Abstract
The artisanal fishing is an important activity in Billings Reservoir (São Paulo, Brazil) and there is a paucity of biometric data about the fish in this region. Thereby, it is important to provide data about ichthyofauna that can be used for future management actions. The aim of this study was to present some data about the water quality and biometric data on fish species collected at the Bororé site (Billings Reservoir). In general, the obtained hydrochemical data raised a concern about the water quality because some parameters were above the established limit for body water class 2. A total of 170 fish were captured, corresponding to seven species and one genus. Geophagus brasiliensis was the most representative species (36%), followed by Astyanax bimaculatus (25%) and A. eigenmanniorum (20%). The hepatosomatic index (HSI) data showed differences in energy displacement between the species; the highest HSI values were observed in Hoplias malabaricus (HSImale = 1.33 ± 0.20; HSIfemale = 1.17 ± 0.82) while the smallest HSI was observed in A. fasciatus (HSImale = 0.47 ± 0.14; HSIfemale = 0.68 ± 0.35).
Highlights
Several freshwater ecosystems in tropical regions are subjected to anthropic disruptions, which promote the degradation of the water quality and the ecological patterns of resident species (Heath, 1990; Ogashawara et al, 2014; Ribeiro et al, 2020)
The aim of this study was to present some data about the water quality and biometric data on fish species collected at the Bororé site (Billings Reservoir)
The hepatosomatic index (HSI) data showed differences in energy displacement between the species; the highest HSI values were observed in Hoplias malabaricus (HSImale= 1.33 ± 0.20; HSIfemale= 1.17 ± 0.82) while the smallest HSI was observed in A. fasciatus (HSImale= 0.47 ± 0.14; HSIfemale= 0.68 ± 0.35)
Summary
Several freshwater ecosystems in tropical regions are subjected to anthropic disruptions, which promote the degradation of the water quality and the ecological patterns of resident species (Heath, 1990; Ogashawara et al, 2014; Ribeiro et al, 2020). The first group of species to be introduced were carp (Cyprinus carpio) and tilapia (Tilapia rendalli and T. melanopleura) Some migratory species such as dorado (Salminus brasiliensis), guinea fowl (Pseudoplatystoma corruscans) and jurupocas (Hemisorubim platyrhychos) had their reproductive routes altered due to the barring of the courses of large rivers; this contributed to the reduction of the species in the Billings Reservoir, giving way to more sedentary species, mainly traira (Hoplias malabaricus), cara (Geophagus brasiliensis), lambaris (Astyanax bimaculatus, A. fasciatus, A. eigenmanniorum) and catfish (Rhamdia sp.) (Rocha et al, 1985). According to Froese and Pauly (2019), these species are of commercial interest for ornamental fishkeeping (one of the most popular hobbies in the world), aquaculture and/ or artisanal fishing. They have specific eating habits and range from carnivorous species such as H. malabaricus, to omnivores such as Astyanax sp
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