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A collective noun usually takes a singular verb, but when it denotes the individual members of the group and not the group as a whole use a plural verb.
The names of sciences and subjects ending in -ics (like mathematics, physics, politics, gymnastics) generally take a singular verb.
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.