Abstract In the course of the survey of mollusk fauna associated with the Karaj River in Alborz province of Iran and the collections made in the period 2015-2016. the fauna of snails was investigated. Specimens were mainly collected and studied using conventional methods such as sampling nets and direct collection by hand from aquatic plants. rotten substrates. https://www.megavitamines.shop/product-category/shark-cartilage/