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The Pacific spiny dogfish has a unique system of ventilation. This type of dogfish has five gills on each side of their heads, but do not have gill covers like bony fish. The shark is able to breathe with these gills by swimming or staying in a current. The Pacific spiny dogfish also has a special feature called a spiracle.
The spiny dogfish (Squalus acanthias), spurdog, mud shark, or piked dogfish [4] is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. [5] While these common names may apply to several species, Squalus acanthias is distinguished by two spines (one anterior to each dorsal fin) and ...
The spiny dogfish has broken several records in the areas of migration and gestation. This shark tends to be a highly migratory species: one shark was recorded as travelling 8,000 km (5,000 miles) after being tagged in Washington state, United States, and found again later in Japan.
Dogfish sharks: 3 31 Dogfish sharks have two dorsal fins, each with smooth spines, but no anal fin. Their skin is generally rough to the touch. [18] These sharks are characterized by teeth in upper and lower jaws similar in size; caudal peduncle with lateral keels; upper precaudal pit usually present; and a caudal fin without a subterminal notch.
Jul. 17—For 9-year-old Metta Olson, watching a shark dissection at the Mobius Discovery Center each summer is becoming a tradition. She was in good company Wednesday at the downtown Spokane ...
Protosqualus ("Primitive Squalus") was a genus of dogfish shark that existed during the Cretaceous. Fossils have been found in Europe (mainly in France, Russia, Germany, Lithuania, The United Kingdom and Ukraine), East Asia (mainly in Japan), [5] Antarctica, [6] Australia, [7] India and South America.
Squalus is a genus of dogfish sharks in the family Squalidae.Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal notch.
Scyliorhinidae is a family of sharks, one of a few families whose members share the common name catsharks, belonging to the order Carcharhiniformes, the ground sharks.. Although they are generally known as catsharks, some species can also be called dogfish due to previous na