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<p>Estuarine ecosystems support productive bivalve populations with key ecological and socioeconomic roles. <i>Mytella strigata</i> (Bivalvia: Mytilidae) is an important mussel for artisanal fisheries in Northeastern Brazil, yet information on its biometric structure and seasonal growth remains limited. This study evaluated biometric variation, length–weight relationship (LWR), flesh yield, and condition factor of <i>M. strigata</i> in the Goiana River estuary. A total of 994 individuals were sampled between May 2021 and March 2022 during rainy and dry seasons. Shell dimensions and biomass parameters were measured, and seasonal differences were assessed using non-parametric tests. All biometric variables differed significantly between seasons, with higher body mass and condition factor during the dry period. The LWR indicated positive allometric growth (<i>b</i> = 3.12; <i>R</i>² = 0.87), revealing disproportionate biomass increase relative to shell length. Fulton’s condition factor varied significantly among months, reflecting physiological responses to seasonal hydrological conditions. These results contrast with previous reports of negative allometry for this species and suggest favorable trophic conditions in the Goiana estuary. The study provides a baseline for ecological monitoring and supports the use of biometric indicators in the management of tropical estuarine bivalve resources.</p>

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Biometric Relationship of Mytella strigata (Bivalvia: Mytilidae) in a Tropical Estuary in Northeastern Brazil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月11日

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  • Ivo Raposo Gonçalves Cidreira-Neto,
  • Betânia Cristina Guilherme,
  • Gilberto Gonçalves Rodrigues,
  • Ana Lúcia Bezerra Candeias

摘要

Estuarine ecosystems support productive bivalve populations with key ecological and socioeconomic roles. Mytella strigata (Bivalvia: Mytilidae) is an important mussel for artisanal fisheries in Northeastern Brazil, yet information on its biometric structure and seasonal growth remains limited. This study evaluated biometric variation, length–weight relationship (LWR), flesh yield, and condition factor of M. strigata in the Goiana River estuary. A total of 994 individuals were sampled between May 2021 and March 2022 during rainy and dry seasons. Shell dimensions and biomass parameters were measured, and seasonal differences were assessed using non-parametric tests. All biometric variables differed significantly between seasons, with higher body mass and condition factor during the dry period. The LWR indicated positive allometric growth (b = 3.12; R² = 0.87), revealing disproportionate biomass increase relative to shell length. Fulton’s condition factor varied significantly among months, reflecting physiological responses to seasonal hydrological conditions. These results contrast with previous reports of negative allometry for this species and suggest favorable trophic conditions in the Goiana estuary. The study provides a baseline for ecological monitoring and supports the use of biometric indicators in the management of tropical estuarine bivalve resources.