The study of biological, density and sex ratio of snails Neritina violacea, (Gmelin, 1791) in Shatt Al-Aarb, Basrah, Iraq
Abstract
Intisar Mohammed Ali Jabbar*, Mohammed Faris Abbas and Ibtsam Mahdi Abdul-Sahib
Between October 2021 to September 2022, snail samples, specifically Neritina violacea, were collect seasonally from two selected sites in the Shatt al-Arab. At the first station, Garmat Ali and the second station, Salhiya, environmental factors such as temperature, salinity, pH and dissolved oxygen levels in the water The measurements were taken.
This study analyzes the population structure of Neritina violacea snails in the intertidal zone of the Shatt al-Arab River, focusing on density, sex ratio, length and body weight. The snail density was 67.7 and 71.6 individuals per square meter, with a sex ratio ranging from 0.47:1 to 0.616:1 (female: male) and an average length of 20.91 mm. Canonical correlation analysis indicated a positive correlation between snail density and dissolved oxygen, while an inverse correlation was found with salinity, temperature and pH values at both study sites.