Changes in life history characteristics of Nile perch and their implications on the future of its fishery in Lake Victoria
2001
Ogutu-Ohwayo, R.
The type of prey eaten and the life history characteristics of Nile perch in Lake Victoria and other lakes (Kyoga and Nabugabo) to which the predator was introduced have been monitored since the predator was introduced in these lakes and compared with the situation in its original habitat of Lake Albert. As the types of prey eaten in Lake Victoria changed from haplochromines, to Caridina nilotica, Rastrineobola argentea, Nile perch juveniles the condition factor of the predator decreased from 1.4 in 19605 to 1.2 in 1990s which is lower than 1.3 recorded in its native habitat of Lake Albert. The size at first maturity of females has increased from 30-40 cm for males and 50-59 cm for females to 40-50 for males and 80-100 for females, which is similar to that for Lake Albert. The proportion of females to males in the population decreased from an almost equal number of females to males (85 -100 females to 100 males) and. are now males biased (23-65 females to 100 males).
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