Age precision and growth rate of Rhabdosargus haffara (Forsskål, 1775) from Hurghada fishing area, Red Sea, Egypt
|Author(s)||Osman Yassein A. A.1, Mehanna Sahar F1, El-Mahdy Samia M1, Mohammad Ashraf S1, Mahe Kelig2|
|Affiliation(s)||1 : National Institute of Oceanography and Fisheries, Egypt
2 : Ifremer, Fisheries Laboratory, Sclerochronology Centre, Boulogne-sur-Mer, France
|Source||Egyptian Journal of Aquatic Biology and Fisheries (1110 – 6131) (The Egyptian Society for the Development of Fisheries and Human Health), 2020 , Vol. 24 , N. 2 , P. 341 – 35|
|Keyword(s)||Age precision, growth, Rhabdosargus haffara, Hurghada, Red Sea, Egypt stock assessment|
The age and growth of the haffara seabream, Rhabdosargus haffara (Forsskål, 1775) from Hurghada fishing area, Red sea, Egypt, were investigated using a sample of 466 specimens. The fish length varied between 12.7 and 27.2 cm and the weight from 38.1 to 293.2 g. Samples were collected from the artisanal fisheries during the fishing season from August 2018 to July 2019. The relationship between the body lengths (total, fork and standard length in cm) and the body weight (g) was found to be significant (p < 0.05). The relationship between the body length and weight regarding the sex effect was insignificant for all samples (log W- log TL, ANCOVA, p > 0.05). The relationship between length and weight was estimated by a power regression function, with a scaling factor at a = 0.0106 for both females and males and 0.0107 for the combined sexes, the exponent b = 3.13, 3.13 and 3.129 for females, males and for all samples, respectively. Age was determined using the whole otolith and the maximum age of haffara was 5 years old for females and males. The otolith readings indicated good agreement between the two readers with an agreement = 88.35%, CV = 3.93% and APE = 2.78%. The von Bertalanffy growth parameters were estimated at TL∞ = 30.13 cm, k = 0.35 y–1, and t0 = –0.24 y for females, TL∞ = 30.49 cm, k = 0.36 y–1, and t0 = –0.26 y for males, TL∞ = 30,47 cm, k = 0.36 y–1, and t0 = –0.26 y for the combined sexes.