Ovarian Biology of Spotted Snake head (Channa punctatus) from Natural Wetlands of Sylhet, Bangladesh

2016-08-16T19-20-02Z
Source: Annals of Veterinary and Animal Science
Hossain MA, Mian S, Akter M, Rabby AF, Marine SS, Rahman MA, Iqbal MM, Islam MJ, Hassan MM, Hossain MM.
A year round series of intensive investigations were carried out with the quest to comprehend the reproductive biology and ovarian development of spotted snakehead Channa punctatus, scooped up from wild habitat from December, 2012 to November, 2013. Biometrics and morphometrics like length-weight relationship, gonadosomatic index (GSI), hepato-somatic index (HSI) and absolute fecundity were estimated over the study period. Beyond these, gonadal histology was executed for better assessment of ovarian maturity. Length-weight relationship showed positive allometric relation and found to be strongly correlated (r2=0.912). On the other hand, positive linear relationship were also observed between fecundity and body weight (r2=0.771); and the oocytes number and weight of ovary (r2=0.834). An inverse relation was observed between GSI and HSI. Highest GSI was observed in July (5.64±1.24) and lowest in May (0.194±0.054). Whereas highest HSI were noted in January (1.65±0.46) and lowest in July (0.195±0.054). The estimated highest absolute fecundity (26294±416.74) were recorded in July, with an average value of (10353.7±797.62) over the year and large C. punctatus tend to have greater number of oocytes compare to smaller fishes. Histological observations of ovary stained with haematoxyline & eosin (H-E) revealed that early and developing stages of oocytes were mostly observed during the months of March to May, maturing in June to July, while mature oocytes during July to August. Presence of mature oocytes in ovary in July to August indicated mature phase of ovary ready to spawn. Higher GSI values during June to August with lower HSI and highest absolute fecundity (July) along with the observation of ovarian histology throughout the year summarizes that C. punctatus breeds during the months of July to August


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