Length weight relationship of 73 fish species caught in the southeastern inner continental shelf region of Brazil

Abstract

ABSTRACT. The a and b parameters of the length-weight relationship (LWR) of the form W = aL b were estimated for 71 species of Actinopterygii and 2 Elasmobranchii, caught in the coastal region and inner shelf of southeastern Brazil. Estimates of b varied from 2.151 to 3.882. For the first time LWR for eight fish species is reported. Significant differences were observed among b values obtained for the same species caught in different ecosystems. Moreover, significant different results for b were observed among species caught in different ecosystems and between sexes of 12 species. Therefore, in order to obtain a reliable biomass estimate it is necessary to choose LWR data close in time and region with estimates for each sex.

Ontogenetic and sexual variation in the sagitta otolith of Menticirrhus americanus (Teleostei; Sciaenidae) (Linnaeus, 1758) in a subtropical environment

“…Avulsos Zool., 2020;v.60: e20206009 8/12 for other marine species (Volpedo & Echeverría, 1999;Vignon, 2012;Carvalho et al, 2015). Menticirrhus americanus is a species of isometric positive growth (b > 3) (Dias et al, 2014;Froese & Pauly, 2017), this characteristic is corroborated by the otolith growth change, which stops growing in the dorsoventral axis and begins to grow in the anteroposterior axis as also observed for Paralonchurus brasiliensis, another species belonging to the family Sciaenidae (Oliveira et al, 2009). According to Avigliano et al (2012), elliptic otoliths are correlated with species that inhabit more saline environments, as is the case of the M. americanus otolith that has elliptic otoliths and has a preferential environment estuarine mouths and shallow internal shelf (Barletta et al, 2008).…”

Length-weight relationships and condition factors of the whitespotted grouper Epinephelus coeruleopunctatus in the coastal waters of Padang City, Indonesia

“…The study revealed that the whitespotted grouper had the negative allometric growth pattern. The negative allometric growth pattern was also detected in several species of marine species, for example for Mugil cephalus and Ambassis koopsii in Gigieng estuary, Indonesia (Mulfizar et al, 2012), Chilomycterus spinosus in the southern Brazil waters (Dias et al, 2014), Carangidae in Mediterranean Sea (Tsagarakis et al, 2015), whereas the positive growth pattern was reported in Anchoviella lepidentostole and Anchoviella lepidentostole (Dias et al, 2014), Lepidorhombus boscii, L whiffiagonis, Platichthys flesus, P. lascaris, Solea solea, Epinephelus marginatus, E. aeneus and E. costae (Tsagarakis et al, 2015) and Leiognathus fasciatus in Gigieng estuary, Indonesia (Mulfizar et al, 2012). In general the body weight condition factor of whitespotted grouper tends to 100, indicate there is a balance between prey and predator (Anderson and Neumann, 1996).…”

Length-weight relationships of fish from Madeira River, Brazilian Amazon, before the construction of hydropower plants

“…In some cases, it is easier to take measurements of weight rather than length; for example, in cephalopod species (Bello, ). However, in most fish and fisheries, weighing each organism individually under field conditions is very difficult; here, weight data can be converted to length by using the LWR (Dias et al., ).…”