Population dynamics of a hololimnetic population of the freshwater prawn Macrobrachium amazonicum (Heller, 1862) (Decapoda, Palaemonidae) in southeastern Brazil

Seasonal variation in the population structure of the freshwater prawn Macrobrachium brasiliense (Decapoda: Palaemonidae) in a neotropical region

“…The frequency distribution of males and females of M. brasiliense between the size classes followed a pattern, with a greater number of females in the smallest size classes and a greater number of males in the largest classes, which may be a reflection of the reproductive strategy called "temporary female guarding" (Bauer, 2004), with dominant males that court and protect females during copulation. This model of population structure seems to be a pattern in M. brasiliense, considering all the populations studied so far (Mantelatto and Barbosa, 2005;Pereira and Chacur, 2009;Oliveira et al, 2019), as well as for other Macrobrachium species (Mattos and Oshiro, 2009;Gualberto et al, 2012;Nogueira et al, 2019b;Perroca et al, 2021). Therefore, this type of sexual system appears to be common within the genus, since most populations are characterized by males being larger than females, with males showing aggressive behavior during social interactions (Fielder and Lee, 1983;Karplus et al, 1992;Karplus and Barki, 2019).…”

“…Studies show that the distribution and population structure of freshwater prawns can vary between different locations, with the main factor being the physical and chemical conditions of the environment, which can be influenced by seasonality (Brooks et al, 2005;Barros-Alves et al, 2012;Paschoal et al, 2019;Silva et al, 2020;Macedo et al, 2021;Perroca et al, 2021). Thus, it is essential that studies on the seasonal variation in population structure of different organisms are carried out, in order to understand the effects of climate on such populations, considering that we are living in a time of great climatic changes on a global scale (Jourdan et al, 2018;Souza-Dias et al, 2018).…”

Metal concentrations (Fe and Zn) in Macrobrachium amazonicum from Brazilian Amazon rivers

“…Macrobrachium amazonicum, on the other hand, is a native species that exhibits favorable attributes for captive production. These include high fecundity, a relatively short production cycle, the capacity to endure high densities (up to 80 shrimp per square meter), robustness, and meat that is both firmer and more flavorful than the exotic M. rosenbergii (Araújo et al, 2017;Taddei et al, 2017;Heldt et al, 2019;Brazão et al, 2022;Perroca et al, 2022). M. amazonicum enjoys a widespread distribution in the lower Amazon River regions of Amapá and Pará and does not pose a risk of ecosystem invasion, being native to these areas (Bentes et al, 2011;Da Silva et al, 2016).…”