What do you mean by composite fish culture? What care should be taken while selecting species for such culture?
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Answer:Composite fish culture is a system in which five or six different species of fishes are grown together in a single fishpond. Fishes with different food habitats are chosen so that they do not compete for food among themselves. ... This ensures complete utilization of food resources in the pond.
Oxygen: 6 mg/l for coldwater fish; 4 mg/l for warmwater fish
Cadmium: <0.0005 mg/l in soft water; <0.005 mg/L in hard water
Copper: <0.0006 mg/l in soft water; <0.03 mg/l in hard water
Calcium: >5 mg/l
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