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Dietary Phosphorus Requirement of Channel Catfish¹

Department of Biochemistry, Mississippi State University, Mississippi State, MS 39762

Two experiments were conducted to reevaluate the dietary phosphorus requirement of fingerling channel catfish. Basal diets containing either casein with supplemental inorganic phosphorus and 0.5% total calcium or egg albumin with supplemental inorganic phosphorus and 0.75% total calcium yielded similar requirement data. Eleven-week growth, feed efficiency, serum phosphorus, bone ash, bone calcium and bone phosphorus data indicate that 0.33% apparent available dietary phosphorus is adequate for maximum growth and bone mineralization. Based on these data and previous findings, we would suggest a value of 0.4% apparent available phosphorus be used in formulating catfish feeds. The apparent availability of phosphorus from soybean meal, as determined by the chromic oxide indicator method, was 29% for channel catfish.

KEY WORDS: • channel catfish • phosphorus requirement • available phosphorus • soybean meal

¹ Mississippi Agriculture and Forestry Experiment Station, Publication No. 4853.

² Present address: Department of Wildlife and Fisheries Sciences, Texas A & M University, College Station, TX 77843.

Manuscript received 23 November 1981.