Lionfish: Is it morally justifiable to kill in the name of conservation?

What are the moral and ethical implications of killing wildlife in the name of conservation? A September 12 article in Nature (Hoag 2014) discusses efforts to control lionfish populations on American coral reefs. This invasive species certainly poses a problem for resource managers, since its voracious appetite can lead to depletion of native fish. As the article discusses, hunting competitions have proven effective at damping down lionfish populations, although not at eliminating the threat.

Killing charismatic animals

For some, the taking of any life is the antithesis of conservation. When a rhino was auctioned off for a planned hunt, a furore erupted even though the auction raised $350,000 for conservation (Howard 2014). In February, many were incensed at reports of the killing of a young giraffe at Copenhagen Zoo (and subsequent feeding of the body to resident lions), explained by the zoo as necessary to prevent inbreeding in captive populations (Eriksen 2014).

Morality of killing for conservation

But there’s no similar outrage for competitions that incentivize the hunting of lionfish. From this response (or lack of it), it would appear to not be ethically questionable to kill an invasive species, and particularly to control an animal problem in which humans had a hand initially. (Genetic analysis has traced the origin of the lionfish invasion to accidental or intentional release of a dozen or fewer individuals on the Florida coast.) So is killing of any animals morally reprehensible, as some would have it, or is the higher purpose of trying to right a wrong taking the moral high road?

References

Hoag, H (2014) An affordable price tag for saving Brazil’s Atlantic rainforest. Nature 513, 294–295 (15 September 2014) doi:10.1038/513294a
http://www.nature.com/news/invasive-species-control-bounty-hunters-1.15916

Howard, B C (2014) Rhino Hunt Auction Stirs More Controversy. National Geographic News, January 13, 2014
http://news.nationalgeographic.com/news/2014/01/140113-dallas-safari-club-rhino-permit-auction/

Eriksen, L (2014) Copenhagen zoo sparks outrage by killing healthy giraffe named Marius. Guardian, February 9, 2014
http://www.theguardian.com/world/2014/feb/09/danish-zoo-outrage-giraffe-marius