What If fish populations in the Antarctic were to decline what would be the best way for the smaller toothed whales to adapt?

If fish populations in the Antarctic were to decline, smaller toothed whales could adapt by shifting their diet to include alternative prey, such as squid or krill, which may still be abundant. They might also alter their foraging strategies, utilizing different hunting techniques or exploring new feeding grounds. Additionally, these whales could adjust their social structures and migratory patterns to optimize foraging opportunities in response to changing prey availability.