北海道苫小牧におけるバカガイ若齢個体群の分布と減耗
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概要
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This paper examined the distribution and mortality rates of the sunray surf clam Mactra chinensis at 0-2 years old in Tomakomai, southwest Hokkaido. The distribution of each age group was observed at 9m parallel to the shoreline. The distributional pattern defined by Morisita's index Ið was contagious in each age group. The correlation between the density of the 0-year-old population and particle size of the sediment was significant. These results suggest that the distribution of this species is affected by the fluid conditions on the habitat at 0 years old. The age-specific mortality rates of 0-2 year olds were 89.2-97.8, 45.8-47.6, and 42.0%, respectively.
- 日本水産學會の論文
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