Read on game's wiki that ocelots won't despawn if you feed them fish and make them trust you, but in my game they still do despawn after I leave the area.
Trapping them in boats won't prevent despawn either.
Linked issues
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We're tracking this issue in MC-173981, so this ticket is being resolved and linked as a duplicate.
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I think this is a duplicate of MC-173981, however, I'm not 100% certain.