"这些鱼非常贵。"
Translation:These fish are very expensive.
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Fish is one of those strange words in English where you don't change the word whether there's 1 of them or 100.
https://www.theenglishspace.com/grammar/nouns/irregular-plural-list.html
1035
"Fish" can be singular or plural.
"Fishes" means, specifically, more than one type of fish. It is also unusual in everyday speech.
E.g. "There are many fish in that school." (There are many of the same kind of fish)
"There are many fishes in that aquarium." (There are many kinds of fish on display)
Joy to the world, To all the boys and girls Joy to the FISHES in the deep blue sea, Joy to you and me!
1068
The subject is 这些鱼, "these fish". Your sentence's subject is just "these". Your sentence would be 这些是非常贵的鱼 I believe (assuming you can use 这些 as a subject).
Fish is usually the plural form of fish. There are a couple of exceptions but they are quite obscure. The first is biblical and song writing. The phrase "Bread and fishes and a jug of red wine" for example and the next being biology.
A specific example here can be given as diving. Upon returning they might ask "What did you see?"
You could respond "I saw four fish", which could mean four individual fish they may or may not belong to the same species. It may even be four fish in one shoal. Where as if you saw four shoals of fish that were different species or just our individual species of fish you could say, "I saw four fishes".