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Resumen del producto

Mera, C., D., Mejía, S., Vera-Mera, S., Tamayo-Vega, F., Galván-Magaña, M., Vélez-Soledispa & J., Briones-Mendoza (2025). Age and growth of the silky shark Carcharhinus falciformis (Muller & Henle, 1839) in the Ecuadorian Pacific. Pacific Conservation Biology. 31(3): PC24090. DOI: 10.1071/PC24090.

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

Christopher Mera, Diego Mejía, Smith Vera-Mera, Steven Tamayo-Vega, Felipe Galván-Magaña 1, Michael Vélez-Soledispa y Jesús Briones-Mendoza

1 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas
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 However, there is limited and outdated information about its life history, making it challenging to propose management strategies.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, L8 = 271.54 cm TL, k = 0.09 years-1, and L0 = 72.21 cm TL; (2) for females, L8 = 271.83 cm TL, k = 0.09 years-1, and L0 = 71.61 cm TL; and (3) for males, L8 = 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.

Palabras clave: age and growth; Bayesian method; Carcharhinus falciformis; Ecuador; Elasmobranch; fisheries; frequentist method; multimodel growth

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