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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Mar 2009, 29 (2) BackOvarian development in Labeo dyocheilus (McClelland) during active reproductive phase under captive and
wild conditions Ajeet Singh1, I.J. Singh*1, R.N. Ram1 and B. Kushwaha2 1Department
of Fishery Biology, Pantnagar-263
145, 2National
Bureau of Fish Genetic Resources, (Received: June 09, 2005
; Revised received: August 17, 2006 ; Accepted: September 09, 2006) Abstract: Ovarian
development in Labeo dyocheilus
was assessed during active reproductive phase under ambient environmental
conditions in captivity and wild. Increasing day length and water temperature
seemed favourable for ovarian development in female
L. dyocheilus under both conditions. Gonadosomatic index (GSI) was lower in May and higher in
July in captivity (6.168
and 13.366) and wild (5.798
and 16.166 ) respectively. Ovarian development started little bit in
advance in captivity with late yolk vesicle stage oocyte
in May when yolk globule stage oocytes were prominent
in wild. Fully grown oocytes with germinal vesicle
migration (GVM) and germinal vesicle breakdown (GVBD) stages were observed in
July in both conditions. Degree of transformation of developing oogonials into advance stage oocytes
was observed to be better in wild fish compared to captivity reared ones. The histophysiological changes in liver corresponded well to
the progression of ovarian development. Successive granulation and
vacuolization of hepatocyte cytoplasm were indicative
of augmented synthetic activity and probably mobilization of energy content for
oocyte growth. These observations indicated that
normal ovarian development of L. dyocheilus under
captivity in Tarai region of Uttarakhand
would be useful for success of its seed production in captivity for stock
augmentation in wild or species diversification in aquaculture. Key words: Ovary, Liver, Day length, Temperature, Labeo dyocheilus, Hepatosomatic Index, Gonadosomatic
index PDF of full length paper is available with author (singhij2@gmail.com) Copyright
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