Department of Biological Sciences, São Paulo State University, Botucatú, Brazil.
Fisheries and Aquatic Sciences Program, School of Forest Resources and Conservation, University of Florida, Gainesville, Florida, USA.
J Fish Biol. 2019 Nov;95(5):1236-1248. doi: 10.1111/jfb.14123. Epub 2019 Sep 4.
The age and growth of three endemic threatened guitarfish species were analysed using vertebrae of Pseudobatos horkelii, P. percellens and Zapteryx brevirostris. Edge and marginal-increment analyses were used to evaluate the periodicity of the formation of the band-pairs, suggesting deposition of one band-pair per year, from late winter to late spring. The von Bertalanffy growth model was used to describe the growth of these species with the following parameters, for pooled sexes: P. horkelii L = 126.93, k = 0.19 and t = -1.51; P. percellens L = 109.31, k = 0.16 and t = -1.78; Z. brevirostris L = 60.37, k = 0.24 and t = -1.42. Our results are essential to understanding the resilience and vulnerability of these species to harvest, which can contribute to management and conservation actions of these species.
利用尖齿锯鳐属的 Pseudobatos horkelii、P. percellens 和 Zapteryx brevirostris 的脊椎骨分析了这三种特有濒危吉他鱼的年龄和生长情况。边缘和边缘增量分析用于评估形成条带对的周期性，表明每年从冬末到春末沉积一对条带。von Bertalanffy 生长模型用于描述这些物种的生长情况，其参数为：P. horkelii L = 126.93、k = 0.19 和 t = -1.51；P. percellens L = 109.31、k = 0.16 和 t = -1.78；Z. brevirostris L = 60.37、k = 0.24 和 t = -1.42。我们的研究结果对于了解这些物种对捕捞的恢复力和脆弱性至关重要，这有助于这些物种的管理和保护措施。
