What is the diminutive of salmon?

There isn't a widely accepted diminutive for "salmon". The word itself is already fairly short and simple, and there isn't a common practice of using diminutives for fish names in English.

If you wanted to convey a sense of smallness or affection, you might use descriptive phrases like:

* Little salmon

* Tiny salmon

* Baby salmon (for a young fish)

* Cute salmon (if you want to be playful)

Ultimately, the best way to express a diminutive of "salmon" depends on the specific context and intended meaning.