Length‐weight relationships of five fish species from lakes of the Central Amazonian floodplains

Abstract

Parameters of the length‐weight relationship (LWR) were calculated for five fish species from Amazon Basin. Samplings were carried out in ten lakes of the Solimões River floodplains during the four seasons of the hydrological cycle: rising water, high water, receding water, and low water, during two periods. The first period of eight years included samplings performed from 2001 to 2008 and the second sampling period of two years was from 2012 to 2013. Specimens were captured using gillnets (mesh sizes ranging from 30 to 120 mm between opposite knots) and standardized dimension of 20 m in length × 2 m in height. This study provides the LWR parameters for Acarichthys heckelii, Leporinus trifasciatus, Brycon amazonicus, Curimatella meyeri and Osteoglossum bicirrhosum.

Length‐weight relationship of 16 fish species from the Negro River basin (Amazonas state, Brazil)

“…Of all 16 records presented here, and currently shown on Fishbase, the available values of the LWR parameters for these species are based on Bayesian predictions. However, LWR estimates have already been published elsewhere for Hemiodus atranalis (Giarrizzo et al., 2011), Chalceus erythrurus (Chuctaya et al., 2017; Zuchi et al., 2020), Tetragonopterus argenteus (Garcia‐Ayala et al., 2017; Vicentin et al., 2018), Acarichthys heckelii (Matos et al., 2019) and Plagioscion montei (Zuchi et al., 2020). However, for the other species, such data are not published.…”

“…The values of a and b published for these five species are not similar to those found in the study, since they present lower and higher values. However, these differences can be explained mainly as being due to differences in environment, capture methods used and the sample number (Matos et al., 2019; Oliveira et al., 2020; Prestes et al., 2019). There is a need to standardize the methods of capture in order to encourage the regular monitoring of the fish assemblages, and by adding these data we can generate more accurate assessments of the fishing stock of a given region.…”

“…The Amazon Basin is a huge ecosystem composed of many river sub‐basins. Currently, most length‐weight relationships of the fish species studied are based on individuals collected in the Amazon River (Freitas et al., 2017; Oliveira et al., 2020), Solimões River (Dieb‐Magalhães et al., 2015; Matos et al., 2019; Sampaio et al., 2019; Tribuzy‐Neto et al., 2015, 2018; Villacorta‐Correa & Saint‐Paul, 1999), Madeira River (Cella‐Ribeiro et al., 2015) and Xingu River (Giarrizzo et al., 2015). Thus, few studies using this approach analyze species collected in the Negro River basin, which is the second largest sub‐basin of the Amazon basin (Goulding et al., 2003).…”

Length‐weight relationship of fish species from Central Amazon floodplain

“…This study provides new LWR records for 32 fish species from the Central Amazonian river-floodplain system, which represent an important increase in the scientific information available for fishes from the region (Bevilaqua & Soares, 2010;Dieb-Magalhães, Florentino, & Soares, 2015;Matos et al, 2019;Prestes, Soares, Silva, & Bittencourt, 2010;Sousa, Soares, & Prestes, 2013), as well as for the international literature. From all records presented here, LWR estimates for Cichla monoculus and Pterygoplichthys pardalis can be found at FishBase, however, we opted to keep these two species in the study because the published record for the first species was based on three specimens only, and for the second, refers to an introduced population in the Philippines (Jumawan & Seroney, 2017), as opposed to our findings that are based on natural populations (Ferraris-Jr, 2007).…”

“…From all records presented here, LWR estimates for Cichla monoculus and Pterygoplichthys pardalis can be found at FishBase, however, we opted to keep these two species in the study because the published record for the first species was based on three specimens only, and for the second, refers to an introduced population in the Philippines (Jumawan & Seroney, 2017), as opposed to our findings that are based on natural populations (Ferraris‐Jr, 2007). Our study also considers another seven species which LWR estimates have already been published elsewhere, however, we decided to present the information here because they bring new records on the maximum length, were based on a larger number of specimens and showed better size range: Heros efasciatus (Sampaio, Aguiar‐Santos, Anjos, Freitas, & Siqueira‐Souza, 2019), Curimatella meyeri (Matos et al., 2019), Cichlasoma amazonarum (Sampaio et al, 2019), Acestrorhynchus abbreviatus, Anadoras grypus, Chalceus erythrurus, and Pterygoplichthys pardalis (the four species on Chuctayal, Capitani, Faustino, & Castro, 2017).…”