Dessouky, G., El-Ganainy, A., Salem, M., El-Aiatt, A., Amany A. Mahmoud, A. (2016). Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt. Journal of Egyptian Academic Society for Environmental Development. D, Environmental Studies, 17(1), 25-36. doi: 10.21608/jades.2016.63354
Gaber Dessouky; Azza El-Ganainy; Mohamed Salem; Atya El-Aiatt; Amany A. Mahmoud Amany A. Mahmoud. "Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt". Journal of Egyptian Academic Society for Environmental Development. D, Environmental Studies, 17, 1, 2016, 25-36. doi: 10.21608/jades.2016.63354
Dessouky, G., El-Ganainy, A., Salem, M., El-Aiatt, A., Amany A. Mahmoud, A. (2016). 'Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt', Journal of Egyptian Academic Society for Environmental Development. D, Environmental Studies, 17(1), pp. 25-36. doi: 10.21608/jades.2016.63354
Dessouky, G., El-Ganainy, A., Salem, M., El-Aiatt, A., Amany A. Mahmoud, A. Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt. Journal of Egyptian Academic Society for Environmental Development. D, Environmental Studies, 2016; 17(1): 25-36. doi: 10.21608/jades.2016.63354
Age, growth and maturity of the thin-lipped grey mullet, liza ramada in Bardawil lagoon, North Sinai, Egypt
1Faculty of Environmental Agricultural Sciences, EL-Arish, Suez Canal Univ
2National Institute of Oceanography and Fisheries, Suez, Egypt
3Faculty of Environmental Agricultural Sciences, EL-Arish, Suez Canal Univ., Egypt
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 1st, 2nd, 3th 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 1st, 2nd, 3th, 4th, 5th and 6th, 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 (Lm50) was estimated at 28.6 cm (≈ 3.1 years) and 29.6 cm (≈ 3.4 years) for males and females, respectively.
View on SCiNiTO
Top