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RESEARCH ARTICLE
Contents Vol 31(3)

Age and growth of the silky shark Carcharhinus falciformis (Muller & Henle, 1839) in the Ecuadorian Pacific

Christopher Mera https://orcid.org/0009-0008-1944-4644 A * , Diego Mejía B , Smith Vera-Mera A , Steven Tamayo-Vega A , Felipe Galván-Magaña B , Michael Veléz-Soledispa A and Jesús Briones-Mendoza https://orcid.org/0000-0001-6805-7706 A
+ Author Affiliations
- Author Affiliations

A Facultad Ciencias de la Vida y Tecnologías, Universidad Laica ‘Eloy Alfaro’ de Manabí, Ciudadela Universitaria vía San Mateo, 130802, Manta, Manabí, Ecuador.

B Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Ave. IPN s/n, Colonia Playa Palo de Santa Rita, 23096, La Paz, Baja California Sur, Mexico.

* Correspondence to: Chriistopherjavier17@hotmail.com

Handling Editor: Karissa Lear

Pacific Conservation Biology 31, PC24090 https://doi.org/10.1071/PC24090
Submitted: 27 November 2024  Accepted: 26 March 2025  Published: 11 April 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Carcharhinus falciformis (silky shark) ranks third in elasmobranch landings in the Ecuadorian Pacific. However, there is limited and outdated information about its life history, making it challenging to propose management strategies.

Aims

To determine the age and growth parameters of C. falciformis in the southern Ecuadorian Pacific.

Methods

At the artisanal port ‘Playita Mía’, vertebral samples were collected from 290 specimens (161 females and 129 males) and sectioned sagittally to estimate age. A Bayesian and frequentist multimodel approach (von Bertalanffy, Gompertz, and Logistic) was used for length-at-age analysis.

Results

Sizes ranged from 79.2 cm to 238 cm total length (TL), with age groups estimated between 0 and 19 years. The Bayesian von Bertalanffy growth model provided the best fit according to the leave-one-out information criterion (LOOIC). The estimates were: (1) for combined sexes, L∞ = 271.54 cm TL, k = 0.09 years−1, and L0 = 72.21 cm TL; (2) for females, L∞ = 271.83 cm TL, k = 0.09 years−1, and L0 = 71.61 cm TL; and (3) for males, L∞ = 273.60 cm TL, k = 0.08 years−1, and L0 = 72.99 cm TL.

Conclusions

This study demonstrates that C. falciformis is a slow-growing species, making it susceptible to overfishing.

Implications

The findings provide valuable information for future population and demographic analyses of this species.

Keywords: age and growth, Bayesian method, Carcharhinus falciformis, Ecuador, elasmobranch, fisheries, frequentist method, multimodel growth.

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