CHEMICAL COMPOSITION OF NILE TILAPIA Oreochromis niloticus FINGERLINGS CHALLENGE BY DIETARY FUMONISINS B1 + B2

Bruno Lala*, Roberto O. Roça, Bruno M. Artacho, Gabriel R. Geraldo, Nara L.C. Delbem, Guilherme S.L. Sampaio, Eliane Gasparino and Stefânia C. Claudino-Silva
 
College of Veterinary Medicine and Animal Sciences
São Paulo State University
Botucatu, SP, Brazil, 18618-970
brunolala@hotmail.com
 

Toxicity of fumonisin (FB) has been considered for different fish species. In fishes, although many effects of fumonisins have been shown, were not found reports of their effects on the muscle chemical composition and fatty acid profile. Thus, we aimed to evaluate the effects of different levels of fumonisin on chemical composition in carcass of tilapias fingerlings.

A total of 180 sex-reversed male fingerlings of GIFT × Thai breed group, with an average weight of 2.64 g, were used. Fishes were distributed into three fiber cement tanks with a useful volume of 900 L each, with an individual water restoration system (15%/day) and constant aeration through a porous rock coupled to a central air blower. Four hapa net cages were inserted into each tank. Isocaloric and isoproteic diets were formulated considering the concentration of FB1 + FB2. Experimental groups were formed. Control diet, no FB; 20 mg FB kg-1 (16.36 mg g-1 FB1 + 3.64 mg g-1 FB2); 40 mg FB kg-1 (32.71 mg g-1 FB1 + 7.29 mg g-1 FB2); and 60 mg of inclusion of FB kg-1 (49.07 mg g-1 FB1+ 10.93 mg g-1 FB2). Carcass was collected after slaughter for fatty acids profile analysis.

Moisture showed quadratic effect of regression (Y= -8.682x2 + 20.06x + 68.03; R² = 0.688); ashes showed linear effect of regression (Y= 0.205x + 1.465; R² = 0.811); crude protein was significantly lower to the higher dose (FB60 = 15.38 ± 0.54, P=0.0003) than other treatments (control=17.82 ± 0.63, FB20 = 17.07 ± 0.2, FB40 = 18.16 ± 0.25); and total lipids showed quadratic effect of regression (Y= 0.140x2 - 0.806x + 1.796, R² = 0.868). Fumonisins reduces the weight gain in fishes to every level of contamination studied. FB60 level decreases crude protein in Nile tilapia fingerlings. Fumonisins alter chemical composition on Nile tilapia fingerlings.