Is there a situation where an accepted uninflected plural variant is not available?

When would you use fishes instead of fish? The same goes for fruits and any other word where a different plural form exists but the singular is most commonly used for plural. I am looking for a sentence where the singular form would be wrong and the explicit plural form must be used instead.

The following pages do not answer my question:

Irregular plurality situations in English

When is it correct to not use the irregular form for a plural? e.g. mouses vs. mice (fish & fishes)

Solution 1:

"Trout, greyling, and char are technically all salmons."
"Squids is a video game."
"Many fishes and snakes move by contracting muscles in waves down the body, which bends the body to each side."