Theses and Dissertations

Title: The protein requirement of channel catfish, Ictalurus punctatus (Rafinesque)

Name: Nail, Merril Lewis

Degree: MS

Chair: Dr. E.W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1962

Pages: 34

Keywords: Protein Requirement,Channel Catfish.


This project was initiated to determine the level of dietary protein needed by channel catfish for optimum growth. The experimental work was conducted in the Farm Ponds Laboratory of Auburn University, Auburn, Alabama. Each of forty stainless steel troughs was stocked with 25 six to seven inch fish. These fish were fed test diets at a rate of 2.5 per cent of their body weight per day. Every 14 to 21 days from June 22 to Setpember 3, 1961, the fish were reweighed and their daily amount of food adjusted to the new weight.Eight purified diets were fed, each to 5 randomly-assigned troughs. These diets contained protein levels of 6.3, 15.8, 25.3, and 34.8 per cent at carbohydrate levels of 9.3 and 18.6 per cent. Samples of fish were randomly selected at the beginning and at the end of the experiment for carcass analysis. Growth for each diet was compared along with the amount of protein deposited in an effort to determine the level of protein which produced optimum growth. Statistical analysis indicated that of the levels tested a level of 25.3 per cent protein produced optimum growth. Growth was obtained on the lowest level or 6.3 per cent protein diet. The estimated maintenance requirement for channel catfish in this experiment was 0.079 gram of protein per day per hundred grams of fish on the 9.3 per cent carbohydrate diets and 0.029 gram of protein on the 18.6 per cent carbohydrate diets. It was calculated that 0.23 gram of carbohydrate fed per hundred grams of fish would spare 0.05 gram of protein. A decrease in the growth rates of fish in all troughs was noticed in August, during which time the water temperature was at its highest point. This was attributed to the high water temperature and/or a physiological cycle associated with the growth rate.

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