Nicole Suárez-Aguilar, Fernanda Zambrano-Cedeño, Mendoza-Nieto Klever, Briones-Mendoza Jesus
Carrera de Biología, Facultad de Ciencias de la Vida y Tecnologías, Universidad Laica "Eloy Alfaro" de Manabí, Ciudadela Universitaria vía San Mateo, Manta, Ecuador.
J Fish Biol. 2024 Jul;105(1):34-45. doi: 10.1111/jfb.15755. Epub 2024 Apr 15.
The blue shark Prionace glauca plays a critical role as a predator in marine ecosystems but is threatened by by-catch. To obtain more precise biological data, a Bayesian approach was used, and 536 vertebrae samples collected during 1 year at the landing stage called "Playita Mía" Manta, Ecuador, were analysed. The objective was to estimate the age and growth parameters of the species. The size of the specimens varied between 116 and 310 cm in total length (TL). Using a Bayesian approach based on the Markov Chain Monte Carlo (MCMC) method, growth parameters were evaluated. The von Bertalanffy model was the one that best fitted the data and provided more adequate estimates (females: = 325.50 cm, = 53.23 cm, and k = 0.12 years; males: = 331.47 cm, = 51.59 cm, k = 0.12 years -1; combined sexes: = 329.65 cm, = 53.64 cm, k = 0.11 year-1). The results indicated that females and males have a similar growth, and that the species has a slow growth. Further studies using multi-model Bayesian approaches and covering a broader range of sizes in the Pacific Ocean are suggested. These studies will provide crucial information for the management and conservation of this species.
大青鲨（Prionace glauca）作为海洋生态系统中的捕食者发挥着关键作用，但却受到兼捕的威胁。为了获取更精确的生物学数据，采用了贝叶斯方法，并对在厄瓜多尔曼塔的“Playita Mía”上岸阶段一年内收集的536个脊椎样本进行了分析。目的是估计该物种的年龄和生长参数。样本的全长在116至310厘米之间变化。使用基于马尔可夫链蒙特卡罗（MCMC）方法的贝叶斯方法评估生长参数。冯·贝塔朗菲模型最适合数据并提供了更合适的估计值（雌性：L∞ = 325.50厘米，L0 = 53.23厘米，k = 0.12年；雄性：L∞ = 331.47厘米，L0 = 51.59厘米，k = 0.12年-1；雌雄混合：L∞ = 329.65厘米，L0 = 53.64厘米，k = 0.11年-1）。结果表明，雌性和雄性生长相似，且该物种生长缓慢。建议进一步开展使用多模型贝叶斯方法并涵盖太平洋更广泛尺寸范围的研究。这些研究将为该物种的管理和保护提供关键信息。
