>Fishing</strong> <strong>Gear</strong> <strong>Effect</strong> on the Seabed: Investigation of Temporal and Cumulative <strong>Effect</strong>s BKAM/CR Figure 3.2.2.2-3 Door scours observed at Little Tow lane 1 in September 2002 following chronic trawling Figure 3.2.2.2-4 Little Tow experimentally trawled lane 3 September scours from chronic trawling and sand waves 3.2.2.3 November 20, 2002 side-scan sonar survey results Sonar data for the final post-trawl survey in November of 2002 is particularly interesting and valuable because the survey was conducted shortly after a severe storm. The storm began on November 16 data significant wave height corded from January 1 to November 20, 2002 (Figure 3.2.2.3-1). Significant wave heights th and subsided by November 19 th based on meteorological and oceanographic recorded by the NOAA Boston Buoy 44013. The maximum significant wave height was 5.6 meters, recorded at 4 p.m. on November 17 th . This was the highest st re greater than 3.0 meters were recorded for 37 consecutive hours. The effect of this storm on the seabed was substantial and obvious on the sonar records. In areas characterized by fine muddy sand substrates i.e. Little Tow lanes 1 and 2, and all of Mud Hole, the storm appears to have eroded widespread shallow depressions (Figure 3.2.2.3-2; Appendix 3.2-A Figure TS-10)). The formation of these depressions was particularly noticeable along the courses of trawl scours. This suggests that these door scours, which September 2001 sonar and video observations indicate had clearly defined edges, were softened and expanded by the November 2002 storm-related currents. Some of these new features may represent areas where finer material had accumulated in depressions and subsequently been swept away by stormrelated currents. 26
Page 1: SMOOTH BOTTOM NET TRAWL FISHING GEA
Page 4 and 5: NOAA/NMFS Unallied Science Project,
Page 76 and 77: effective if the process of immigra
Page 78 and 79: effort, the critical pulse disturba
Page 80 and 81: Maciolek, N.J., R.J. Diaz, D. Dahle
Page 82 and 83: Table 3.3-2. Organisms observed per
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Table 3.3-5. Comparison of 2001 ROV
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Station LT02-1B - P2 Trawl<
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Station LT02-3A Trawl</stro
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Station LT02-4A - P1 Control Lane O
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Trawl Station Resu
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Trawl Station Resu
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Trawl Station Resu
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Table 3.6-2 2002 Trawl</str
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Table 3.6-3 (continued) CRUSTACEA A
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Table 3.6-5 Summary of Blackback (W
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Table 3.6-5 (continued) OTHERS Sarc
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Table 3.6-7 Dominant Species in Sed
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FIGURES
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Figure 1.0-2. Smooth</stron
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Figure 1.0-4 Side-scan sonar base m
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Figure 3.2.1-2 Bathymetric surface
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Number/minute 4 3 2 1 0 July Octobe
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Number/minute Number/minute 4 3 4 2
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Number/minute Number/minute 30 20 1
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Number/minute Number/minute 2.5 2 1
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Number/minute Number/minute July -
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Figure 3.4-2 For key species, the a
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Figure 3.4-4 For key species, the a
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Figure 3.4-6: Cluster analysis of M
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Figure 3.4-9 Little Tow 2002 Cluste
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Figure 3.4-12a. Little Tow 2001 and
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Note: [LT02 = Little Tow 2002 sampl
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Results of 2002 REMOTS Surveys to E
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Kg/Tow 200 180 160 140 120 100 80 6
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Kg/1000m2 Kg/1000m2 7 6 5 4 3 2 1 0
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Kg per 1000m2 350 300 250 200 150 1
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Numbe of individuals Number of Indi
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Number of individuals Number of ind
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PHOTOGRAPHS
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Photograph 2.2-2 Christopher Dunbar
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a. Chris Dunbar sieving benthic sam
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Photograph 2.7-1 CR Environmental e
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a. Fisherman Andrew Mirarchi viewin
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2001 2002 Cobble Bottom</st
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MH-3A July 2002 Pre-Trawl</
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MH-4A July 2002- Pre-Trawl<
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LT-1B July 2002- Pre-Trawl<
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LT-3A July 2002- Pre-Trawl<
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LT-4A July 2002- Pre-Trawl<
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Cobble bottom at Little Tow Small r
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2001 2002 Flounder Rock Crabs Sea S
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