Like many fish sharks also have another sense, a sixth sense, which we don’t know much about. They are able to detect tiny electrical impulses in the water. As all animals produce some electrical signals this can be very useful! They can detect movement in the water from hundreds of meters away. They can pick up electrical signals generated by their prey, making it possible to feel other animal movements.
This sixth sense is made possible thanks to electro-receptive organs called Ampullae of Lorenzini. These were discovered only recently. The Ampullae are jelly-filled pores. These pores are located all around their heads with a greater concentration around their snouts and are connected to the brain through nerve endings. Basically, these ampullae are electrical field-sensing devices. Every living creature produces an electrical field which sharks can detect.
Strangely enough, a shark will sometimes attack a metal object. This is because, in salty seawater, metal gives off electric signals, which confuse the shark into thinking it is prey. This means a shark cannot only detect its prey but a diver or potential hunters without seeing them.
Shark is a kind of fish that is protected. You can find them on places like sea world. They take care sharks, of course unlike birds, dogs, cats or goldfish, sharks have special needs. Got interested with shark and other fish? Well you should, because fish are fantastic animals and you can have them as your pets.
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Sharks and rays do not have true bones like other fishes. They have cartilage instead which is lighter and much more elastic and allows them to bend in very tight circles.
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Sharks do not have swim bladders. A swim bladder is a gas filled sack inside the body of bony fishes that allows them to stay still without sinking. Sharks compensate by having a very big liver that is filled with oil. Even so, sharks sink unless they keep swimming forward. The exception is the Sandtiger Shark which swallows air to make itself more buoyant.
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A shark’s upper jaw is not fused to its skull like most animals. When a shark bites a large object, it is able to move its upper and lower jaw forward in order to take a bigger bite.
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Unlike other fishes, sharks are able to replace their teeth constantly. New teeth grow from the inner surface of the jaw and rotate forward when the old teeth get worn out or lost during feeding.
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Sharks and rays do not reproduce like other fishes. Most fish release clouds of sperm and eggs into the water column where they mix together. The fertilized eggs then float around until the fish larvae hatch and form schools of tiny fish. Male sharks have two organs called claspers attached to their anal fins. They insert one of these into the female shark’s cloaca (the entrance to the uterus) to transfer sperm (just like in mammals). Some sharks and rays incubate the eggs in their uteruses until the baby sharks are ready to be born. Other sharks and rays (i.e. skates) lay eggs and attach them to the reef.
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Sharks have between 5 and 7 gill slits on each side of their body in front of their pectoral fins. Bony fishes only have one pair. Having many exposed gill slits probably helps transfer more oxygen into their blood faster which allows them to swim very fast when they need to.
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Most shark’s skin is covered in small denticles instead of scales. Denticles are a lot like teeth. They have dentine in the centre and enamel on the surface. This makes shark’s skin very tough and abrasive like sandpaper. The shape and position of some shark’s denticles also helps reduce friction so that they can slip through the water easier.
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Sharks have an extra sense that is able to detect tiny electric fields. They can use this to find food that is buried or to search for animals to eat in the dark or in turbid water.
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Sharks and rays make up the sub-class of fishes called elasmobranches. This sub-class is part of a class of cartilaginous fishes called Chondrichthyes which also includes chimaeras (ratfishes).
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The Shark Alliance was formed in 2006 in an attempt to streamline the efforts of NGOs involved in shark conservation. The Alliance is able to utilize the manpower, resources, and combined knowledge of its member organizations to more effectively lobby for sustainable European and global shark fishing limits. Members of the Shark Alliance include The Shark Trust, the European Elasmobranch Association, and The Ocean Concervancy, among others.
In its own words:
The Shark Alliance is a not-for-profit coalition of non-governmental organizations dedicated to restoring and conserving shark populations by improving European fishing policy. Because of the influence of Europe in global fisheries and the importance of sharks in ocean ecosystems, these efforts have the potential to enhance the health of the marine environment in Europe and around the world.
The mission of the Shark Alliance is two-fold: To close loopholes in European policy regarding the wasteful and unsustainable practice of shark finning; To secure responsible, science-based shark fishing limits for long-term sustainability and ecosystem health.
