The Mekong Delta — where Southeast Asia's great river fractures into hundreds of distributaries before meeting the South China Sea — supports extraordinary freshwater biodiversity and tens of millions of people. Dam construction upstream has fundamentally altered the river's pulse, devastating wildlife welfare.
Conservation teams monitor individual dolphins by dorsal fin markings. When entangled animals are found, disentanglement attempts require boat approaches that cause stress. Post-entanglement monitoring documents injuries and survival. Community-based fishery protection zones around remaining dolphin habitat are the primary welfare intervention.
Over 140 dams have been built or are planned on the Mekong mainstream and tributaries. Welfare impacts:
The giant freshwater stingray (Urogymnus polylepis) — reaching 600kg and 4m — was confirmed as the world's largest freshwater fish in 2022 when a 300kg female was caught in Cambodia. These animals are Critically Endangered. Each incidental catch in fishing gear potentially kills an irreplaceable individual. Community-based catch-and-release programs with researcher partnership have been established.
The Mekong Delta is the center of Vietnam's intensive catfish (pangasius) aquaculture — producing 1+ million tonnes annually. Welfare conditions in pangasius ponds: extremely high densities (50-80kg/m³), frequent feed-induced water quality deterioration, antibiotic overuse causing gut microbiome disruption, and stressful harvest methods (pump drainage and crowding). Certification programs (ASC, GlobalG.A.P.) are gradually improving welfare standards in export-oriented operations.
The delta's wetlands support millions of waterbirds. Drainage for rice agriculture has reduced wetland area by 60%+ since 1975. Surviving birds face: pesticide exposure (organophosphates, rodenticides used in rice farming), hunting pressure, and loss of roosting habitat. Painted storks, open-billed storks, and ibis that breed in remaining delta forests are sensitive to human disturbance.