Abstract
This study aimed to detect the effect of temperature on wet weight, shell length and shell aperture of seawater snail Planaxis sulcatus and Nerita undata.This experimental study investigated 18 Planaxis sulcatus snails and 18 Nerita undata that were collected from the beach of Sharm Yanbu in western of Saudi Arabia. Samples were divided into 3 groups control, cure 1 and cure 2. Each group contained 6 snails. Group cure 1 was treated by increasing water temperature to be 28 degrees C, while group cure 2 was treated by increasing water temperature to be 33 degrees C.There were no significant differences in the weekly measures of the wet weight, shield length, and, shield aperture of Planaxis sulcatus between the studied groups, while there was a significant difference between control group and cure 1 group for the first and second weeks. There were no significant differences between weekly measures of the wet weight, shield length, and, shield aperture of Nerita undata between the three studied groups, while there was a significant difference between cure 1 group and both control group and cures 2 groups for the third week regarding shield aperture. Also, there was a significant difference between control group and cure 2 groups for the third week regarding wet weight.This study showed that there is no relationship between temperature elevation and the wet weight, shield length and shield aperture of Planaxis sulcatus and Nerita undata collected from the beach of Sharm Yanbu in western of Saudi Arabia.