The rationale is that it makes the person saying it sound like they're smart.
I've never seen any real evidence to suggest fish understand what odd numbers are.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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