IMPACT OF FUTURE CHANGES IN WATER TEMPERATURE ON THE UPSTREAM MIGRATION TIMING OF SWEETFISH

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  • 水温の将来変化がアユの遡上時期に及ぼす影響について
  • スイオン ノ ショウライ ヘンカ ガ アユ ノ ソジョウ ジキ ニ オヨボス エイキョウ ニ ツイテ

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Abstract

In this study, climate change impact of future water temperature on the fishery resources was considered. Future water temperature changes of Kiso River and Ise Bay were calculated by coupled river-ocean model under the CMIP3 A1B scenario. Water temperature increase of Kiso River was about 3 degrees, and sea surface temperature increase of Ise Bay was about 2 degrees. Coastal areas were more strongly influenced.<br>By the analysis of observed data, the upstream migration timing of sweetfish was negatively correlated with water temperature difference (sea – river). Calculated future water temperature difference was smaller than that of present, which resulted in earlier start of the upstream migration of sweetfish.

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