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Scale damage and survival of cod and haddock escaping from a demersal trawl

Soldal, Aud Vold; Isaksen, Bjørnar; Marteinsson, Jon Einar; Engås, Arill
Working paper
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CM_1991_B_44.pdf (1.706Mb)
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http://hdl.handle.net/11250/104864
Utgivelsesdato
1991
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be cited without prior reference to the authors  
Sammendrag
Cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.) escaping through the

meshes of a cod-end (135 mm diamond meshes) or through a metal grid sorting device

mounted in the foremost part of the cod-end, were withheld in cages (2x2x5m) covering the

cod-end during trawling. The scale loss of the escaped fish was examined and compared to that of cod and haddock from a control group. On average, less than 1% of the total body

surface of cod was injured, while haddock, particularly those smaller than 40 cm, showed

substantial scale loss.

Cages containing escaped fish were released from the trawl by means of an acoustic releaser

and kept for observation (UTV) at sea bottom for 12 to 16 days. No mortality was found for

cod, and the mortality of mesh and grid selected haddock was less than 10%. Methodological

problems that may have lead to errors in the mortality estimates are discussed.
Utgiver
ICES
Serie
ICES CM Documents;1991/B:44

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