I saw this happen at Lake Perris one day. The trout truck backed up and dumped the trout by the rip rap jetty. The bass moved in and pinned them in against the bank and just slaughtered the trout. Wolfpacks of big bass cruised for about an hour around in circles there. I broke out the AC plug and had a 10 pounder follow it back in but no takers that day. Everyone was tossing the big swim baits.