[saxmatt]

I did a lot of electrofishing when I worked for the DEP up in CT. During August we sampled a lot of streams and rivers and the trout always swam off fine. If you're pulling trout from deep cold water in a lake and releasing them into the warm surface water they can die of temperature shock, this is why people say you shouldn't fish for them in the summer. You don't have to worry about temperature shock in streams and rivers. If you're into trout fishing I would go help out. It's hard work but it's amazing seeing what's swimming around in our waters.