Lovund resident Ingolf Kristiansen was walking his dog along the bay when he spotted the frozen herring trapped in the ice. He snapped this photo and posted it to Facebook. Experts aren't sure why the fish entered such shallow waters, although an expert at Norway's Institute of Marine Research guesses cormorants might be responsible. The birds could have driven the herring close to land, making it difficult for the fish to escape into deeper water that wouldn't freeze. Saltwater freezes at about 28 degrees Fahrenheit, and temperatures were well below that on Sunday.