Humpback whales feed on shrimp-like crustaceans (krill) and small fish, straining huge volumes of ocean water through their baleen plates, which act like a sieve.

Do humpbacks eat salmon?

As reported by Sciencenews.org, Humpback whales in Southeast Alaska have been observed deliberately pursuing and eating freshly released hatchery raised salmon.

What do cetaceans eat?

All cetaceans are carnivores and do not consume plants or algae as food. The large baleen whales eat schooling organisms that range in length from minute drifting mollusks, copepods (1 cm or less), krill (1–5 cm), and small fish and squid up to about 40 cm.