Age, growth and reproductive characteristics of round herring Etrumeus teres in the East China Sea

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  • 東シナ海におけるウルメイワシの年齢・成長と成熟特性
  • ヒガシシナカイ ニ オケル ウルメイワシ ノ ネンレイ セイチョウ ト セイジュク トクセイ
  • Age, growth and reproductive characteristics of round herring (in Japanese with English abstract)

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  We analyzed the biological characteristics such as growth and maturation of round herring Etrumeus teres in the East China Sea. Von Bertalanffy's growth curve was calculated based on monthly size frequency distributions from 1997 to 2009, and the estimated growth formula was BLm=244.8[1−exp {−0.10(m−0.55)}](r2=0.92, p<0.01), where BLm is body length at age m (months). Additionally, the estimated formula was supported by the results of scale reading in the adult stage and number of otolith increments in the juvenile stage. Based on histological observations of the gonads, the main spawning period in the East China Sea was from December to June. Combining the results from the growth model and relationships between body length and maturation rate, the first maturation age was estimated to be one year old for both sexes.<br>

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