Do Jawless Fish Have Lungs?

For jawless fish, there are two common ways to take in the water they need to breathe. They have a specialized breathing tube called a nasopharyngeal duct, which leads to their gill pouches. Hagfish can also take in oxygen through their skin while buried in mud!

Does a hagfish have lungs?

BREATHING WITH LUNGS

Anyway, most of them have both gills and lungs. These species with the two mechanisms usually use the air in certain occasions: When the oxygen level in the water goes down.

Do hagfish have gills or lungs?

Unlike most fish that have a complex arrangement of gills, hagfish have a simplified set of gills in a series of paired pouches that open to the pharynx and the exterior. Water enters the body through the snout, is compressed in the body and expelled through these breathing pouches.