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Growth performance, oxidative stress indices and hepatic carbohydrate metabolic enzymes activities of juvenile Nile tilapia, O reochromis niloticus L ., in response to dietary starch to protein ratios
Author(s) -
Azaza Mohamed Salah,
Khiari Noura,
Dhraief Mohamed Naceur,
Aloui Néji,
Kraϊem Mohamed Mejdeddine,
Elfeki Abdelfattah
Publication year - 2015
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.12153
Subject(s) - nile tilapia , biology , oreochromis , catalase , carbohydrate , glutathione , feed conversion ratio , starch , medicine , endocrinology , oxidative stress , zoology , biochemistry , enzyme , body weight , fish <actinopterygii> , fishery
The effect of various dietary starch to proteins ratios ( STA /P) on growth performance, oxidative status and liver enzyme activities involved in intermediary metabolism in juvenile Nile tilapia was evaluated. Four isocaloric‐practical diets (12.73 MJ kg −1 digestible energy) with increasing STA / CP ratios were formulated. These were designated D 0 (344 g crude protein ( CP ) and 163.5 g starch ( STA ) kg −1 ), D 1 (310 g CP and 243 g STA  kg −1 ), D 2 (258 g CP and 322 g STA kg −1 ) and D 3 (214 g CP and 401 g STA kg −1 ). Each diet was fed to triplicate groups of 60 fish (2.7 g) for 45 days. Compared with the control diet (D 0 ), significantly ( P  < 0.05) depressed growth and feed efficiency were observed only in the groups fed on diet D 3 . The activities of hepatic enzymes involved in glycolysis and lipogenesis pathways were significantly enhanced in groups fed on diet D 3 compared with other diets. A significant ( P  < 0.05) increase in catalase activity was detected only in groups fed on diet D 3 . Similarly, a significant ( P  < 0.05) enhancement in superoxyde dismutase, glutathione S‐transferases and glutathione peroxidise was observed in groups fed on diets D 2 and D 3 compared with other diets. Results demonstrate the ability of juvenile Nile tilapia to spare protein by dietary carbohydrate.

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