Population structure and reproductive indicators of Genyatremus luteus (Pisces: Haemulidae) in the Brazilian Amazon coast
2025
L. N. Silva | J. A. S. Ramos | Y. B. S. Nunes | L. R. Silva | M. B. Aranha | D. C. Batalha | M. B. Figueiredo
Abstract Genyatremus luteus primarily inhabits estuarine regions and holds significant commercial value along the Brazilian Amazon coast. This study aimed to investigate the population structure and reproductive biology of G. luteus caught in the Paciência River estuary, in the state of Maranhão. Approximately 30 specimens were collected monthly from November 2015 to October 2017, totaling 475 individuals (295 females and 180 males). The sex ratio differed significantly over the study period, at 1.6F:1M (χ2 = 84.3; df = 10; p < 0.05). The mean length at first sexual maturity was 12.66 cm for females, 12.32 cm for males, and 12.56 cm for combined sexes, exhibiting negative allometric growth (b < 3) with peaks in the condition factor of 2.04 and 1.30 for females and males, respectively. Females showed a broader length range (23.16 ± 3.97 cm), possibly attributed to a reproductive strategy to ensure species perpetuation. These findings contribute to optimizing fisheries management strategies, ensuring that individuals can reproduce before being caught. Additionally, analyzing seasonal reproductive patterns relative to environmental variables, such as rainfall, offers deeper insights into how external factors influence reproductive cycles and population dynamics.
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