Dolphins are not frequent victims of any predator in the ocean due to their sociability and intelligence, but killer whales and some large sharks are their main natural threat.
Some dolphin species can eat up to 30 pounds of fish per day when adults. Their favorite prey and hunting techniques vary among species and habitats.
In some locations, fishermen are getting help from self-trained Bottlenose Dolphins
Bottlenose dolphins eat fish and squid like most of the popular dolphins eat.
There are 15 species of herring but the most common is the Atlantic Herring.