When the Milwaukee River Lake Sturgeon Reintroduction Project began 16 years ago, success wasn’t immediately apparent.
Having a solid scientific foundation for the project wasn’t the problem: sturgeon were raised in the Milwaukee River so they would return there to spawn when the time came. The problem was that lake sturgeon don’t return to a river to spawn for around 15 years.
Great Lakes Now
https://www.greatlakesnow.org/2021/07/ways-see-touch-appreciate-sturgeon-great-lakes-region/