Fatty acids of tilapia fed microbial biomass

<p>Grassi TLM, Oliveira DL, Paiva NM and Ponsano EHG</p>

Fatty acids of tilapia fed microbial biomass

Grassi TLM, Oliveira DL, Paiva NM and Ponsano EHG

Sao Paulo State University, Brazil

: J Mar Biol Oceanogr

Abstract

Microbial biomass (MB) generated by biotechnological processes can be used as a source of protein and antioxidants in Ã¯Â¬Âsh feeds, more sustainable (by reducing the costs of discarding the waste and possible environmental damage) complaying with the nutritional requirements of the animals (Grassi, Santo, Marcos, Cavazzana, Oliveira, Bossolani, Ponsano), increasing growth and improving fatty acid in Ã¯Â¬Âllets. Although MB seems to be an economically sound ingredient for aquafeeds, few of them have been tested in growth trials and little is known about their effect on the fatty acid composition of Ã¯Â¬Âsh, the aim of the current study. In this experiment, 840 tilapia (25 g) were fed one of eight experimental diets with different levels and types of MB; a control diet with no MB and three types of MB at two concentrations (0.25% and 0.5%); Rubrivivax gelatinosus (RG25 and RG50), Saccharomyces cerevisiae (SC25 and SC50) and Spirulina platensis (SP25 and SP50). The fatty acids proÃ¯Â¬Âle showed the highest values of eicosapentanoic acid (C20:5 n-3) were found in RG25, SC25 and SP50 and the docosahexaenoic acid (C22:6 n-3) and arachidonic acid (C20:4 n-6) showed no signiÃ¯Â¬Âcantly differences. The Σn3 and Σn6 not showed diference, but all Ã¯Â¬Âsh fed MB had lower ratios of Σn6 / Σn3 in Ã¯Â¬Âllets. thiagograssi@hotmail.com