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Hi, everyone. Fish is uncountable? I know the plural form is 'fish'. I can't say this below, ain't I?

I like fish, especially toropical ones.

Should I say 'I like fish, especially toropical fish.'

Fish is / are beautiful in this sea. Can I use either is or are in this sentence?

Thanks.

LiJ
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I like fish, especially the tropical ones. This is ok. I assume you mean tropical fish in general, not just one individual tropical fish, so you need 'ones'.

The fish are so beautiful in this sea.

(P.S. 'ain't I' does not mean 'can I?'. Ain't I is very-non-standard English for 'am I not?' Generally a feature of less-well-educated speech. I'd advise you to avoid it).
Comments  
The plural of fish can be fish or fishes; it depends on the context.

Fish does have a regular plural form, but it differs in meaning from the unmarked plural; fishes refers to several species or other taxonomic types, while fish (plural) is used to describe multiple individual animals: one would say "the order of fishes," but "five fish in an aquarium." The plural fishes is found in the King James Bible, in the miricle of the loaves and fishes, for example, and is also sometimes used for rhetorical emphasis, as in phrases like sleep with the fishes.
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Thank you Bokeh.

I like fish, especially toropical fish. or the toropical one

Fishes are so beautiful in this sea. / Fish is so beautiful in this sea. Both are okay?

LiJ
 nona the brit's reply was promoted to an answer.
Thanks Nona.Really understandable. Yes, I should have said 'can I'. It's really grammatically a big mistake. You helped me learn what I didn't know about 'ain't'. Emotion: smileThanks.

LiJ
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LiveinjapanHi, everyone. Fish is uncountable? I know the plural form is 'fish'. I can't say this below, ain't I?
I like fish, especially toropical ones.
Should I say 'I like fish, especially toropical fish.'
Fish is / are beautiful in this sea. Can I use either is or are in this sentence?
Thanks.
LiJ