What do you call a fish that practices medicine?

This joke swims in the delightful waters of wordplay, specifically a pun that hinges on homophones – words that sound alike but have different meanings. The humor comes from the unexpected twist of hearing a familiar medical profession, "surgeon," cleverly disguised as the name of a real-life fish, "sturgeon." It’s a classic setup-punchline structure that relies on the audience making the auditory connection.

A sturgeon is a fascinating, ancient fish, some species of which can grow to be quite enormous, reaching lengths of up to 14 feet and weighing hundreds of pounds. They are often characterized by their bony plates, or scutes, and their long snouts. Historically, they've been highly valued for their meat and especially their roe, which is known as caviar. On the other hand, a surgeon is a highly trained medical doctor who (Review) specializes in performing operations to treat injuries, diseases, or deformities. The absurdity of a fish performing surgery is what makes the pun land.

So, while you're unlikely to find a sturgeon performing an appendectomy, the similar sound of its name to a skilled medical professional makes for a fin-tastic little chuckle.