What are two types of freshwater boneless fish?

1. Lampreys: These eel-like fish are jawless and have a circular mouth with teeth. They are parasitic, attaching themselves to other fish to suck their blood.

2. Hagfish: These slimy, eel-shaped fish are also jawless. Unlike lampreys, they are scavengers, feeding on dead or decaying animals.

It's important to note that while both lampreys and hagfish are boneless, they are not truly fish in the biological sense. They belong to a different group of vertebrates called Agnatha.