Sharks, along with their relatives the skates, rays and chimaeras, are cartilaginous fish that have existed for over 400 million years. While they are classified as fish, their biological characteristics are more similar to that of sea turtles or whales than of bony fish. In general, sharks are characterized by their slow growth, late maturity, long life and low fecundity (the ability to reproduce). Due to these life-history characteristics, shark populations typically grow very slowly, leaving them exceptionally vulnerable to overexploitation and slow to recover from depletion. While a considerable amount of scientific research has been carried out, much about these species is still unknown.
Sharks came into existence more than 400 million years ago and are still around. Click here to learn more about shark's.
Did you know that sharks have small jelly filled sacs to detect minute electrical currents? Click here to learn more about.
"Shark Love" looks at how we feel about sharks as friend or foe, and what it means for the sharks. Listen here.