Shark scales, or dentricles, are roughened and will scrape if felt to wrong way, much like sandpaper. The true purpose for this is unknown, although it is thought the shape increases streamlined properties. Sharks have two pairs of fins and four singular fins, all of which are used for swimming or balance. The rear pelvic fins in males are lengthened to aid in reproduction. The oil in the shark’s liver adds buoyancy, due to the lack of a swim bladder. The gills are protected by gill arches and slits, and most sharks must swim continuously to keep oxygenated water flowing over their gills. Some sharks, such as the wobbegong or nurse sharks, have developed the ability to lie on the ocean floor and forcefully pump water over their gills. The body …show more content…
Many species are endangered or at risk of becoming so due to this. Smaller sharks, such as the dogfish, have less issue of this due to the lack of fishing and industry they pose. Larger sharks are also often able to avoid population drops and fishing, simply due to the cost of catching one outweighing the benefits. The sharks that are hunted are common species such as great whites, tiger sharks, and other oceanic breeds that are easily found. When a shark is caught, it is either killed for its teeth and scales or for the purpose of finning. If the shark is finned, the pectoral, dorsal, and often caudal fins are removed and the shark, usually still alive, is thrown back into the water. Unable to swim and hunt, it soon dies.
One way to lessen the effect of finning and sport hunting on shark populations is to flood the market with artificial yet genetically real fins, such as has been done with rhinoceros horns. If the price drops, the amount of sharks killed annually will fall with it. Doing this will also help return ecosystems back to the way they were before the top predators had been hunted out of the area. This will aid in managing fish populations as well, especially those not fished commercially such as jacks and
Sharks have also been subjected to medical research, games and competitions, jewellery, souvenirs and cosmetics. We need to take into consideration that sharks play a vital role in the natural world that we live in. it is imperative that we look after these majestic creatures and ensure they remain protected. We need to be aware of the dangers of sharks, swim in protected areas where there are shark nets, and do not swim after dark in the sea (especially not alone) as the sea is the sharks home. Humans should also be wearing wet suits as protection in the ocean. The sea is where they live, they swim freely and they eat – they do not particularly target humans but rather prey on food that is available to them in their habitat.
So why do we need sharks? Well, Sharks help keep the ocean healthy and clean for over 450 million years. They also help remove half of the worlds green house gases and produces oxygen more than all of the rainforest's combined! Sharks are just as important as all the trees in the world because they have one thing in common, provide us with oxygen. Without the sharks help we wouldn't be able to get rid as much of the greenhouse gases as we want to, which means global warming would have a lower rate of happening faster. Most importantly they provide us with food. How? They would usually eat the old, sick or slower fish in the population of the ocean to the right size so the prey species don't cause harm to ecosystem by becoming to populated. They are also at the top of the food web. If all the sharks went extinct the entire food web would collapse causing many other species of fish to disappear. So instead of killing the sharks, we could lure them away to somewhere else. As they have a huge impact to the environment.
One of the governments main reasons for culling the sharks is because they are coming in too close to the shores and becoming a potential threat to swimmers. But why is this happening? This is due to a change in shark feeding habits, but because they are eating more human of course not! Rather because us humans are over fishing and eliminating the fish/food sources of which sharks normally feed on. This is forcing sharks to come in closer to find food. Us as humans have forced sharks to come in closer and are now killing sharks because of our a...
In warmer waters Bull Shark mating occurs year-round while mating females usually receive mating scars on their dorsum, “the back or outer surface of an organ…” (“dorsum”). They typically carry from one to thirteen pups at one time for ten to eleven months. When the female Bull Sharks gives birth it gives birth to free swimming, live young in their nursery grounds that are again, in areas with low salinity and shallow waters (Curtis). The Pups that survive will be around 56 to 81 centimeters long at birth, and grow approximately to be around 340 centimeters when fully matured (Simpfender & Burgess). Female Bull Sharks are typically larger than males when fully grown and mature; the lifespan for both males and females is around 16 years (Curtis). Females on average are around 180 to 230 centimeters long and 285 pounds, and males on average are around 157 to 226 centimeters and 209 pounds, but the biggest known Bull Shark was reported to be 11.5 feet and 500 pounds (Simpfender and Burgess; Curtis). “Bull sharks are pale to dark grey [on their dorsal, and fade] to white on their [ventral, but on] younger individuals the fins have black
They have paired fins that lift the shark, as it is able to swim; paired pelvic fins, which stabilize the shark and letting it steer to reach its prey in a more effective manner; dorsal fins also further aide the shark in stabilization as well as the anal fin. For propelling, the shark uses the caudal fins. The caudal fins allow the shark to charge directly toward its prey.
