Wis. Stat. § 29.717: Trespass on riparian land.

In an action against a person for damages sustained from trespassing on lands bordering streams stocked by the consent of the owner of the lands, with fish received from a state hatchery, where the damage exceeds $2, the trespasser is liable for double the amount of the damage and all of the taxable costs; and where the damage is $2 or less the trespasser shall be liable for the amount of the damage and costs not to exceed the amount of the damage.