Length‐weight relationship of fish species from Central Amazon floodplain

Abstract

Length-weight relationship (LWR) is likely the most useful tool to estimate indirect growth, body condition, and to understand the life cycle of fishes (Camara, Caramaschi, & Petry, 2011; Froese, 2006). Length and weight are biometrics data easily taken and available in most datasets from monitoring studies. Despite the simplicity, it provides highly useful information for fisheries management and can be used in different applications like the estimation of biomass from length data or comparisons between growth patterns and morphologic differentiation of the same species from different populations (Imorou, Alphonse, Edmond, & Youssouf, 2019; Karachle & Stergiou, 2012). The Amazon basin shelters a very highly diverse freshwater fish fauna that occupy a wide variety of environments. The middle stretch of the Amazon River sustains very important fishery activities, which targets about 100 species coming from its main channel and associated floodplain environments (Santos, Ferreira, & Zuanon, 2006). Here we present LWRs for 39 fish species based on 18 years of monthly fish sampling in the Catalão Lake, at the confluence of Amazonas and Negro rivers.

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.…”

Length‐weight relationship of six small fish species from the Negro River basin in the Brazilian Amazon

“…Fish weight and length data are basic biometric parameters measured during the fishing monitoring process (Zuchi et al., 2020). This information allows us to estimate indirect growth, body condition and biomass (based on the length frequency distribution), and results of such data sets allows us in conjunction with the determination of other essential parameters to understand the life cycle of fishes (Camara et al., 2011; Froese, 2006; Le Cren, 1951; Oliveira et al., 2020).…”

Length‐weight relationship of 12 species of freshwater fish caught in the middle and lower stretches of the Negro River basin, Brazilian Amazon

“…The measurement of these biometric data (weight and length) is routine in studies that monitor fauna and, according to Zuchi et al. (2020), these data are easily obtained.…”

“…Length-weight relationship (LWR) can be used to estimate the weight or length of fish species when only one of these values is known. The measurement of these biometric data (weight and length) is routine in studies that monitor fauna and, according to Zuchi et al (2020), these data are easily obtained.…”

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Length-weight relationship (LWR) can be used to estimate the weight or length of fish species when only one of these values is known. The measurement of these biometric data (weight and length) is routine in studies that monitor fauna and, according to Zuchi et al (2020), these data are easily obtained.The Negro River is the second largest sub-basin of the Amazon basin (Goulding et al, 2003). In this sub-basin, currently 1,233 species are known (Jézéquel et al, 2020) to inhabit different environments such as rivers, lakes, flooded forests (igapós), beaches, intersecting river channels (paranás) and streams (igarapés) (Beltrão et al, 2019).

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