Question: Bull pipefish inhabits what  ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent?

Context paragraphs:
Norwegian Sea: The Norwegian Sea (Norwegian: "Norskehavet" ) is a marginal sea in the North Atlantic Ocean, northwest of Norway.  It is located between the North Sea (i.e. north of the United Kingdom) and the Greenland Sea and adjoins the North Atlantic Ocean to the west and the Barents Sea to the northeast.  In the southwest, it is separated from the Atlantic Ocean by a submarine ridge running between Iceland and the Faroe Islands.  To the North, the Jan Mayen Ridge separates it from the Greenland Sea.

Greenland Sea: The Greenland Sea is a body of water that borders Greenland to the west, the Svalbard archipelago to the east, Fram Strait and the Arctic Ocean to the north, and the Norwegian Sea and Iceland to the south.  The Greenland Sea is often defined as part of the Arctic Ocean, sometimes as part of the Atlantic Ocean.  However, definitions of the Arctic Ocean and its seas tend to be imprecise or arbitrary.  In general usage the term "Arctic Ocean" would exclude the Greenland Sea.  In oceanographic studies the Greenland Sea is considered part of the Nordic Seas, along with the Norwegian Sea.  The Nordic Seas are the main connection between the Arctic and Atlantic oceans and, as such, could be of great significance in a possible shutdown of thermohaline circulation.  In oceanography the Arctic Ocean and Nordic Seas are often referred to collectively as the "Arctic Mediterranean Sea", a marginal sea of the Atlantic.

Narrow-snouted pipefish: Narrow-snouted pipefish ("Syngnathus tenuirostris") is a pipefish species, inhabits the Mediterranean basin: Adriatic Sea, Tyrrhenian Sea, and Black Sea.  Marine demersal, ovoviviparous fish.

Gulf of Mexico: The Gulf of Mexico (Spanish: "Golfo de México" ) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent.  It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba.  The U.S. states of Texas, Louisiana, Mississippi, Alabama and Florida border the Gulf on the north, which are often referred to as the "Third Coast" in comparison with the U.S. Atlantic and Pacific coasts, or sometimes the "south coast", in juxtaposition to the Great Lakes region being the "north coast."  One of the gulf's seven main areas is the Gulf of Mexico basin.

Yukon-Tanana Terrane: The Yukon-Tanana Terrane (YTT) is a tectonic terrane that extends from central Alaska through central Yukon and into northern British Columbia, Canada and Southeast Alaska, USA.  Extending over 2000 km, the YTT is the largest tectonostratigraphic terrane in the northern North American Cordillera.  The Yukon-Tanana Upland is a physiographic province mostly underlain by rocks of the Yukon-Tanana terrane.  The YTT consists of polymetamorphosed and polydeformed metasedimentary, metavolcanic, and metaplutonic rocks of Upper Paleozoic and older ages that were deposited or emplaced near the edge of the North American continental margin.  Rocks in the terrane record a variety of tectonic settings and have experienced varying amounts of tectonic transport, both before and after amalgamation of the YTT with North America.  Sequences of mainly parautochthonous quartz-rich sedimentary rocks derived from the North American continent also include meta-igneous rocks with mostly continental geochemical and isotopic signatures.  Structurally higher sequences contain meta-igneous rocks with arc and back-arc characteristics.  The Slide Mountain/Seventymile terrane, composed of volcanic rocks typical of seafloor and of typical seafloor sediments, is recognized as an ocean basin that divided parts of the YTT before amalgamation of the Yukon-Tanana Terrane with the continental margin.

Coastal states: A coastal state is a state in the United States of America that borders a major body of water, such as an ocean or lake.  There are three oceans that border the United States: the Pacific Ocean (this includes the Gulf of Alaska and the Bering Sea), the Atlantic Ocean/Gulf of Mexico, and the Arctic Ocean (this includes the Chukchi Sea and the Beaufort Sea).  The Great Lakes are contained inside the North American continent and consist of Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario.

Baffin Bay: Baffin Bay (Inuktitut: "Saknirutiak Imanga"; Greenlandic: "Avannaata Imaa" ; French: "Baie de Baffin" ), located between Baffin Island and the southwest coast of Greenland, is a marginal sea of the North Atlantic Ocean.  It is connected to the Atlantic via Davis Strait and the Labrador Sea.  The narrower Nares Strait connects Baffin Bay with the Arctic Ocean.  The bay is not navigable most of the year because of the ice cover and high density of floating ice and icebergs in the open areas.  However, a polynya of about 80,000 km2 , known as the North Water, opens in summer on the north near Smith Sound.  Most of the aquatic life of the bay is concentrated near that region.

North Sea: The North Sea is a marginal sea of the Atlantic Ocean located between Great Britain, Scandinavia, Germany, the Netherlands, Belgium, and France.  An epeiric (or "shelf") sea on the European continental shelf, it connects to the ocean through the English Channel in the south and the Norwegian Sea in the north.  It is more than 970 km long and 580 km wide, with an area of around 570000 km2 .

Bull pipefish: Bull pipefish ("Syngnathus springeri") is a pipefish species, inhabits the Western Atlantic from Canada to North Carolina (United States), Bahamas and northeastern Gulf of Mexico to Panama.  Marine subtropical reef-associated fish, up to 38 cm length.

Blake Plateau: The Blake Plateau lies in the western Atlantic Ocean off the southeastern United States coasts of North Carolina, South Carolina, Georgia and Florida.  The Blake Plateau lies between the North American continental shelf and the deep ocean basin extending about 145 kilometers (90 miles) east and west by 170 kilometers (106 miles) north and south, with a depth of about 500 meters (1,640 feet) inshore sloping to about 1,000 meters (3,281 feet) about 375 kilometers (233 miles) off shore, where the Blake Escarpment drops steeply to the deep basin.  The Blake Plateau, associated Blake Ridge and Blake Basin are named for the U.S. Coast and Geodetic Survey steamer George S. Blake, in service 1874-1905, that first used steel cable for oceanographic operations and pioneered deep ocean and Gulf Stream exploration.  Survey lines of the steamer "Blake" first defined the plateau that now bears the ship's name.

Supporting paragraphs: Bull pipefish Gulf of Mexico
Answer: Gulf of Mexico