Karyomorphological studies in three species of teleostean fishes.

Abstract

The karyomorphometrical analysis of somatic chromosomes of females of three species (vide infra) presented in this paper seemed not to have been carried out prior to our preliminary report (Khuda-Bukhsh and Manna 1974 a , b). Materials and methodsThree living specimens each of Mystus gulio (Fam: Bagridae), Eutropiichthys vacha (Fam: Schilbeidae) and Mastacembelus armatus (Fam: Mastacembelidae) were intramuscularly injected with 0.1% colchicine solution at the rate of 2ml/100 gm of body weight. After 5 hours their kidneys were separately removed into 1 sodium citrate solution, minced and flushed repeatedly to bring the cells into suspen sion. Cytological preparations were made according to the acetic alcohol-flame drying-Giemsa technique.The arm ratio and centromeric indices of metaphase chromosomes were determined following Levan et al. (1964) on which the morpho logical types and the chromosome formulae were assigned.Results

Karyomorphology of Three Indian Major Carps From Haryana, India

“…It may be due to mechanism of centric fission. Centric fission seemed to have played a significant role in evolution of teleost fishes (Manna and Khuda-Bukhsh, 1978). Different groups of fishes exhibit different processes of karyotype evolution.…”

“…All these studies have shown the diploid number as 50, confirming the present results. According to Manna (1984) and Rishi (1989) the most commonly occuring diploid number in family Cyprinidae is 50, considered to be the modal number of this species. Presence of same modal number in the present studies reinforces the hypothesis that Indian major carps are karyologically very conserved and represent plesiomorphic condition.…”

Chromosomes of four Indian marine catfishes (Bagridae, Ariidae: Siluriformes) with a heteromorphic pair in maleMystus gulio

“…1982. In India both freshwater and marine catfish representatives of about 12 different families of Siluriformes are available and the chromosomes of a few of them have been studied by NAYYAR (1966), SRIVASTAVA andDAs (1968, 1969), PRASAD (1971, 1974), NANDA (1972), R.Ism (1973), R.ISHI and SINGH (1983, NATARAJAN andSUBRAHMANYAM (1974), DAS andKAR (1977), MANNA and KHUDA-BUKHSH (1978), TRIPATHY and DAs (1980), KHUDA-BUKHSH and BARAT (1987). Some of such reports show variation in the morphology of the chromosomes and even in the diploid number in the same species, which warrant reinvestigation before drawing any inference.…”

“…The chromosomes of M. gulio have been previously studied by NATARAJAN andSuBRAHMANYAM (1974), MANNA andKHUDA-BUKHSH (1978) (Table 3). Both the groups have reported 2n =58 but all the chromosomes, according to the former, are biarmed whereas, the latter claims 22 pairs of biarmed and 7 pairs of acrocentrics.…”

New developments in vertebrate cytotaxonomy III. Karyology of bony fishes: A review

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