Movement and growth of the spotted gully shark Triakis megalopterus in South African waters
Rattachement africain : Afrique du Sud. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The movement and growth of spotted gully sharks Triakis megalopterus (family Triakidae) along the coast of South Africa were investigated using external dart tagging. Of a total of 7 211 sharks tagged, 657 (9.1%) were recaptured over a 37-year period, from 1984 to 2021. Average distance moved by recaptured sharks was 31 (SD 82) km, with a maximum distance moved of 911 km. The longest time at liberty was 6 332 days (17.3 years). Most recaptures (66.9%) displayed resident, philopatric behaviour, although adults moved significantly more than juveniles. There was strong seasonality in the catches, with more individuals caught during summer months (October–March); however, there was no evidence to suggest that adults undertook seasonal migrations to and from mating or pupping areas. Similarly, the findings suggested that pupping likely takes place throughout their distribution and is not confined to a particular region. Growth of recaptured individuals was slow, with an average growth rate of 50 mm year−1. This was similar to the growth rate determined by vertebral band counts but suggested that individuals could reach a theoretical maximum age of 41 years. Based on the species’ resident behaviour and slow growth rate, we advocate for maintenance of the current fishing regulations and greater protection in no-take marine protected areas with suitable habitat within their distribution. Further research using acoustic telemetry is also recommended.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Movement and growth of the spotted gully shark <i>Triakis megalopterus</i> in South African waters
- Date Crossref
- 02/04/2024
- Éditeur
- National Inquiry Services Center (NISC)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Rhodes University Department of Ichthyology and Fisheries Science Makhanda, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
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South African Association for Marine Biological Research Afrique du Sud (code pays fourni par la source)Institution
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South African Institute for Aquatic Biodiversity Makhanda, Afrique du Sud (code pays fourni par la source)Structure de recherche
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Nelson Mandela University Zoology Department and Institute for Coastal and Marine Research Gqeberha, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
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Oceanographic Research Institute (ORI) Durban, Afrique du Sud (pays nommé en fin d’affiliation)Structure de recherche
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Reel Science Coalition Cape Town, Afrique du Sud (pays nommé en fin d’affiliation)Institution
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Oceans and Coasts: Department of Forestry Cape Town, Afrique du Sud (pays nommé en fin d’affiliation)Institution
Department of Ichthyology and Fisheries Science — Rhodes University (Makhanda, Afrique du Sud), South African Association for Marine Biological Research (Afrique du Sud) et South African Institute for Aquatic Biodiversity (Makhanda, Afrique du Sud), avec 4 autres affiliations. Pays d’affiliation : Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.