what do you have for the trout to eat?? copy that, wait for the grasshoppers to come out.
Try salmon eggs in the spring, but most trout i get on eggs swllow them deep.
Try things small like black jigs, look into flies that may resemble aquatic live they thrive on.
Them not eating but still being present means they are healthy and getting plenty to eat.
It may also mean with a put and take like trout, that you could put more in next time or try adding some.
