Ridding pond of java moss

[efface]

Some how I got java moss in my pond this year and it has been a real chore removing it. I have tons of plants so I can't poison the water. No fish.

I am wondering if a possible solution is to put black plastic down over all the water while keeping the plants out of. I assume enough time of this would kill everything in there but I am not sure if spores would still be able to grow after removing the covering.

Any thoughts?

Included a shot of my water feature for your viewing pleasure.