Tuyển tập các báo cáo nghiên cứu khoa học của trường đại học cần thơ trên tạp chí nghiên cứu khoa học đề tài: KHẢO SÁT SỰ TỒN TẠI CỦA CÁ HEO NƯỚC NGỌT (Orcaella brevirostris) Ở LƯU VỰC SÔNG MÊKÔNG CỦA VIỆT NAM. | Tạp chí Nghiên cứu Khoa học 2006 291-300 Trường Đại học Cần Thơ KHẢO SÁT SỰ TỒN TẠI CỦA CÁ HEO NƯỚC NGỌ T Orcaella brevirostris Ở LƯU VỰC SÔNG MÊKÔnG CỦA VIỆT nAm Isabel Beasley1 Lê Xuân Sinh2 Amanda Hodgson1 ABSTRACT This study was undertaken by the researchers of James Cook University Australia and Cantho University Vietnam in collaboration with the Vietnamese Department of Fisheries. Surveys were carried out throughout the Vietnamese Mekong River from 5-13 May 2005 covering a total of km of boat survey in hours. Interviews using the questionnaires were conducted with 84 elderly people and fishermen alongsides of Tien and Hau rivers. A total of 3 062 boats were observed averaging 7 boats km. The most numerous boats were cargo 43 fishing boats and long-tail 15 . There are very high levels of boat traffic and fishing activities throughout the upper Vietnamese River system. River dolphins were reportedly regularly sighted by local villagers before the 1970s. During the surveys no dolphins were sighted one whale skeleton and one photograph of a dead Irrawaddy dolphin were observed. It appears that Mekong River Irrawaddy dolphins are now locally extinct from the Vietnamese Mekong. The main causes of decline of Irrawaddy dolphins in the Vietnamese Mekong River were recorded as 1 accidental catch in gillnets 2 over-fishing 3 being shot or bombed 4 directly caught in seine nets by Muslims 5 electric fishing and 6 siltation and pollution of critical habitats. Local people have a very favorable attitude towards conserving natural aquatic resources including Irrawaddy dolphins in Vietnamese Mekong due to their benefits. The frequent reports of Irrawaddy dolphins around Hau estuary representing a resident population that needs to be given further studies. Keywords River Irrawaddy dolphins Mekong river Vietnam Title Investigating the occurrence of Mekong Irrawaddy dolphins Orcaella brevirostris in Vietnam tóm tắt Nghiên cứu này được thực hiện bởi các thành .
