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International Journal of Fisheries and Aquatic Studies
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(ICV-Poland) Impact Value: 76.37, Impact Factor: RJIF 5.69
E-ISSN: 2347-5129, P-ISSN: 2394-0506

International Journal of Fisheries and Aquatic Studies

2015, Vol. 2, Issue 6, Part A

Maturity stages of ovary of a minor carp, Labeo bata (Hamilton-Buchanon, 1822)


Author(s): Kousik Roy, Dipak Kumar Mandal

Abstract: Histological studies of the ovary of a carp, Labeo bata demonstrate the annual events of its ovarian function. The month wise studies reveal that oogonial proliferation and recruitment of primary oocytes occur during resting (November-December) and preparatory phase (January- February). Ovarian growth is coincided with the enhancement of temperature and photoperiod from the month of March when oocytes are characterised with the inclusion of yolk vesicles and yolk granules. These oocytes are transformed to yolky mature follicles during maturation phase (April to May) and attain the maximum oocyte diameter during spawning phase (June to August) after germinal vesicle breakdown. Ovary undergoes regression with decline of water temperature during September-October. Hypertrophid granulosa cells take active part in resorption of yolky oocytes. The new oogonia appear only after complete resorption of yolky oocytes. This study shows that photo-thermal conditions are the major regulator of the ovarian function in L. bata.

Pages: 19-24  |  778 Views  15 Downloads

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How to cite this article:
Kousik Roy, Dipak Kumar Mandal. Maturity stages of ovary of a minor carp, Labeo bata (Hamilton-Buchanon, 1822). International Journal of Fisheries and Aquatic Studies. 2015; 2(6): 19-24.
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