One species, distinct populations
Mahakam dolphins are the Orcaella brevirostris population living in the Mahakam River system. The species also occurs along Asian coasts and in other rivers. Mekong dolphin numbers or conditions cannot be used to describe the Mahakam population.
Part of a living river
Irrawaddy dolphins have rounded foreheads rather than the long beaks of many other dolphins. Fish are important food. Changes to fishing gear, traffic, or river conditions therefore need to be understood alongside the needs of people using the same waters.
Why wetlands matter to dolphins
RASI research connects changes in dolphin distribution with tributary conditions and fish spawning habitat, including peat-swamp areas. Protecting a single sighting location cannot capture the needs of the wider river system and the food supply it supports.
Individual identification differs from sighting totals
RASI uses repeated surveys and dorsal-fin photographs to identify individuals. The same dolphin may be seen many times. When reading a population estimate, check its year, coverage, and method; photographs or encounters do not equal distinct animals.
Observe without adding pressure
Choose activities that explain viewing rules and the role of local communities. Do not ask boat drivers to pursue or surround dolphins. To support research, ask about official reporting formats; timing and context are more useful than unverifiable counts.
Sources & references
References can change. Check dates and context in the original source.