Black dogfish to the clade formed by the granular dogfish ("C. granulatum") and combtooth dogfish ("C. nigrum"). The black dogfish is a common species, with a wide but discontinuous distribution in the temperate waters of the Atlantic Ocean; its range abuts, but does not extend into, the Arctic Ocean. In the northeast, it occurs from Iceland to Sierra Leone, including the Faroe Islands, southern Norway, and the Rockall Trough and Porcupine Seabight off Ireland. In the northwest, it is found from southern Greenland and Baffin Island to Virginia, being particularly abundant in the Laurentian Channel, and may occur further south to the
Nankai Trough gas hydrate site The Nankai Trough, as a continuous gas hydrate research site for over more than a decade, is the first fully integrated field study and modern production test well project for offshore natural gas hydrates in the northwest Pacific Ocean. Six wells were successfully drilled to test natural gas hydrate accumulations off the southeastern coast of Japan, and to explore a conventional Tertiary structure. It gave scientists the opportunity to monitor the physical response of gas hydrate deposits and investigate marine gas hydrates in one of the most active earthquake zones on the planet. Research within the Nankai Trough is expected