Length-weight relationships of 18 fish species from the Siluriformes order in a hydrographic subtropical basin in southern Brazil

Abstract

The present paper describes the length-weight relationship of 18 fish species from the Siluriformes order in a subtropical basin, southern Brazil. U.S.

Ichthyofauna of the hydrographic basin of the Chasqueiro Stream (Mirim Lagoon system, southern Brazil): generating subsidies for conservation and management

“…We are grateful to SISBIO license for the field collection, Mirim Lagoon Agency (ALG) and Coordenacão de Aperfeic¸oamento de Pessoal de Nível Superior (CAPES) in terms of field study and financial support. In 1977, a dam was constructed to prevent the entry of salt water into the region of Mirim Lagoon, the main water source used for agriculture, particularly for rice cultivation , Mouchet et al 2012, Corrêa et al 2015).…”

“…The following apparatuses were used: a) gill net: 75 m long with 10 meshes; 20, 30, 40 and 50 mm (knot to knot) submerged for a period of 24h (checked after 12h); used in reservoir depths between 1.0 and 2. Ichthyofauna of the hydrographic basin of Chasqueiro stream Corrêa et al 2015). The hydrographic system of Mirim Lagoon is Brazil and Uruguay (Kotzian & Marques 2004).…”

“…In 1977, a dam was constructed to prevent the entry of salt water into the region of Mirim Lagoon, the main water source used for agriculture, particularly for rice cultivation , Corrêa et al 2015.…”

Length-weight relationship of three cichlid species in a stream in southwestern Amazon, Brazil

“…To calculate the LWRs, the following equation was applied: W = a *L b , where W is the total weight of fish (g), a is the coefficient related to body shape, L is the total length (cm) and b is an exponent that is related to a change in body shape (Froese, ). To adjust the model, PAST 3.0 statistical software ( PAlaeontological STatistics , Hammer, Harper, & Ryan, ) was used, where the parameters ( a ) and ( b ) were estimated by linear regression: log (W) = log ( a ) + b log (L); extreme outlier values were excluded from the analysis (Corrêa, Oliveira, Pouey, et al, ; Froese, ).…”

“…Studies investigating the length–weight relationship (LWRs) of fish in streams are very important, since the results that were obtained can be used in growth analysis, being a tool that can be used in the field when the weight cannot be reliably obtained (Camara, Caramaschi, & Petry, ; Corrêa, Oliveira, Pouey, & Piedras, ; Freitas, Prudente, Fontoura, & Montag, ; Freitas, Souza, Prudente, & Montag, ; Froese, ; Rosa, Soares, Albrecht, & Caramaschi, ).The Neotropical region presents the highest diversity of freshwater fish species in the world, with estimates of 7,000 species (Albert & Reis, ). Brazil has in its water systems around 2,500 freshwater fish species (Reis, Kullander, & Ferraris, ; Buckup, Menezes, & Ghazzi, ), which is highly related to the diversity of aquatic ecosystems, with an emphasis on the Amazon biome that presents the greatest diversity of fish in the world (Winemiller et al , ).…”