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 3.2.2.3-2 Little Tow lane 2 November 2002 sand waves and scour In areas with coarser sand substrates, such as Little Tow lanes 3 and 4, the effect of the storm was more dramatic. Along Little Tow lanes 3 and 4, a 765-meter long field of sand waves replaced the relatively flat sandy bottom documented in July and September (see Appendix 3.2- A Figure TS-9). The wavelength of these sand waves was fairly uniform at approximately 70centimeters. The ridge orientation of the waves was northwest/southeast, roughly parallel to the dominant wind direction during the November 2002 storm (~40 degrees), and highlights the extensive impact of wind and wave action during storm events on the benthos in the shallower fishing ground of Little Tow. 3.2.2.4 Time-series sonar observations at benthic grab stations The following is a review of the side-scan sonar images for the paired control and experimentally trawled lanes at Mud Hole and Little Tow in the vicinity of the benthic grab stations for late July 2002 (pre-chronic trawling), and September and November 2002 (post-chronic trawling). Mud Hole Observations: Mud Hole Experimentally <strong>Trawl</strong>ed Lane 1 in the Vicinity of Station B 27
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 station MH-1B is located near the toe of a slope that rises gradually to the north (Figure 3.2.1-1). The substrate at this location appears to be relatively flat sandy mud. Pre-trawl sonar data for Mud Hole lane 1 shows widespread faint background gear impacts consistent with door marks. Background door marks were not observed in the vicinity of sampling station MH- 1B. Project-related trawl gear impacts were clearly visible on the September 30 - pacted by trawl doors. November amples from MH-1B were clustered around the planned lane centerline where trawl gear pacts likely consisted of chain and cookies of the sweep. th and November 20 sonar imagery near station MH-1B. Background door marks observed during the pre-trawl survey remain visible on September 30 th and November 20 th images. These scours appear broader and less distinct in November compared to previous records likely due to sediment transport by bottom currents associated with the November storm. As shown on Figure 3.2.2.4 1a and b (below) samples collected from station MH-1B in October 2002 extended into the western portion of the trawl lane which had been directly im s im Figure 3.2.2.4-1a October 2002 grab sample locations in the vicinity of MH-1B th 28
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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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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