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 Station Little Tow lane 1 station B appears to be located in hummocky muddy sand with nearby sand waves. Project-related gear impacts were clearly visible on the September 30 th and November 20, 2002 sonar imagery. Door scours observed in November appeared slightly wider and deeper than those observed in September, possibly due to the influence of the November storm. Door marks were observed within approximately 12-meters of the centerline of lane 1 near station B. <strong>Gear</strong> impact along the majority of the lane at this location was likely caused by the sweep of the net, chain and cookies. Figure 3.2.2.4 –4a October 2002 grab sample locations at Little Tow lane 1 station B As shown on Figure 3.2.2.4 –4a (above) and Figure 3.2.2.4-4b (below) the majority of grab samples collected in September and November 2002 were located slightly to the western side of trawl lane 1 in an area shown to have been heavily impacted by project-related door impacts. 33
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 3.2.2.4 –4b November 2002 grab sample locations at Little Tow lane 1 station B Little Tow Control Lane 2 in the Vicinity of Station B Pre-trawl sonar data for the paired Little Tow reference lane 2 shows background otter trawl and scallop gear impacts along the entire length of the lane (see Appendix 3.2-A Figure TS-2). Little Tow lane 2 station B appears to be located in hummocky muddy sand within meters of a small patch of sand waves. GIS analysis of grab sample locations and sonar data suggests that none of the samples collected from Little Tow control lane 2 near station B were impacted by any project-related fishing gear. Project-related gear impacts including door scours were visible to the southwest of Little Tow control lane 2 near station B on September 30 th and November 20, 2002 sonar imagery, however, they were over 20 meters from the grab sampling stations. Little Tow Experimentally <strong>Trawl</strong>ed Lane 3 in the Vicinity of Station A Little Tow lane 3 station A is located in an area characterized by flat muddy sands widely interspersed with small to large cobbles and faint sand ripples (see Appendix 3.2-A, Figure TS- 3). Bathymetric data shows that this area slopes gently down to the east (Figure 2.3.1-2). Pretrawl sonar data for Little Tow lane 3 shows background scallop gear impacts along the entire 34
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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Page 86 and 87: Table 3.3-5. Comparison of 2001 ROV
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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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Smooth Bottom Net Trawl Fishing Gear Effect on - New England ...

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