Spiny dogfish, also known as Mud Shark, Piked Dogfish, Skittledog, Spotted Dogfish, White-spotted Dogfish, Codshark, Thorndog, and Squalus acanthias (in Latin) lives in Atlantic and Pacific Oceans on both sides of North America.
The spiny dogfish/mud shark has dorsal spines, located in front of its two dorsal fins, no anal fin, and white spots along its back.
If the mud shark is captured, it can arch its back to pierce the attacker with its two dorsal spines. The spines are mildly poisonous. The venom of the shark is held in the tissue which is embedded in the groove along the spine. The poisonous sting can be very painful for humans. Their sting might even be lethal, but it is not yet confirmed.
Mud sharks have the longest gestation period among all vertebrates. About 2 to 11 pups are in each litter.
Mud sharks live from 25 to 100 years.
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