There are quite a few non-toxic anti foulings on the market now. Keep in mind that these products do not perform as well as traditional, copper-laden paints and require much more frequent cleanings, at least in a true marine environment
. And failure to keep these coatings very clean can result in the failure of the coating, in some cases. While I absolutely advocate the development and use of non-toxic anti foulings, they have not yet reached the point where they work
particularly well or are cost-effective, IMHO.