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Analysis of Gonadosomatic Index (GSI) and Sexual Dimorphism of Coreoleuciscus splendidus in Age Groups  

Song, Ha-Yoon (Inland Fisheries Research Institute, NIFS)
Kim, Kyeong-Mu (Inland Fisheries Research Institute, NIFS)
Shin, A-Ri (Inland Fisheries Research Institute, NIFS)
Lee, Jin-Seok (Inland Fisheries Research Institute, NIFS)
Park, Hee-Won (Inland Fisheries Research Institute, NIFS)
Lee, Wan-Ok (Inland Fisheries Research Institute, NIFS)
Publication Information
Korean Journal of Ichthyology / v.29, no.3, 2017 , pp. 176-189 More about this Journal
Abstract
Age estimation and sexual dimorphism of Coreoleuciscus splendidus were estimated using otolith, length-frequency distribution and 23 morphological measurements, from 245 individuals collected from September 2016, February and April 2017 in the Gapyeong stream, Han River, Korea. Result of age estimation of C. splendidus, we most examined were 2, 3 and 4-age, and the maximum observed ages were 5-age. Nine out of twenty-three morphometric measurements were significantly different between the genders. Anal fin have showing major sexual dimorphism in particular between adult individuals. This sexual dimorphism was based on extension of anal fin soft rays of male individuals. Therefore anal fin of males is always longer and wider than females. During spawning season male individuals possess nuptial tubercles on anal fin rays. However, another measurements and morphological characters does not exhibit sexual dimorphism in the between male and female individuals. The sexual dimorphism was observed to only over 2-years old individuals with sexual maturity. But juvenile and 1-years old individuals do not have sexual dimorphism with sexual maturity. Peak season of spawning was April to May and they start first spawning at 2-age. The ages at major spawning groups were most 3-age, and they maximum GSI index was 14.91 (female), 8.96 (male) at 5-age, respectively.
Keywords
Coreoleuciscus splendidus; sexual dimorphism; otolith; GSI index; age estimation;
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