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Elven, France

Khosravi S.,Jeju National University | Rahimnejad S.,Jeju National University | Herault M.,Aquativ Corporation | Fournier V.,Aquativ Corporation | And 4 more authors.
Fish and Shellfish Immunology | Year: 2015

This study was conducted to evaluate the supplemental effects of three different types of protein hydrolysates in a low fish meal (FM) diet on growth performance, feed utilization, intestinal morphology, innate immunity and disease resistance of juvenile red sea bream. A FM-based diet was used as a high fish meal diet (HFM) and a low fish meal (LFM) diet was prepared by replacing 50% of FM by soy protein concentrate. Three other diets were prepared by supplementing shrimp, tilapia or krill hydrolysate to the LFM diet (designated as SH, TH and KH, respectively). Triplicate groups of fish (4.9±0.1g) were fed one of the test diets to apparent satiation twice daily for 13 weeks and then challenged by Edwardsiella tarda. At the end of the feeding trial, significantly (P<0.05) higher growth performance was obtained in fish fed HFM and hydrolysate treated groups compared to those fed the LFM diet. Significant improvements in feed conversion and protein efficiency ratios were obtained in fish fed the hydrolysates compared to those fed the LFM diet. Significant enhancement in digestibility of protein was found in fish fed SH and KH diets and dry matter digestibility was increased in the group fed SH diet in comparison to LFM group. Fish fed the LFM diet showed significantly higher glucose level than all the other treatments. Whole-body and dorsal muscle compositions were not significantly influenced by dietary treatments. Histological analysis revealed significant reductions in goblet cell numbers and enterocyte length in the proximal intestine of fish fed the LFM diet. Superoxide dismutase activity and total immunoglobulin level were significantly increased in fish fed the diets containing protein hydrolysates compared to the LFM group. Also, significantly higher lysozyme and antiprotease activities were found in fish fed the hydrolysates and HFM diets compared to those offered LFM diet. Fish fed the LFM diet exhibited the lowest disease resistance against E.tarda and dietary inclusion of the hydrolysates resulted in significant enhancement of survival rate. The results of the current study indicated that the inclusion of the tested protein hydrolysates, particularly SH, in a LFM diet can improve growth performance, feed utilization, digestibility, innate immunity and disease resistance of juvenile red sea bream. © 2015 Elsevier Ltd.


Bui H.T.D.,Jeju National University | Khosravi S.,Jeju National University | Fournier V.,Aquativ Corporation | Herault M.,Aquativ Corporation | Lee K.-J.,Jeju National University
Aquaculture | Year: 2014

This study was conducted to investigate the effects of dietary supplementation of protein hydrolysates on growth, feed utilization, innate immune response, digestibility and disease resistance of juvenile red seabream. A basal fish meal based diet was used as a control and three other diets were prepared by partial replacement of fish meal with krill hydrolysate concentrate, shrimp hydrolysate powder or tilapia hydrolysate powder (designated as Con, KH, SH and TH, respectively). Triplicate groups of fish (29.0 ± 0.1. g) were fed one of the diets to apparent satiation twice a day for 12. weeks. Growth performance and feed utilization were significantly higher in fish fed the KH and SH diets. Diets with the tested hydrolysates showed significantly higher digestibility of dietary protein compared to the Con diet. Antiprotease and superoxide dismutase activities were significantly increased in fish fed the KH diet compared to those of fish fed the Con diet. Total immunoglobulin level was significantly elevated in fish fed diets containing the hydrolysates. Dietary inclusion of KH and TH significantly increased disease resistance of fish against Edwardsiella tarda. The results indicate that supplementation of the tested protein hydrolysates at approximately 5%, replacing fish meal by 10%, can improve the growth performance, feed utilization, digestibility of dietary protein, innate immunity and disease resistance of juvenile red seabream. © 2013 Elsevier B.V.


Khosravi S.,Jeju National University | Bui H.T.D.,Jeju National University | Rahimnejad S.,Jeju National University | Herault M.,Aquativ Corporation | And 3 more authors.
Aquaculture Nutrition | Year: 2015

A 9-week feeding trial was conducted to investigate the effects of dietary supplementation with protein hydrolysates on growth, innate immunity and disease resistance of olive flounder. A fishmeal (FM)-based diet was regarded as a control, and three diets were prepared by partial replacement of FM with krill hydrolysate, shrimp hydrolysate or tilapia hydrolysate (designated as Con, KH, SH and TH, respectively). Triplicate groups of fish (24.5 ± 0.3 g) were fed one of the diets to apparent satiation twice daily for 9 weeks and then challenged by Edwarsellia tarda. Fish-fed KH diet showed significantly (P < 0.05) higher growth performance and feed utilization compared with the Con diet. Dry matter digestibility of the diets was significantly increased by KH and TH supplementation. All the examined innate immune responses were significantly increased in fish fed KH diet. Significantly, higher respiratory burst and superoxide dismutase (SOD) activities were found in fish-fed SH diet. Lysozyme and SOD activities were significantly increased in fish-fed TH diet. However, no significant effect was found on fish disease resistance. This study indicates that dietary supplementation of the hydrolysates, particularly KH, can improve growth performance, feed utilization and innate immunity of olive flounder. © 2014 John wiley & Sons Ltd.

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