INTRODUCTION Although sharks belong to the class Chondrichtyes, there are many different types. Sharks arose about 350 million years ago and have remained virtually unchanged for the past 70 million years and still comprise a dominant group. It is thought that sharks almost certainly evolved from placoderms, a group of primitive jawed fishes. It took a long series of successful and unsuccessful mutations with fin, jaw positions etc to give us all the different designs of sharks around today. When asked
Sharks Sharks are one of the most feared carnivores in the sea. There are 365 species of of sharks in the sea as we know today. All sharks are carnivores. Most of them eat live fish, including other sharks. A shark's most common natural enemy is an another shark. Most sharks eat their prey whole, or they tear off large chunks of the bodies. Some sharks crush their prey. Others take out small pieces off flesh from large fish. Sharks also feed on dead or dying animals. Sharks have the reputation
as the shark. The earliest evidences of sharks are isolated spines, teeth and scales that appeared about 430 million years ago in the Silurian Period, known as the "Age of Fishes". Sharks have a sleek, streamlined design which helps them swim without using up a lot of energy.They certainly need to conserve their energy because they never really sleep and most of them never stop swimming. Some sharks are fierce predators, and would be happy to eat you if they encountered you. Almost any shark six feet
Sharks kill an average of about 12 humans per year. Humans kill an average of about 11,417 sharks per hour. Unfortunately, that number may not stop growing unless action is taken. Shark slaughter is becoming an ever expanding issue that could have devastating effects if it is not stopped. As a result of a tremendous increase of demand in shark fins in recent years, sharks are being finned and thrown back into the water where they are left to suffer an excruciating death which can take days to occur
Biology Mr. Girod April 28, 2014 The Bull Shark The Carcharhinus leucas commonly called the "bull shark" is a very unique shark. The bull shark can live in both salt water and fresh water but is commonly found along the Mississippi River and around Nicaragua. The bull sharks has a very blunt rounded nose giving it a bullish type of appearance thus giving it the name bull shark. The sharks are a dark black to a light grey with a white underbelly. Bull sharks can grow to be about 350 cm long and weigh
Sharks now are a lot more dominant than they were before, seeing something put up a fight with a great white is very rare. Most sharks are carnivores and do not seem to have very much competition for food because of their size and ability to hunt. Not all sharks now are at the top of the food chain but for the most part there are not many other creatures that will put up a good fight with a shark. Just like an creature on earth as time goes on something’s are no longer needed and eventually with
Sharks are one of the most endangered species in Australia, and it’s our responsibility to help protect these sharks from being over-fished. Many fishing markets fish sharks but deteriorate physical features that help with distinguishing sharks and is very difficult to differentiate between them, since they are produced the same way- as fish and chips. In this experiment DNA samples have been taken from sharks from the NSW Shark Meshing Program. The DNA was extracted and amplified for the production
The Effects of a Decline in Sharks to Ecosystems Predation has strong effects on the structure of communities and ecosystems. Many different types of predators have been studied, both terrestrial and oceanic. Although larger marine animals like sharks have barely been studied. Since sharks are some of the largest and wide-ranging predators in the ocean, their ecological role must be of importance. Recently shark populations have declined due to fishing. This has brought them the attention of ecologists
A tale of mistaken identity: the ragged tooth shark (Carcharias taurus, Rafinesque 1810) and the story behind a misunderstood creature T. Ngcongwane, Dept. of Zoology and Entomology, University of the Free State: QwaQwa Campus, Phuthaditjhaba, Kestell Road, 9999 (+27)79 964 7598 2010141469@ufs4life.ac.za Introduction “Shark! There’s a shark in the water!” Possibly one of the scariest phrases you will ever encounter when out on the beach for a tan or walk. That fearsome predator that has got
Shark Conservation Abstract Arising over 350 million years ago, the shark species has been labeled as a human devourer. Now, with the increase in human population, the demand for shark meat, fins, and cartilage are at an all time high; therefore, the existence of the shark is becoming a concern (Budker 1971). Individuals are conditioned to think of sharks as a negative aspect to the environment, which is prolonging the effort to save shark species from becoming extinct. With that in mind
