Lily damage from larvae

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Hi,
Here's what i've been finding on my lily leaves:
20220702_172505.jpg

20220702_172539.jpg

20220702_172639.jpg

I only find them on top of the leaves, never below. However after manually removing them i found others the day after, letting me think they might hatch from below.
My question is, is there a way to prevent this next time? There are fish in the pond.

Has anyone had experience with bacillus thuringiensis treatments in ponds? Would it have worked in my case?

Thanks
 

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Even this year i'm starting to have the same issue. This time i think i've found their eggs and removed them:
20230517_123547.jpg

However the leaf already has some damage even if i could not find any larvae yet. Maybe adults also do the same kind of damage. The suspect:
20230517_102725.jpg
 
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Just had a look at my old photos in my first post and i could spot some of the same eggs i didn't notice last year. I think i'm on the right track.
 

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