The broodstock facility is an approved quarantine station with permit to import genetically superior broodstock (at 1-day old fry) from the Netherlands. Fry are grown to sexual maturity, upon which fish that are the most adaptable to South African conditions are selected for further breeding.
In order to decrease stress situations and to increase female fertility, female stocking densities in parent stock tanks are maintained between 10-20 kg/m3. Females are fed on a special broodstock feed formulation to increase fertility, fecundity and egg development.
Females are spawned monthly for 4 consecutive months after which they are rested for 8 months. For 6 weeks prior to spawning and during spawning, females are fed a special conditioning feed that will enable the females to produce the maximum quantity and best quality eggs with as little as possible loss of condition.
The fastest growing males that are selected from each batch of grow-out fish and treated similarly to the females prior to spawning. To prevent inbreeding, males from F1, F2, and F3 generations are bred with genetically unrelated females. To induce spawning, males and females are treated with natural hormones from the pituitary gland.
The fastest growing males are selected to breed with the top females in the hatchery.
The fry are reared on natural feed to fingerling size and then moved to grow-out systems.
Fry & Fingerling Production:
In the grow-out systems the fish are grown to 1.5 kg on top quality floating pellets in about 8 months.
At harvest size the fish are processed into different products in a HACCP facility.