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Sheep, deer, salmon, and a few other nouns have the same form for singular and plural. We say one sheep or ten sheep.
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.
When we use hair to denote a single thread, the plural form is hairs: I found two long hairs in my food.