Such picture repeats also in the autumn. After water level lifting, the caviar part is carried away by a current from spawning places. Fishes start to be fed with exclusively caviar and often leave the usual places. It leads to problems at catching of fishes. It is necessary to find places of a congestion of fishes and to find a way of catching and bait presentation. Heavy imitations presented near the bottom usually helped. Probably, heavy nymph got to a sheet of water at the bottom. Here fishes selected caviar. On the other hand, it is possible to explain efficiency of a heavy fly to that full fish simply did not want to rise from a bottom. So, fish ignored flies in thickness of water.