Length/weight relationship and condition factor of Macrobrachium jelskii (Miers, 1877) and M. brasiliense (Heller, 1862) (Decapoda, Palaemonidae) in two locations in the state of São Paulo

Abstract

This study describes the weight vs. carapace length relationship and provides the total and monthly condition factor values for populations of Macrobrachium jelskii (Miers, 1977) and related to the climatic environmental factors between the two areas. Our investigation sampled M. jelskii from the Barra Mansa Dam, Mendonça, SP, a semilotic environment with greater resilience than the Talhadinho Stream, Talhado, SP, a lotic environment where specimens of M. brasiliense were captured. Individuals were classified according to sex and measured at the carapace length (CL) and weighed (WE). The relationship WE/ CL was analyzed by dispersion diagrams of the empirical points, which were set to the power function (WE = a.CL b ). Values of the mean condition factor were compared monthly. In total, 1493 individuals of M. jelskii and 843 individuals of M. brasiliense were captured. Analyses of the constant allometry revealed that both sexes of M. jelskii, as well as females of M. brasiliense grow proportionately more in size than weight. The results concerning the morphometric aspects studied in both species suggest an association with the reproductive processes.

Population structure and fecundity of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) on the Batateiras River, sub-basin of the Salgado River, in southern Ceará, Brazil

“…The sexual size dimorphism found in the present study, where females are morphometrically larger than males, is widely known for M. jelskii (Barros-Alves et al, 2012;Rocha and Barbosa, 2017;Taddei et al, 2017a;Silva et al, 2019a;Nascimento et al, 2020). This pattern can be explained by the evolution of reproductive strategies for M. jeslkii.…”

“…Corroborating our results of sexual size dimorphism and morphological sexual maturity, we can highlight the absence of males in the largest size classes for the population studied, as well as the greater abundance of ovigerous females in the largest size classes. This is demonstrated by the female dominance in these classes, a pattern well recorded in M. jelskii (Barros-Alves et al, 2012;Rocha and Barbosa, 2017;Taddei et al, 2017a).…”

Male morphotypes of the freshwater prawn Macrobrachium brasiliense (Decapoda: Caridea: Palaemonidae)

“…Most studies of M. brasiliense addressed its population ecology (García‐Davílla, Alcantara, Vasquez, & Chujandama, ; Mantelatto & Barbosa, ; Oliveira, Sant'anna, & Hattori, ), and there are few published distribution records (García‐Davílla & Magalhães, ; Santos, Castro, & Magalhães, ). Despite the species' wide distribution, there have been few taxonomic reviews (Coelho & Ramos‐Porto, ; Pileggi & Mantelatto, ) and few studies of other aspects of the species' biology such as behavior (Nogueira, Costa, & Almeida, ), feeding behavior (Melo & Nakagaki, ), mass‐length relationships or other measures of physiological condition (Taddei et al, ), reproductive potential (Oliveira, Sant'anna, & Hattori, ), or larval morphology (Pantaleão, Gregatti, Taddei, & Costa, ).…”

“…. Despite the species' wide distribution, there have been few taxonomic reviews (Coelho & Ramos-Porto, 1984;Pileggi & Mantelatto, 2012) and few studies of other aspects of the species' biology such as behavior (Nogueira, Costa, & Almeida, 2018), feeding behavior (Melo & Nakagaki, 2013), mass-length relationships or other measures of physiological condition (Taddei et al, 2017), reproductive potential (Oliveira, Sant'anna, & Hattori, 2017), or larval morphology (Pantaleão, Gregatti, Taddei, & Costa, 2011).…”

Morphometric differences between two exotic invasive freshwater caridean species (genus Macrobrachium)

“…There are around 20 species registered in Brazil (Mantelatto et al 2016), from which several are among the most economically important ones, such as Macrobrachium carcinus (Linnaeus 1758), Macrobrachium acanthurus (Wiegmann 1836) and Macrobrachium amazonicum (Heller 1862), (Valenti 1985), and the exotic invasive species Macrobrachium rosenbergii (De Man 1879), which was accidentally introduced as a consequence of their cultivation (Iketani et al 2016). Macrobrachium specimens are used as a protein resource by human obtained in nature-fishing activities or shrimp farming (Maciel and Valenti 2009;Bentes et al 2014;Costa et al 2016;Taddei et al 2017a).…”