Some Aspects Of The Ecology Of Barbus Amphigramma (Boulenger, 1908) In Lake Naivasha And River Malewa, Kenya

ABSTRACT

Some aspects of the ecology of Barbus amphigramma Boulinger 1908 which

included distribution and abundance, effects of physico-chemical parameters on the

species, growth parameters, food and feeding habits and reproduction in Lake

Naivasha and River Malewa were investigated using standard methods and

procedures. The study covered nine months from February to October 2003. There

was an overall influence of seasonal long rains in Lake Naivasha and River Malewa

on dissolved oxygen, chlorophyll a, pH and zooplankton abundance, which recorded

high levels during the months that coincided with the rains. Other parameters such as

temperature, conductivity, alkalinity, and secchi depth were highest during the

months that coincided with the dry season. B. amphigramma dominated the fish

species composition throughout the study period. There were significant differences

in the abundance of B. amphigramma in all the seven sites sampled (ANOV A, p