仙台湾における底魚の生産構造に関する研究-1-マコガレイの食性と分布について(北方冷水海域における生物群集の生産に関する総合的研究)
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概要
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The flatfish, Limanda yokohamae, were obtained from catches taken by the coastal trawl fishery in Sendai Bay during 1967 ?? 1970. The fish feed mainly on small decapod crustaceans, Pinnixa rathbuni, from early spring to early summer. During the other seasons, they mainly eat polychaete worms, a species of Actiniaria and siphons of pelecypods in the seasons from summer to winter respectively in the neighbourhood of Ohne reef, and polychaete worms in other areas.The selective feeding of this fish was investigated by comparing the organisms found in the stomach with those found in the samples collected by SMITH-MCINTYRE type bottom sampler. This fish eat selectively burrowing organisms that are provided on the head with many tentacles or branchial filaments such as, tubicolous polychaetes with many tentacles or crown, a species of Actiniaria, siphons of pelecypods, Lebidoplax sp. and Opisthobranchia, but the fish avoid amphipods, the whole body of pelecypods, cumaceans and sipunchroids. Such food selection seems to reflect the mouth structure and the feeding behaviour of this fish.The density of this fish indicated by the catch per haul of the trawl net have a positive correlation with the density of the selected benthos. The most abundantly living place of this fish occurred in silty or very fine sand bottom area, where the density of the selected benthos is certainly higher than that in other areas. It seems that the distribution of this fish is affected by the density of these small benthic animals.
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