北海道における漁獲試験結果に基づく魚礁性の定量化とその考察

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  • Quantification of the Reef Affinity Based on the Results of Fish Catch Experiments
  • ホッカイドウ ニ オケル ギョカク シケン ケッカ ニ モトヅク ギョショウセイ ノ テイリョウカ ト ソノ コウサツ

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The reef affinity defined as the degree that fish gather at fish reefs has not progressed beyond qualitative evaluations. So, quantitative evaluation is needed. For this reason, indexation of the reef affinity was tested using the fish catch examination results of artificial reefs in comparison with areas without reefs. This fish catch examination was carried out 181 times in nine areas around the Hokkaido coast. First, the existence the reef affinity of each species of fish was tested. Consequently, of 29 species of fish, 15 species were considered to show reef affinity at a statistically significant level. Furthermore, a reef affinity index was defined. The reef affinity index is a numerical value reflecting the fish catch frequency and the number of individuals in a fish reef. And, the reef affinity index was computed for the 29 kinds of caught fishes. As for the reef affinity index of flounders including barfin flounder or halibut, the tendency of ranking was accepted for this result. Moreover, the reef affinity of fishes other than the flounders including rock trout or Atka mackerel was classified into three groups. As stated above, the reef affinity index is considered to be an effective index, in order to quantitatively evaluate the reef affinity of fishes.

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