Studies on the origin of exotic loaches and their impact on indigenous species

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Loaches collected in Japan and adjacent area were genetically characterized by chromosome observation, genome size estimation and sequence analyses of mitochondrial and nuclear DNA markers. As a result, Japanese market samples were genetically identical or very similar to those distributed in China. As artificial inter-specific hybrids between indigenous loach and exotic mud loach species exhibit fertility in females, genetic contamination is worried in Japanese wild populations.