It shall be unlawful to use any kind of firearm to kill or injure mink or otter or to possess or sell any mink or otter, or the pelt thereof, which was killed by any kind of firearm, provided that nothing in this Code section shall prevent a person from dispatching a mink or otter found in a trap or from killing any mink or otter while it is destroying or damaging, or about to destroy or damage, the person's crops, domestic fowl, or other personal property.