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Spawning Characteristics of an Endangered Freshwater Fish Microphysogobio koreensis (Pisces: Gobioninae) in the Semjingang (river) from Korea  

Park, Jong Sung (Inland Aquaculture Research Center, National Institute of Fisheries Science)
Kim, Hyeong Su (Inland Aquaculture Research Center, National Institute of Fisheries Science)
Park, Jong Young (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.29, no.4, 2017 , pp. 261-266 More about this Journal
Abstract
Microphysogobio koreensis is an endemic Korean freshwater fish that is protected as an endangered fish by the Ministry of Environment in Korea. In this study, we attempted to investigate the spawning period and spawning characteristics of M. koreensis to obtain basic information for its conservation. Though natural and histological observation, the spawning season occurred between April and May, with peak spawning occurred in early May when the water temperature was $20{\sim}23^{\circ}C$. During the spawning season, males had a bright-orange body and a thick red horizontal line from the rear of the operculum to the caudal peduncle, along with a lateral line, while females had a dark brown body. Nuptial organ had not appeared. The number of eggs in the ovaries was 10,705~22,165 ($15,573{\pm}4,274$). The number and appearance ratio of mature eggs were 1,100~5,920 ($3,383{\pm}2,126$) and 10.3~44.8% ($22.4{\pm}15.6$), respectively. And the size of mature eggs was 0.60~1.00 mm ($0.74{\pm}0.06$).
Keywords
Microphysogobio koreensis; spawning period; spawning characteristics; nuptial color;
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Times Cited By KSCI : 9  (Citation Analysis)
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