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Periophthalmus barbarus (n= 600) sampled over a twelve month period (February 2008 – January 2009) in New Calabar River Nigeria was analyzed for their breeding activities. The length at which 50% of the samples matured was 10.2cm for females and 10.8cm for males. Absolute fecundity was 860-13852 with a mean of 4400.25±545.34. A relative fecundity of 90.53/cm to 1154.16/cm with a mean of 421±45.87 was also observed. The annual sex ratio was 1:1.4 (female: male). The seasonal sex ratio showed male dominance in the wet season but even in dry season. Spawning occurred all year round, with peak from February to July. Hepatosomatic index (mean values 1.24±0.061 and 1.38±0.089 for females and males respectively) and gonadosomatic index (mean values 1.72±0.142 and 0.23±0.027 for females and males respectively) presented monthly variations which suggested changing feeding and reproductive activities.

Reproductive biology of Periopthalmus barbarus (Linneaus 1766 ) in new Calabar River, Nigeria