内海性浅海域の生物とその生態的機能を探る　　瀬戸内海の浅海域における魚類幼期個体の出現特性

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  • Characteristics in Occurrence of Fish Early Life Stages of the Shallow Waters of the Seto Inland Sea
  • セトナイカイ ノ センカイイキ ニ オケル ギョルイ ヨウキ コタイ ノ シュツゲン トクセイ

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Species composition of fish early life stages was compared among different habitats in shallow waters of the Seto Inland Sea. Data from monthly surveys in three habitats (offshore area, inshore area, and fishing port) in the Sea of Hiuchi, central part of the Seto Inland Sea, during the late 1990s was analyzed. In total, 51, 322 fishes belonging to more than 97 taxa in 49 families were collected with a larva-net at eight offshore sampling stations. 9, 521 fishes belonging to more than 38 species in 24 families were collected with a small-triangle net at 10 inshore stations, and 13, 561 fishes belonging to more than 44 species in 26 families were collected by light-trap sampling in the fishing port. The ichthyofauna of the three habitats was diverse and abundant from late spring to early summer. Differences in the composition of the dominant species among the three habitats indicate that each habitat serves as a nursery for different fish species. Intra-habitat comparison of fish species in summer between inshore stations without vegetation (i.e., sandy beaches) and those with vegetation (i.e., seagrass or macroalgal beds) showed a significant effect of vegetation on dominant fish species composition. The differences in composition of young fish species among the habitats indicate that integrated conservation of the different fish habitats in shallow waters is indispensable for sustainable use of fishery resources in the Seto Inland Sea.

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