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 3.2.2.4 –1b November 2002 grab sample locations along Mud Hole Lane 1 at station B. Mud Hole Control Lane 2 in the Vicinity of Station B Bathymetric data shows that station MH-2B is located at the toe of a slope that rises to the northwest (Figure 3.2.1-1) in an area that appears to be characterized by flat sandy mud (see Appendix 3.2A Figure TS-6). Pre-trawl sonar data for station MH-2B shows faint background trawl gear impacts. Lane 2 in Mud Hole was designated a control lane, however, some project-related gear impacts were observed in the western portions of the September 30 th and November 20 th sonar imagery in the vicinity of MH-2B. These gear impacts appear to have come within approximately 25meters of the centerline of lane 2, i.e. just within the western edge of this control lane. As shown on Figure 3.2.2.4-2a (below) two of the grab samples collected in October may have been compromised by these trawl impacts (i.e. the MH2B grain size sample and the MH-2B benthic grab replicate 1). All November grab samples were collected from non-impacted areas closer to the center of this control lane (Figure 3.2.2.4-2b). Background door marks were still visible on the September and November side-scan imagery. Again trawl scours in November appeared broader and less distinct than in previous records and likely due to sediment transport from bottom currents associated with the November storm. 29
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 3.2.2.4-2a October 2002 grab sample locations along Mud Hole control lane 2 near station B Figure 3.2.2.4-2b November 2002 grab sample locations along Mud Hole lane 2 near station B 30
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
Page 84 and 85: Table 3.3-4. Organisms observed per
Page 86 and 87: Table 3.3-5. Comparison of 2001 ROV
Page 88 and 89: 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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Smooth Bottom Net Trawl Fishing Gear Effect on - New England ...

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