What is salvo fish?

There is no fish species known as "salvo fish." It is possible that you are thinking of a different name, or perhaps there is a specific context or region where this term is used.

Could you please provide more information about where you encountered this term? For example:

* Where did you hear it? (e.g., a restaurant menu, a fishing report, a book)

* What was the context? (e.g., was it being described, or was it part of a recipe?)

* Is there any chance the name is misspelled?

With more information, I can hopefully help you identify what you are looking for.