You can also mark the water plane as "Ecosystem friendly", it's one of the tiny buttons under the material preview in the upper right corner. The Ecosystem engine then will ignore the water plane when populating. You might want to keep the "decay near foreign objects" setting - so that your underwater plants won't grow through rocks or shipwrecks.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

My gallery   My freestuff