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http://dx.doi.org/10.5657/KFAS.2019.0496

Comparison of the Reproductive Characteristics of Sweetfish Plecoglossus altivelis in the Main Streams of Jeju Island  

Kim, Han-Jun (Marine Ecosystem Research Center, KIOST)
Park, Chang-Beom (Gyeongnam Department of Environmental Toxicology & Chemistry, Korea Institute of Toxicology (KIT))
Lee, Young-Don (Marine Science Institute, Jeju National University, Je)
Choi, Young-Ung (Marine Ecosystem Research Center, KIOST)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.52, no.5, 2019 , pp. 496-510 More about this Journal
Abstract
We investigated the reproductive characteristics of the sweetfish Plecoglossus altivelis, including changes in the gonadosomatic index (GSI), frequency of gonad developmental stages, and abundance of drifting larvae, in three streams (Gangjeong, Yeonoi, and Ongpo) on Jeju Island from May 2004 to December 2005. The GSI values of female P. altivelis in all Jeju streams began to increase in September and reached a maximum in October and November. Peak GSI values in males occurred in Gangjeong from October to November, in Yeonoi from November to January, and in Ongpo from September to October. The gonadal development of P. altivelis was classified into four stages: growth (March to October), maturity (September to December in females; July to December in males), spawning (September to January), and degeneration (October to March in females; after November in males). Drifting larvae were collected from October to January. These results suggest that the main spawning activity of P. altivelis in Jeju streams occurs from October to November. The information about the reproductive characteristics of P. altivelis obtained in this study is critical to fishery management for this species.
Keywords
Sweet fish; Plecoglossus altivelis; Reproductive characteristic; Gonadosomatic index; Hepatosomatic index;
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