Abstract
Abstract: The length-weight relationship (LWR) and diet of a small trichomycterid catfish, Cambeva guareiensis, was studied based on 58 specimens captured in Corrente stream, Guareí River basin, São Paulo, Brazil. LWR analyses showed values of a ranged from 0.0097 to 0.0149 and b from 2.858 to 3.250. The analysis of the diet showed that high amounts of aquatic insects (93.75% of total items) were consumed by the species. In addition, we found no statistically significant differences when comparing the diet between the dry and rainy periods. Our study contributes to the knowledge on populational biology and feeding ecology of trichomycterid fishes in Brazilian streams.
Highlights
The Trichomycteridae family—comprising siluriforms of freshwater ecosystems—holds a wide geographic distribution in South America; occurring, for example, from Andean to Brazilian waterbodies (e.g., Fernández & Vari 2009; Reis et al 2019; Katz & Costa 2020)
The value of b found for Cambeva guareiensis was 3.054 (2.858-3.250)
Many stream fish species are expected to have b values in a similar range as that found for C. guareiensis and other trichomycterids (Froese 2006)
Summary
The Trichomycteridae family—comprising siluriforms of freshwater ecosystems—holds a wide geographic distribution in South America; occurring, for example, from Andean to Brazilian waterbodies (e.g., Fernández & Vari 2009; Reis et al 2019; Katz & Costa 2020). In the southeast of the country, many species of Cambeva and Trichomycterus have been reported (e.g., Casatti 2002; Lima et al 2008; Barbosa & Azevedo-Santos 2012; Katz et al 2018; Cetra et al 2020; Reis et al 2020; Costa & Katz 2021). In just the Paranapanema River system (Upper Paraná River, Brazil), for instance, there were reported C. davisi (Haseman, 1911), C. diabola (Bockmann, Casatti & de Pinna, 2004), C. guareiensis Katz & Costa, 2020, C. pascuali (Ochoa, Silva, Silva, Oliveira & Datovo, 2017), and C. perkos (Datovo, Carvalho, & Ferrer, 2012) (Katz & Costa 2020). In particular, occurs exclusively in small tributaries of sub-basins of the Paranapanema River system (Katz & Costa 2020; Azevedo-Santos et al 2020a; Lisboa et al 2020)
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