Age and growth of three endemic threatened guitarfishes Pseudobatos horkelii, P. percellens and Zapteryx brevirostris in the western South Atlantic Ocean

• Autor(a) principal: Caltabellotta, Fabio P. [UNESP]
• Data de Publicação: 2019
• Outros Autores: Siders, Zachary A., Murie, Debra J., Motta, Fabio S., Cailliet, Gregor M., Gadig, Otto B. F. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1111/jfb.14123; http://hdl.handle.net/11449/197314
• topic: fisheries management; growth modelling; life history; population dynamics; shark-like batoids

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-infinity = 126.93, k = 0.19 and t(0) = -1.51; P. percellens L-infinity = 109.31, k = 0.16 and t(0) = -1.78; Z. brevirostris L-infinity = 60.37, k = 0.24 and t(0) = -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.