Whales and tuna fishermen are the predators for dolphins. The dolphins follow schools of tuna so the large tuna boats look for tuna by looking for dolphins. They set huge nets to catch the tuna, but the dolphins get caught up in the nets and because they are mammals they drown in the net. Many tuna companies say they don't do this anymore, but that isn't necessarily true. You can see video on this if you want to see what happen to the dolphins.
sharks
I am the dolphin's predator
Humans can be predators of any species. If you kill the dolphin you are a predator
killer whale
They have incredible speed so to confuse the predators they jump in the air.
Sharks, killer whales and man.
sharks and squids and octopus
killer whales and sharks
Dolphins are top/apex predators.
Spinner dolphins have many different predators that will eat them. These predators of the spinner dolphin include killer whales, pygmy killer whales, pilot whales, and sharks.
The size of a dolphin compared to a shark is more than half and dolphins aren't predators. If you compare more factors, a dolphin could never win
Killer whales are one of the most common predators of dolphins. However, sharks are also predator of the dolphin.