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Population Structure of Bluegill, Lepomis macrochirus in Lakes of the Han River System, Korea  

Song, Ho-Bok (Korea Freshwater Fish Research Institute)
Byeon, Myeong-Seop (Han River Environmental Research Center, National Institute of Environmental Research)
Kang, Dong-Won (Korea Freshwater Fish Research Institute)
Jang, Chang-Yeol (Korea Freshwater Fish Research Institute)
Moon, Jeong-Sook (Han River Environmental Research Center, National Institute of Environmental Research)
Park, Hae-Kyung (Water Environment Research Department, National Institute of Environmental Research)
Publication Information
Korean Journal of Ichthyology / v.24, no.4, 2012 , pp. 278-286 More about this Journal
Abstract
This study was examined for information of management of bluegill, Lepomis macrochirus which is disturbance species of underwater ecosystem in Korea. Research of bluegill population was investigated spring-summer and autumn periods in the Han river system from 2009 to 2012. Bluegill inhabited mostly lakes, and restrictedly lived at still area in downstream. The range of relative abundance were 0.2~18.2% in individual number and 0.2~40.0% in biomass and it was subdominant or superiority species for the most part of the lakes. Population structure were analyzed r-strategy in Lake Soyang and Paldang and K-strategy in Lake Uiam and Cheongpyeong. But Lake Chungju was estimated transition period from K-strategy to r-strategy. Condition factor and body weight-total length relations were presented favorable condition. For the nesting, bluegill was formatted the group. And the water depth and the distance from shore were mean 56.3 cm and 191.9 cm respectively in nesting ground. Diameter and depth of nests were mean 42.4 cm and 9.7 cm respectively. These results are available for research of population dynamics and reproductive ecology of bluegill.
Keywords
bluegill nest; condition factor; Han river system; Lepomis macrochirus; population structure;
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