Effectiveness of bycatch-reduction devices in roller-frame trawls used in the Florida shrimp fishery
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Published source details
Crawford C.R., Steele P., McMillen-Jackson A.L. & Bert T.M. (2011) Effectiveness of bycatch-reduction devices in roller-frame trawls used in the Florida shrimp fishery. Fisheries Research, 108, 248-257.
Published source details Crawford C.R., Steele P., McMillen-Jackson A.L. & Bert T.M. (2011) Effectiveness of bycatch-reduction devices in roller-frame trawls used in the Florida shrimp fishery. Fisheries Research, 108, 248-257.
Actions
This study is summarised as evidence for the following.
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Fit large, supported escape openings (such as Fisheyes, Bigeyes and radial escape sections) to trawl nets Action Link |
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Fit large, supported escape openings (such as Fisheyes, Bigeyes and radial escape sections) to trawl nets
A replicated, paired, controlled study in 1997–1999 of two coastal seabed areas in the Atlantic Ocean off Florida, USA (Crawford et al. 2011) found that large, supported escape openings (four designs) fitted to a shrimp roller-frame trawl net reduced the overall unwanted catch of finfish in three of four cases compared to a standard net without escape openings. Across all trials, average catch weights (and numbers, see paper for data) of all non-target finfish were lower in nets with an extended-mesh funnel design of escape opening, both with and without a stimulator cone (funnel: 20–206 g/effort, standard: 53–309 g/effort) and in nets with a Florida Fisheye design and stimulator cone (Fisheye/cone: 107 g/effort, standard: 275 g/effort), compared to standard nets. Total finfish catch rates in nets with just a Florida Fisheye (no stimulator cone) were similar to standard nets (Fisheye/ no cone: 112–230 g/effort, standard: 111–248 g/effort), however, the effect varied between individual fish species (see paper for data). Data were collected from 158 paired trawl deployments targeting pink shrimp Farfantepenaeus duorarum in two areas: at Tarpon Springs in October 1997 and March and October 1998 (research vessel), and at Biscayne Bay in November/December 1999 (commercial vessel). One trawl net equipped with one of two escape opening designs (large-mesh extended-mesh funnel or Florida Fisheye), with and without a stimulator cone (nylon webbing designed to prevent finfish from reaching the codend), was towed on one side of each vessel. On the other side a standard net was towed at the same time. Finfish in the catches were sorted by species and weighed.
(Summarised by: Khatija Alliji)
Output references
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