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Effects of bioflocs on dietary protein requirement in juvenile whiteleg Shrimp, Litopenaeus vannamei
Author(s) -
Yun Hyeonho,
Shahkar Erfan,
Katya Kumar,
Jang InKwon,
Kim Su kyoung,
Bai Sungchul C
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12772
Subject(s) - litopenaeus , shrimp , biology , hemolymph , zoology , juvenile , fishery , feed conversion ratio , food science , body weight , ecology , endocrinology
A feeding trial was carried out to determine the effects of bioflocs on dietary protein requirement in juvenile whiteleg shrimp, Litopenaeus vannamei . Four bioflocs treatments ( BFT ) and one control group were managed: BFT fed diets 25% of crude protein ( CP ) ( BFT ‐25%), 30% CP ( BFT ‐30%), 35% CP ( BFT ‐35%) and 40% CP ( BFT ‐40%), and clear water control without bioflocs fed with 40% CP ( CW ‐40%). Triplicate groups of shrimp (initial body weight, 1.3 g) were fed one of the test diets at a ratio of 7% body weight daily for 8 weeks. At the end of the feeding trial, significantly ( P < 0.05) higher weight gain and specific growth rate were obtained in shrimp fed BFT ‐35% and BFT ‐40% compared to BFT ‐25% and BFT ‐30%. Shrimp fed BFT ‐35% exhibited the lowest feed conversion ratio. Significantly higher muscle nucleic acid indices were also recorded such as DNA content in BFT ‐30%, RNA content in BFT ‐35% and RNA / DNA ratio than that of shrimp fed control. Total protein level in the haemolymph of shrimp fed BFT ‐40% was significantly higher than those of shrimp fed BFT ‐25% and BFT ‐30%. Therefore, the present results demonstrated that, when L. vannamei juveniles were reared in bioflocs‐based tanks, dietary protein level could be reduced from 40% to 35% without any adverse effect on shrimp growth performance, body composition and haemolymph characteristics. [Correction added on 20 May 2015, after first online publication: sentence modified to clarify the reduction in dietary protein level.].