Theses and Dissertations

Title: Influences of dietary fiber level on production of channel catfish and water quality

Name: Leary, Daniel F.

Degree: PhD

Chair: Dr. Richard T. Lovell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1973

Pages: 70

Keywords: Dietary Fiber Level,Channel Catfish,Water Quality.


Channel catfish fingerlings, stocked at a rate of 15,000/ha in outdoor, concrete tanks of 0.002 ha surface area each, were fed commercial-type diets that contained fiber levels ranging from 2% to 20% of the diet, but equal daily allowances of available nutrients. In 200 days they grew from 20 g to approximately 220 g. Total gains in kg/ha produced by fish fed the 2%, 8%, 14% and 20% fiber diets were: 3132, 2705, 2468, and 2532. Association of best gain with lowest dietary fiber level differs from results of a previous study, conducted with purified diets, in which gain was found to be highest when the diet contained 21% cellulose. Differences between experimental conditions of the two experiments were suggested as a possible explanation for the discrepancy. Diet had no significant effect on nutrient digestibilities, percentage dress-out, or composition of whole or dressed carcasses. Neither dissolved oxygen nor ammonia concentrations in the tank waters were significantly influenced by fiber level of the diets. In the final 45 days of the experiment, dissolved oxygen tended to be inversely related to dietary fiber. Ammonia concentrations, averaged over the entire experiment, were slightly higher in tanks that received feeds containing 2% or 8% fiber than in the others. It was concluded that channel catfish under intensive cultivation gain more on practical-type feeds containing 2% fiber than on those having more bulk. Because less of such feeds, therefore lower amounts of added pollutants, would be required per fish, more fish theoretically could be grown in a given volume of static water, where input of organic matter must be restricted.

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