- Sharks and rays have a very varied diet. They are carnivores which means that they eat animals rather than plants and algae. Some sharks commonly eat bony fishes, crustaceans (crabs, lobsters, and other animals with an external skeleton), mollusks(snails, sea slugs, octopus and squids), and different types of worms.
- A shark’s diet is often determined by its habitat. For example, sharks that live out at sea (pelagic sharks) are more likely to eatfish and squid because that is all that is available.
- Sometimes sharks change their diet as they get older. The Great White Shark mainly eats fish when it is young but once it reaches maturity it consumes more marine mammals like seals and sea lions.
- Most sharks prefer live food but they will also consume carrion (dead fish and other animals) that they find on the sea floor.
- Just like filter feeding whales, there are a few sharks that live by filtering plankton from the water. The filter feeding sharks may consume phytoplankton (microscopic plants and algae) while hunting for more nourishing zooplankton (tiny animals and larvae that drifts around on the currents). Ironically, the Whale Shark which is the largest fish in the sea, lives on plankton which is one of the smallest animals. So does the second largest fish; the Basking Shark. Although these sharks have huge mouths, their throats are tiny and they are unable to eat anything larger than a grapefruit. Their teeth which are no longer needed for feeding, have become very small.
- The largest ray (the Manta Ray) is also a plankton feeder. It has a flexible projection on each side of its mouth called cephalic lobes that it uses to funnel plankton towards its mouth.
- Most rays eat small fishes and benthic invertebrates; crabs, snails, and worms etc. that live on or under the sand.
- Sometimes its possible to tell what type of food a shark eats by the shape of its teeth. Sharks that catch fast swimming fishes tend to have very pointed teeth that help them grasp the fish. Sharks that eat hard shelled animals have flattened teeth that form a plate to help them crush the creature’s shell like a nutcracker.
- Tiger Sharks have a reputation for eating anything. They have been found with all sorts of strange things in their stomachs from clothes to license plates. Tiger Sharks have very sharp serrated teeth that are strong enough to bite through the shells of marineturtles.
Filed under Sharks Knowledges · Tagged with algae, amp, animal, anything, Basking, basking shark, benthic, bite, bony, bony fish, bony fishes, car, carnivores, carrion, catch, Co, Crab, creature, crush, Determined, diet, drift, eatfish, EST, example, feed, feeder, feeding, filter, fin, fish, fish in the sea, floor, food, form, grapefruit, Great, great white shark, habitat, hunting, largest fish, larvae, license, lobster, lot, Mammals, Manta, manta ray, Marine, marine mammals, maturity, mean, microscopic plants, mollusks, mouth, need, nutcracker, pelagic sharks, phytoplankton, plankton, plankton feeder, plate, point, project, projection, range, rat, rate, ray, reach, reputation, round, sand, sea, sea floor, sea lions, sea slugs, seal, seals and sea lions, shape, shark, Sharks, shell, side, skeleton, skin, small fishes, squid, swimming, term, They are carnivores, thing, tiger, tiger shark, Tiger Sharks, time, tiny animals, turtle, type, US, use, vertebrate, water, Whale, whale shark, what are sharks eat, White, white shark, With, zooplankton
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.
Filed under Sharks Organizations · Tagged with activism, age, amp, anyone, area, behavior, boat, campaign, Captain Paul Watson, Captain Watson, chance, circuit, Co, code, Continue, contribution, Costa Rica, costa rican waters, creature, crew, cruel practices, Darwin Island, duty, Ecuadorian, Educate, Endangered, EST, everyone, eye, Farley, farley mowat, fish, fishermen, fishing, fishing boats, fit, flag, founder, front, frontline, frontline work, frontline work protecting marine mammals, Galapagos, galapagos sharks, gene, general, Government, Greenpeace, hand, heritage, inactivity, Join, kind, land, laugh, lecture, leg, line, List, Lobby, longline, maintenance, Mammals, mandate, Marine, marine mammals, Marley, member, Mowat, number, ocean, ocean creatures, official, organization, Park, park rangers, part, patrol, Paul Watson, plight, practice, protect, protecting marine, protection, public, range, rat, Red, reputation, round, row, run, schedule, sea, Sea Shepherd, seal, shark, shark fish, shark fishing, Sharks, sharks and whales, Shepherd, ship, site, slaughter, stand, status, Styled, tag, threat, Threatened, tour, turn, US, variety, vessel, vigilant, Violent, violent confrontations, vision, volunteer, water, water cannons, way, Web, website, Whale, wholesale slaughter, Wide, With, work, world, world heritage site, Your
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.
