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Age, growth, longevity, natural mortality and maturity of the longnose spurdog, Squalus blainvillei (Chondrichthyes: Squalidae), in the Gulf of Gabes (Central Mediterranean Sea)

Abstract : Age, growth, longevity, natural mortality and size and age at maturity of the longnose spurdog, Squalus blainvillei, in the Gulf of Gabes (Tunisia, Central Mediterranean Sea) are reported. Marginal increment suggested annual band formation. Age estimates ranged from 3 to 15 and 4 to 19 years for males and females, respectively. Von Bertalanffy growth parameters derived from length at age data were: L-infinity = 105.7 cm, K = 0.11year(-1), t(0) = -1.12 year for females and L-infinity = 91.1 cm, K = 0.14 year(-1), t(0) = -1.42 year for males. Males and females reached maturity at 52.3 cm and 62.5 cm TL corresponding to 4.97 and 7.44 years, respectively. Longevity estimates were 24.75 and 31.50 years for males and females, respectively. Based on life history parameters, natural mortality estimation M ranged from 0.16 to 0.33.
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Submitted on : Thursday, December 20, 2012 - 10:41:35 AM
Last modification on : Tuesday, June 23, 2020 - 12:30:05 PM

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Soundes Marouani, Hasna Kadri, H. Saidi, B. Morize, Abderrahmen Bouain, et al.. Age, growth, longevity, natural mortality and maturity of the longnose spurdog, Squalus blainvillei (Chondrichthyes: Squalidae), in the Gulf of Gabes (Central Mediterranean Sea). Cahiers de Biologie Marine, Station Biologique, 2012, 53 (2), pp.197-204. ⟨10.21411/CBM.A.E6C632F8⟩. ⟨hal-00767619⟩

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