2. Spiny Dogfish The spiny dogfish is a small schooling shark that forms groups of hundreds or thousands.

3. Spiny Dogfish The average length is between 75 and 105 cm. They have two dorsal fins and both fins have spines at the anterior part.

4. Spiny Dogfish They may be the most abundant living shark, but fishing pressure along with their slow birth and maturation rates could affect the population.

5. Spiny Dogfish In general, spiny dogfish are believed to have a life span of 30 years, but the maximum reported age is 75.

6. Spiny Dogfish Spiny dogfish is an opportunistic feeder eating whatever prey is abundant. Small fishes along with invertebrates are part of their diet.

7. Spiny Dogfish After 22 months of development, females give birth to 2 to 16 young that are from 20 to 30 cm in length.