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Artículo

A comprehensive study of the life history traits of Trematomus newnesi (Pisces, Notothenioidei) off the South Shetland Islands

Novillo Estofan, Julio ManuelIcon ; Moreira, María EugeniaIcon ; Elisio, MarianoIcon ; Macchi, Gustavo JavierIcon ; Barrera Oro, EstebanIcon ; la Mesa, Mario
Fecha de publicación: 01/2025
Editorial: Academic Press Ltd - Elsevier Science Ltd
Revista: Estuarine, Coastal and Shelf Science
ISSN: 0272-7714
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ecología

Resumen

Understanding the life history traits of Antarctic fish species is crucial for effective management and conservation purposes. This study provides a comprehensive evaluation of the reproductive dynamics, age and growth characteristics in Trematomus newnesi, a common nototheniid species in the High-Antarctic zone. Field observations conducted in Potter Cove, South Shetland Islands, revealed significant variations in photoperiod and water temperature from November to March, with water temperatures reaching a peak in mid-December. The gonadosomatic index, as a proxy of gonad development, increased exponentially in both sexes from November to March. Sex steroid plasma levels, particularly testosterone (T) and estradiol (E2), showed significant temporalvariations, with a significant increase in the period when late vitellogenesis was evident, suggesting the proximity of final maturation and spawning. Age estimation through otolith readings provided a range of ages up to five years for both sexes. Comparison with previous studies on T. newnesi from other Antarctic areas highlighted similarities in reproductive patterns and differences in growth parameters. Photoperiod and an increase in temperature resulted to be trigger factors promoting vitellogenesis in T. newnesi, ending in an early austral autumn spawning event. The environmental cues and reproductive data recorded at Potter Cove suggest that this area serves as a spawning ground for T. newnesi. Likewise, larval hatching was estimated to occur from early tomid-August, after an egg incubation period of four months. Overall, this study provides insights into the life history traits of T. newnesi, as a valuable contribution for appropriate management and conservation of Antarctic fish populations.
Palabras clave: Nototheniids , Reproductive Physiology , Antarctic
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/265857
URL: https://linkinghub.elsevier.com/retrieve/pii/S0272771424004281
DOI: https://doi.org/10.1016/j.ecss.2024.109040
Colecciones
Articulos(IDEA)
Articulos de INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Articulos(IIMYC)
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Articulos(INBIOTEC)
Articulos de INSTITUTO DE INV. EN BIODIVERSIDAD Y BIOTECNOLOGIA
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Novillo Estofan, Julio Manuel; Moreira, María Eugenia; Elisio, Mariano; Macchi, Gustavo Javier; Barrera Oro, Esteban; et al.; A comprehensive study of the life history traits of Trematomus newnesi (Pisces, Notothenioidei) off the South Shetland Islands; Academic Press Ltd - Elsevier Science Ltd; Estuarine, Coastal and Shelf Science; 312; 1-2025; 1-12
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