Changes in condition and maturation of the Oreochromis niloticus L. population of Ferguson's Gulf, Lake Turkana, Kenya

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Abstract
The condition and maturation of the Oreochromis niloticus population of Ferguson's Gulf, Lake Turkana was assessed in light of the declining lake level and compared with similar data taken at the high lake level period 10 years ago. Results show a dramatically lower length/weight relationship and an earlier length at maturity for the 1980s population. A defined breeding period was seen for the 1980s population, unlike in the 1970s, perhaps in response to stressful conditions. The reduction in area of the Ferguson's Gulf breeding/nursery grounds is suggested as the major factor contributing to stress in the O. niloticus population, and it is suggested that measures be taken to protect what is left of these breeding/nursery areas.