Chromosome study on three species of silurid fishes, Kryptopterus cryptopterus, K. bleekeri and Ompok bimaculatus, of Thailand
1991
Thawat Donsakul (Srinakharinwirot Univ. Bangkhen Campus, Bangkok (Thailand). Faculty of Science)
Main purpose of this experiment was to study the chromosome and karyotype of Kryptopterus cryptopterus, K. bleekeri and Ompok bimaculatus of Thailand. Fifteen specimens of each species of fishes, 10.1 to 10.5 cm, 10.6 to 13.8 cm and 17.8 to 21.5 cm in standard length were studied respectively. Method of chromosome preparation was modified from Ida and Kyo (1980), Denton (1973) and Uwa and Ojima (1981). Classification of chromosome followed the method recommended by levan et al. (1964). The findings of this experiment were as follows: 1) The diploid chromosome number of K. cryptopterus is 92. The karyotype comprises 4 pairs of metacentric, 5 pairs of subtelocentric and 37 pairs of acrocentric chromosome. The arm number is 100. 2) The diploid chromosome number of K. bleekeri is 64. The karyotype comprises 10 pairs of metacentric, 3 pairs of submetacentric, 1 pair of subtelocentric and 18 pairs of acrocentric chromosomes. The arm number is 90. 3) The diploid chromosome number of O. bimaculatus is 50. The karyotype comprises 17 pairs of metacentric, 1 pair of submetacentric, 1 pair of subtelocentric and 6 pairs of acrocentric chromosomes. The arm number is 86. The findings of this experiment revealed that the chromosome number and pattern of karyotype of 3 fishes are different.
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