The odd one out is herring. Whale, barracuda, and shark are all large predatory fish, while herring is a small schooling fish. Herring are typically about 12 inches long, while whales can grow to be over 100 feet long, barracuda can grow to be over 6 feet long, and sharks can grow to be over 40 feet long. Herring are also filter feeders, while whales, barracuda, and sharks are all carnivores. Herring eat plankton and small fish, while whales eat krill and small fish, barracuda eat fish, squid, and crustaceans, and sharks eat fish, squid, and other marine mammals.
Herring are an important part of the marine food web. They are a food source for many other animals, including whales, dolphins, seals, and seabirds. They are also a popular food for humans. Herring are caught commercially in many parts of the world. They are used to make fish oil, fishmeal, and canned fish.