Age, Growth, Reproduction, Mortality of the Striped Sea bream Lithognathus mormyrus[Linnaeus, 1758] in the Syrian marine water

International Journal of Agriculture & Environmental Science

© 2020 by SSRG - IJAES Journal

Volume 7 Issue 1

Year of Publication : 2020

Authors : Dr: Wassem Ghanem

10.14445/23942568/IJAES-V7I1P105

How to Cite?

Dr: Wassem Ghanem, "Age, Growth, Reproduction, Mortality of the Striped Sea bream Lithognathus mormyrus[Linnaeus, 1758] in the Syrian marine water," SSRG International Journal of Agriculture & Environmental Science, vol. 7,  no. 1, pp. 24-29, 2020. Crossref, https://doi.org/10.14445/23942568/IJAES-V7I1P105

Abstract:

The results of the study the age, growth, length-weight relationship, reproduction and mortality of Lithognathus mormyrus [Linnaeus,1758] caught from four regions of Syrian marine water were analysed during 2018. Number of studied specimens reached to [133] individuals, the total length ranged between [13.4-29.4] cm, and the total weight ranged [22.57-352.41] g. The length- weight relationship presented that there are no clear different between the longitudinal and weight variables for female and male [a=0.011, b=3.097, R2 =0.64] for females, and [a=0.311, b= 2.72, R2= 0.88] for males. Six different age groups were reported among the studied individuals [I+,II+,III+,IV+,V+,VI+,VII] the age group III+ formed the largest percentage 30.09%, and lowest percentage VII+ is0.75 %. Sexual maturity at 2 years and total length 11.5 cm, also the reproduction period extends from May to September, with the sexual maturity coefficient [RGS=5.31]. The growth rates according to Von Bertalanffy equation was found that [L∞=37.42 Cm, K= 0.16] for female, and [L∞=32.34Cm, K= 0.19], and the maximum age [17.64] year for female, and 15 year, for male. Thus, this study was found that Lithognathus mormyrus suffers from overfishing, as mortality rates were high among male and female of this specie.

Keywords:

Lithognathus mormyrus, age, growth, mortality, Syrian marine water.

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