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.
Filed under Sharks Knowledges · Tagged with amp, Ampullae, angel, animal, animal movements, brain, cannot, car, care, cent, Co, concentration, course, creature, diver, dog, dogs cats, Don, electric signals, electrical field, electrical signals, EST, field, fin, fish, gel, gene, goldfish, Got, Great, head, kind, kind of fish, Lorenzini, mean, metal, movement, need, nerve, nerve endings, object, organs, place, potential, prey, protect, range, rat, rate, ratio, Red, rest, round, sea, sea world, seawater, sense, sensing devices, shark, Sharks, signal, sixth sense, snouts, special needs, Strangely, time, tiny electrical impulses, US, use, water, way, With, world, Your
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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).
saving loans at payday advance service
Filed under Sharks Knowledges · Tagged with advance, age, air, anal, anal fins, animal, baby, baby sharks, bite, bladder, blood, body, bone, bony, bony fish, bony fishes, car, cartilage, cent, centre, Chondrichthyes, Class, cloaca, Co, column, day, Denticles, dentine, ear, elasmobranch, ename, enamel, entrance, exception, face, feed, feeding, field, fin, fins, fish, fish larvae, fish release, food, form, friction, front, gas, gill, gill slits, incubate, inner surface, jaw, larvae, liver, loan, lot, lower jaw, Male, Mammals, mix, need, object, oil, old teeth, order, organs, oxygen, pair, paper, part, payday, pectoral, pectoral fins, place, position, rat, ray, Red, reef, reef sharks, release, round, row, sack, sand, sandpaper, Sandtiger, sandtiger shark, sea, sense, serv, service, shape, shark, Sharks, side, skate, skates, skin, skull, sperm, surface, swim bladder, swimming, tiger, tiger shark, tight circles, tiny fish, turbid, upper jaw, US, use, uterus, uteruses, water, water column, With
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:
-
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;
-
To manage and disburse such funds in the furtherance of the objectives of the Trust;
-
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);
-
To assist in providing relevant advice on the management of the Great White Sharks (Carcharodon carcharias);
-
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;
-
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;
-
To ensure that effective action is taken in all matters affecting the welfare and preservation of the Great White Sharks (Carcharodon carcharias);
-
To promote educational opportunities for the general public, schools and the tourism industry;
-
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.
Filed under Sharks Organizations · Tagged with action, advice, african organizations, age, brain, brain child, car, Carcharodon, cent, child, Co, concentration, Concern, connection, conservation, conservation education, conservation projects, dialogue, disburse, Don, Dye, Dyer Island, ear, edition, education, effect, effective action, effort, Endangered, Ensure, environment, EST, False Bay, field, field expeditions, fit, founder, fund, furtherance, Gansbaai, gene, general, goal, Government, government bodies, Great, great white shark, great white sharks, importance, industry, International, international sources, Join, Joint, land, management, management research, Marine, marine environment, matter, Michael Scholl, mind, Mossel Bay, need, non-profit organization, object, order, organization, part, preservation, project, protect, protection, public, purpose, rat, ratio, Red, relevant advice, Republic, republic of south africa, research, research education, reservation, role, round, sea, serv, shark, shark trust, Sharks, side, source, South Africa, stand, support, tour, tourism, tourism industry, Trust, trustee, US, welfare, White, white shark, White Shark Trust, white sharks, With, work
Following its acceptance of membership to the recently formed Shark Alliance, Save Our Sharks (SOS) attended the first anniversary and inaugural meeting of the Shark Alliance member groups in Brussels.
Around 35 delegates from 6 countries, U.K, France, Italy, Germany, Switzerland and Holland attended plus the directors and staff from the Pew Charitable Trusts, who financed the meeting.
Save Our Sharks were represented by Nigel Proctor (on behalf of the SOS committee) who met up at Brussels airport with the Sea Anglers Conservation Network (Scotland) representative, and SOS liaison officer Denis Kelly.
“Fins On”
One of the principal proposals that came out the conference is to be headed “Fins On” where the aim is to have sharks landed whole. There will be a drive to raise public awareness of the issue, and we will try to capitalise on the IUCN red listing, and create further publicity.
“Shark Week”
Another proposal is to hold a “Shark Week” in each member country, where each country’s members create a project to involve the community, schools, museums, aquariums and the like to raise awareness of shark issues.
