At sea trials were conducted comparing the catch composition and weight of standard Nephrops scraper trawls and a new trawl termed the Flip Flap netting Grid trawl (FFG). The FFG includes a 160 mm mesh size netting in the top wing and top sheet netting panels, flip-flap netting grid, and fish outlet hole and 200 mm square mesh panel fitter in front of the fish outlet hole. The FFG trawl resulted in a ~30% reduction (number) of small cod around 32 cm in length but not in fish smaller than this. A 33% reduction was seen for cod sized 35 cm and a 76% reduction for cod 87 cm in size. In addition, there was a 73% reduction in cod by weight. For haddock, there was a 51% reduction of haddock around 21 cm, 67% for fish 30 cm in size (MLS) (and weight), and a 73% reduction for fish 44 cm in size. For the smallest whiting (26 cm) there was a 62% reduction, at the MLS (27 cm) there was a 64% reduction and for 48 cm fish an 84% reduction. By weight, there was an 82% reduction. Catches of Nephrops were similar for the two gear types.
Year
Journal/Publisher Name
Marine Scotland Science Report
Volume (Issue #)
08/12
Page #s
16
Contact information
Marine Scotland Science, Marine Laboratory, 375 Victoria Road, Aberdeen, AB11 9DB
Summary
Field Studies
Field Study 828
Study Type
Field study in the wild
Location
Scotland
Target catch
Nephrops
Effect on bycatch species
FFG reduced bycatch of cod, haddock, and whiting
Effect on target catch
No effect
Bycatch species
Reduction technique
Fishing Gear