From deck samples in 1974-1975 in the industrial fishery of Lake Tanganyika in Tanzania, we determined total catch, length frequencies, and sexual maturity of Luciolates stappersi. Bimodality developed in lengths of juveniles, but adult lengths formed single modes or very weak double modes. Monthly modal progressions of juveniles indicated growth series originating in March and December. Each year one age-group dominates the catch, becoming most abundant early in the calendar year, the reproductive season. After the spawning period, catches decline sharply, either from spawning-related mortality or behavior which makes the year class less vulnerable to exploitation. Adults grow at about 0.7 cm per month. Sexually ripe adults appeared in purse-seine catches year-round, but more females appeared in advanced maturity in November-February and August. Our data fit well with those from other studies of Luciolates, except that the latter suggest a longer life span.
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