Cananda’s Greenland Shark and Elasmobranch Education and Research Group (GEERG) recently posted a video featuring the successful tagging of a Greenland shark (Somniosus microcephalus) to their YouTube channel. The tagging process seen in the video involves diving in 10 ºC (50 ºF) water with very little visibility, off of Baie-Comeau, Québec.
The Greenland shark is a coldwater species that can inhabit subarctic and arctic waters as cold as -2 ºC, according to Canadian Shark Research Laboratory. It is believed to be the only shark species that can inhabit these water. The average length of adult Greenland sharks is 11 to 16′ (3.5-5m), with the largest Greenland shark on record being measured at 21′ (6.4m). The species is also known to inhabit extreme depths.