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Do cage fish farms interfere with the trophic ecology of Metynnis lippincottianus (Characiformes, Serrasalmidae) ?

Grant number: 20/10507-9
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2021
Effective date (End): February 28, 2022
Field of knowledge:Agronomical Sciences - Fishery Resources and Fishery Engineering - Inland Water Fishery Resources
Principal Investigator:Igor Paiva Ramos
Grantee:Julia Kaori Kuriyama Ramos
Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil


Cage fish farming is one of the fastest growing zootechnical activities in Brazil, due to its high availability of freshwater resources in addition to the favorable tropical climate for implantation. However, with the implementation of this cultivation model, it makes available organic matter (scale, excreta and feed, among others) in the adjacent aquatic environment, the local biota, especially the wild fish diet. Thus, the present proposal aims to test the hypothesis that there is a difference in the feeding aspects of Metinnys lippincottianus between areas under aquaculture influence and areas without the influence of this type of zootechnical activity in a Neotropical reservoir. The samples of specimens of M. lippincottianus was carried out with waiting nets in both areas, in the period from March to June 2019 (41 specimens from the tank area and 33 from the control area). After collection, all captured specimens were euthanized, frozen and transported to the laboratory. Subsequently, their stomachs were removed and fixed in 4% formaldehyde and preserved in 70% alcohol for laboratory analysis. Stomach contents will be examined and food items identified to the lowest possible taxonomic level, and quantified using the volumetric method. The composition of the diet and its possible differences, will be evaluated through the analysis of PERMANOVA and SIMPER and the breadth of trophic niche through PERMDISP. The trophic guild of the species will also be determined. It is expected with the results of this proposal, to increase the understanding of the influences of aquaculture activity in cage farming on wild biota, as well as to provide biological information about the target species. (AU)

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