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Trophic ecology and isotopic, histophysiological biomarkers of two species of fish belonging to different trophic guilds associated to cage fish farms

Grant number: 18/26348-7
Support type:BIOTA-FAPESP Program - Regular Research Grants
Duration: February 01, 2020 - January 31, 2023
Field of knowledge:Biological Sciences - Ecology - Ecosystems Ecology
Principal researcher:Igor Paiva Ramos
Grantee:Igor Paiva Ramos
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Assoc. researchers:Antonio Fernando Monteiro Camargo ; Cristiéle da Silva Ribeiro ; João Paulo de Arruda Amorim ; Juan Antonio Balbuena Díaz-Pinés ; Lidiane Franceschini ; Rosilene Luciana Delariva

Abstract

Currently, national public policies encourage the substitution of extractive fisheries for aquaculture activities, whose annual growth rate in Brazilian territory is the highest among zootechnical activities. However, the implementation and management of this activity can influence the aquatic ecosystem, acting as a source of secondary energy through leftover rations, dead fish and metabolites, and may cause changes in the structure of local communities. There are studies that demonstrate the feeding alteration of wild fish associated with fish farms, however, little is known about the biological effects of the consumption of fish remains on the wild fish fauna of Brazilian reservoirs. The objective of this proposal is to evaluate the influence of Oreochromis niloticus fish farms in trophic ecology (consumption and assimilation through stable isotopes) and in the histophysiological aspects of two species of wild fish, in the Ilha Solteira Reservoir, SP. Thus, food and histophysiological aspects (liver histopathology, protein, lipids and carbohydrates concentrations of muscle, liver and gonadal tissue) of two species of wild fish belonging to different trophic guilds, associated to three fish farming systems and two areas without the influence of this type of aquaculture activity, will be evaluated. Two samplings will be performed in the 12-month period. The collection period was determined considering the feed conversion rate of the fish in cultivation throughout the year. The results obtained with this research may contribute to the planning and mitigation of the impacts of this economic activity, aiming to indicate and characterize the effects on the aquatic system involving biological communities and abiotic variables. (AU)

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