Some truth in that. Fish have a clock....and if water temps do not get to the so called spawning temps and the clock says go...they go. I fish the Caney Fork River for trout.....but I also fish it for big black nose crappie....and chunky bluegill. A lot of folks are amazed that big crappie...and plenty of them, come out of that water. The water temps stay around 52-54 degrees year round on upper part of river. Crappie and Gills spawn in that temp.

Regards