On Mathematica.SE I found:
What distribution this tuple follows is a different kettle of fish.
I would like to understand how and when to use the phrase kettle of fish and why it can be used alongside with pretty or whole-new.
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1Have you tried to do a Google search for "kettle of fish define"?– Alan CarmackCommented May 15, 2016 at 6:38
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1 Answer
A whole nother kettle of fish (or similar) is an idiomatic way of saying it's a different concept altogether.
kettle of fish noun
a state of affairs
Source: Dictionary.com