Reproduction and depletion of the Manila clam in Maizuru Bay, Sea of Japan

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  • 日本海の舞鶴湾におけるアサリ資源の再生産および減耗要因の検討
  • ニホンカイ ノ マイズルワン ニ オケル アサリ シゲン ノ サイセイサン オヨビ ゲンモウ ヨウイン ノ ケントウ

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Abstract

<p> We aimed to confirm the reproduction of Manila clam Ruditapes philippinarum in Maizuru Bay, and also determine the cause of their mortality. Using seedling collectors, we obtained 5 to 60 juveniles per collector, demonstrating that this species is reproducing in the bay. Depletion of clams in Maizuru Bay was investigated by setting clams on coastal area sea beds in the summer. Predation was found to be more effective in depleting clams than environmental factors. Laboratory experiments revealed that juveniles less than 5 mm in shell length were preyed upon by 6 out of 13 fish species, whereas Japanese rock crab preyed upon clams from juveniles to adults.</p>

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