Haha...
Yeah they are like little sharks...Most fish are opportunistic eaters. They will eat what ever is available at the time. Today they might be eating grasshoppers but tomorrow there might not be any grasshoppers so they might start eating worms instead.
It is all about matching the hatch. If they are eating water bugs, it might be worth trying a lure that looks like those bugs. Or better still, catch some bugs for bait and you just might catch a few more trout
itsaboat mate...Life is just a boat and then ya marry one !