Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt

Dessouky, Gaber; El-Ganainy, Azza; Salem, Mohamed; El-Aiatt, Atya; Amany A. Mahmoud, Amany A. Mahmoud

doi:10.21608/jades.2016.63354

Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt

Document Type : Original Article

Authors

¹ Faculty of Environmental Agricultural Sciences, EL-Arish, Suez Canal Univ

² National Institute of Oceanography and Fisheries, Suez, Egypt

³ Faculty of Environmental Agricultural Sciences, EL-Arish, Suez Canal Univ., Egypt

10.21608/jades.2016.63354

Abstract

Age and growth of 599 thin-lipped grey mullet, Liza ramada from the Bardawil lagoon were estimated by ring counts on scalesduring April to December, 2013. Lengths (Lt) ranged between 11.6 to 45.8 cm and the corresponding weight (Wt)was 28 to 668 g. All fishes aged from 0 to 6 years, with age 1^st, 2^nd, 3^th year being the most dominant age groups. The length-weight relationship indicated negative allometric growth (b=2.764). Back– calculated lengths were16.9, 23.1, 28.3, 32, 35.5 and 38.3 cm to ages 1^st, 2^nd, 3^th, 4^th, 5^th and 6^th, respectively. Von-Bertalanffy growth parameters (VBGP) were L∞=50.95cm, K=0.1977yr^-1, t₀= -1.04yr^-1. The growth performance index (φ) was 2.71.The sex ratio of L. ramada in the present study was ≈ 1:2 male to female, respectively. The reproductive activity starts in September, while the highest values of GSI were at November and December. The length at first sexual maturity (L_m50) was estimated at 28.6 cm (≈ 3.1 years) and 29.6 cm (≈ 3.4 years) for males and females, respectively.

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