mcwillja wrote:
They (NY) won't stock fish until water temps are right which means some streams don't get fish until after opening day.
That is an interesting point about NY. Perhaps being just a little farther north makes a difference.
While not addressing early cold water mortality, there is another consideration for starting the season early. As follows:
PA ATW fisheries that have wild trout are the only ATWs I fish. I have long thought one of the reasons there can be a throng of anglers jerking fish out in the opening weeks, yet wild fish remain to an extent to be Class B or A, is that the water is cold and the wild fish are not that "needy" regarding nutrition at the lower temperatures, and hence don't get caught as readily. That plus we frequently have relatively unstealthy anglers about and bright sunshine when they do fish, sending the wiser wild fish to hide. Unfortunately, there are exceptions and certainly cropping happens--any wild trout on a stringer makes me cringe.
The newly stocked trout are either too stupid or hungry or both to tell the difference when the water is cold but not too cold. Fortunately (for the wild trout), they are the ones leading Pickett's charge, as it were (no offense to the bravery of those soldiers, it's just a metaphor).
Of course the water does warm up by May and the second and third stockings, if they happen at all and at lower density, take place in these "required feeding" temperatures. But the crowds are down and hopefully the more sport oriented are dominating the stream by that time.
But with the recent trend toward very warm weather in the months of March and April, this thermal angle may not be as true as previously. Whether this has had anything to do with moving up opening day in PA by region, I have no idea--I rather doubt it; but it seems like a good idea even if accidental to keep the opening early for ATWs with wild trout.
I have no data on any of this it's just a hunch.