There will be more to follow on the above shortly
There were many other issues and points made, however, these are the principal ones
• Strive to raise public awareness of shark related issues,
• Create adequate publicity and maintain the pressure,
• Educate journalists away from ‘sensationalism’ without portraying sharks as an animal they clearly are not, they are apex predators, not cuddly, loveable ‘toys’,
• Pre-influence the journalist way of thinking prior to ‘shark week’ and Ocean Day,
• Feed the media with facts and data to ‘force’ the attention on sharks prior to EU discussions on shark management,
• Similarly with CITES,
• Important to maintain ‘shark friendly’ states and get them to lobby less friendly countries,
• Lobby the UK to dispense with its ‘special permits’,
• Ensure that the Shark Alliance has a high profile at the release and showing of the new shark film,
• Don’t alienate the fishing industry,
• Work with fishermen, more is likely to be achieved at a faster rate,
Denis and Nigel were made extremely welcome and clearly treated as being amongst equals, if but a little less experienced in the ways of policy and lobbying. Nigel stated after the meeting that, “We have made significant moves along the pathway of shark conservation and have little to fear in the future, in terms of acceptability, we have a lot to offer and should not be afraid to push forward with our objectives, we can gain a great deal from liaison with the other member groups of the Shark Alliance, however, we also have a great deal to offer as well”.
At the conference Nigel reiterated the high level of importance UK anglers attached to sharks, skates and rays, making the point that the bad old days of trophy fish were long gone. He finished off by indicating our commitment and referencing the prohibition on the landing of tope along the English east coast (c 200 miles of coastline) which to the best of our knowledge is the first full protection, and or prohibition on the landing of any shark species in European waters. This brought about a warm and consensual round of applause, which probably indicates that we are not outcasts any more, but highly regarded and welcome members of an important Shark Alliance.
Well done to Nigel and Denis for helping to put recreational shark fishing on the front-line of European shark conservation
The next few months
We are in for a quiet time in Scotland until after the elections but there is much to do, in England and Europe. We will be writing to our members shortly with more details, please get involved.
• Liaise with the Shark Trust to organise a “Shark Week” to raise public awareness with the overall goal of banning the removing of fins at sea.
• Lobby Defra to stop handing out special permits which allows finning on Porbeagles. Both of the above are part of the “Fins On” campaign.
• Keep pressure on Defra to announce the results of the tope consultation.
• Build up a case to take to the EU to implement tope management across Europe.
• Remind Defra of their intention to implement a maximum landing size on rays, skate and spurdog.
• Keep pressure on the Scottish Exec. to have the Firth of Lorne, Sound of Mull and surrounding lochs and waters designated as a Spurdog nursery area.
• Lobby the EU to have the 25 per cent by catch on rays implemented in all UK waters.
• Continue with the red tape to get SOS listed for charitable status. Once achieved we can apply for grants to help with the campaigning and administrative costs.
Filed under Save Sharks · Tagged with ability, acceptability, acceptance, age, aim, air, airport, Alliance, alliance member, amp, Anglers, animal, anniversary, apex, apex predators, applause, aquariums, area, attention, awareness, ban, behalf, Brussels, brussels airport, Build, campaign, campaigning, capitalise, case, catch, cent, CITES, Co, coast, coastline, commitment, committee, community, conference, conference in Brussels, consensual, conservation, conservation network, consultation, Continue, country, Data, day, deal, Defra, Denis, Denis Kelly, Director, dog, Don, drive, ear, Educate, England, English, Ensure, EST, Europe, European, european waters, Exec, experience, fact, fear, feed, film, fin, Finning, fins, Firth, fish, fishermen, fishing, force, form, France, front, future, gel, Germany, germany switzerland, Gland, goal, Great, group, half, hand, head, hold, Holland, importance, Important, inaugural meeting, industry, influence, intention, International, issue, Italy, IUCN, iucn red list, journal, journalist, knowledge, land, landing, leg, level, Liaise, liaison, liaison officer, line, List, listing, Lobby, Lorne, lot, management, maximum, meeting, member, member country, member groups, membership, mind, Mull, Network, network scotland, Nigel, Nigel Proctor, nursery, object, ocean, offer, officer, organise, part, pathway, Pew, pew charitable trusts, point, policy, porbeagle, Porbeagles, Pre-influence, predators, pressure, Principal, principal proposals, proctor, profile, prohibition, project, proposal, protect, protection, public, public awareness, publicity, rat, rate, ray, recreation, Red, release, Remind, representative, round, Save, Scotland, Scottish, sea, sea anglers, sensationalism, serv, shark, Shark Alliance, shark conservation, shark fish, shark fishing, shark species, shark trust, shark week, Sharks, ship, showing, size, skate, skates, SOS, Sound, Species, spurdog, staff, status, Strive, Switzerland, tape, term, The Shark Trust, time, tope, trophy, Trust, Trusts, U.K, UK, uk waters, US, use, water, way, Week, With, work
