The primary assessment on the dugong population in Viet Nam

Abstract

The biggest dugong reaches to 3m in length and weighs more than 500 kilograms. Dugongs swim in the shallow coastal waters of southern part, which have protected them from large waves and storms. Dugongs float up only to breathe, and never come on to land. There is still lack of information on the population status of dugong. The Research Institute for Marine Fisheries (RIMF) and other institutions estimated that there are approximately 25 to 100 dugong individuals still living in the Southern part of Viet Nam. However, 5-6 dugongs were incidentally died each year in Phu Quoc, Con Dao and Tho Chu Islands as well as their adjacent, where are the most important seagrass meadows in Vietnam Seawaters. Dugongs are considered as a protected species listed in "Red Data Book" of Viet Nam as well as listed by CITES under the highest at-risk category. They only live in or in the vicinity of plentiful seaweed and seagrass, which has been destroyed due to the pollution, dredging and farm soil being washed into the sea. Dugongs have the dramatic decline in their numbers. Serious threats include the environmental degradation, serious typhoons (Linda hurricane for example), which destroy their favor habitats, and the accidental catch of dugongs in fishing operations, especially by trawling with big mesh-size and open-mouth net. The results of this study add important information about this species to the sparse information currently available, and recommend further research required particularly for Vietnam and neighbouring countries. Additionally, exchanging information, experiences and constructive discussions on proper actions and cooperation in terms of the scientific research, coastal management and the responsible fishing operation will be positive direction towards a better future for the dugong population in Vietnam.