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GRÉGOIRE, F., P. CHEVRIER, M.-N. CROTEAU, C. LÉVESQUE, 1995. Sélectivité des filets maillants dans la pêche au maquereau bleu (Scomber scombrus L.). II, Îles-de-la-Madeleine. Rapp. can. ind. sci. halieut. aquat., 234, 25 p .
A selectivity of the gillnets used in a mackerel (Scomber scombrus) fishery in Magdalen Islands was performed using the Sechin model. This model was chosen because it considers, in the calculation of the selectivity, not only the length of fish but also the shape of its body, its compressibility at the retention point and the elasticity of the netting material. The shape of the body is expressed by girth measurement made at different points between operculum and dorsal fins, i.e. in the region where the fish is more likely to be caught. All the 3002 fish sampled had a net mark. The variation of the position of the mark is linked with the length of the fish caught. When the length decreases, the mark moves from the opercular region to the dorsal fins region. With the exception of the 2 7/8" mesh size, an increase of the mesh size is expressed by an increase of the mode, the range length and the maximal efficiency of the selectivity curves. For gillnets having a mesh size of 2 3/4", 3" and 3 1/4", modes were 348 mm, 362 mm and 388 mm respectively. Wear and other factors are suggested to explain the difference observed in the 2 7/8" mesh size case.
GRÉGOIRE, F., C. HUARD, M.-N. CROTEAU, C. LÉVESQUE, 1995. Sélectivité des filets maillants dans la pêche au maquereau bleu (Scomber scombrus L.). I, Baie des Chaleurs. Rapp. can. ind. sci. halieut. aquat., 233, 36 p .
Girth and length measurements were taken on 5,203 mackerels to describe, according to Sechin's model, the selectivity of the drifting gillnets used in Baie des Chaleurs. The highest maximum efficiency is observed for mesh size of 2 3/4" and the length of maximum efficieny is higher for welded mesh of size 2 7/8" than knotted mesh of the same size.
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