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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Mar 2009, 29 (2)                                     Back


Ovarian development in Labeo dyocheilus (McClelland) during active

Ovarian 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, College of Fisheries, G.B. Pant University of Agriculture and Technology,

Pantnagar-263 145, India

2National Bureau of Fish Genetic Resources, Canal Ring Road, Dilkusha, Lucknow-226 002, India

(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)

 

 

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