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Study of Mitotic Chromosomes of Four Fresh Water Carps from Bangladesh

M. A. Zaman
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Masuda Khatun
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Nazrul Islam
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

Four fresh water carps from Bangladesh were cytologically studied. These were (i) Labio rohita, 2n = 50 (ii) Catla catla, 2n = 50, (iii) Cirrhina mrigala, 2n = 50 and (iv) Hypophthalmichthys molitrix, 2n = 48. Mitotic chromosomes were studied from gill and kidney cells of both male and female fishes. While studying chromosome formulae and total length of the chromosomes (TLC) it was found that there was a little difference only between the sexes of the same species. Though the 2n number of all the species of the present report agree with the reports available from abroad yet in the details of the karyomorphometric features wide variation was found.

Keywords: Fresh water, Carps, Fishes

Location: Fisheries department at Adamjee, Narayanganj and Dhaka.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Carp fish

Objectives:

To study the cytogenetics the major carps of Bangladesh.

Methodology:

Four carp fishes, namely (i) Catla catla Hamilton-Buchanan (Katla), (ii) Labio rohita Hamilton-Buchanan (Ruhit), (iii) Cirrhina mrigala Hamilton-Buchanan (Mrigel) (iv) Hypophthalmichthys molitrix (Silver carp) were selected as study materials. Of these excepting the fourth one all are indigenous species. The fourth one though exotic is now quite widely distributed and used throughout the country. Live fishes were collected from the hatchery of Fisheries department at Adamjee, Narayanganj and Dhaka. These were kept in small tanks in the Botanical Garden, University of Dhaka. The fishes were identified with the help of the Department of Zoology, University of Dhaka. For the study of mitosis, procedure of Ojema was followed. Chromosomes from the kidneys of colchicenized fishes were prepared through citrate-acetic alcohol-flame drying technique and stained by Giemsa following Manna and Prashad's specification. The metaphase chromosomes were analyzed karyomorphometrically according to the procedure of Levan et al. (1964) after the preparation of karyotype and idiogram. The 2n chromosome number was determined by analyzing at least 10 well spreaded cells from the kidney and the gill of both the males and the females of each of the species.

Source of Information: Bangladesh J. Sci. Res. 13(2) : 197-204, 1995 (December), ISSN: 0253-5432

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the four fresh water carps the same chromosome numbers were found in the gills and the kidney cells. The total length of the somatic complements (TLC) was also measured which showed that two male fishes (L. rohita and C. catla) had larger TLC and two female fishes (C mrigala and H. molitrix) had larger TLC. While studying chromosome formulae and total length of the chromosomes (TLC) it was found that there was a little difference only between the sexes of the same species. Though the 2n number of all the species of the present report agree with the reports available from abroad yet in the details of the karyomorphometric features wide variation was found.

Knowledge Management: Journal