Abstract
© Zoo Outreach Organisation; www.zoosprint.org Manuscript 1316; Received 12 January 2005; Finally accepted 20 March 2005; Date of publication 21 August 2005 1989 Sex ratio indicates the comparison of number of males and females in a population. An understanding of the sex ratio in a fish in different months and seasons is essential for obtaining information on seasonal segregation of the sexes and their relative abundance in spawning season. It reveals the differential growth of the two sexes also. It is an indicator of population behaviour and fecundity according to Panthulu (1961). Many workers like Sobhana and Nair (1976), de Silva and Kortmulder (1977), Prem Kumar and Subramanian (1984), Islam and Hossain (1990), Kumar and Siddiqui (1991), and Reddy and Rao (1992) studied the sex ratios in fresh water fishes. In natural environment the optimum sex ratio is 1:1, but it may be far from this in particular age and size group. In the younger groups, the males predominate because they tend to mature earlier than females.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
