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Sharks are a fascinating group of fishes that strike fear into the minds of humans. This fear is really a fear of the unknown, for little evidence exists that indicates sharks are really very dangerous. Sharks have much more to fear from humans than humans have to fear from sharks.
Most sharks are active predators and eat primarily fish, although the great white shark will also prey upon seals, sea lions and other marine mammals. Some sharks eat bottom-dwelling animals such as crabs, and others scavenge for dead animals. Some sharks such as the whale shark feed rather passively by swimming with their mouth open to collect plankton and small fish. Sharks are high on the ocean's food chain. They typically eat thousands of smaller fish during the course of their lives. As predators, they conserve energy by eating the slow, weak or sick fish in a school. They are, therefore, important to the ecological balance of the marine environment in that they eliminate the genetically weaker animals in a population as well as keeping population sizes in balance.
From the currently known 30,000 fish species some 1100 are sharks of which 1000 are living in marine waters and 100 occur in freshwater. An alarming 40% of the recorded sharks species at the IUCN are listed as threatened and endangered and for 35% of them sufficient data are missing.
Sharks, and their relatives the rays and chimaeras, provide about 1% of world fisheries landings reported to FAO, or some 700,000 to 800,000 tons; perhaps 70-100 million animals. About 60% of these are sharks, around 40% skates and rays. These figures are undoubtedly an underestimate, because many countries under-report their catches and ignore bycatch, discards and recreational fisheries. Actual catches may be twice that reported. Also, there is worldwide concern that the increased demand for shark fins will have a devastating impact on shark populations and stocks. Shark fins are a highly prized commodity in many Asian cultures. Shark fins infer financial status and are traditionally used in soups served at important occasions. The increase in middle-class wealth in many shark fin consumer countries has significantly increased the demand for such products; the largest market is Hong Kong. The 2005 FAO estimate of world exports of dried shark fins was US$ 220 million.
There is strong evidence that populations of sharks and rays have declined considerably in recent times. This decline is generally attributed to increasing fishing pressure, the effects of which are accentuated by the generally slow growth, late maturity and low reproductive output of most sharks and rays. Other major threats to sharks include habitat alteration, damage and loss from coastal developments, pollution, and the impacts of fisheries on the seabed and food species.
Most shark fisheries around the world are virtually unmonitored and completely unmanaged. However, it is widely recognized that the need for introducing shark fisheries management is now very urgent and that a precautionary approach to the management is essential. One of the major problems associated with monitoring and enforcement is the likelihood of misidentification. This can arise both because some shark and ray species are difficult to distinguish morphologically, and because of ethnic differences in understanding or interpreting common names. Also, little is known of the identity of species in confiscated shark fin catches and processed shark meat, but in recent years genetic approaches have been deployed to resolve this issues.
