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Karyotypic diversity between rainbow trout (oncorhynchus mykiss, walbaum) and snow trout (schizothorax richardsonii, gray)

Authors : Satesh Vasave,Amita Saxena,S. K. Srivastava

The Cytogenetic studies were carried out in two important coldwater fishes, Rainbow trout (Oncorhynchus mykiss) and Snow trout (Schizothorax richardsonii), by Giemsa staining. The diploid chromosome number (2n) in Rainbow trout (Oncorhynchus mykiss) the modal diploid number was found to be 2n = 60. The karyotype formula obtained consist of 38 metacentric (M), 6 submetacentric (Sm) and 16 telocentric chromosomes (24M + 20 Sm + 16 T).  The fundamental arm number was derived to be 208 (FN = 208) and in Snow trout (Schizothorax richardsonii), the modal diploid number was found to be 2n = 96. The karyotype formula obtained consist of 18 metacentric (M), 16 submetacentric (Sm) and 12 subtelocentric and 50 telocentric chromosomes (18 M + 28 Sm + 50 T). The fundamental arm number was derived to be 284 (FN = 284). This is the attempt to compare the wild snow trout obtained from Himalayan stream and farm raised Rainbow trout in these species using conventional staining. [Full Article]

Keywords : Rainbow trout , Snow trout , karyotype

Published in : Journal of Plant & Agriculture Research

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