Age and growth of Pacific cownose ray, Rhinoptera steindachneri: a species with intermediate growth and shorter lifespan than expected
Karen A. Pabón-Aldana
A * , Felipe N. Melo-Barrera A , Xchel A. Pérez-Palafox A , Andrés F. Navia B , Víctor H. Cruz-Escalona A and Paola A. Mejía-Falla B C
+ Author Affiliations
- Author Affiliations
A Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, 23096 La Paz, BCS, México.
B Fundación colombiana para la investigación y conservación de tiburones y rayas, SQUALUS, Calle 10A 72-35, 760001, Cali, Colombia.
C Wildlife Conservation Society, WCS Colombia, Avenida 5N 22N-11, 760001, Cali, Colombia.
Marine and Freshwater Research 73(8) 1011-1024 https://doi.org/10.1071/MF21103
Submitted: 23 March 2021 Accepted: 3 May 2022 Published: 14 June 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Rhinoptera steindachneri is the third-most abundant batoid species in the artisanal gillnet fishery of the Gulf of California, but there are limited age and growth data available for management.
Aims: The aim was to estimate age and growth of this species from vertebral centra of 276 individuals.
Methods: Two adjusted data sets were constructed on the basis of the birth and capture months and defining adequately the birth band. Individual growth was described through a multi-model approach and inference by using von Bertalanffy, Gompertz, and Logistic models (two and three parameters), and a two-phase growth model (four and five parameters).
Key results: The model with the best fit to the size-at-age data was the two-phase model for both sexes (females: Dw∞ = 91.21 cm; k = 0.25 year−1, Dw0 = 46.2 cm; males: Dw∞ = 79.1 cm; k = 0.42 year−1, Dw0 = 45.5 cm). Maximum ages ranged from 9.92 to 10.75 years (female) and from 6.92 to 7.67 years (males). Maturity age was estimated in 3.92 years (females) and 3.72 years (males).
Conclusions: Rhinoptera steindachneri is a batoid species with intermediate growth and a shorter lifespan than for confamilial species and even than species with similar reproductive traits.
Implications: The need to carry out age validation studies for this species is highlighted.
Keywords: adjusted ages, batoids, birth band, elasmobranchs, growth models, intrauterine bands, life history parameters, multi-model inference.
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