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.


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

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