GRANT
NUMBER: NA57FD0130
NMFS NUMBER: 93-SER-049
REPORT
TITLE:
Skimmer
Trawl Modifications to Reduce Bycatch in the Inshore Brown
and Pink Shrimp Fishery in North Carolina
AUTHOR:
Hines, Kenneth L. and Rulifson, Roger A., Institute for
Coastal and Marine Resources; Murray, James D. and Hines,
Bob, NC Sea Grant Marine Advisory Service
PUBLISH
DATE:
May
1996
AVAILABLE
FROM:
National Marine Fisheries Service, Cooperative Programs
Division, 9721 Executive Center Drive North, St. Petersburg,
FL 33702. PHONE: (813) 570-5364
ABSTRACT

The objective
of this project was to design, build, and test a low profile
skimmer trawl, and compare its performance to a standard
sized skimmer trawl for amount of catch, species composition,
and size of bycatch. Catch composition of a standard high
profile skimmer trawl net (12 ft.) and a low profile skimmer
trawl net (3 ft.) in the North and Newport Rivers, North
Carolina were compared. Each gear type was alternately
rigged on the port and starboard sides of a commercial
shrimping vessel and the catches were sampled according
to criteria established by the Southeast Area Monitoring
and Assessment Program, to determine if modifying skimmer
trawl nets by decreasing the vertical height of the net
would lower bycatch rates, yet maintain shrimp catch.
Total shrimp catch in the low profile net was significantly
lower than that in the control net (-32.9%, p=0.0001),
and significantly lower for brown shrimp (Penaeus aztecus)
by -39.1% (p=0.0001), but pink shrimp (P. duorarum)
catches were not significantly different (-17.1%, p=0.1934).
In the sample, weight of finfish biomass to total catch
biomass, excluding debris, was similar (47.5% finfish
in the low profile net and 44.8% finfish in the high profile
net). The low profile net was not effective in reducing
bycatch under most conditions. Because of the increased
catch rates of brown shrimp by the high profile net, results
suggest that shrimpers may find it advantageous to utilize
a high profile skimmer net during the brown and pink shrimp
seasons, rather than a low profile net. The low profile
net may be advantageous to fishermen under conditions
of high wind, shrimping in areas where tight turns are
mandated, presence of large amounts of floating debris,
and shallow water.