The triploid and tetraploid specimens of the Japanese common lach,
Misgurnus anguillicaudatus, were detected among 13 individuals obtained from the Chinai river of Shiga prefecture and 67 specimens from the market. One polymorphism due to the Robertsonian fusion was found in a population of diploid specimens. The DNA values in individual nuclei of liven cells from diploidy, triploidy and tetraploidy were estimated through the Feulgen cytophotometry (Olympus DMSP-1). The DNA value of tetraploidy was about twice that of diploidy, and that of triploidy was intermediate between diploidy and tetraploidy.
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