Small fish and shrimp as well as squid, octopus, and other cephalopods are steadily declining. Humpback dolphins are being forced to search further and further for food, thus expending more energy in the process. This lowers their survival rate.
此外，漁業過度捕撈，使白海豚愛吃的小型魚、蝦及烏賊不斷減少，白海豚被迫擴大覓食範圍、耗費更多體力找尋食物，存活率因而降低。