Evolution Of Sharks Essay

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Only recently have scientists begun to study the magnificent creatures we know as sharks. Unfortunately, along with the recent influx of curiosity regarding sharks and shark species has come a development of taste for the shark and the scarce resources it provides. Shark populations are disappearing faster than ever before, and studies about sharks have come along just as these cartilaginous fish fade from the face of the planet. Shark populations are crashing due to many reasons. For one, sharks have oftentimes been depicted as bloodthirsty predators that prey on humans. This has caused them to assume the role of the unwanted predator, similar to how wolves prey on sheep herds. Sharks are also disappearing due to fishing accidents, as they …show more content…

The shark is embraced and respected, and shark callers regularly capture sharks for food and ceremonies in the village. Many myths and stories involving sharks circulate the village, and the creation story of the New Guinean people states that God created the shark before He created man. Eilperin has come to Tembin in order to meet “the world-famous shark caller”, Selem Karasimbe, whose fame stems from a small documentary done on sharks that aired on television. Shark calling is an ancient method of fishing in the tropics, and is practiced by many males. Females are not allowed to call sharks due to superstitions that women drive sharks away. In shark calling, a rattle is used to create sounds reminiscent of a struggling fish or other prey. The shark caller will then wrestle with the shark hand to hand, oftentimes using a noose-like device and struggling for hours. Successful callers bring much glory to themselves and their families during their lifetime, and many myths and legends surround the practice. However, what was once a practice used only to provide “protein” for the village has now evolved. Shark calling is now more of an economical and commercial occupation rather than a traditional one. Callers oftentimes sell the dorsal fins of sharks to traders for around $7 a fin. This has lead to a decline in …show more content…

For example, concerning reproductive abilities, the pelagic thresher is capable of producing two young per litter. This is in stark contrast to the whale shark, which is capable of producing up to 300 young per litter. Sharks also vary in their tail shapes, feeding habits, and hunting techniques, which have been perfected through natural the natural selection of advantageous genes over millions of years. Multiple senses also aid sharks when feeding. For example, electroreception or the ability to detect injured fish through water vibration. In order to further study shark habits for both hunting and travel, scientists typically tag sharks with trackers in order to expand their understanding of sharks. Tagging allows scientists to draw conclusions and inferences with regard to shark behavior, such as migration patterns. Through tagging, scientists were able to find that the great white shark is a pelagic fish, swimming across vast expanses of open ocean. Another example is the reef shark, which was thought to dwell near the surface exclusively. Through tagging, it was found that the reef shark can oftentimes be observed diving to depths ranging from 400 feet and onward below the surface of the

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