I mentioned because it's one of those funny nouns (as is fruit) which can be used either as a singular or a plural.

"Would you like some fruit?" is used (rather than fruits), while we talk about enjoying the "fruits" of our labour.

Likewise, we talk about there being plenty of fish (not fishes) in the sea, and at the same time Erasure can sing about how "the fishes in the sea" have gone to sleep. 

🤓