Theses and Dissertations

Title: Dietary levels of calcium and phosphorus for cage-cultured channel catfish

Name: Sitasit, Prasert

Degree: MS

Chair: Dr. Richard T. Lovell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1973

Pages: 32

Keywords: Dietary Calcium,Dietary Phosphorus,Channel Catfish,Cages.


Optimum dietary levels of calcium and phosphorus for cage-cultured catfish were studied by adding two levels of calcium and four levels of inorganic phosphorus to an all-plant basal formula. The basal diet was made from lowphosphorus natural feedstuffs and supplemented with all essential vitamins and minerals. The diets were pelleted and fed to the fish for 156 days as under practical culture conditions. Disease was a consistent problem and the fish were treated two times for external parasites and three times with antibiotics in the feed for internal pathogenic bacteria. Weight gain, mortality and gross signs of nutritional deficiency were evaluated periodically and at the end of the experiment. Amounts of calcium and phosphorus retention in the body of the fish were measured. Due to severe pathogen infestation, meaningful growth and survival results from diets containing different calcium and phosphorus levels were not obtained. Total body calcium concentration was not different among fish fed diets containing different levels of calcium. Total body phosphorus concentration was significantly different (P<. 05) among fish fed the various levels of phosphorus. Fish that received no dietary phosphorus had the least amount of phosphorus in their bodies. Maximum body phosphorus concentration was in fish fed the highest phosphorus diet, O. 8%. Ratio of calcium to phosphorus in the diet also affected phosphorus retention by the fish. Maximum phosphorus percentage in the fish body was found in fish fed diets containing calcium to phosphorus rations of 1:1 or less.

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