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http://dx.doi.org/10.5352/JLS.2020.30.12.1063

Phylogenetic Analysis of Carassius auratus and C. cuvieri in Lake Yedang Based on Variations of Mitochondrial CYTB Gene Sequences  

Kim, Gye-Woong (Department of Animal Resources Science, College of Industrial Sciences, Kongju National University)
Joe, Sung-Duck (Department of Animal Resources Science, College of Industrial Sciences, Kongju National University)
Kim, Hack-Youn (Department of Animal Resources Science, College of Industrial Sciences, Kongju National University)
Park, Hee-Bok (Department of Animal Resources Science, College of Industrial Sciences, Kongju National University)
Publication Information
Journal of Life Science / v.30, no.12, 2020 , pp. 1063-1069 More about this Journal
Abstract
Two crucian carp species (Carassius auratus and C. cuvieri) inhabit Lake Yedang in South Korea, and C. auratus is known to be native to Korea. Classification of these two freshwater fish species is often confused because of their morphological similarity. To distinguish the two species, we conducted phylogenetic and population genetic analyses of C. auratus and C. cuvieri based on their mitochondrial DNA sequences of the cytochrome b gene (CYTB). We also compared our partial CYTB sequence (<1,056 bp) with 10 Chinese, nine Japanese, and two Russian crucian carp fishes. The results of our phylogenetic analysis showed that C. auratus and C. cuvieri were clearly divided into two phylogroups. The nucleotide diversity (π) of C. auratus from Korea, China, and Japan showed a range of 0.146%~0.421%, while the range of π of C. cuvieri from Korea and Japan was lower than those of C. auratus (0.0%~0.054%). Moreover, the comparison of CYTB divergence among crucian carp fishes in China, Japan, and Korea indicated that Korean Carassius fishes were distantly related to those from China and Japan, with two exceptions: the pairwise Fst value between Korean C. auratus and northern Chinese C. auratus was not significantly different. In addition, no significant genetic divergence between Korean and Japanese C. cuvieri was detected. We conclude that, despite the morphological similarities, C. auratus and C. cuvieri should be considered as separate freshwater fish resources in conservation efforts for genetic diversity.
Keywords
Carassius auratus; C. cuvieri; CYTB gene; genetic diversity; phylogeny;
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