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In this study, two samples of Irrawaddy dolphins (Orcaella brevirostris Gray, 1866) in Kien Giang waters, Vietnam were collected. The phylogenetic tree showed that Irrawaddy dolphins in Vietnam had a close genetic relationship to Irrawaddy dolphins in Indonesia and Laos which have been registered in the Gene Bank. This is the latest research in Vietnam about determining the mitochondrial cytochrome b gene sequence and the hereditary relationship of Irrawaddy dolphin (Orcaella brevirostris Gray, 1866) in Kien Giang waters. This results contributed to the conservative research and development of this valuable and rare marine mammal species.

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In this document, we focus on the results of the 10 years Vietnam - Russia Tropical Center’s study on some biological characteristics of Irrawaddy dolphins (Orcaella brevirostris) which are in the IUCN Red List of threatened species in Vietnam. Several biological characteristics such as: shape, size, weight and anatomical features… of Irrawaddy dolphins (Orcaella brevirostris) in Ba Lua Islands, Kien Giang are defined. These are the first research results obtained in Vietnam for the purposes of the species conservation and development.