内海性浅海域の生物とその生態的機能を探る　　日本の二大マガキ養殖地の環境の比較―何がどう違うのか？―

DOI Web Site 被引用文献1件 参考文献16件
  • 神山 孝史
    独立行政法入水産総合研究センター東北区水産研究所海区水産業研究部

書誌事項

タイトル別名
  • Differences in Environmental Conditions between Two Representative Oyster-farming Areas in Japan
  • ニホン ノ ニダイ マガキ ヨウショクチ ノ カンキョウ ノ ヒカク ナニ ガ ドウ チガウノカ

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抄録

Hiroshima Bay (Hiroshima Prefecture) and Ishinomaki Bay (Miyagi Prefecture) are representative farming areas for the Pacific oyster Crassostrea gigas in Japan. To sustain the high productivity of oyster aquaculture, it is essential to clarify the characteristic environmental conditions in both areas. In the present study, the differences between Hiroshima Bay and Oginohama Bay (an inlet of Ishinomaki Bay) in environmental conditions, primary productivity and carbon transfer efficiency from primary production to oyster production are summarized. Among the environmental parameters, annual mean temperature, nutrient concentration, and abundance of prey organisms for oysters were higher and salinity was lower, in Hiroshima Bay than in Oginohama Bay. The maximum species number of tintinnid ciliates was the same in both bays, but while clear increases in species number were observed in Oginohama Bay in spring and autumn, the tintinnid species number in Hiroshima Bay was relatively stable in all seasons. The annual mean of primary production in Hiroshima Bay was 3.8 times higher than that in Oginohama Bay, while estimated carbon transfer efficiency from primary production to oyster production in and around Oginohama Bay was 2.6 times higher than that in Hiroshima Bay. All this suggests that food conditions for cultured oysters are more closely related to oyster production rates in the Oginohama area than in Hiroshima Bay. Consequently, oyster production per unit area in Hiroshima Bay was only 1.5 times higher than that in the Oginohama oyster-farming area, in spite of the much higher primary production in Hiroshima Bay.

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