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Diets containing antioxidants extracted from bycatch of marine shrimp: effects on the physiology of yellowtail tetra fish (Astyanax lacustris)

Grant number: 20/08674-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2020
Effective date (End): October 31, 2021
Field of knowledge:Biological Sciences - Physiology
Principal researcher:Alessandra da Silva Augusto
Grantee:Ana Carolina Louzã Siqueira
Home Institution: Instituto de Biociências (IB-CLP). Universidade Estadual Paulista (UNESP). Campus Experimental do Litoral Paulista. São Vicente , SP, Brazil

Abstract

It is known that for every kilo of marine shrimp caught, up to 13 kilos of other species are captured together and possibly discarded because they have no economic interest. These animals constitute the by-catch fishing. In 2013, a project by our research group (CNPQ, Process 408968 / 2013-3) evaluated which was the main species present in the marine shrimp fishery of the coast of São Paulo and extracted and purified peptides with biologically active potential in such species. One of the hydrolyzed peptides has an antioxidant role, therefore, potential to be incorporated into species' diet with an economic interest for aquaculture. In this sense, the present project aims to evaluate the effects of an antioxidant incorporated in the feed on the physiology of yellowtail tetra fish (Astyanax lacustris). The energy balance, hepatosomatic index, osmoregulation, type of oxidized energy substrate (protein, carbohydrate, or lipid), and gills' morphology of animals fed will be evaluated for 30 days. The analysis of energy balance will be carried out by quantifying the energy ingested and channeled to the growth, metabolism, nitrogen excretion, and feces. This is an important stage in our research group because we can identify the role of the antioxidant in the fishes' physiology which has an economic interest and whether these molecules can be used in the manufacture of feed, making it an alternative for the use of marine animals that make up the accompanying fauna.

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