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The use of tuna industry waste in the practical diets of juvenile Nile tilapia ( Oreochromis niloticus , L.): effect on growth performance, nutrient digestibility and oxidative status
Author(s) -
Saïdi Saber Abdelkader,
Azaza Mohamed Salah,
Abdelmouleh Abdelwaheb,
Pelt Jos van,
Kraïem Mohamed Mejdeddine,
ElFeki Abdelfattah
Publication year - 2010
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/j.1365-2109.2010.02594.x
Subject(s) - nile tilapia , oreochromis , biology , feed conversion ratio , zoology , protein efficiency ratio , catalase , glutathione peroxidase , superoxide dismutase , juvenile , fish meal , nutrient , tilapia , meal , food science , antioxidant , fishery , biochemistry , fish <actinopterygii> , ecology , body weight , endocrinology
A 45‐day feeding trial was conducted to study the effect of replacing dietary fish meal (FM) with a tuna by‐product meal (TBM) on the growth, feed efficiency, carcass composition and stress oxidative status of juvenile Nile tilapia, Oreochromis niloticus L.). Triplicate groups of fish (2.21 ± 0.01 g) were fed on four iso‐nitrogenous and iso‐energetic diets. The control diet (A 0 ) used FM as the sole source of animal protein. In the other three diets (A 10 –A 30 ), 33%–100% of FM was substituted by TBM at 10% increments. There were no significant differences ( P >0.05) in growth performance among fish fed on diets A 0 , A 10 and A 20 . Fish fed these experimental diets (i.e., A 0 , A 10 and A 20 ) showed significantly ( P <0.05) better daily mass gain, specific growth rate and protein efficiency ratio than those fed on diet A 30 . Feed conversion ratio increased with increasing TBM content, but only the value found in fish fed on diet A 30 differed significantly ( P <0.05) from the other treatments. The fish accumulated increasing quantities of lipids and decreasing levels of ash in their carcasses with increasing levels of dietary TBM. At the end of the experimental period, a significant increase ( P <0.001) in catalase and glutathione S ‐transferase activities was seen only in groups fed on diet A 30 . Similarly, a significant enhancement in glutathione peroxidase and superoxide dismutase activities was observed in groups fed on diets A 20 and A 30 compared with the other groups. The results show that this product can be included up to 20% in practical Nile tilapia diets without any detrimental effects.