Usually the females don't feed during the spawn. The one you saw with the trout tail may have still been digesting a 2,3 or even 5 day old meal. They typically feed heavily 2-5days before spawning then stop. After they spawn they will resume feeding gradually while they recuperate. While they're actually on the beds they don't eat but will attack in defense of their nest.

Tight lines,
Wade

Tight lines,
Wade