I believe it was brought up last year, but can't remember the answer. On page 8 of the fishing guide it states:
WHO DOES NOT NEED A
TROUT & SALMON STAMP
1. Anyone younger than 16 years of age.
2. Holders of lifetime fishing licenses issued to
persons that are blind, have an intellectually
disability, or certain physical disabilities (see
page 10).
3. Anyone fishing waters stocked at no expense
to the state (waters stocked with trout by
another entity, but not stocked by the state

Also on page 8: A Trout & Salmon
stamp is needed for
anyone age 16 and
older to fish in TMA’s,
WTMA’s, Trout Parks
and Broodstock
Atlantic Salmon Areas.
Look for the green
sign in these areas.
In other areas a
Trout & Salmon
Stamp is needed
only by those age 16
and older keeping
trout or salmon.
Look for purple signs
at many of these
locations.
So I take it that I don't need a trout stamp in some state expensed stocked waters as long as I practice catch and release. This seems to be in conflict with the three categories of "who doesn't need a trout stamp." Even though I already have a trout stamp, maybe someone can clarify this for me.