Composição centesimal e glicogênio das ostras nativa Crassostrea gasar e exótica Crassostrea gigas em diferentes épocas do ano no sul do Brasil

Abstract

The oysters represent a high nutritional value kind of food, they are considered rich sources of proteins and minerals. However, its nutritional composition can change, among other factors, according to the place of extraction, wether is food available or not, the season of the year and the degree of gonadal maturation. The main goal of the present study was to evaluate the chemical composition and glycogen contents of two species of oysters, the exotic Crassostrea gigas and the native C. gasar. This present final paper accomplished itself in the laboratories of the Aquaculture Engineering course at the Federal University of Fronteira Sul (UFFS), at Laranjeiras do Sul-PR campus. The samples of two oyster species were collected from a conducted cultivation at Paraíso das Ostras marine farm, located in Caeira da Barra do Sul, Florianópolis / SC, at four different periods of the year, in April, July and October of 2019 and in January of 2020. The two oyster species were grown in lanterns that were located in natural environment, distributed in a completely randomized design with 3 repetitions/species. In the sample collections, the animals were removed from the culture lanterns, sanitized and removed from their shells for the following analysis of the proximal composition (moisture, protein, lipid and ash) and soft tissue glycogen. The obtained results were analyzed statistically via bifactorial ANOVA and Tukey test of averages separation (p<0.05). It was found that the time of year influences the nutritional composition of oysters C. gigas and C. gasar. For both species, in general, the highest concentrations of protein, lipid and glycogen were observed in October.