Any person or corporation violating any provision of this act shall be guilty of a misdemeanor and upon conviction shall be punished by a fine of not less than twenty-five dollars nor more than one thousand dollars, or by imprisonment in the county jail for not more than six months or by both such fine and imprisonment; and for purposes of prosecution it shall be prima facie proof that the river bed or island involved in such suit is the property of the state to show by the records of the county clerk and register of deeds that the same is not recorded as patented by the United States or by the state of Kansas or recorded as school land sold but not yet patented by the state of Kansas, or otherwise held by record title.