The effect of temperature on hatching of O. karongae eggs has not been studied in Malawi. Such information can be necessary in: (i) The process of adapting a hatchery system for increased production of O. karongae, and (ii) When setting the basis for developing egg development schemes that are required for management of aquaculture production schedules. In fisheries, predictive relationships relating egg incubation time with environmental factors are necessary for developing individual-based models (IBMs) that link fecundity of adult populations to recruitment via planktonic egg development stages. Temperature is also known to explain most of the variance in planktonic egg development stages (Pauly and Pullin, 1988). Temperature-dependent egg development relationships are instrumental to the estimation of spawning stock biomass using egg production methods (Lo et al., 1992; Armstrong et al., 2001). The main objective of the present study was to establish temperature- dependent egg development rates hatchability and survival rate for O.
karongae, in a recirculating system hatchery.