Back when the Vikings ruled, blue mussels had a natural habitat in Svalbard. They disappeared when the climate cooled, but today blue mussels have re-established themselves at 78 degrees North. The Svalbard blue mussel is thus a clear and present climate indicator of a warming Arctic.
For years catches of shrimp have been shrinking and fishermen have had good reason to be concerned about their livelihoods. But the crunch on these crustaceans in the Skagerrak seems to be letting up.