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 3.0 CHRONIC TRAWL STUDY RESULTS 3.1 Water Column Characteristics Representative plots of water quality profiles and CTD cast logs for each of the three cruises in August, October and November 2002 are provided in Appendix 3.1-A. CTD casts at Mud Hole were taken from 9:38 to 11:22 on August 1, 2002, with the exception of the cast at MH-3A (17:19). Casts at Little Tow were taken between 14:26 and 18:38 on August 1, 2002. Surface water temperatures at Mud Hole and Little Tow were around 20 degrees C. A steep thermocline was present between about 10 and 60 ft, with bottom temperatures of approximately 7 degrees C. Salinity profiles were fairly uniform at both sites, with surface (0 to 30 ft) salinities of approximately 31 to 31.5 ppt (parts per thousand) and slightly higher salinities in deeper water of about 32 ppt. Turbidity was non-detectable (
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 • Water column salinities ranging from 31 to 33 ppt over the study period, and slightly lower salinities near the surface during the summer. • Dissolved oxygen levels generally slightly higher in the surface waters compared to the bottom water and highest in the summer. • Low turbidity throughout the water column during the study period with some slightly higher readings within 10 ft of the bottom and mid-thermocline. 18
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 3.6-2 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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