Chromosomal studies on a threatened fish Cyprinion semiplotus (Teleostei: Cyprinidae) from Arunachal Pradesh

Sahoo Prabhati Kumari, . and Nanda Prasanta, . and Barat Ashoktaru, . Chromosomal studies on a threatened fish Cyprinion semiplotus (Teleostei: Cyprinidae) from Arunachal Pradesh. pp. 501-504. ISSN 0116-6514

Cyprinion semiplotus (McClelland) (Fam: Cyprinidae) also known asAssamese Kingfish is a minor carp that occurs naturally in the Hill Rivers of North East India. This species is recognized as threatened as its occurrence has declined considerably in the rivers of Arunachal Pradesh in recent times. Hence the present study is undertaken to establish base chromosomal data for application in future conservation measures. Five live specimens were collected from a tributary of River Dikrong near Itanagar Arunachal Pradesh. Samples were processed for chromosome preparation using a colchicine- KCl flame drying method (Khuda Bukhsh Manna 1976). The diploid chromosome number (2n) for C. semiplotus was ascertained to be 50. The karyotype consisted of 12 metacentric 8 submetacentric 8 subtelocentric and 22 telocentric chromosomes with a fundamental arm number (FN) 70. No sex chromosomes could be identified. This is the first report of a karyotype for Cyprinion semiplotus. The possible evolutionary significance of chromosome number is discussed.

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Abstract

Cyprinion semiplotus (McClelland) (Fam: Cyprinidae) also known asAssamese Kingfish is a minor carp that occurs naturally in the Hill Rivers of North East India. This species is recognized as threatened as its occurrence has declined considerably in the rivers of Arunachal Pradesh in recent times. Hence the present study is undertaken to establish base chromosomal data for application in future conservation measures. Five live specimens were collected from a tributary of River Dikrong near Itanagar Arunachal Pradesh. Samples were processed for chromosome preparation using a colchicine- KCl flame drying method (Khuda Bukhsh Manna 1976). The diploid chromosome number (2n) for C. semiplotus was ascertained to be 50. The karyotype consisted of 12 metacentric 8 submetacentric 8 subtelocentric and 22 telocentric chromosomes with a fundamental arm number (FN) 70. No sex chromosomes could be identified. This is the first report of a karyotype for Cyprinion semiplotus. The possible evolutionary significance of chromosome number is discussed.

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Item Type:	Article
AGROVOC Term:	Cyprinidae
AGROVOC Term:	Carp
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Chromosomes
AGROVOC Term:	Chromosome number
AGROVOC Term:	Drying
AGROVOC Term:	Evolution
AGROVOC Term:	Research
AGROVOC Term:	Techniques
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7907

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