Periphylla

A day in the life of a jellyfish hunter

The oceans are teeming with ever-increasing numbers of jellyfish. These squishy sea creatures can ruin fishing and discourage tourists. But one research group wants to turn this nuisance into pay dirt.

Jellyfish invaders: Trondheim Fjord in transition

Jarle Mork has spent the last 40 years of his career studying Trondheim Fjord and its finned inhabitants. Warmer waters and the arrival of new creatures are bad news for the fjord’s cod population, he says. But other fishing practices are problematic, too.