LANSING, Mich. (AP) — The state says it stocked Michigan waterways with more than 20 million fish this spring.

The Department of Natural Resources says more than 325 tons of fish went into the water at 732 stocking sites.

Ed Eisch, DNR fish production manager, says in a statement that it was “another outstanding spring stocking season that will bring significant benefits and fishing opportunities to Michigan.” The number and type of fish stocked vary by hatchery.

Fish are reared anywhere from a month to 1½ years before they are released. Some of the Chinook salmon and steelhead from the hatcheries are transferred to net pens for the final few weeks before they are released to get them acclimated.

Details about stocking by each hatchery are posted on the state’s website.