Length-weight relationships of fish from Madeira River, Brazilian Amazon, before the construction of hydropower plants

Abstract

Length-weight relationships (LWRs) are presented for 112 freshwater fish species representing 23 families and five orders captured in the Madeira River, the largest white-water river tributary of the Amazon River. The allometry coefficient (b) of the LWR (Wt = aSL b ) ranged from 2.446 to 3.856 with a median value of 3.102. Eight new LWR records are presented for Amazonian species as information for FishBase. LWRs in the present study provide historical data on a and b coefficients prior to the damming of the Madeira River in November 2011, allowing comparison estimates of predicted future population parameters as influenced by human intervention.U.S.

Length–weight relationships of eight fish species from Guyana coastal drainages, Amapá, Brazil

“…These data can be useful for fisheries research and stock management, and also fill in gaps about the understanding of the local ichthyofauna. However, despite the recent increase of published LWR studied for Amazonian fishes (e.g., Freitas et al, ; Cella‐Ribeiro, Hauser, Nogueira, Doria, & Torrente‐Vilara, ; Giarrizzo et al, ), including studies in the same aquatic biogeographic region (Nobile et al, ; Sá‐Oliveira, Angelini, & Isaac‐Nahum, ), there is still much work to be done considering that the Amazon basin comprises the most diverse freshwater fish fauna in the world (Reis et al, ). It is especially true for low commercial interest species (Freire, Rocha, & Souza, ), such as those reported herein.…”

Length-weight relationship and condition factor for twelve fish species from the Igarapé Fortaleza basin, a small tributary of the Amazonas River estuary

“…LWR studies for freshwater fish species from the Amazonas River basin have increased, providing important biological information on fish populations (e.g. Freitas et al 2014;Silva et al 2015;Giarrizzo et al 2015;Cella-Ribeiro et al 2015;Dieb-Magalhães et al 2015;Freitas et al 2017). However, there still are large gaps in the geographical coverage of biological data for many fish widely distributed in the Amazon basin.…”

“…These lower b values for A. tetramerus and A. nuchalis and higher values for T. galeatus may be due to various factors. The growth type of fish species can be changeable, depending on the season, food availability, population, sex or physiology (Silva et al 2015;Giarrizzo et al 2015;Cella-Ribeiro et al 2015;Dieb-Magalhães et al 2015;Freitas et al 2017). Therefore, more data, from a larger sample size, are needed to confirm these extreme growth pattern values.…”

Length‐weight relationships of fish species from oxbow lakes on the floodplain of the middle Purus River in western Brazilian Amazon

“…Length‐weight relationships have been widely used in fisheries research (Cella‐Ribeiro, Hauser, Nogueira, Doria, & Torrente‐Vilara, ; Chuctaya, Capitani, Faustino, & Castro, ; Froese, ; Giarrizzo, Bastos, & Andrade, ) and this parameter permits the evaluation of the growth patterns of the populations, as well as the estimation of the condition factor and biomass. These data are fundamental to the sustainable use and management of fish populations.…”