釣餌に対する複数魚種問の競合〔英文〕
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概要
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The number of one fish species caught strongly depends on the presence of another species in a long-line or multiple hook fishery. This effect is examined by means of a simple deterministic model for baited hook types of gear. The model provides that the presence of foods for a specific species is either available or not under competition. In vertical hand-line and pole-line fishings, it is found that the numbers of Paracaesio, grouper and skipjack being caught are less than the number obtained under a competition free from another species which may forage more exclusively. Additionaly, the catches of two species under competition do not vary only as a function of the proportion of each species but functions of individual weight of fish and their intensity of interference. To smooth the bias of catch by the various intervals of angling, the correction factors are obtained. The estimated values may vary in accordance to baits availability due to the intensity of interference with another species.
- 日本水産學會の論文