Information (sub-point): The solution to the problem of shark finning is to sign petitions and force the government to pass legislature that will ban shark finning, as well as ban the import of shark fins. In 2000, Bill Clinton signed the Shark Finning Prohibition Act of 2000 (SFPA), which “banned finning on any fishing vessel within United States territorial waters, and on all U.S.-flagged fishing vessels in international waters” (Speigel, 2011). Currently, it is also illegal to hunt sharks in many parts around the world due to various restrictions set by other government, but it is not illegal to import and sell shark fins. Finding shark fins in the US can be as easy as walking into an Asian restaurant and ordering shark fin soup. If we truly want to make a difference, and see a rise in the shark populations around the world, we need to ban the sell and trade of shark fins
A great white shark can get anywhere from 12 inches to 60 feet long! They can also weigh anywhere from 150 lbs. to 3000 lbs. There is no difference between males and females. Great whites have six senses. Sight, smell, taste, touch, hearing and an Electro-Reception they get through the nose to communicate with other sharks! They can swim up to 35 mph and have 3,000 teeth in several rows.
Shark nets have been implemented in locations across the world in response to shark sightings and attacks. Nets are submerged beneath the surface of the water, roughly 200 metres from the shoreline. The meshing is designed to be large to capture sharks, leaving them to struggle before eventually drowning under the weight of their own body. The meshing allows small fish to pass through, however captures larger fish and marine species. Shark nets provide no discrimination between common, vulnerable and endangered species, resulting in a high mortality rate for a variety of marine wildlife.
Sharks appear to be very vicious creatures that will eat or kill anything in its path. People think that all sharks are harmful and deadly to humans. However, research shows that this statement is not true. Sharks can be trained and tamed. They are just like big, aquatic dogs. Only about 2 dozen types of sharks are potentially harmful to humans. Shark attacks are also much more uncommon than one may think. Despite their fearsome appearances, sharks are not as vicious as they look.
Every year, there are about 100 million Sharks killed, ultimately for its commercial success. Their fins are used as the main ingredient for a dish so-called Shark soup. However, many are unaware of the actual importance of Sharks' existence on Earth. They do a number of things to control and balance aquatic life down below, which in return affects how we live on the surface. Sharks have existed in our world for over 400 million years, if they were to suddenly disappear for industrial purposes, much problems will be encountered throughout the world. We must preserve the lives of Sharks, for many reasons most importantly that shark hunting is morally wrong, it may provide economic failure in a given time, and it may serve a critical unbalance of a healthy environmental state.
Shark slaughter has led to shark populations being rapidly decimated all around the globe. Fishermen report that sharks are also getting smaller because they are not being given enough time to fully mature. Although there are other fish that are targeted more than sharks, they are not exactly affected by the kind of endangerment that sharks are currently experiencin...
Back in the dynasty the Emperors would serve the dish to honor the guest, because they believed it had healing benefits from the concurring of a shark (Fairclough, Caty). Fin soup still occurs today even when not on special (Fairclough, Caty). In addition the shark fins for can sell for a pretty penny anywhere from $500 a pound or even $1,000 a kilogram (Fairclough, Caty). As a matter of fact, fishermen in Melbour, Segal would export $1300 pounds worth of shark fins a week. It was recorded that a single adult fin sells for $80 and a two-meter monster can sell for $300. Additionally, 1 out of every 100 sharks reported killed between 2000-2008 comes from these fisherman(Hinshaw, Drew). (commentary) about Its question that fisherman practice “unsustainable finning” because it does pay nice , but the amount of money gained by finning isn’t comparable to how much sharks are worth to our economy. The global value of shark finning is around $630 million but is declining, while shark tourism is worth $312 million and promises to be worth $780 million in 20 years ( source 8). Human activity of finning isn’t the only reason to the decline of Great White sharks, human protection is another
Thesis: Sharks should be conserved because they are an important part of the ocean, attacks are often incidental, and human behavior influences the behavior of sharks.
The overfishing for shark fins has decimated certain species and endangered other species of sharks. Sharks have existed for thousands of years. Scientists have proved that ancestors of today’s shark species existed during the age of the dinosaurs. Sharks have resisted extinction for so long because of natural selection, but since the new delicacy of shark fin soup has become popular in mostly Asian countries they might not resist extinction for much longer. Sharks are extremely vulnerable creatures, despite their frightening amount of teeth. While it takes humans on average thirteen years to reach sexual maturity, it takes sharks up to 20 years and they produce very few offs...
The morphology of whale sharks is mostly similar to aquatic fish species, but many specific traits help differentiate them from the rest. Whale sharks are the largest fish in the world and can reach a size of around 20 meters (Martins, C., and C. Knickle). This is often compared to the size of a school bus. The shark has a very large transverse mouth. They have 5 very large gill slits and have a larger first dorsal fin compared to the second one (Whale Shark). They have a distinctive spotted “checkerboard” pattern with stripes (Martins, C., and C. Knickle). It is not exactly known why they have this specific body marking. It is believed that the body markings act as a camouflage. The strange thing about whale sharks is that they have 300 rows of teeth that play no role in feeding (Martins, C., and C. Knickle).