Construction of the new airport at Chep Lap Kok and the North Lantau Expressway have destroyed natural coast and marine habitat. More dolphin habitat had disappear when container terminals are built at Yam O and Lung Kwu Tan, both areas frequented by the dolphins. Contaminated mud from just north of the new airport platform.
Sewage includes household toxic wastes such as cleaning fluids, bacteria, and viruses that can affect the dolphins directly, and industrial effluent.
Hong Kong's increasingly sophisticated and virtually unregulated fishing fleet is depleting the dolphins' food supply. Hong Kong's fish catch peaked in 1989. Several dead dolphins have show signs of having been caught and/or tangled in fishing nets.
While dolphins are usually adept at sensing and staying out of the way of boats, some show signs of collisions.
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