Journal
FISH & SHELLFISH IMMUNOLOGY
Volume 43, Issue 2, Pages 330-336Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2014.12.028
Keywords
Sea cucumber; Rhodotorula benthica; Growth performance; Digestive activity; Immunity
Funding
- project of national marine public welfare scientific research [201405003-4, 201405003-5]
- Marine industry technology development of Dalian special fund project [20140102]
- Dalian marine industry technology innovation and technology transfer project [20140101]
- national agricultural science and technology achievements transfer project [2013GB2B000090]
- Liaoning province science and technology plan project [2014211003]
- Liaoning province office of education innovation team project [LT2014010]
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The effects of dietary addition of yeast Rhodotorula benthica (R. benthica) D30 which isolated from local sea mud at levels of 0 (control), 105, 105 and 107 CFU/g feed on the growth performance, digestive enzyme activity, immunity and disease resistance of juvenile sea cucumber Apostichopus japonicus were investigated. It was shown that dietary addition of R. benthica D30 significantly increased the growth rates of sea cucumbers (p < 0.05). The amylase activity, cellulase activity and alginase activity were increased for the animals from three probiotics treated groups. And with the supplemented concentration increased, the values of those digestive enzyme activities increased as well. Dietary addition of R. benthica D30 at the level of 10(7) CFU significantly increased the lysozyme, phagocytic and total nitric oxide synthase activity of A. japonicus (p < 0.05). While, the highest values of the phenoloxidase and alkaline phosphatase activity were found in sea cucumbers fed with R. benthica D30 at the level of 10(6) CFU. Whereas adding R. benthica D30 to diet had no significant effects on the total coelomocyte counts and acid phosphatase activity of A. japonicus (p > 0.05). It was observed that adding R. benthica D30 could significantly decrease the cumulative mortality of sea cucumbers. The present study demonstrated that dietary addition of R. benthica D30 could increase growth performance and some digestive enzyme activities, improve immunity and disease resistance of A. japonicus. And the medium (10(6) CFU) and high (10(7) CFU) additional levels showed better effects. It suggests that yeast R. benthica D30 could be a good probiotic for aquaculture. (C) 2015 Elsevier Ltd. All rights reserved.
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