Hello.

No in the video the fry have nothing to fear from tadpoles they are big enough.

But the Yellow-perch larvae (see the little video) unlike the tadpoles at this stage the tadpoles seem to grow quickly, and with the light I put them in the presence of each other.
The occasion make the larron.(Opportunity make the thief).

https://www.youtube.com/watch?v=BfJoS-37IsE&feature=youtu.be

Perhaps I'am completely in the field.

This spring I will put tadpoles and larvae in a bucket and I will see.
A+