Abstract
This study reports the importance to evaluate the length-weight relationships (LWR) across the years. We evaluate the LWR for 8 Sciaenidae species of Paranaguá Estuarine Complex, South Brazil, sampled between 2016 and 2018 by bottom trawls similar to the used by artisanal fisheries in this region. There were differences between growth type among the years for 5 species, and all species showed differences in the slope of LWR in at least one year. These results show the importance of fauna and fisheries monitoring programs to better evaluate the population dynamics and fisheries stocks.
 Keywords: estuarine fish, fisheries biology, marine fish, sciaenid, weight-length relationship
Highlights
Length-weight relationship (LWR) is a species-specific biological index very useful in fisheries science and management
We evaluate the length-weight relationships (LWR) for 8 Sciaenidae species of Paranaguá Estuarine Complex, South Brazil, sampled between 2016 and 2018 by bottom trawls similar to the used by artisanal fisheries in this region
Many studies have been shown the LWR for Sciaenidae species and it can be accessed in the FishBase platform (Froese & Pauly, 2020), this relationship is influenced by environmental conditions, interspecific relationships, sex and life stage (Froese, 2006; Nallathambi et al, 2019; Possamai et al, 2019; Possamai; Passos & Carvalho, 2020), and all these features may change across the space and time
Summary
Length-weight relationship (LWR) is a species-specific biological index very useful in fisheries science and management. The length of fishes is usually measured without a purpose; for management uses it is very needed, as well as the body weight (Froese; Thorson & Reyes Jr., 2014). LWR may inform the body and health condition, population growth, ontogenetic changes and is needed to reproductive studies (Le Cren, 1951; Petrakis & Stergiou, 1995; Torres et al, 2017; Possamai et al, 2019). The Sciaenidae family is composed of several economically important species, supporting the majority of artisanal and industrial small-scale fisheries in South Brazil (Vasconcellos; Diegues & Kalikoski, 2011; Haimovici & Cardoso, 2017; Leis; Chuenpagdee & Medeiros, 2019). Many studies have been shown the LWR for Sciaenidae species and it can be accessed in the FishBase platform (Froese & Pauly, 2020), this relationship is influenced by environmental conditions, interspecific relationships, sex and life stage (Froese, 2006; Nallathambi et al, 2019; Possamai et al, 2019; Possamai; Passos & Carvalho, 2020), and all these features may change across the space and time
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