ĐẶC ĐIỂM HÌNH THÁI NGOÀI VÀ PHÂN BỐ CỦA CÁC LOÀI ỐC NƯỚC NGỌT Ở ĐẢO BẠCH LONG VĨ

This study was conducted to determine the species composition, external morphological characteristics, and distribution of freshwater snails on Bach Long Vi Island. A total of 254 snail specimens were collected from freshwater habitats across the island in September 2024. Seven species of freshwater snails were identified, belonging to six genera, six families, and two subclasses, including three exotic species (Pomacea canaliculata, P. maculata, Physella acuta) and four native species (Melanoides tuberculata, Angulyagra boettgeri, Orientogalba viridis, Gyraulus convexiusculus). This is the first checklist of freshwater snails from Bach Long Vi Island. None of the recorded species are listed in the 2024 Vietnam Red Data Book as endangered, rare, or threatened. The study provides scientific data on the taxonomy, distribution, and ecological characteristics of freshwater snails on the island, and proposes preliminary management measures to help control and mitigate the impacts of invasive species.