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

Abstract

Summary This study aimed to estimate the parameters of length‐weight relationship for 16 freshwater fish species that inhabit the Aracá and Demeni Rivers, which are two tributaries of the Negro River (Amazonas state, Brazil). The fishes were sampled using gillnets (15 × 2 m, mesh size 30–120 mm between opposite knots), during 6 days each year, in April 2016, November 2018 and April 2019. The gillnets were placed in the river twice each day; in the morning (5–9 a.m.) and in the evening (5–9 p.m.), with a standardized time of 4 hr. Measurements were taken for standard length (SL – 0.1 cm precision) and total weight (TW – 0.01 g precision). The parameters a and b of the equation WT = a.LTb were estimated. This study also provides new data on of maximum lengths for six species, namely, Argonectes longiceps, Hemiodus atranalis, Chalceus erythrurus, Astrodoras asterifrons, Trachydoras steindachneri and Acarichthys heckelii.

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

“…LWR estimates have already been published elsewhere for Hydrolycus wallacei (Lubich et al., 2020) and Ageneiosus polystictus (Freitas et al., 2017). However, our study considers the estimates of these two species here because they bring one new record for the maximum length ( H .…”

“…for the species in this basin (Barros et al, 2018;Lemos et al, 2015;Lubich et al, 2020;Mereles et al, 2020;Olentino et al, 2021;Quara de Carvalho Santos et al, 2012), due to the low fishing intensity and the high costs of research expeditions for sampling fish in this region (Lubich et al, 2020). As such, the present study describes the LWR of 12 freshwater fish species that inhabit lakes in the middle and lower stretches of the Negro River basin (Amazonas State, Brazil).…”

“…Therefore, because they have different characteristics, these environments allow diversification of fish species. Despite the increase in descriptions of new species, there are few studies published that provide information on the parameters of the length‐ weight relationship for the species in this basin (Barros et al., 2018; Lemos et al., 2015; Lubich et al., 2020; Mereles et al., 2020; Olentino et al., 2021; Quara de Carvalho Santos et al, 2012), due to the low fishing intensity and the high costs of research expeditions for sampling fish in this region (Lubich et al., 2020). As such, the present study describes the LWR of 12 freshwater fish species that inhabit lakes in the middle and lower stretches of the Negro River basin (Amazonas State, Brazil).…”

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

“…However, despite the economic and social importance that the capture of small species generates, there are few published studies with information on the length‐weight relationships of fish species from this basin (Barros et al., 2018; Freitas et al., 2017; Lemos et al., 2015; Lubich et al., 2020; Santos et al., 2012). Thus, the description of the length‐weight relationship of six small fish species from the lower Negro River basin, Amazon Basin, Brazil, is presented here.…”

Length‐weight relationships of 10 fish species from the coastal waters of the East China Sea

“…The length‐weight relationship (LWR) offers important biological information for fish species associated with body shape and nutritional conditions (Froese et al., 2011). It has important implications for fishery management and fish population dynamics, which can be used for life‐history and morphology comparison among different populations of different regions, provided all investigations use the same standardized sampling methods (Lubich et al., 2020; Ma et al., 2020).…”