How much krill do blue whales eat in one serving?

Your question is based on a misconception. Blue whales don't eat krill in individual "servings." They are known for their enormous appetites and can consume vast quantities of krill in one feeding session, but it's not accurate to refer to it as a "serving." Blue whales are filter feeders and engulf large amounts of water filled with krill, straining the water through baleen plates to extract the tiny crustaceans. Their daily consumption can vary depending on factors like the season, food availability, and the whale's size and energy needs, but it's not measured in individual servings.