Karyotypic variation in Japanese rosy bittering, Rhodeus ocellatus kurumeus (Jordan and Thompson)
1995
Kawamura, K. (National Research Inst. of Aquaculture, Tamaki, Mie (Japan)) | Hosoya, K.
The karyotype of the endangered Japanese rosy bittering, Rhodeus ocellatus kurumeus was analyzed as one of the basic studies for preservation. The chromosome number was constantly 2N=48 in all materials. The karyotype of Yao population was composed of 18 metacentrics (M), 10 submetacentrics (SM) and 20 subtelocentrics (ST), while that of Yanagawa population 14 M, 14 SM and 20 ST. By the silver banding technique, nucleolar organizer regions (NORs) were recognized in one pair of the second largest ST regardless of localities. The karyotype of another subspecies R. ocellatus ocellatus from the Yodo River seems to be different from that of R. ocellatus kurumeus in the karyotype. There could also be a possibility considered, that R. ocellatus ocellatus from the Yodo River was not genetically pure, but hybrids between two subspecies of R. ocellatus or their offspring
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