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October 27, 2013

China

Biofloc Research with Juvenile Shrimp

 

From Abstract: This study evaluates the effect of bioflocs on the health on juvenile Penaeus vannamei.   Biofloc technology (BFT) is a microbial manipulation technique used in intensive shrimp aquaculture.  The driving force of BFT culture systems is microbial biofloc that is responsible for enhancing water quality, supplementing natural food, and improving growth and health of cultured shrimp.  The aim of this study was to investigate the effects of biofloc on the immune response and antioxidant status of P. vannamei reared in biofloc-based tanks by manipulating the C/N ratio of the feed input.  Two biofloc treatments and one control were compared: Biofloc-based tanks under zero-water exchange with two levels of C/N ratio (15:1 and 20:1) by addition of carbohydrate referred to as “CN-15” and “CN-20” and clear water tanks operated with high water exchange and without addition of carbohydrate referred to as “the control”.  The shrimp were cultured for 30 days. The water quality in biofloc-based tanks was maintained with the promotion and development of biofloc through sucrose addition during the experiment.  At the end of the experiment, the total hemocyte count in the hemolymph and the phagocytic activity of the hemocyte of the shrimp in the two biofloc treatments were significantly higher than those of the shrimp in the control group (P <0.05).  Furthermore, the total antioxidant capacity in both the plasma and the hepatopancreas of the shrimp in the two biofloc treatments was significantly higher than those of the shrimp in the control group (P <0.05).  Increased superoxide dismutase activity in the plasma, and increased reduced/oxidized glutathione ratio in both the plasma and the hepatopancreas were found in the shrimp of the two biofloc treatments (P <0.05).  There were no significant differences in all of the above parameters between the CN-15 and CN-20 treatments (P >0.05).  The results indicated that promoting biofloc through carbohydrate addition in zero-water exchange systems could enhance immune cellular response and antioxidant status of cultured shrimp under the conditions of the present study.

 

Source: Aquaculture.  Enhancement of Immune Response and Antioxidant Status of Litopenaeus Vannamei Juvenile in Biofloc-Based Culture Tanks Manipulating High C/N Ratio of Feed Input.  Wu-Jie Xu and Lu-Qing Pan (email panlq@ouc.edu.cn, The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China).  Volume 412-413, Pages 117–124, November 1, 2013.

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