Reproductive cycle of yellow croaker <Emphasis Type="Italic">Larimichthys polyactis</Emphasis> in southern waters off Korea |
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Authors: | Han Kyu Lim Minh Hoang Le Cheul Min An Sung Yeon Kim Mi Seon Park Young Jin Chang |
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Institution: | (1) Aquaculture Management Division, National Fisheries Research and Development Institute, Pusan, 619-902, Korea;(2) Department of Aquaculture, Pukyong National University, Daeyeon-3-Dong, Nam-Gu, Pusan, 608-737, Korea; |
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Abstract: | The reproductive cycle and batch fecundity of yellow croaker Larimichthys polyactis were examined in 981 specimens (286 males, 695 females) caught from waters around Mokpo, Busan, and Jeju-do (Korea) between
February 2008 and January 2009. Males and females with ripe-stage gonads were collected between April and June, at which time
the mean gonadosomatic indices were also high, indicating that the spawning season of yellow croaker around the waters off
southern Korea occurs from April to June. Degenerating postovulatory follicles as well as oocytes in the migratory-nucleus
stage or hydrated stage were found in ripe-stage gonads, suggesting that this species can spawn repeatedly in a season. Batch
fecundity in 45 females with migratory-nucleus or hydrated oocytes ranged from 19,396 to 106,311 eggs in fish varying from
20.0 to 26.7 cm in total length and was found to be positively related to total length and body weight. Our findings should
assist in implementing a proper stock assessment of yellow croaker around the waters off Korea. |
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