What can be expected of a T90 extension piece to improve selectivity in bottom trawl multispecific fisheries in the Bay of Biscay?

Type Article
Date 2018-07
Language English
Author(s) Kopp DorotheeORCID1, Morandeau Fabien1, Mouchet Maud2, Vogel CamilleORCID3, Mehault Sonia1
Affiliation(s) 1 : IFREMER, Lab Technol & Biol Halieut, Unite Sci & Technol Halieut, 8 Rue Francois Toullec, F-56100 Lorient, France.
2 : UPMC, Ctr Ecol & Sci Conservat, MNHN, UMR 7204,CNRS, CP135,43 Rue Buffon, F-75005 Paris, France.
3 : IFREMER, Fisheries Resources Lab, Fisheries Sci English Channel & North Sea, Ave Gen Gaulle, F-14520 Port En Bessin Huppain, France.
Source Fisheries Science (0919-9268) (Springer Japan Kk), 2018-07 , Vol. 84 , N. 4 , P. 597-604
DOI 10.1007/s12562-018-1203-8
Keyword(s) Gear technology, Covered codend, Turned mesh, Escape, Discard ban
Abstract

In the Bay of Biscay, the selective properties of otter trawls have mainly been studied with regard to single species. However, for bottom trawl multispecific fisheries targeting fish, it remains challenging to find a selective device capable of limiting catches of small individuals of several species without commercial losses. The present study focuses on an innovative technical solution to reduce catches of undersized individuals in a multispecies bottom trawl fishery in the Bay of Biscay. We tested a cylinder made of 100-mm diamond meshes turned at 90°, namely T90 inserted in the extension piece. We present the selectivity results obtained for six commercial species. This device allows the escape of small Solea solea, Trachurus trachurus and Spondyliosoma cantharus individuals. No commercial losses of Sepia officinalis were recorded. Patterns for Dicentrarchus labrax and Mullus surmuletus require further investigation due to limited fish size ranges in the dataset.

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