Certain aspects of Reproductive Biology of Glossogobius giuris (Hamilton –Buchanan) from Upper Assam
- Author Santoshkumar Abujam
- Co-Author Monjeet Sonowal, Shyama Prasad Biswas
- DOI
- Country : India
- Subject : Zoology
Keywords : Glossogobius giuris, Reproductive biology, Spawning, Upper Assam
Abstract
The present study has been carried out from the fish landing sites of Brahmaputra River at Guijan Ghat and Hilika Ghat (downstream of Maguri beel), Tinsukia district of Assam during March, 2015 to February 2016. A total of 144 Glossogobius giuris specimens comprising of 94 males and 50 females were used for this analysis. Sexual dimorphism reveals that the males were straight, slender and pointed genital papilla and females were short, fleshy and circular genital papilla. The overall sex ratio (M:F) of the examined fish was recorded 1:0.53. Gonadosomatic ratio value for male was ranged from 0.2±.02 (December) to 0.81±1.03 (May) and for female from 0.812±.08 (December) to 5.8±.01 (June). The average absolute fecundity was ranged from 5,124±1342 to 15289±1245 and the relative fecundity from 631.03 to 931.69. The highest fecundity was observed in June and lowest in February. It reveals that the G. giuris has long spawning period from March to September and their peak being in June. The ova diameter was ranged from 0.12 to 0.50 mm and the average value of egg size was varied between 0.20±0.04 (February) and 0.36 ± 0.13 mm (June-July). The size of the ova was gradually increase from February onwards and being peak in June.
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