It is prohibited to throw or cause to be thrown or deposited into any waters of the United States Virgin Islands, oils, acids, poisons or any other substance which destroys or injures fish as defined herein. When any natural or artificial person desires to discharge into any waters of the United States Virgin Islands, whether pond, lagoon, spring, stream, river, channel, sea or other waters, the residue or waste of any factory or industrial enterprise, he shall first obtain all necessary federal and United States Virgin Islands permits. Any artificial person violating the provisions of this section is guilty of a misdemeanor and shall upon conviction therefor, be fined not less than three hundred ($300) dollars nor more than five hundred ($500) dollars on each count. Any natural person violating the provisions of this section is guilty of a misdemeanor and shall, upon conviction therefor, be punished by a fine of not less than three hundred ($300) dollars nor more than five hundred ($500) dollars on each count or be imprisoned for not more than six (6) months, or by both such fine and imprisonment. The provisions of this section shall not be construed to prevent the Department of Health from throwing into the water any substance necessary for the protection of the public health.