Niebieska means blue, ryba means fish.
So it's "Niebieska ryba".
korek
To say blue fish in Japanese you say ブルーフィッシュ.
ryba (singular) ryby (plural) The word "fish" is countable in the Polish language and hastn't the zero-deriviation {fish} + {s} = fish
"Głowa ryby", if what you write is not a kind of an idiom
a brown and blue fish is un poisson brun et bleu.
You're blue
Polish in Polish is "Polski".
青いベタ /a oi be ta/ would mean 'blue betta/fighting fish' in Japanese.
"Åšledzik" in Polish means herring (a fish).
To say Jonathan in Polish, you would say "Janusz."
"No" in Polish is "Nie".
To say "uncle" in Polish, you would say "wujek."