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United States Department of Agriculture

Agricultural Research Service

Research Project: INTEGRATED APPROACHES FOR IMPROVING EFFICIENCY AND SUSTAINABILITY OF LOW-SALINITY MARINE AQUACULTURE PRODUCTION

Location: Harry K. Dupree Stuttgart National Aquaculture Research Center

Title: Growth and survival of juvenile queen conch, Strombus gigas fed artificial diets containing varying levels of digestible protein and energy

Authors
item Garr, Amber -
item Acosta-Salmon, Hector -
item Riche, Marty
item Davis, Megan -
item Capo, Thomas -
item Haley, David
item Tracy, Patrick

Submitted to: North American Journal of Aquaculture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 26, 2010
Publication Date: February 2, 2011
Citation: Garr, A.L., Acosta-Salmon, H., Riche, M.A., Davis, M., Capo, T.R., Haley, D.I., Tracy, P. 2011. Growth and survival of juvenile queen conch, Strombus gigas fed artificial diets containing varying levels of digestible protein and energy. North American Journal of Aquaculture. 73:34-41.

Interpretive Summary: Aquaculture methods for queen conch, Strombus gigas, have been established for several decades. However, there is a need to improve husbandry techniques and artificial diets for the growout of juveniles. The purpose of this study was to determine growth and survival of juvenile queen conch fed artificial diets with increasing levels of the red algae Agardhiella species and/or soy protein isolate with increasing energy levels. Results indicated the highest growth rates and survival were for the conch fed diets with a soy protein isolate protein substitution of 15 % or less. This study highlights the importance of the protein source in the artificial diets of juvenile queen conch.

Technical Abstract: Aquaculture methods for queen conch, Strombus gigas, have been established for several decades. However, there is a need to improve husbandry techniques for the growout of juveniles. The purpose of this study was to determine growth and survival of juvenile queen conch fed artificial diets with increasing levels of the red algae Agardhiella species. The Rodophyta Agardhiella sp., soy protein isolate, and fish oil were increased at the expense of catfish feed and/or wheat flour to maintain the diets isonitrogenous (38% crude protein) with increasing protein to energy (P:E) ratios (83 – 96 mg CP/kcal). Yttrium was also incorporated as an inert marker for determining digestibility of dietary nutrients. Juvenile queen conch were stocked at 75 conch/m2 for a total of 16 conch per replicate (three replicates), and were fed 125 mg of diet per conch each day for six months. Dietary crude protein ranged from 31 to 38%. Dietary lipid, moisture, energy, ash, fiber, carbohydrate, and yttrium in each diet were also determined. Juvenile conch were measured (shell length and wet weight) every six weeks. At the end of the experiment, feces were collected to determine protein, energy, and dry matter digestibility. Results indicated the highest growth rates (0.10 mm/d and 0.11 mm/d) and survival were for the conch fed diets with a soy protein isolate protein substitution of 15% or less. This study highlights the importance of the protein source in the artificial diets of juvenile queen conch.

Last Modified: 4/21/2014
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