Larval and Juvenile Ichthyofauna in Surface Waters of the Inner Tokyo Bay: A Probability of Spawning by Konosirus punctatus and Engraulis japonicus

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  • 東京湾内湾の表層域における仔稚魚相－コノシロとカタクチイワシの産卵の可能性－
  • トウキョウワン ナイワン ノ ヒョウソウイキ ニ オケル シチギョソウ コノシロ ト カタクチイワシ ノ サンラン ノ カノウセイ

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In order to clarify the larval and juvenile ichthyofauna in surface waters of the inner Tokyo Bay, we collected fishes using a larval net (mouth diameter 1.3 m and mesh size 0.5 mm) at two stations between 2018 and 2019. A total of 8,461 larval and juvenile fishes were collected, representing more than 21 species in 15 families. The dominant spe-cies were Engraulis japonicus (40.7% of the total individuals), Konosirus punctatus (33.9%) and Sardinella zunasi (10.8%). The dominance of these three species has been observed in Tokyo Bay since the 1990s, and no major changes in the larval and juvenile ichthyofauna was observed. E. japonicus and K. punctatus were abundantly repre-sented by egg as well as larval fish shortly after hatching. These results and records of adult fish occurrence patterns in the coastal areas of the inner Tokyo Bay suggest that E. japonicus and K. punctatus may spawn in the inner Tokyo Bay, although they were thought to spawn mainly in the outer Tokyo Bay

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