* It's a local or regional name: "Izumi" might refer to a specific region in Japan, and "Dai" could be a general term for a type of fish in that region.
* It's a misspelling: The name might be a misspelling of a known fish species.
* It's a fictional name: It's possible that "Izumi-Dai" is a made-up name for a fish, perhaps in a fictional story or video game.
To clarify what type of fish "Izumi-Dai" refers to, please provide more context:
* Where did you encounter this name? (e.g., a restaurant menu, a recipe, a book, etc.)
* Can you provide any additional information about the fish? (e.g., its appearance, taste, origin, etc.)
With more information, it will be easier to identify what kind of fish "Izumi-Dai" might be.