2) MacDonald Jars-
With egg collection and incubation, the hatchery operators claim that high egg and fry production are achieved with this method as compared to the fry collection technique where they claim only 30% recovery. Harvesting the eggs from the brooding female Tilapia also shortens its re-maturation period.
The original MacDonald jar incubator can also be used to hatch eggs of other fish species like bighead carps, Pangasius, Red tail sharks, tinfoil barb, Pacu and other fish producing demersal type eggs. Its only disadvantage is its small volume capacity. For big spawners producing big volumes of eggs, several of these small sized incubator will be necessary.