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June 30, 2015

Australia/China

Research—Microalgae in Monodon Feeds

 

This study used small amounts of several lyophilized microalgae (5% of dry weight in aquafeed) to feed adult giant tiger shrimp (Penaeus monodon) for 4 weeks, aiming to promote their health and nutritional level.  Apart from slight increases in ash content, chlorophyll and β-carotene in the microalgae diets, there was no difference in their biochemical composition from the commercial control diets.  After 28 days of feeding, shrimp body length, body weight, condition index and total amount of fatty acids and amino acids of the flesh (from the 2nd abdominal segment) were not affected by microalgae additives, compared to the control commercial diet.  Shrimp fed the microalgae diets, however, had better survival rates than those fed the commercial control diet, although no statistical significance was detected for any of the microalgae diets, except for those containing the diatom Melosira sp.  The elevated survival rate was concomitant with a higher phagocytosis rate and superoxide dismutase (SOD) activity in the immune response analysis, and a significantly higher astaxanthin content detected in the tail muscle.  These findings demonstrated that low-inclusion of microalgal additives in shrimp diets over a short feeding period (4 weeks) can result in healthier adult shrimp, and hence could contribute to the development of an optimized feeding strategy for shrimp that were close to harvest size.

 

Source: Aquaculture Research.  Nutrient Efficacy of Microalgae as Aquafeed Additives for the Adult Black Tiger Prawn, Penaeus monodon.   Yan Li (email yan.li3@jcu.edu.au, Centre for Sustainable Tropical Fisheries and Aquaculture and College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia), Guoqiang Xiao, Arnold Mangott, Megan Kent and Igor Pirozzi.  Volume 46, Issue 7.  Online Version Published Before Inclusion in an Issue.  June 24, 2015.

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