Effect of unilateral eye stalk ablation (ULEA) on Gonadosomatic Indices and Gonad Maturation of Freshwater Crab, Paratelphusa hydrodromous (Henderson 1893)
Shabnam Banoo, Showkat Hussain Rather, Mohd Waseem
Present study was carried to investigate the effects of ULEA on gonadal maturation of both sexes of field crab, P. hydrodromous. Experimental animals were collected from Campus of Barkatullah University, Bhopal Madhya Pradesh, India. Apparently 30 males and 30 females were selected for investigation. For experiment, two groups were arranged viz., control group for male and female (with intact eyestalk) and experimental group of both males and females (eyestalk ablated). Animals were maintained in fibre tubs and were reared during the course of experiment (45days). After the completion of the study, animals from both groups were scarified for the respective gonads i.e., testes in males and ovaries in females. Values of GSI in both the sexes in experimental group are much higher than that of control group (with intact eyestalk). On the basis of histological study, in control male group revealed that the testes reached up to the formation of spermatocytes and spermatids and control female ovaries showed presence of oocytes in initial vitellogenesis. On the other hand, the experimental male gonads showed spermatids and spermatozoans and experimental female ovaries showed presence of oocytes in advance vitellogenisis that is secondary oocyte stage and post vitellogenic oocytes also. “t” test revealed significant difference between the GSI of control and experimental group.