Because catching/keeping ocean predators is a lot safer than land predators. Imagine a farm where they keep wolves for a minute. Keeping them will be way harder and more dangerous than keeping cows. The wolves will definitely not be as easy to herd as a group of cows, and transporting them also takes a lot of risk. In the case of ocean predators, these risks aren’t there. All you need to catch/farm ocean predators are a ship and a good net.
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