Breeding grounds are a blocky circle that's a bit deformed, like half a amethyst geode. They would generate with sand and have some misty yellow water that's meant to be sand, get your mind out of the gutter. In this area some persistent salmon spawn, and start their journey. They have to swim 275 blocks away from the breeding ground and go back to breed automatically, but after that they lose persistence and give their persistence to their babies, and the cycle continues.
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