Fish Hatchery Management - fisheries & aquaculture

FISH HATCHERY MANAGEMENTDRAIN PIPESCREENFIGURE 21. Pond outlet with catch basin. (Source: Davis 1953)The soil type is extremely important; clay soil or subsoil is best. Seepagetests at the pond sites are highly desirable. Seepage loss is not as importantin intensive salmon or trout culture where abundant quantities of waterflow through the pond, but is important in warmwater fish culture wherecirculating water flows are not required.Pond banks must be stable and well drained, because heavy tractors andfeed trucks must have access to the ponds preferably along gravelled roadways.Cement or transite material is best for water supply lines and drainlines.CAGE CULTUREThere is growing interest in cage culture of warmwater species such as catfish.This involves rearing fish in small enclosures built of wire or plasticnetting stretched over a frame. The cages are attached in series to floatingplatforms and anchored in rivers, lakes, and ponds or in protected areasalong coastal shores (Figu.e 23). Water currents and wind action carry