This research evaluated the effect of the inclusion of different lipid sources in the diet on the on the polyunsaturated fatty acids profile PUFA in Piaractus brachypomus fillet. Four types of oil were used; palm, corn, soy and fish oil, to formulate diets that comply with the nutritional requirements of the fish. These four diets were supplied for two months and a commercial diet was used as a control. The fatty acid profile was determined for oils, diets and fillets, before and after the experiment. The levels of omega-6 polyunsaturated fatty acids (n-6 PUFA) such as arachidonic acid (AA) and omega-3 polyunsaturated fatty acids (n-3 PUFA) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were analyzed. The best PUFA profile in fillets (2,11; 4,64 and 7,0 % AA; EPA and DHA respectively) was obtained with the diet elaborated with fish oil, however, the best vegetable oil...

Hydrothermal vent activity is often associated with submarine volcanism. Here, we investigated the presence of microorganisms related to hydrothermal activity in the Orca seamount. Data profiling of the 16S rRNA gene amplicon sequences revealed a diversity pattern dominated mainly by the phyla Proteobacteria, Acidobacteria, Planctomycetes, and Bacteroidetes.

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