H. Cha, Jae Bong Lee, Sukyung Kang, D. Chang, J. Choi
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Reproduction of the jack mackerel, Trachurus japonicus Temminck et Schlegel in the coastal waters around Jeju Island, Korea: Maturation and spawning
was investigated based on the samplescaptured in the coastal waters around Jeju Island from January 2007 to December 2008. Gonadosomatic indexbegan to increase in March, and reached a maximum between April to June. After spawning it began to decreasefrom August. Reproductive season was estimated to March-July, with peak in April. Fecundity was proportionalto the size of the female, with the clutch size varying from 33,493 eggs in the smallest female(FL27.0cm) to627,061 eggs in the largest(FL40.6cm). Size at 50% sexual maturity(FL
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