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

Abstract

The main objective of the study was to estimate the parameters of the length‐weight relationship for six small fish species of lower Negro River basin. The fish were sampled using monofilament gillnets (20 × 2 m, mesh size 5 mm between knots), and landing net for 2 days of each month in September and December 2017 and February, March and April 2018. The gillnets were placed in the river twice a day, in the morning (9–11 a.m.) and the afternoon (3–5 p.m.). Total length and total weight were measured to a precision of 0.1 cm and 0.01 g, respectively. The parameters a and b of the equation WT = a.LTb were estimated.

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

“…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 four species of ornamental fish from the lower Rio Negro basin in the Brazilian Amazon

“…The Amazon basin has the greatest diversity of freshwater fish in the world (Oberdorff et al, 2019), where we find many small ornamental fish with different color patterns (Alho, 2008;Moreau & Coomes, 2007;Olentino, Furtado, & Yamamoto, 2020) that are caught mainly in the Rio Negro basin (Zehev, Vera, Asher, & Raimundo, 2015). These species are highly exploited (Araújo, Santos, Rebello, & Isaac, 2017;Ladislau et al, 2020) however few published studies provide the LWR parameters for ornamental species in the Rio Negro region (Barros, Althoff, Pereira, Lazzarotto, & Caramaschi, 2018;Lemos et al, 2015;Olentino et al, 2021;Santos et al, 2012). As such, basic population biology studies, such as LWR, provide information that may help in the conservation of these species.…”

“…Studies on the length-weight relationship (LWR) of fishes have been published in great numbers in recent years (Santos, Sampaio, Barroso, Nunes, & Piorski, 2018;Carvalho, Bot, & Spach, 2020;Lubich, Santos, Freitas, & Souza, 2020;Lubich, Olentino, Freitas, & Yamamoto, 2021;Olentino, Lubich, Leal, & Yamamoto, 2021;Oliveira, Silva, Prestes, & Dias, 2020;Possamai, Passos, & Carvalho, 2020;Prestes, Oliveira, Dias, Soares, & Cunha, 2019). As a result, knowledge about the biology of the species has increased through the analysis of the growth pattern and body conditions, by using the allometric coefficient, and by estimating fish weight based on length and vice versa (Froese, 2006).…”

Length-Weight and Length-Length Relationships and Condition Factor of An Endemic Fish Species (Capoeta tinca (Heckel, 1843)) Inhabiting Bayat Pond (Ankara, TÜRKİYE))

“…Morphometric data and statistical relationships are widely used in fisheries biology studies (Yılmaz et al, 2007;Bostancı et al, 2014;Olentino et al, 2021;Sidiq et al, 2021). Lengthweight relationship parameters calculated using morphometric data are important for fish biology and fisheries management (Garcia et al, 1989;Haimovici and Velasco, 2000;Moutopoulos and Stergiou, 2002).…”