Evaluating growth and exploitation of Tylochromis jentinki in Ikere Gorge: implications for fisheries management

Abstract

The present study investigated the growth dynamics, mortality rates, and exploitation patterns of Tylochromis jentinki in Ikere Gorge, Nigeria, to assess its sustainability and contribution to local fisheries. Length-frequency data were collected over two years and analyzed using the ELEFAN I and II methods. The results revealed an asymptotic length of 35.70 cm, a growth coefficient of 1.2 year-1, and a high growth performance index, indicating rapid growth but a short lifespan of approximately 2.5 years. The species exhibited two distinct recruitment periods annually, with a high exploitation rate which may suggest overfishing. The study recommended implementing management strategies, such as size limits and seasonal closures during recruitment peaks, to ensure sustainable exploitation. Protecting fish until they reach reproductive maturity is crucial for the long-term viability of T. jentinki populations in Ikere Gorge.