Plural of crucian; multiple specimens of small freshwater fish from the carp family.
Simple plural form of 'crucian,' formed by adding the standard English plural suffix '-s.' Used when referring to more than one of these fish.
Fish plural forms are usually regular in English (unlike 'fish' itself, which can be both singular and plural), so 'crucians' clearly tells you we're talking about a group rather than a single fish.
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