Fish Production As Related To Soil Chemical Constituents

Catfish production varied 40 per cent among 12 ponds in a uniformity test. Survival, spawning, and trash fish made no significant contribution to this variation. Production was directly related to the amount of certain constituents found in the pond soils, namely, exchangable calcium, electrical conductivity, magnesium content of soil - water (1 :2.5) extracts, and nitrate nitrogen.