i think the opening day has bad effects on ALL freshwater fish not just trout. A lot of you have pointed out that it hinders establishment of a good trout fishery in the rivers and streams. here is another thing that maybe happening in case of trout stockings in lakes. imagin how many people go out to catch trout in lakes end up catching a bass or something and keep it so that they have something for dinner. i mean trout survival in many lakes may not happen anyways(low oxygen levels) so them getting cought, is well, a loss but not something that is really disturbing the already exsisting species in the lake.but on the opening day everybody is fishing and most of them are once a year fisherman who dont really care what they catch or how big or small it is or what the effects are of his catches on the fish population in the lake as long as they can brag about A catch next day at work on how great a fisherman he/she is and serve up whatever he cought to his/her coworkers.And i think there are many who go out for species other than trout to begin with. so here is a day where all freshwater fish are in trouble because of people who fish only on that day and pretty much keep everything they catch.