Which of the following fishes has the scientific name Oncorhynchus mykiss?

Manel, maybe the Bible. The word fishes is used in at least one story.

I would agree that one goes out Fishing ,and maybe collects many Fish , regardless of species , you have Fish .Perhaps Americanism ?

I wonder from where the word " fishes" came to be? Whether it is a one or a dozen, they are called FISH.

I’m sure the plural of Fish is Fish. Fishes is not a word.