Production and characterization of flour chemistry of fish silage, destined to aquaculture

Abstract

Chemical fish silage is a liquid product elaborated with whole fish or parts of them, with the addition of a few acids or mixture of them, with the liquefaction of the mass being done by enzymes already present in fish. The objective of this study was to evaluate the utilization of fresh water fish Voga (Cyphocharax voga). This species is of low commercial value, found abundantly in Rio Grande do Sul and captured by non-professional fishermen, being discarded soon after capture constituting a problem for fishermen and industries. Besides being poluents, highly nutritive products are wasted. Acetic acid silage was elaborated with ground fish dregs, added 10% acetic acid during 15 days and pH monitored daily. Amino acids, minerals and chemical composition analyses were performed. Results showed that the production of fish chemical silage was satisfactory, allowing decrease in environment pollution and utilization of a promising product in pisciculture. At the end of hydrolysis the protein composition was of 62% showing practically the same composition of the raw material (protein content of 55.49%, 20.79% lipids and 23.12% of total minerals). Silage presented adequate aminoacid and mineral composition, suggesting the utilization of this silage, prepared from fresh water fish dregs, as protein source in fish ration formulation.