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Studies on some aspects of Reproductive biology of Amblypharyngodon mola (Hamilton-Buchanan, 1822)

Author Affiliations

  • 1 Aquaculture Research Unit, Dept. of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, WB, INDIA


Study of reproductive biology of any fish species is important to get information for successfully continuing its culture. Amblypharyngodon mola is a popular food fish as well as at present a good ornamental fish in India; but except the work of Ravi Shankar and Sarala (1986) no such detail work has been performed till date on reproductive biology of this fish species in the context of agro-climatic condition of India. So, the present work has been conducted to study some aspects of reproductive biology of Amblypharyngodon mola. Sex-ratio, length at first sexual maturity, cycle of gonadal maturation and spawning periodicity has been studied as part of this study. Monthly variation in sex ratio has been studied after counting the total number of two sexes in the monthly collected samples. Length at first sexual maturity has been determined following the length class in which at least 50% of the fish specimens have been observed to be matured. Cycle of gonadal maturation has been studied by macroscopic and microscopic observation of the different maturation stages of gonad. Spawning periodicity has been determined studying the monthly Gonado-Somatic-Index, Condition Factor and mean monthly ova-diameter. Frequency distribution of different size groups of intra ovarian oocytes has been studied on monthly basis to get the information on the type of oocyte development. The results of the study have revealed female dominance over male in the population but males have shown earlier maturation than females. The breeding season for this fish species has been observed to extend from April to December with two spawning months in June and November respectively. Fractional spawning behaviour along with asynchronous oocytes development has also been observed.


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