Three of the five major species ofcatfishes in Lake Victoria displayed continuous, protracted (fractional) spawning activity with half or more of the population in gonadal stages IV-VI.Pulses in reproductive activity occurred in all species and were generally positioned between the established, rainy seasons for East Africa. Although highly variable, relative fecundity was positively correlated with body length and weight of fish in all species. All five species matured sexually between their first and third year of life.
Movement of the introduced Tilupiu spp. in the Nyanza Gulf of Lake Victoria is largely random, however, mobility has a strong correlation with dry and rainy seasons. The seasonal pattern of movement may be attributed to the response of the species to spawning and feeding drives and favourable living areas. Tilupiu movements were typically short (< 1 km) and there were no systematic shifts in centres of gravity of populations.
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