High-rate algal ponds for improved dissolved oxygen supply for African Catfish (Clarias gariepinus Burchell, 1822) culture: A preliminary study

Low dissolved oxygen (DO) concentration is a major water quality challenge limiting the survival and performance of farmed fish, causing stress and leading to slow growth, and greater susceptibility to diseases, consequently resulting in low fish yields. This study investigated the application of a high-rate algal pond (HRAP) technology to improve DO concentration levels and supply for African catfish culture. Fish tanks were supplied with either DO-rich water from the HRAP mixed liquor (HRAPL) or DO-poor river water (RW). Each tank was stocked with 30 fingerlings of African catfish of average weight of 2 g. Growth performance parameters, fish yield, and survival were monitored fortnightly for three months from 23rd April to 16th July 2023. Results revealed significantly higher fish growth performance, yield, and survival in HRAPL-fed tanks than in RW-fed tanks. These results suggest the potential use of the HRAP system in enhancing DO concentration level and supply for improved fish growth in aquaculture production systems.