There are three main groups of fish: those with bony skeletons, cartilaginous fish like sharks, and jawless fish like hagfish. The film highlights the differences in freshwater and saltwater fish ...

They are joined in this group by the equally wonderfully weird lampreys. There are 76 species of hagfish around the world. All are found in salt water but range in preferred depth from the shallows to ...

The Great Lakes where sea lamprey control efforts were most cut during COVID-19 had the biggest surge of the invasive species ...

As Sharma and her team found, cartilaginous fish with jaws, such as the skate embryos they studied, do develop these joints, while jawless fish, such as lampreys and hagfish, lack them.