Impact of Largemouth Bass (Micropterus salmoides)on the Population of Korean Native Fish,Crucian Carp (Carassius auratus)

摘要: Exotic species in aquatic ecosystem generate various problems domestically as well globally. Largemouth bass (Micropterus salmoides) which is a well-known exotic globally, acts substantial disturbance factor on the native fish communities Korea due to high predation pressure and hence designated ecologically harmful by Ministry of Environ- ment. In this study, we investigated impact largemouth Korean population, crucian carp (Carassius auratus), identify responses prey fish. Two were col- lected at seven reservoirs distributed Nakdong River catchment area, changes length- frequency length-weight relationship (LWR) analysed depending existence large- mouth bass. At absent sites, ratio under age 1 year individuals small, over two years dominant. Conversely, normal length-frequency distribution pattern was identi- fied sites. The LWR (fish smaller than total length 160 mm only considered it frequently consumed predation) different upon existence. value parameter b 2.909, that present reservoirs, 3.100. Our results imply reser- voirs presented strategy survive from bass, through relatively rapid growth. We propose other might have similar growth strategies like carp.