How do fish vomit?

Fish don't vomit in the same way that humans do. They lack the muscles and structure in their digestive system needed for projectile vomiting.

Here's what happens instead:

* Regurgitation: This is the most common way fish get rid of unwanted food. They use a reflex that pushes food back up from their stomach through their mouth. This is often done to get rid of indigestible material like bones or shells.

* Excretion: Some fish may also pass unwanted material through their anus, similar to humans. This is more common for substances that have already been digested.

It's important to note that fish don't vomit to expel toxins or get rid of bacteria like humans do. Their bodies have other mechanisms to deal with those things.

Therefore, while fish can get rid of unwanted food, they don't vomit in the traditional sense.