Population structure and reprodutive aspects of the freshwater shrimp Macrobrachium potiuna in the paranapanema river, SP
DOI:
https://doi.org/10.18554/acbiobras.v9i00.8759Keywords:
Crustacean, Sexual maturity, Reproduction, Juvenile recruitmentAbstract
Freshwater crustaceans are known for their ecological and economic importance, playing essential roles in aquatic ecosystems. This study aimed to provide information on the population structure and reproductive characteristics of Macrobrachium potiuna in the Paranapanema River (SP). Collections were carried out between June 2023 and May 2024. 224 individuals were collected (65.63% juveniles; 22.32% females; 12.05% males). Juvenile recruitment occurred primarily during the winter (n = 54). Total length ranged from 1.19 to 4.54 cm. Individual sexual maturity was observed at 2.72 cm in total length, while population sexual maturity occurred between 2.72 and 2.90 cm. Juveniles and males showed uniform growth, while females exhibited non-uniform development. Ovigerous females showed homogeneous growth. Reproduction and spawning occurred mainly in spring and summer, extending into autumn. The sex ratio was approximately 1.85 females to each male. Macrobrachium potiuna population presented seasonal variations in reproductive periods and juvenile recruitment, and that water temperature, conductivity, and pH factors did not significantly influence reproduction. Further studies may provide a better understanding of the population dynamics of this species.
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