Other species requiring caution are the Blacktip, Blacktip Reef, Gray Reef,, Galapagos, Shortfin Mako, and Great Hammerhead Sharks. Sharks weed out the infirm and keep breeding populations healthy. They help maintain the natural balance of the marine ecosystem. Sharks usually feed at night. They typically hunt and feed alone, but some species are known to feed in arge groups.
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.