I somehow got the feeling that the author is trying to discourage aquaculture
Look at the statement "Aquaculture production of ornamental species should be avoided when it would replace a harvest of wild animals that maintains habitat, a cultural benefit, or an economic benefit"
How can harvesting of wild animals maintain habitat?
"Thus, public opposition will not be as great since there is no direct impact on the marine environment"
Yeah right, all of us know that wild collections are already damaging the reefs