This page is all about Fish ! !
The Minnesota DNR keeps fish stocking information on their Lake Finder pages. They update the stocking information in the spring for the previous year. When you go to the site, look for the box labeled Fish Stocking Reports, enter the year you wish to see and enter Cass in the county field. You can get all species or just a selected one. Keep in mind that stocking is usually not done every year so you may need to look at several years to see when your lake was last stocked. Here is the link to the Lake Finder:
Here are links to the Walker and Brainerd Fisheries offices: