The beluga whale is nicknamed the squid hound because of its diet and how it hunts its prey. They are opportunistic feeders; their feeding habits depend on their locations and the season. In general, the diets of these cetaceans consist mainly of fish; apart from those previously mentioned, other fish they feed on include capelin (Mallotus villosus), smelt, sole, flounder, herring, sculpin, and other types of salmon.
They also consume a great quantity of invertebrates, apart from shrimp, such as squid, crabs, clams, octopus, sea snails, bristle worms, and other deep-sea species. Animals in captivity eat 2.5% to 3.0% of their body weight per day, which equates to 18.2 to 27.2 kg.