there are several facts that result in the decreasing number of ets population of humpback dolphins. first, large-scale modification of the shoreline by industrial development including hydraulic filling for creating industrial or science parks, seawall construction and sand mining cause habitat fragmentation and diminish dolphin's habitats. in addition, exploitation of shoreline also contributes to toxic contamination flows into dolphin's habitats. the chemical pollution from industrial or agricultural and municipal discharge results in impaired health of dolphins, for instance, reproductive disorders, and compromised immune system.