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Fish as food or in bulk (= large numbers) is always singular. We rarely use the plural form (fishes) which denotes fish individually: I caught three small fishes.
(A dozen = 12): I'd like to buy a dozen eggs. When dozen isn't preceded by a numeral (like three) or by a we use the plural form: There were dozens of eggs
Adjectives can't take the plural form, even when they're used as nouns in the plural.
When only one thing is meant we say a clap of thunder and a flash or bolt of lightning.