River dolphin species are among the most endangered cetaceans globally, facing welfare threats from pollution, fishing gear entanglement, boat strikes, and habitat modification.
River dolphin welfare illustrates how freshwater habitat degradation translates into individual animal suffering. Dolphins entangled in fishing nets experience the acute distress of drowning — a horrific death for mammals that surface regularly to breathe. Chronic boat noise impairs the echolocation that river dolphins — many of which are functionally blind due to turbid water — depend entirely upon for navigation and prey location, creating chronic sensory disruption equivalent to being progressively blinded. Agricultural runoff containing pesticides and heavy metals bioaccumulates in dolphins at the top of aquatic food chains, causing immune dysfunction, reproductive failure, and mortality. The baiji extinction demonstrates the terminal outcome of neglecting river dolphin welfare and conservation — a unique evolutionary lineage permanently lost.