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Combined effects of dietary starch:Protein ratios and short cycles of fasting/refeeding on Nile tilapia growth and liver health
Author(s) -
Macêdo Élison Silva,
Almeida Omer Cavalcanti,
Lucena Jorge Eduardo Cavalcante,
Torres Márcia Bersane Araújo de Medeiros,
Bicudo Álvaro José de Almeida
Publication year - 2021
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.14971
Subject(s) - nile tilapia , biology , zoology , feed conversion ratio , factorial experiment , tilapia , fish <actinopterygii> , nutrient , medicine , endocrinology , body weight , fishery , oreochromis , ecology , statistics , mathematics
This study evaluated the combined effects of different dietary starch:protein ratios (SPR) and short cycles of fasting/refeeding (FR) on Nile tilapia juveniles on growth, feed and nutrient use, whole‐body composition and liver health. Three diets with SPR classified as high (S30:P32; 0.96 g:g), intermediate (S25:P36; 0.69 g:g) and low (S21:P39; 0.53 g:g) were fed to fish over 60 days on three feeding regimes: 0FR—fish fed daily (control treatment); 1 FR—fish fasted for one day and refed for three days and 2 FR—fish fasted for two days and refed for three days. Fish (2.25 ± 0.01 g) were allotted to a completely randomized factorial design (3 × 3; n = 3). Fish growth and feed conversion ratio decreased ( p < .05) with increasing FR. There was no significant difference in daily feed intake between regular‐fed and fasted tilapia as a consequence of hyperphagia in fasted fish. Protein and energy productive values increased ( p < .05) with increasing SPR. The occurrence of hepatic steatosis was similar ( p > .05) among daily‐fed fish regardless of SPR but increased ( p < .05) with increasing SPR in fasted fish. Regardless of dietary SPR, short cycles of fasting/refeeding do not promote compensatory growth. Therefore, Nile tilapia around 2g should be fed daily with low‐SPR diet.