Population biology of an endangered species: the common guitarfish Rhinobatos rhinobatos in Lebanese marine waters of the eastern Mediterranean Sea

Autor: Lteif, M., Mouawad, R., Khalaf, G., Lenfant, P., Verdoit-Jarraya, M.
Přispěvatelé: Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), National Center for Marine Sciences [Lebanon], National Council for Scientific Research = Conseil national de la recherche scientifique du Liban [Lebanon] (CNRS-L), Water and Environment Laboratory, Faculty of Sciences and Computer Engineering Department of Chemistry and Life Sciences, Holy-Spirit University of Kaslik [Jounieh]
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Journal of Fish Biology
Journal of Fish Biology, Wiley, 2016, 88 (4), pp.Pages 1441-1459 ⟨10.1111/jfb.12921⟩
ISSN: 0022-1112
1095-8649
Popis: International audience; This study focuses on the population biology of the common guitarfish Rhinobatos rhinobatos, a cartilaginousfish listed as Endangered in the International Union for the Conservation of Nature (IUCN)Red List. Between December 2012 and January 2014, 67 individuals were collected by bottom longliningin coastal Lebanese marine waters at different ports at depths ranging from 10 to 110 m. The totallength (LT) of the specimens ranged from 50 to 143 cm, and the mean±s.d. was 76⋅2±19⋅7 cm. Themost common LT classes were between 60 and 70 cm. The total mass of the specimens ranged from410 to 10 000 g, and the mean±s.d. was 1841±1987 g. A total of 34 males and 33 females werecollected, and the sex ratio was not significantly different from 1:1. The mass and LT relationshipshowed positive allometric growth (b=3⋅096 and r2 =0⋅99), and the mean±s.d. LT at which 50% ofthe individuals were sexually mature was 84⋅73±5⋅81 cm for females and 78⋅57±4⋅88 cm for males.The gonado-somatic and hepato-somatic indices were determined along with a condition factor, andparturition appeared to occur in winter. The primary prey items found in the fish stomachs during theautumn and winter seasons were Penaeidae. The results of this study will help to parameterize modelsof the population dynamics for this exploited fish stock to ensure the long-term sustainability of itsfishery.
Databáze: OpenAIRE
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