Evaluation of Fecundity in Open Field Ponds and Polythene-Covered Ponds of Oreochromis aureus and Oreochromis niloticus in the Kenyan Highlands during the Warm Months from September to December

The major objective of the study was to evaluate the fecundity of Oreochromis aureus and Oreochromis niloticus reared in open field ponds and polythene-covered ponds in the Kenyan Highlands during the warm months (September to December). The study investigated the importance of different bio-systematic pond environments on the fish fecundity, while taking into account temperature variations and other pond bio-physio-chemical parameters. Fish were stocked in hapas within a polythene-covered ponds (PCP) and in open field ponds (OFP). Data was collected for fingerling production, monthly fecundity percentages, and correlation coefficients between fecundity and various bio-physio-chemical parameters (pH, conductivity, temperature, dissolved oxygen, atmospheric pressure, pond water pressure and midnight temperature). The study indicated significant variations in fingerling production across months, environments, and species. Correlation analysis between fecundity and pond parameters, temperature and dissolved oxygen was found to have major impact. Polythene-covered ponds showed higher fingerling production compared to open field ponds, suggesting a potential benefit of this practice. O. aureus generally showed higher fecundity than O. niloticus. This study contributes valuable information for increasing tilapia breeding practices and enhancing aquaculture production in the Kenyan Highlands.