First off those are absolutely Brown Trout. Browns have dark spots on a light background.
Lake Trout have light spots on a dark background. Lakers alweays have forked tails,
Browns always havbe squared off tails. I could go on and on but I'm sure that's not necessary.
That said, the more amazing aspect of this that NewCroton Reservoir isn't considered a
trout lake at all as it receives no stockings. But there seem to be some reports that Browns
exist there so this is truly quite a feat both in terms of size and location.
Ken H