The singular form of fish is fish. The plural form of fish is also fish. What are their possessive forms?
closed as general reference by FumbleFingers, Bradd Szonye, Matt E. Эллен♦, MetaEd♦, Kristina Lopez May 21 '13 at 14:04
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- Singular possessives always add -’s.
- Plural possessives add -’s if they don't already end in s.
Because the plural fish does not end in s, it becomes fish’s, just like the singular form.
Note: In some contexts, the plural of fish is fishes. Because that does end in s, it becomes fishes’.