Do all the trout stocked in Texas come from the same place?
Look on the right hand column of this list.
At the bottom of the page they have the full name of the different hatcheries that supply us with trout.
This statement isn't quiet right, that's just a list of all of the TP&W fish hatcheries. We got a tour of the PK fish hatchery during the Trout 101 event last weekend. They are one of the hatcheries that hold and distribute the trout stockings. I think he said that only two of the hatcheries deal with trout in Texas, but neither of them actually breed and raise trout. The fish at PK came from a hatchery in Missouri.
Basically, TP&W buys the trout, then holds them in tanks and fattens them up before stocking. The fish are all the same size because they are all the same age and have been fed the same amount.
He talked about stocking larger fish and it pretty much boils down to cost. As the fish grow larger, they eventually reach a size where they start eating each other. At that point, you'll have bigger fish, but a whole lot fewer of them. Plus the longer you keep the fish at the hatchery, the more cost, (feed, staff, etc.) get spent on each batch of fish. That means budget would support fewer stockings.
It's a trade off. You get more fish if you stock them at a smaller size, but if they are too small, then nobody is going fish for them and they'll get eaten too quickly by native fish.
One surprise of the tour, was about the white, palomino, golden, or whatever you want to call them trout. The white color is a genetic mutation that occurs naturally. Apparently, 100+ years ago a fish hatchery on the east coast started selective breeding to get more of this coloring and the fish that we see stocked today are descendants of this brood stock that randomly occur. The numbers included in the Texas shipments are random and do not signify anything other than a color that would not survive very long in a natural environment.