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Age, growth and reproduction of Raja miraletus (Linnaeus, 1758) (Chondrichthyes: Rajidae) of the Gulf of Gabès (Tunisia, Central Mediterranean Sea)
Kadri, H.; Marouani, S.; Saïdi, B.; Bradai, M.N.; Ghorbel, M.; Bouaïn, A.; Morize, E. (2012). Age, growth and reproduction of Raja miraletus (Linnaeus, 1758) (Chondrichthyes: Rajidae) of the Gulf of Gabès (Tunisia, Central Mediterranean Sea). Mar. Biol. Res. 8(4): 388-396. dx.doi.org/10.1080/17451000.2011.619546
In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000, more
Peer reviewed article  

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Keywords
    Age; Growth; Longevity; Maturation; Mortality; Raja miraletus Linnaeus, 1758 [WoRMS]; MED, Mediterranean [Marine Regions]; MED, Tunisia, Gabes Gulf [Marine Regions]; Marine

Authors  Top 
  • Kadri, H.
  • Marouani, S.
  • Saïdi, B.
  • Bradai, M.N.
  • Ghorbel, M.
  • Bouaïn, A.
  • Morize, E.

Abstract
    Age and growth of the brown ray, Raja miraletus, was estimated from ring counts on vertebral sections from 95 females (13.5–56.0 cm total length (TL)) and 85 males (13.5–58.0 cm TL) collected from the Gulf of Gabès (Central Mediterranean, Tunisia) during 2007. Marginal increment and edge analyses suggest annual band pair formation. The oldest female and male brown rays were 9 and 7 years old, respectively. Von Bertalanffy growth parameters are L8 = 69.20 cm TL, k=0.18 year–1 and t 0=–0.11 years for females, and L8 = 67 cm TL, k=0.22 year–1 and t 0=–1.01 years for males. Longevity estimates were 19.25 and 15.75 years for females and males, respectively. Based on life history parameters, natural mortality estimation M was in the range 0.37–0.47 for females and 0.60–0.61 for males. Males were found to mature between 28 and 43 cm TL and L50% was estimated at 34.31 cm TL (21.91 cm DW). Females mature between 33 and 48 cm TL and reached L50% at 41.8 cm (27.10 cm DW). Age at sexual maturity (A50%) was estimated at 2.7 years for males and 4.41 years for females. Females and males have an annual reproductive cycle. Mating occurred mostly through spring and summer.

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