Theses and Dissertations


Title: THE EFFECTS OF DIETARY PROTEIN AND LIPID ON GROWTH AND BODY COMPOSITION OF JUVENILE RED SNAPPER, LUTJANUS CAMPECHANUS

Name: Miller, Christian Lewis

Degree: MS

Chair: D. Allen Davis

Resides:

University: Auburn University

Location: Auburn, Alabama

Date: 2003

Pages: 58

Keywords: Growth,dietary protein,lipid,red snapper

Abstract:

Two studies were designed and conducted to evaluate the influence of dietary protein and lipid levels on growth and body composition of juvenile red snapper. To evaluate the response to dietary protein, four diets were formulated to contain 44, 40, 36, and 32% protein with practical energy:protein (E:P) ratios. To evaluate the response to dietary lipid levels, four isonitrogenous diets (44% protein) were formulated to contain 14,12,10, and 8% lipid. Variable protein diets (four replicates per treatment) were fed to juvenile red snapper (mean initial weight 5.9 g) based on a percentage of body weight, held in rectangular tanks containing 190 l of seawater at 32g/l, 27.0 ± 0.76 °C for 10 weeks. Variable lipid (three replicates per treatment) diets were fed to juvenile red snapper (mean initial weight 8.6 g) based on a percentage of body weight, held in circular tanks containing 1000 l of seawater at 33g/l, 26.3 ± 1.02°C for 10 weeks.No significant differences (p < 0.05) were found in final weights, feed conversion efficiency, survival, whole body lipid, or hepatosomatic index (HSI) in either study. In the study containing diets of variable protein content, there was a significant difference (p < 0.05) in the protein conversion efficiency (PCE). Fish fed a diet containing 32-36% protein retained dietary protein at much more efficient rate. In the study containing diets of variable lipid content, there was a significant difference (p < 0.05) in the intraperitoneal fat ratio (IPFR) and % whole body protein. Fish fed a diet containing 14% lipid had a significantly greater amount of fat deposition in the body cavity, while those fed a diet containing 10% lipid had a significantly higher percentage of protein based on a whole body composition.Preliminary results indicate that dietary protein requirements for juvenile red snapper may be as low as 32%. Data also suggests that dietary lipid should not exceed 10% in order to limit the amount of body fat deposition in juvenile red snapper, and promote the sparing of dietary protein for tissue growth.

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