In the year before last I had a lot of anacharis in the pond and ended
up with 60-70+fry.
Last year I did not have so much anacharis and had less than half the
fry. In my opinion they do eat fry. They also eat the fish that die
because three of my large goldfish are gone since fall. There are
racoons and possums around but the fish were there when it iced over.
When it started to melt I noticed fewer of the large fish came to the
top. Happy water gardening.