i have a big fish pond and have 3 water lilies and the leafs are been eaten thought by the orfe`s but after a bit i looked at the leafs and there is a small clear ish lava about the size of a mige lava eating the leafs have done all the test on the water and it is fine i do get lots of flys around the water and it takes about 2 weeks for the lava to eat a lile leaf do not get me wrong it is not like the leafs are been eating so there is no leafs on the lile just incase i need to put some thing in the water and i have sturgeon as well so i would have to watch wot i put in water if i need to do that hope u can help

I'm sorry about your lilies. I have a page on plant pests at http://www.fishpondinfo.com/plants/plantpests.htm

They may be leaf-mining midges which obviously look like midges and make little trails in the leafs. The waterlily leaf beetles will make little o's in the leaves.

My water lilies get eaten by these animals - aphids, leaf-mining midges, deer, raccoons (who really tear and not eat), snails, goldfish, koi, and probably more. The goldfish and koi don't do much damage in comparison to the others. Orfe rarely eat vegetation; they mostly eat bugs.

Bt bacteria may kill the leaf-mining midges (as well as other flies and midges in the pond though). In the US, it's sold in mosquito dunks and bits and Bt liquid. It's probably in the UK too. Bt is safe for your fish. It only kills mosquito larvae, certain fly and midge larvae, caterpillars, and a few other insects.