Abstract
The continuous interference of human activities in continental aquatic systems results in direct and indirect impacts, with consequences for water quality, aquatic biota and the dynamics of water resources. In this context, the Tucuruí Hydroelectric Power Plant (HPP) acquired relatively importance, as it was the first large dam carried out in the Amazon, in the 1980s, presenting important technical/economic results to justify the environmental costs associated with the project. The objective of this study was to apply a new methodology to represent through maps georeferencing biological information and evaluate the impact of the dam on the following fish species, which have different physiologies and taxonomies, in addition to not having much biological information about the species: Botinho (Hassar wilderi, Doradidae), Mandubé (Ageneiosus ucayalensis, Auchenipteridae), Sardinha Papuda (Triportheus trifurcatus, Characidae) and Uéua Cachorrinho (Acestrorhynchus falcirostris, Acestrorhynchidae). The condition factor related to the relationship between the individual's weight and body length, which derives from an expansion of the cubic law of living beings, being very important in ecological studies, even though they depend on simple to the most complex scientific methods, to estimate this bodily condition. Furthermore, this biological parameter influenced by environmental conditions and characteristics, due to food availability and ecological relationships in the environment. This information can support an adequate fisheries management, as there is an integration of fisheries biology and the characteristics of the environment in which they live. Thus, the methodology applied in this study was successful in its application proposal.
Highlights
The constant interference of human activities in continental water systems, results in direct and indirect impacts on water quality, aquatic biota and the functioning of lakes, rivers, dams, between others
The Tucuruí Hydroelectric Power Plant (HPP) has grown in importance because it was the first large dam built in the Amazon, in the 1980s, and presented technical and economic results sufficiently significant to justify a comprehensive analysis of the ratio between the benefits produced and the high environmental costs associated with the project (Eletronorte, 2007)
This study aims to present, using a new methodology for georeferenced maps, data on the condition factor of the four fish species that occur in the area of influence of the Tucuruí reservoir, Brazil
Summary
The constant interference of human activities in continental water systems, results in direct and indirect impacts on water quality, aquatic biota and the functioning of lakes, rivers, dams, between others. The including dams for mining (Carneiro et al, 2019; Barcelos et al, 2020; Reis et al, 2020; Caitano et al, 2021), agriculture, leisure, fish farming, and the construction of dams for hydroelectric plants Its produces changes both qualitative and quantitative in productivity, as well as structural and functional changes in the environmental system (Thornton et al, 1981; Petts, 1984; Straskraba and Tundisi, 2000). The construction of a dam deeply transforms the natural characteristics of a river by reducing the flow speed, changing the water quality and the substrate, among other changes These changes affect all organisms that live in the water, including fish, and it raises greater concern for their importance in both commercial and sport fishing (Petesse and Petrere Jr, 2012; Druzian et al, 2021). The Tucuruí Hydroelectric Power Plant (HPP) has grown in importance because it was the first large dam built in the Amazon, in the 1980s, and presented technical and economic results (electricity production) sufficiently significant to justify a comprehensive analysis of the ratio between the benefits produced and the high environmental costs associated with the project (Eletronorte, 2007)
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