Could a fish survive being swallowed by a baleen whale?

Yes, a fish could potentially survive being swallowed by a baleen whale, depending on the circumstances. Baleen whales filter feed by taking in large amounts of water and then expelling it through their baleen plates, trapping small organisms like krill and fish. If a fish were to be caught in this process, it might escape unharmed as the whale expels the water. However, if swallowed whole, the chances of survival would be extremely low due to the whale's digestive process.