Sarah Zhang explains:

Those familiar with the artificial lives of farmed cows or chickens would not be shocked to learn that farmed fish live similarly unnatural ones. Instead of their natural diet of zooplankton, which is difficult to domesticate, juvenile bass are fed rotifers and artemia. Adult fish are given feed made of ground up wild fish. The most crucial step in domesticating fish is controlling their reproductive cycle, which is done by implanting a microscopic polymer-based sphere that slowly releases hormone into the fish’s bloodstream.

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