Shark’s Electroreception
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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Sea Shepherd
Sea Shepherd is best known for its frontline work protecting marine mammals but its broader mandate is to protect all ocean creatures. Styled on the more widely publicized organization Greenpeace, Sea Shepherd continued to grow teeth where Greenpeace lost them through inactivity. Sea Shepherd’s founder Captain Paul Watson has a reputation for pursuing illegal whalers and longliners, harassing seal cullers, organizing rallies, and generally irritating governments that would rather turn a blind eye, and infuriating fishing consortiums who would rather go about their illegal and often cruel practices unnoticed.
Sea Shepherd’s flag ship The Farley Mowat has harassed shark fishing boats in Costa Rican waters and sent sailors sprawling over their decks after being hit by The Marley Mowat’s water cannons.
Captain Watson also manages to fit a lecture circuit into his busy schedule, during which he educates anyone willing to listen on the plight of whales, dolphins, seals, and sharks.
Sea Shepherd’s second vessel is on permanent patrol in the Galapagos area where Park Rangers are virtually helpless against the Ecuadorian fishing boats that brazenly ignore the protection afforded to the park by its world heritage site status. Even with Sea Shepherd’s vigilant patrols the rangers are so out numbered that fishermen have an almost unimpeded run of the islands and the Galapagos Sharks that once schooled in vast numbers around Darwin Island have all but vanished.
This kind of hard line activism is not for everyone. The Sea Shepherd crew have been deported, locked up, threatened, and roughed up on many occasions. Violent confrontations at sea may not fit with your particular code of behavior or ethics but what makes you more uncomfortable: sponsoring Sea Shepherd’s activities that achieve direct results in the protection of endangered creatures, or lobbying deaf government officials while the wholesale slaughter of our oceans sharks and whales continues unchallenged?
If Sea Shepherd seems like a worthwhile organization with which to take a stand, you can help them in a variety of ways. Joining Sea Shepherd with a modest contribution, helps with the provisioning, fueling, and maintenance of their ships. As a member you may also have the chance to sign on as a volunteer for a tour of duty on one of their campaigns. On their website they list what skills they are looking for in new crew members but they also take unskilled deckhands that are willing to work hard.
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The Shark Safe Network
The Shark Safe Network provides a framework to combine and focus the efforts of committed individuals and shark conservation groups towards specific shark conservation campaigns. If you have a passion to protect sharks, Shark Safe Network helps you to get involved and make a difference – by participating in a current campaign or by launching your own campaign in your community.
Shark Safe Network provides the information, tools, raw materials and support. You provide the passion!!
The goal of every Shark Safe Network campaign is to reduce and ultimately eliminate wasteful and unsustainable activities and products that threaten sharks’ survival. Shark Safe Network invites and welcomes participation from any and all organizations and individuals, provided that all campaigns are conducted according the Shark Safe Network campaign principles.
And we always keep in mind that helping sharks = helping people. When you consider any of the issues that threaten sharks today, there is also a corresponding negative impact on humans and the planet.
Shark Safe Network is all about getting involved and doing something that counts. Join the Shark Safe Network and you will make a difference!
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Shark Existence
The shark existence of the east coast of the USA decreased in the last 15 years substantially. The number of the hammerhead sharks sank around 89%, those of the thresher sharks around 80%, those of the great white sharks around 79%. The populations of the mako sharks, blue sharks and tiger sharks sank around 40-65%. The existence of the sandbar sharks were reduced in the last 10 years by overfishing by 85-90%.
Canadian researchers announce a decrease of the oceanic whitetip shark by around 99%. They are almost extinguished in certain regions already.
Sharks are not only caught actively for their meat, fins or cartilages. Millions of sharks die as non-usable catch (bycatch) in the nets and longlines of the swimming fish factories.
In the year 1991 the longline fishery brought in 8.3 million sharks world-wide. It is assumed that about half of it were blue sharks. More than 87% of these 8.3 million sharks were thrown away!
In the USA, along the Atlantic Coast and the Gulf of Mexico, annually approx. 2.5 million sharks are fished by sportfishing (game fishing). From that approx. 20-40% (500’000 – 1’000’000 sharks) got killed.
The population of all sorts of sharks is worldwide extremely threatened. In total 82 shark and ray species are registered on the so called “Red List” of the World Conservation Union.
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Shark Finning
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Finning is called as the cruel cutting off the fins of the sharks. Often the sharks are still alive at this time. The trunk of the shark (dead or alive) is then thrown as redundant ballast over board. The shark fins constitute only approx. 14% of the total weight of a shark but bring in on the international market substantially more than shark meat. The fins are used exclusively for shark fish fin soup. Finning is cruelly however lucrative; for a kilo of shark fins in Asia an average over 100 US Dollar is paid.
Hong Kong and the mainland China dominate the world-wide shark fin market to 50%. Statistics from Taiwan, Singapore and Hong Kong point a growth like an explosion of the trade with shark fins. Already 1999 according to official data of the customs authorities of Hong Kong 6954 tons of shark fins were released for the re-export. The number of exported fins might have increased by a multiple since then. They predominantly go to Taiwan, Singapore, Malaysia, Korea and China. Taiwan ranks at place five in the world-wide shark fin trade. It maintains the world-wide largest fishing fleet, which fishes primarily in international waters, far away from the own territorial waters. |
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