In the ocean the fish and mammals depend on their body size to survive. If they are too small for their species then they don't often live long enough to reproduce. Whales, for example, need extra blubber to survive the far northern or southern cold oceans. Their weight loss supplements are in the form of brine shrimp or large schools of small fish. Only the Killer Whales will feast on the larger prey animals like seals, dolphins, tuna and sharks.
It is not only sea mammals that need to have extra body mass but fish do too. A thin under weight fish usually has a health problem going on and lack of energy to escape from larger fish hunting it.
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