Greenland Shark Sharks live in almost every part of the oceans, from coastal environments to deep-sea habitats. They also live in the warm waters of the tropics to the cold frigid waters of the polar region. The Greenland shark, also known as “somniousus Microcephalus,” lives in the dark, cold waters of the North Atlantic (I 65). The Greenland shark belongs to the order Squaliforms, more usually known as dogfish sharks. There are 70 species in this order, which includes the spied sharks, spiny dogfish
SHARKS There are more that 250 species of sharks, ranging from the harmless whale shark to the ferocious great white. I will describe the feeding habits and localities of the three greatly known to mankind: the great white shark (Carcharodon Carcharias), the tiger shark (Galeocerdo Cuvieri), and the bull shark (Carcharhinus Leucas). The great white shark, known as Carchardon Carcharias, feeds regularly on marine mammals, such as seals, sea lions, otters, dolphins, and whales. Samuel Gruber in Discovering
The great white shark is a very interesting animal. They get their names from their appearance. The great white shark is very big and has a blue stomach. The great white shark can be found in the pacific, Atlantic and Indian oceans. The number of great white sharks in the United States and in the world is unknown because it is too hard to keep track of all of them. They live in salt water and do not claim territories. A great white shark can get anywhere from 12 inches to 60 feet long! They can also
Sharks remain very well identified for their strong well known nature as a king in the ocean. Still, they encounter the threat of going extinct. Who has the ability to threaten the life of these innocent fishes? It’s always the adroit Human! Sharks poaching activities have been prospering since the early 90s, it can be accounted by the drastic growth of the economies and population in some Asian countries mostly the Chinese and Taiwanese, which led to the increase in demand for shark fin soup due
Hammerhead Sharks Marine Science/ Per. 1 Sharks are one of the most feared sea animals. They live in oceans across the world but are most common in tropical waters. There are over three hundred fifty species of sharks. They can be broadly categorized into the following four groups: Squalomorphii, Squatinomorphii, Batoidea, and Galeomorphii. The shark family Sphyrnidae that includes the Hammerheads are part of the Galeomorphic classification. They are probably the most easily recognizable of all
Great White Sharks In 2015 only 59 shark attacks have occurred around the world compared to the millions of sharks killed by humans every year. Due to these accidental shark attacks people tend to think that sharks, especially Great Whites are evil creatures with malice intentions when attacks do occur; but, on the contrary that is wrong. Sharks are not the only beautiful and unique creatures in the ocean, they also play a vital role in our ecosystem; however, due to human interference they might
How shark-skin denticles inspired the construction of antibacterial surfaces; how jellyfish tentacles influenced the design of a technique for snagging rare cancer cells circulating in the bloodstream; how mussel proteins that harden underwater to attach the mollusks to rocks can serve as an effective surgical glue; If I could reveal anything that is hidden from us, at least in modern cultures, it would be to reveal something that we've forgotten, that we used to know as well as we knew our own
the famous 1975 Spielberg movie Jaws, which portrays the chaos that sharks can cause. From then until now, movies that showcase the ever-violent personalities of sharks have been popular in the media. They are seen as the face of oceanic brutality, whether they bite off people’s arms or cause turbulence in beach parties. Little does the world know about the dangers that we, humans, do to these natural predators of the oceans. Sharks have been on this earth for nearly 450 billion years. To put that
Savagely cutting off a human’s arm is totally immoral, and yet fishermen continue to cut off sharks’ fins and leave them for dead. Shark finning is practiced by numerous countries, but only banned by a few. While it is well known that this barbarian and horrifying practice is severely endangering most shark populations there are only a few laws in a few places that regulate the shark fin trade. The reason shark finning continues to go on is due to the high market demand, weak legal constraints, and the
mind when you think of sharks? Sharks make people think of death and fear. As you will be able to see after i discuss types of sharks, their habitat,the food they eat, and their intelligence. They don't seem as bad as you think so. First sharks live a habitat under the water in the sea. Sharks live in many different oceans. They live in the the pacific ocean, Atlantic, Indian,and the Arctic. Mostly all sharks live in salty water, but some sharks live in the river. Sharks live in coral reefs under