Most species reproduce only once every two years, and pregnancy typically lasts a year. Sharks are unable to see things clearly at a short distance. They become energetic and may need more food due to the increasing water temperature. Beyond their food value, sharks show promising medical potential for human. Fishermen cut off the two valuable fins and toss the helpless animal back to starve.
Sharks grow relatively slowly and have low reproductive rates.
Wide-scale and wanton fishing has had a major impact on shark population.