エゾアワビの生態学的研究-III : 女川湾付近におけるエゾアワビの生産構造の解析
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概要
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Annual fluctuation in catches of abalones in northern part of Japan is quite significant. The present study has been made to search the cause of fluctuation in the production of abalones. The results are as follows: (1) The annual fluctuation in the growth of the abalone is considered to be no significant correlation with the environmental factors such as the temperature and salinity of water. (2) The said fluctuation shows a high correlation with the amount of catch of sea-weed. Especially, it is recognized that it has a significant and positive correlation with the amount of catch of Undaria pinnatifida, a brown sea-weed favorite food for abalone, as shown in Table 8. (3) The annual fluctuation in the amount of catch of the abalone is parallel to that of the growth of the abalone. (4) It has already been reported by the authors1) that U. pinnatifida and Laminaria are the most suitable food for H. discus hannai. Presuming from these facts, it is easily conceivable that the production of abalones is influenced by the production of sea-weed, especially by that of the brown-algae such as U. pinnatifida or Laminaria. (5) That the fluctuation in production of U. pinnatifida is closely related with the variation of the Kurile current, commonly called “Oyashio”, has already been reported by the author6). In consequence, it is assumed that the production of the brown-algae like U. pinnatifida being influenced by the condition of “Oyashio”, furthermore, the production of the brown-algae becomes the main factor affecting on the production of the abalone.