What does a jack salmon look like?

There is no fish species called a "jack salmon". It's likely you're thinking of one of these terms:

* Jack Salmon: This could be a slang term for a smaller, immature salmon, often used in reference to Chinook salmon.

* Jack Mackerel: A small, immature mackerel, also sometimes called "Spanish mackerel" in some regions. These are usually smaller and more slender than adult mackerel.

To better understand what you're looking for, could you please provide more context?

For example:

* Where did you hear the term "jack salmon" used?

* What kind of salmon are you interested in?

* What is the size and shape you're imagining?

With more information, I can help you find the correct fish species.