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Maturity and Spawning of Korean Mandarin Fish, Siniperca scherzeri in Soyangho Lake  

Shin, Ari (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Park, Heewon (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Lee, Wan-Ok (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Song, Mi-Young (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Ichthyology / v.30, no.2, 2018 , pp. 84-91 More about this Journal
Abstract
The study about maturity and spawning of Korean Mandarin fish, Siniperca scherzeri collected using the set net and gill net in Soyangho Lake from April to November 2014 was conducted. The number of individuals was 401 (female: 204, male: 197). The total length of females ranged from 113 mm to 365 mm and that of males was from 140 mm to 342 mm. The water temperature in May which is the start of spawning season indicated about $15^{\circ}C$ and gradually increased to July ($26^{\circ}C$). Gonadosomatic index (GSI) of females indicated 2.3%, 4.6% and 3.1%, respectively, in May to July. Males' value showed the similar pattern recording 8.0%, 6.6% and 4.5% in the same time. According to histological observations of gonadal tissue, the most of female in May had the gonadal tissue of maturing and mature stage. And the ovary of June was mostly in the stage of ripe and spawning and a number of individuals in July was recovery stage. In the case of male, a number of males in May showed in the stage of mature. The testis of June showed that mature sperm was releasing. And the testis of July was mostly in recovery stage. The total length at 50% group maturity was estimated 245.16 mm. As shown in the above, the main spawning period of S. scherzeri was May to June.
Keywords
Siniperca scherzeri; Soyangho Lake; Gonadosomatic Index (GSI); group maturity;
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