Fish Hatchery Management - fisheries & aquaculture

HATCHERY REqUIREMENTS 49FIGURE 22. A pond catch basin should have a supply line (arrow) toprovide fresh water to the fish when they are collected in the basin.This pond outlet also has a valve to open the pond drain.away wastes and provide fresh water. Cage culture is readily adapted toareas that cannot be drained or from which fish cannot be readily harvested.However, good water circulation must be assured, as an oxygendepletion in water around cages can cause catastrophic fish losses. Diseasecontrol is very difficult in cage culture and labor requirements are high.Feeding and treatment for disease must be done by hand.Largemouth bass fingerlings have been experimentally grown in cages.Cylindrical instead of rectangular containers were used to prevent crowdingin corners, which might cause skin damage to active fish such as bass.Moist trout pellets were fed to the fish; a retaining ring kept the food insidethe cage until it could be eaten.Frcunr 23.Cage culture of catfish. (FWS photo.)