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 Mud Hole Experimentally <strong>Trawl</strong>ed Lane 3 in the Vicinity of Station B Mud Hole station MH-3B is located in a relatively flat portion of the survey area (see Figure 3.2.1-1). The substrate at this location appears to be sandy mud. Pre-trawl sonar data for MH- 3B shows faint background gear impacts consistent with door marks (see Appendix 3.2-A Figure TS-7). Project-related gear impacts on this experimentally trawled lane were clearly visible on the September 30 th and November 20, 2002 sonar imagery near MH-3B. Background door marks observed during the pre-trawl survey remain visible on the September and November images. As noted for other stations, the November scours appear broader and less distinct than in previous records, likely due to bottom currents associated with the November storm. As shown on Figure 3.2.2.4 -3a and 3b (below), samples collected from MH-3B in October extended into the western portion of the trawl lane in an area directly impacted by trawl doors. November samples from MH-1B were clustered around the planned lane centerline where gear contact likely consisted of trawl chain and cookies. Figure 3.2.2.4-3a October 2002 grab sample locations along Mud Hole experimentally trawled lane 3 at station B 31
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 3.2.2.4-3b November 2002 grab sample locations along Mud Hole experimentally trawled lane 3 at station B Mud Hole Control Lane 4 in the Vicinity of Station B Grab sampling station MH-4B is located in a relatively flat portion of the study area (see Figure 3.2.1-1) and was the deepest station sampled in 2002. The substrate appears to be fine sandy mud (see Appendix 3.2-A Figure TS-8). Pre-trawl sonar data for Mud Hole control lane 4 near station B shows faint background trawl gear impacts oriented both parallel and roughly perpendicular to the lane. These background door marks were still visible on the September 30 th and November 20, 2002 imagery. The scours observed in November appear broader and less distinct than in previous records, likely due to bottom currents associated with the November 2002 storm. Control lane 4 in the vicinity of sampling station MH-4B was free of any project-related gear impacts following review of the September 30 th and November 20, 2002 sonar imagery. Little Tow Observations: Little Tow Experimentally <strong>Trawl</strong>ed Lane 1 in the Vicinity of Station B Pre-trawl sonar data for Little Tow lane 1 shows background otter trawl and scallop gear impacts along the entire length of the lane (see Appendix 3.2-A Figure TS-1, and Figure 3.2.2.1-2). 32
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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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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