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Trawl-Net Selectivity And The Survival Of Fish Escaping From Cod-Ends : Proceedings Of A Rhode Island Sea Grant And New England Fishery Management Council Stock Conservation Engineering Workshop
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1988
[PDF-1.94 MB]
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Description:Perhaps the least desirable characteristic of trawl fishing gear is its tendency to indiscriminatel​y capture large numbers of immature, sub-legal, or non-marketable fish. Typically, these fish are discarded at sea and their likelihood of survival is reduced. The reasons for this have to do with the design of the trawl and its mode of operation. In particular, as a trawl made of diamond mesh fills with fish, meshes in the central portion of the cod-end become elongate in shape and the area for escape available to the smaller fish is reduced significantly. Reduction in escape area is considered to be the primary factor limiting trawl selection performance; attempts to design trawl gear in which all the meshes remain open during fishing are described. Also discussed are the scale damage and survival of young gadoid fish escaping from the cod-end of a demersal trawl. The following papers are included in this report: 1. Square and diamond mesh in trawl and seine net cod-end selectivity. J.H.B. Robertson pp. 7-15. 2. Scale damage and survival of young gadoid fish escaping from the cod-end of a demersal trawl. J. Main and G.I. Sangster pp. 17-33.
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Sea Grant Document Number:RIU-W-88-002
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Rights Information:Public Domain
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