Title: The Influence of Dietary Protein and Energy on the Performance of Hybrid Striped Bass Reared at Extreme Temperature Authors
Submitted to: Book of Abstracts Aquaculture America
Publication Type: Abstract Only
Publication Acceptance Date: December 13, 2005
Publication Date: February 13, 2006
Citation: Rawles, S.D., Snyder, S.G., Gaylord, T.G., McEntire, M.E., Freeman, D.W. 2006. The influence of dietary protein and energy on the performance of hybrid striped bass reared at extreme temperature [abstract]. Aquaculture America 2006 Book of Abstract. p. 345. Technical Abstract: Seasonal extremes in culture temperatures reduce feed consumption, nutrient assimilation and nutrient retention in hybrid striped bass. Changing the protein and energy level of the diet may improve performance of fish reared during summer and winter. Three factorial experiments were conducted in flow-through tanks supplied with temperature controlled water. In the first trial, groups of fish were held at 8, 10, 15, 20 and 26°C for different intervals to simulate late winter/early spring. Each temperature group was further subdivided and fed two commercial diets (% CP/% lipid: 48/18 or 40/10. In the second and third trials, tanks were held at 29 and 32°C for 4 wks to simulate summer. Four commercial diets (40/15, 40/10, 35/15, 35/10) were fed in the second and third trials. Fish were fed to apparent satiation twice daily and consumption was measured. Growth performance, body composition, nutrient retention and changes in plasma IGF-1 concentrations were determined. In the first trial, fish held at 8°C did not consume feed and lost weight. Fish held at 10°C and above consumed feed and gained weight. Diet composition affected weight gain only above 20°C. Generally, fish performance, body composition and nutrient retention improved in fish fed the higher dietary protein and energy levels of each trial. These data suggest that feeding nutrient dense diets during extreme culture temperatures may improve production efficiency and decrease water pollution in fish culture systems.