Sharks have evolved over 400 million years and play a critical role in ocean ecosystems. In common with land predators such as lions and wolves, sharks keep other marine populations in check and help maintain the balance of life in the sea. Today, primarily because of overfishing sharks are among the oceans’ most threatened animals. Tens of millions of sharks are killed each year, either intentionally or as bycatch in commercial and recreational fisheries. Ongoing assessment of the status of European sharks (and closely-related rays) by the IUCN (The World Conservation Union) has led to the classification of roughly one third of evaluated species as threatened (either Critically Endangered, Endangered or Vulnerable), with another 16 per cent at risk of becoming so in the near future. Sharks generally grow slowly, mature late and produce few young. Shark populations are therefore especially vulnerable to overexploitation and slow to recover once depleted. The loss of these important predators is predicted to have negative effects on many other species in the sea. Unfortunately, however, misinformation and fear all too often impede the public support required to ensure sharks receive management priority and conservation actions. Unlike many countries that fail to conserve sharks, Europe does not lack the resources to restrict fishing. Despite immediate threats facing sharks there are few European limits on shark fishing, and quotas are routinely set far in excess of actual catches. In 2003, the EU adopted a ban on shark finning (the wasteful practice of slicing off a shark’s fins and discarding the carcass at sea), but at the same time allowed glaring loopholes that render the ban all but meaningless. For instance, shark fishermen are allowed to land shark carcasses and fins separately, making it all but impossible to tell how many sharks have been processed on board and how many were subjected to shark finning. Meanwhile, the fin to carcass ratio (the means of checking that the number of fins corresponds to the number of carcasses – after sea processing – is within the ban’s limits) is the highest and therefore the most lenient in the world. Europe is home to the some of the world’s largest fishing fleets while its powerful fisheries officials exert influence on international fishing restrictions in many regions of the globe. Poor European shark policies, therefore, pose threats not only to shark populations in European waters but also to those around the world. If fisheries are managed carefully, sharks can provide a steady source of food and recreation and help keep the oceans in balance. The Shark Alliance is dedicated to ensuring that these valuable yet vulnerable animals survive and thrive for the benefit of ocean ecosystems and the people that depend on them. Save buying products with payday loan
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The South African based White Shark Trust is “a non-profit organization founded in 2002 to promote and conduct research, education and conservation projects on the endangered Great White Shark”
It is the brain child of Michael Scholl (founder and trustee) who has been conducting research on Great White Sharks since 1997.
The goals of the White Shark Trust are as follows:
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To establish a fund in the Republic of South Africa for the purpose of receiving grants and donations from international sources as well as sources within the Republic of South Africa;
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To manage and disburse such funds in the furtherance of the objectives of the Trust;
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To promote dialogue between various research, conservation, education and Government bodies concerned with management, research, conservation and education concerning the Great White Sharks (Carcharodon carcharias);
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To assist in providing relevant advice on the management of the Great White Sharks (Carcharodon carcharias);
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To obtain the support for the objectives of the White Shark Trust from local residents living around concentration hotspots for the Great White Sharks (Carcharodon carcharias), including Mossel Bay, Dyer Island / Gansbaai and False Bay in particular;
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To obtain the support for the objectives of the Trust from the established tourism industry involved with the Great White Sharks (Carcharodon carcharias) located at Mossel Bay, Dyer Island / Gansbaai and False Bay in particular;
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To ensure that effective action is taken in all matters affecting the welfare and preservation of the Great White Sharks (Carcharodon carcharias);
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To promote educational opportunities for the general public, schools and the tourism industry;
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To conduct and support scientific research projects and field expeditions with regards to the Great White Sharks (Carcharodon carcharias).”
In connection with other like-minded South African organizations, the work of the White Shark Trust is of primary importance in order to better understand the critical role that White Sharks play in balancing the marine environment. Without their joint efforts we are unable to identify the need for better shark protection.
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Over 100 million sharks are killed annually. Partly because of their fins for shark fish fin soup, as bycatch in up to 40 miles long drift nets of enormous fishing fleets, for medically completely ineffective cartilage powder or by the destruction of their habitats.
You will find shark products often at unexpected places as in restaurants, snack bars or supermarkets. Shark meat is offered also under various other names as Smoked Rock Salmon, Smoked Dogfish, a component of Fish & Chips or Imitation Crab Meat (Surimi). Also the worldwide protected and extremely threatened whale shark is on the Asian market (mainly Taiwan and Japan) still offered as Tofu Shark.
Besides the British the Germans consume most spiny dogfish. They produce the so-called “Schillerlocken” out of the sharks belly. The British use the spiny dogfish for “Fish & Chips “. This kind of shark is strongly overfished and its existence in the Northeast Atlantic decreased in the last 40 years by 90 percent.
Principal customers for shark fins are mainly eastern cultures in which shark fin soup represents a cultural meal. It is a remarkable fact that a shark fin, which consists to 90% out of cartilage, is extensively tasteless and only after days of boiling up in a broth becomes soft and gets the taste of the broth. Today shark fin soup is a status symbol because of the strongly risen prices within the last few years.
We can find shark products also in dog fodder, fish flour and even in fertilizers. From shark skin leather products such as purses, shoes or clock bracelets are produced.
Shark liver oil is frequently a component of the well-known cod-liver oil. In the health sector shark cartilage powders is marketed as fit making food additive although shark cartilages contains absolutely no fit making or other wholesome ingredients.
Most problematic is the marketing of shark cartilage as an anti-cancer means. The publication “Cancer Research” published in December 2004 confirms that shark cartilage preparations showed absolutely no effect against cancer.
However in the gel sector (food/pharmacy) shark collagen has few market chances although particularly Spain tries to penetrate into the market with shark collagen. Spain, one of the world largest shark fin producer, has 2002 forbidden to bring only the fins of sharks ashore. According to law the whole shark bodies must be brought now ashore. This leads now ridiculous-proves to the fact that out of the bodies the completely ineffective cartilage powder is made perforce.
In the cosmetics sector from shark cartilage won collagen is used for anti-fold creams and other preparations. Collagen from sharks is free of BSE and more kosher which makes it interesting for the Arab and Israeli markets.
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