Length-Weight Relationship and Condition Factor: Economic Impacts of Dominant Fish Species Along the Asaba Axis of the River Niger

This research evaluated the growth dynamics and economic relevance of major fish species harvested from the Cable–Ogbeogonogo section of the River Niger in Asaba, Delta State, Nigeria. Morphometric measurements were obtained from sampled fish specimens, while structured questionnaires were administered to 200 stakeholders engaged in fishing and fish marketing. The analysis of length–weight relationships showed that Tilapia zillii exhibited near-isometric growth (b = 3.08), whereas Clarias macromystax demonstrated positive allometric growth (b = 3.21). Condition factor values above unity indicated that the populations were physiologically stable within the study environment. An income analysis revealed higher average monthly earnings among active fishers (₦124,500) compared to fish vendors (₦98,300). Despite viable returns, operational challenges such as fuel costs and inadequate cold storage affect profitability. The findings provide empirical data useful for fisheries monitoring and sustainable resource management in the Lower Niger Basin.