Open AccessEffects of dietary visceral protein hydrolysate of rainbow trout on growth performance, carcass composition, digestibility and antioxidant enzyme in juvenile Oncorhynchus mykiss
Author(s) -
Javaherdoust Shaghayegh,
Yeganeh Sakineh,
Amirkolaie Abdolsamad Keramat
Publication year - 2020
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12975
Subject(s) - rainbow trout , biology , juvenile , hydrolysate , dry matter , zoology , antioxidant , composition (language) , fish meal , food science , fish <actinopterygii> , biochemistry , fishery , hydrolysis , ecology , linguistics , philosophy
The purpose of this study was to investigate the effects of dietary visceral protein hydrolysate (VPH) of rainbow trout on performance of juvenile Oncorhynchus mykiss . The antioxidant property of VPH was 85% ± 1.6%. Four diets were prepared including VPH free as the control and three diets with 5, 10 and 20 g/kg of VPH inclusions. Juvenile rainbow trouts ( n = 252, 9.74 ± 0.22 g) were randomly distributed to experimental tanks. Final results showed the maximum amounts of weight gain and SGR and the lowest FCR value in fish fed with 10 g/kg VPH ( p < .05). The highest carcass protein and fat contents were observed in 10 g/kg VPH treatment and the control diet, respectively ( p < .05). The largest fat and dry matter digestibility were recorded in fish fed by 5 g/kg VPH ( p < .05), while the control and 10 g/kg VPH diets showed the highest levels of protein digestibility ( p < .05). Dietary inclusion of VPH improved SOD enzyme activity ( p < .05). The results indicate that a diet containing 10 g/kg of VPH inclusion can improve growth performance and some other examined factors in juvenile O. mykiss .