GRANT
NUMBER:
NA76FD0141
NMFS NUMBER:
96-NER-098
REPORT
TITLE:
The Effects of Off-Bottom Ground Gear on Flatfish Catches
in the Southern New England Whiting Fishery
AUTHOR:
Dana L. Morse
PUBLISH
DATE:
September 14, 1999
AVAILABLE
FROM: National
Marine Fisheries, Northeast Region, One Blackburn Drive,
Gloucester, MA 01930. TELEPHONE: (978) 281-9267
ABSTRACT

Bycatch of
regulated ground fish species, primarily flatfish, have
been a constrant issue in New England fisheries for whiting
(Merluccius bilinearis). Gear modifications
in present use in the fishery all occur behind the wing
ends, such as the use of sorting grates, or raised footropes.
Previous work indicates that it may be possible to select
against flatfish from whiting catches by adjusting the
ground gear and bridles. In this study, three modifications
to traditional ground used in whiting trawls were examined,
testing their efficacy in reducing flatfish catches, by
raising the ground gear off the seabed. Experiment
#1 employed 12"-diameter rubber bunt bobbins placed
along the ground gear and lower leg of the bridle.
Experiment #2 employed 18" bunt bobbins, and experiment
#3 examined the use of 18" bobbins in conjunction
with trawl floats placed along the cables. Statistically
significant reduction in the catch rate for two flatfish
species occurred in the third set of trials, without significant
reduction in the catch rate of whiting.