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 Signal source Towfish Figure 3.3.2-1 – Example of sonar shadowing behind the peaks of sand waves The following sections detail sonar seabed observations for each of the study lanes (2 control and 2 trawl lanes at Mud Hole and Little Tow, respectively). To facilitate documentation of projectrelated changes, time-series figures were prepared for each of the eight 2002 benthic grab locations (see Time Series Figures in Appendix 3.2-A). These side-scan images from July, October, and November 2002 are centered on the grab sampling station, and depict georeferenced sonar imagery for each of the three surveys at approximately the same location (image projections are slightly different due to inaccuracy associated with layback calculations). Additional figures of sonar imagery (both waterfall and geo-referenced) were prepared to document seabed conditions along other portions of the survey lanes. 3.2.2.1 Pre-chronic trawling side-scan survey results Evidence of bottom fishing activity was observed on the July 29, 2002 side-scan sonar records for each of the eight survey lanes (MH-1, -2, -3, and -4 and LT-1, -2, -3 and -4). Note that Mud Hole and Little Tow lanes 1 and 3 were experimentally trawled in our 2001 acute impact study. In July 2002, control lanes (i.e. reference lanes) also showed signs of bottom fishing impacts. The dimensions of these fishing artifacts on the sonar records suggest that study lanes were impacted by otter trawl and scallop dredge gear (see Figure 3.2.2.1-1 on the following page). 21
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 3.2.2.1-1 <strong>Bottom</strong> disturbances and fish observed along Mud Hole lane 3 in late July 2002 prior to chronic trawling Figure 3.2.2.1-2 <strong>Bottom</strong> disturbances observed on Little Tow lane 1 in late July 2002 prior to chronic trawling 22
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
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Page 80 and 81: Maciolek, N.J., R.J. Diaz, D. Dahle
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Table 3.3-2. Organisms observed per
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Table 3.3-4. 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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