It shall be a misdemeanor, punishable by a fine of not more than one hundred dollars ($100), for any person to refuse to move or stop on oral command or order of any employee of the department of environmental management in the exercise of the employee’s duties under this chapter. It shall likewise be a misdemeanor, punishable as aforesaid, for any person to refuse to move or stop on oral command of a harbormaster, assistant harbormaster, or police officer, operating from a patrol boat identified as such and exercising the duties lawfully assigned to him or her.