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http://dx.doi.org/10.35399/ISK.33.2.5

Inhabitat Status and Gastric Contents of Invasive Fish Species and the Effect on Fish Fauna at Three Reservoirs in National Parks of Korea  

Park, Seung-Chul (Korea National Park Research Institute)
Lee, Kwang Yeol (Environmental Research Institute Kangwon National University)
Choi, Kwang-Seek (Kosoo Ecology Institute)
Han, Mee-Sook (Kosoo Ecology Institute)
Ko, Myeong-Hun (Kosoo Ecology Institute)
Publication Information
Korean Journal of Ichthyology / v.33, no.2, 2021 , pp. 84-94 More about this Journal
Abstract
This study was conducted to elucidate the impact of invasive species, Micropterus salmoides and Lepomis macrochirus in Geumgyeji, Samgaji and Naejangji reservoirs of National Parks, Korea in 2020. In the Geumgyeji, 1,221 individuals of 11 species in 7 families were collected including M. salmoides (relative abundance, 96.3%) and L. macrochirus (0.3%), M. salmoides fed mainly on Rhinogobius brunneus (IRI, 37.2%), Odonata (25.6%), Megaloptera (11.6%), and M. salmoides (7.0%). In the results of Samgaji showed that 854 individuals of 10 species in 5 families were collected including M. salmoides (60.8%), and M. salmoides fed mainly on Decapoda (shrimp, 33.6%), Odonata (34.4%), R. brunneus (21.2%), and Zacco platypus (6.1%). In the Naejangji showed that 1,075 individuals of 13 species belonging to 7 families were collected including L. macrochirus (38.1%) and M. salmoides (9.5%), and L. macrochirus fed mainly on Branchiopoda (77.5%), Diptera (9.8%), Decapoda (4.0%) and M. salmoides fed mainly on R. brunneus (73.3%), Decapoda (21.2%). M. salmoides of Geumgyeji and Samgaji were apparently introduced more than a 10 years ago. The fish population declined rapidly since the introduction of M. salmoides. L. macrochirus of Naejangji was introduced more than 20 years ago, which increased its relative abundance to 40%. M. salmoides was introduced five to six years ago, and the fish species and population declined rapidly since the introduction of M. salmoides. Finally, we discussed the inhabitat status and management of M. salmoides and L. macrochirus in the National Park.
Keywords
Micropterus salmoides; Lepomis macrochirus; invasive species; fish fauna; National Park;
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