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Aspects de lalimentation et du comportment alimentaire du crabe-des-neiges, Chionoecetes opilio O Fabr dans le sud-ouest du Golfe de St-Laurent Decapoda, Brachyura


, : Aspects de lalimentation et du comportment alimentaire du crabe-des-neiges, Chionoecetes opilio O Fabr dans le sud-ouest du Golfe de St-Laurent Decapoda, Brachyura. Crustaceana (Leiden): 473: 235-244

The stomachs of 480 specimens of the snow-crab, C. opilio, from the entrance of the Chaleur Bay were collected in May 1980 and 418 contained the remains of at least one prey. Snow-crabs feed mostly in the middle of the night but feeding activity seems possible during day time. The estimated daily ration is .apprx. 0.4% of the live weight. Crustacea occupied on the average 34%, in number, of the stomach content. Mollusca 21%, Echinodermata 17% and Polychaeta 12%. The frequency with which these preys occurred was 64% for Crustacea, 32% for Echinodermata, 31% for Mollusca and 23% for Polychaeta. This overall pattern depended on the depth of sampling. Above 90 m, Crustacea occurred most frequently followed by Mollusca and Echinodermata; Crustacea and Mollusca. Ivlev's electivity index was highest for Echinodermata at every depth but increased from shallow to deeper bottoms. Those observations indicate an opportunistic feeding behavior on epifauna. A depth segregation observed between mature and immature males also suggest some change of diet during the life history of the snow-crab.

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