Ranim Othman* (1), Mohamad Galiya(1), and Zohair Almajed (1)
(1). Faculty of Science, Tishreen University, Lattakia, Syria.
(*Corresponding author: Ranim Othman. E-Mail: ranim.mr.othman@gmail.com).
Received: 24/09/ 2021 Acceptance: 9/11/ 2021
Abstract:
The research aims to study the reproductive biology(Sex Determination, Sexual Maturity, Fertility, Reproductive period) of the Trachurus trachurus fish caught from the Syrian marine water using local fishing methods ( gill nets, purse seines), and their total number is 401 individuals. The results of the research showed that the total fertility of mature females of the Trachurus trachurus fish amounted to 110208/ eggs in the Ras Albasit area and 94535/ eggs in the Burj Islam area, with lengths ranging from 16.2 – 22.2 cm. The results of the study of changes in the values of the Sexual maturity coefficient (GSA%) indicated that the sexual cycle lasts for a whole year, but the laying of eggs occurred in the form of batches. The peak value of the maturity coefficient was reached in the regions of Ras Al basit and Burj Islam during the month of May, and females lay their eggs for the first time when average lengths of 16.4 cm. The statistical study also showed that there were significant differences (p > 0,05) in the mean values of the liver weight index (HSI%) between females and males in both study areas.
Keywords: Reproductive biology, Fertility, Trachurus trachurus, Syrian marine water.
Full paper in Arabic: pdf