Pike will eat other fish smaller than itself including Roach and Dace
Yes, it is a fish.
roach
would a cricket kill a small roach
no it do not hurt
Roach
S. W. Roach has written: 'Storage and transport of fish in refrigerated sea water'
It is possible for a mole to eat roaches in their diet as a protein source. This could help in roach control preventing over population.
Trout, tench, shark, roach
Yes. Some central European nations salt them.
Whales eat krill and other fish. Fish eat other fish, depending on what type of fish it is.
There are fish that do eat them, but not ALL fish eat them.