If any captain or master of a vessel, or any person, shall obstruct, or cause to be obstructed, any navigable bay, river, creek, or other navigable channel or pass thereof, in any manner whatever, or shall discharge any ballast in any harbor or place other than that designated by the harbor commissioners therefor, on conviction thereof, the offender shall be fined not more than one thousand dollars, or imprisoned not longer than six months, or both.