Abstract
The reproductive cycle of Mormyrus kannume Forsk. was studied for one year, at two locations near the equator in Lake Victoria. Samples taken on a typical feeding‐ground indicate that the species is monoestrous; ripe specimens being found from November to January, maturation taking place gradually over the remaining nine months of the year. Samples taken at a typical spawning‐ground, however, contain ripe fish over a prolonged period, from October to May and possibly June, and the period available for maturation is correspondingly short. The difference in the reproductive cycles at the two localities appears to be the result of successive waves of immigration to the spawning ground by different populations within the lake, each having a 12‐month annual cycle, but not in phase with each other.
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