J Appl Ichthyol 2017; 1–4 wileyonlinelibrary.com/journal/jai | 1 © 2017 Blackwell Verlag GmbH Received: 5 March 2016 | Accepted: 26 September 2016 DOI: 10.1111/jai.13265 TECHNICAL CONTRIBUTION Length–weight relatonships for 35 fsh species of the Atlantc Forest, SP/RJ—Brazil F. P. Lima 1 | A. B. Nobile 1 | D. Freitas Souza 1 | C. A. Siqueira 2 | C. A. Lemos 2,3 | B. Abreu-Santos 2 | J. A. P. Santos 2,3 1 Laboratório de Biologia e Genétca de Peixes, Departamento de Morfologia, Insttuto de Biociências (IBB), Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Botucatu, SP, Brazil 2 Laboratório de Peixes Contnentais, Núcleo de Ecologia Aquátca, Universidade Santa Boqueirão, Santos, SP, Brazil 3 Departamento de Hidrobiologia, Universidade Federal de São Carlos, São Carlos, SP, Brazil Correspondence Felipe Ponteri Lima, Laboratório de Biologia e Genétca de Peixes, Departamento de Morfologia, Insttuto de Biociências (IBB), Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Botucatu, SP, Brazil. Email: fpl.limao@hotmail.com Summary Length–weight relatonships (LWRs) for 35 freshwater fsh species from the SP/RJ coastal basin in Brazil are presented in this paper. Fishes were captured between 2011 and 2015 on an irregular basis using electrofshing, sieves, trawl nets, cast nets and fsh-traps. In this study new LWRs are reported for 28 species, plus the total weight and length for 34 and nine species, respectvely. The study provides new informaton on less-studied species and can serve as a basis for management and conservaton in this area. 1 | INTRODUCTION The length–weight relatonships (LWRs) are useful tools for fsh ecol- ogy, fsheries resource assessment and fsheries management (Froese, 2006). They can be used to compare the conditon factor and ontoge- netc allometric changes in diferent populatons, to estmate the aver- age weight for a given length group and to convert length observatons into weights to provide a measure of biomass (Froese, 2006; Froese, Tsikliras, & Stergiou, 2011). Although easily obtained, LWRs data are scarce for several species in the Neotropical region, mainly for those species in coastal basins, when compared to other Brazilian basins (Froese, 1998; Froese & Pauly, 2015). Thus, the objectve of this study was to provide LWRs for 35 fsh species from the basins in the Atlantc south and southeast that are present in the Atlantc Forest ecosystem. 2 | MATERIAL AND METHODS 2.1 | Sampling procedure Fishes were collected between 2011 and 2015 in 90 locatons of 11 countes of the São Paulo and Rio de Janeiro states, between coordinates 24°29′75.74″S, 47°10′34.04″E and 23°70′72.35″S, 45°86′85.70″E, by electrofshing, sieving, trawl nets, cast nets and fsh-traps. The samples were stored in the ichthyologic collecton of the Laboratório de Peixes Contnentais of Santa Cecília University. Specifc keys (Eigenmann, 1921; Géry, 1977; Lucinda, 2008; Oyakawa, Akama, Mautari, & Nolasco, 2006) were used to identfy the fshes. The weight (Wt) in grams (.1 g) and standard length (SL) in cen- tmeters (.1 mm) for each specimen were obtained. Scientfc names, authors, years and family assignments were checked against FishBase (Froese & Pauly, 2015). LWR parameters were also compared with the Bayesian LWR predictons according to Froese, Thorson, and Reyes (2014). 2.2 | Data analysis The linear regression: log WT − log a + b log SL, where WT is the total weight in grams, SL is the standard length in cm, ‘a’ is the intercept and ‘b’ is the slope of the linear regression utlized to determine the LWRs. Outliers were excluded using a log WT–log SL plot (Froese, 2006; Nobile et al., 2015).