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Initial Tests of a Flexible Grate for Size Selection of Trawl Caught Fish

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The fish size selection and handling features of a trawl-mounted flexible grate were tested. The grate was constructed of fiberglass rods and neoprene strips to be flexible enough to bend around a net reel, but rigid enough to maintain consistent, long, rectangular openings for fish size selection during trawling. A 244 cm × 140 cm grate, installed in the extension section of a bottom trawl, was tested for size selection of walleye pollock (Theragra chalcogramma) in the Bering Sea by means of a small mesh auxiliary net that collected escapees. A grate with 44 mm spacing had an L50, the length at which 50% of the fish escaped, of 37 cm and a selection range estimated at 10 cm. Few fish longer than 44 cm escaped, corresponding to pollock with head widths equal to the 44 mm bar spacing. The grate was easily deployed and retrieved from a net reel, without any special gear handling procedures required. In-situ video observations using infrared illumination confirmed that the panel and collection net assumed their correct configurations and that escaping pollock passed easily through the grate.
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Keywords: cover net; grate; infrared illumination; pollock; selectivity; trawl

Document Type: Research Article

Publication date: 01 January 1999

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  • The Marine Technology Society Journal is the flagship publication of the Marine Technology Society. It publishes the highest caliber, peer-reviewed papers on subjects of interest to the society: marine technology, ocean science, marine policy and education. The Journal is dedicated to publishing timely special issues on emerging ocean community concerns while also showcasing general interest and student-authored works.
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