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Gonad maturation and spawning times of siganus sutor off the kenya coast evidence for definite spawning seasons in a tropical fish

, : Gonad maturation and spawning times of siganus sutor off the kenya coast evidence for definite spawning seasons in a tropical fish. Journal of Fish Biology 37(2): 315-326

The gond maturation cycle of Siganus sutor (Valenciennes, 1835) (Osteichthyes-Siganidae) is described for both males and females using macroscopic criteria for the testes and both macroscopic and microscopic ones for staging the ovaries. Siganus sutor has two major spawning seasons: one in January/February and the other in May/June. The presence of these seasons is established by (a) the temporal variations in the conditions factor and in the relative weight of the gonads, (b) the progression of peaks of maturity stages with seasonal occurrence of spent fish in the samples, and (c) the seasonal appearance of juveniles. This is a significant result for a tropical marine fish.


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