Kettle Of Fish Meaning

(idiomatic) A situation which is recognized as different from or as an alternative to some other situation, and which is not necessarily unfavorable.

Example: 2004, Ellen Raskin, The Westing Game, chapter 13:
  "That's a fine kettle of fish," he exclaimed, then turned to his dinner companion. "Fine kettle of fish. I'm so hungry even that sounds good, and from the looks of this menu that's probably what I'll get."
  That is another kettle of fish entirely.