Filed under Save Sharks · Tagged with age, amp, Asia, asian, Atlantic, belly, British, broth, BSE, bycatch, Cancer, car, cartilage, cartilage powder, catch, cent, chance, clock, Co, cod liver oil, cod-liver, collagen, component, Crab, customer, day, December, decrease, destruction, dog, Dogfish, drift, drift nets, ear, eastern cultures, effect, EST, existence, fact, fin, fin soup, fins, fish, fish flour, fishing, fishing fleet, fishing fleets, fit, fleet, flour, fodder, food, force, gel, habitat, health, Imitation, imitation crab meat, Japan, kind, kosher, law, leather, liver, liver oil, market, marketing, meal, mean, meat, North, Northeast Atlantic, offer, oil, part, percent, perforce, pharmacy, place, powder, Principal, principal customers, producer, product, protect, public, publication, rat, rate, ratio, Red, research, rest, rise, Rock Salmon, Schillerlocken, sea, sector, shark, shark cartilage, shark fin soup, shark fins, shark fish, shark liver oil, shark meat, Shark Products, Sharks, side, skin, Smoked, snack, snack bars, soup, Spain, spiny, spiny dogfish, status, Surimi, symbol, Taiwan, taste, Tens, threat, Threatened, today, Tofu, US, use, Whale, whale shark, wholesome ingredients, Wide, With, world, world largest shark fin producer, worldwide, year
Sharks have a great deal to fear from humans. Compared to the 10-15 people killed by sharks each year; over 100 million sharks perish at the hands of humans annually and many populations may face extinction. Sharks are killed for many reasons, including fear; food, sport, and ‘machismo’, but the great majority perish due to simple greed. Many shark products have commercial value, including: the flesh; the skin for high-quality leather; teeth and jaws for ornaments; liver oil for cosmetics, medicines, vitamin A, and skin-care products; and cartilage for false cancer ‘cures’. However; the product that drives the market are the fins. After drying, collagen fibers are extracted from them, cleaned, and processed to make ‘shark fin soup’. In spite of the fact that these fibers have little flavor or nutritional value, the soup is considered a delicacy, and may sell in the Orient for more than $100 ( £65) a bowl.
Over the years, shark fisheries have come and gone. In the early part of the century, sponge fishermen in Florida killed sharks to boil them down for their oil. The oil was then thrown on the ocean to smooth the surface of the water and make it easier to see the sponges from the boat. That ended when a plague killed off the sponges. In the 19405 to .19505 a number of shark fisheries sprang up to supply the market for vitamin A. That ended with the discovery of a method for its synthetic production. However; most shark fisheries, such as the one for dogfish sharks to supply the ‘fish and chips’ market in the UK, have ended only when the number of sharks dropped too low for the fishery to be sustained.
The explosive growth of the Chinese economy and rapid expansion of trade with the outside world during the 1985 and 1995 created an unprecedented situation. Suddenly there was an insatiable demand for shark fins of almost any size or type. Improvements in shipbuilding and navigational electronics meant that shark fishing boats could now go anywhere in the world, moving from one place to another as local shark populations were destroyed. The fins are now so much more valuable than the rest of the shark that the carcass is often discarded after the fins are removed, to save storage space on the boat. Often the fins are sliced off when the shark is still alive and the mutilated shark is dumped back into the water to die a slow and agonizing death.
Why should we be concerned about this situation? After all, wouldn’t the ocean be much safer without sharks? The answer is no. The chance of being attacked by a shark is already less than the chance of being struck by lightning. The real dangers for people in the water are drowning, exposure, and being struck by a boat. In the USA, for example, drowning incidents outnumber shark attacks by 1,000 to I. Without sharks, the whole experience of being in a natural ocean wilderness would be immeasurably reduced. It would be like being on the Serengeti with no lions or cheetahs. In losing the opportunity to view these magnificent and superbly-adapted predators in the wild, we are also losing part of our spiritual connection with nature.
But something else would be changed as well -the whole ecology of the ocean. Predators control the populations of their prey species in a beneficial way. They eliminate diseased and genetically defective individuals, and they stabilize population fluctuations. On land, when we have removed the natural predators of deer; for example, their populations have exploded until they overgrazed their food supply and died of starvation and disease. In the ocean we are not sure what all the consequences of removing the apex predators from the food pyramid might be. We do have one example, though. A shark fishery in Tasmania collapsed after two years of over fishing. Shortly afterwards, the fishery for spiny lobsters also collapsed and fishermen observed a lot of octopus in the area. Octopuses are both major predators of spiny lobster and an important food item for sharks. It seems that once the numbers of octopus were no longer controlled by the sharks, they became too numerous and decimated the lobsters. Economically, for those other than shark fishermen, it doesn’t make sense to allow sharks to be fished out, not only because of the possible damage to sustainable fisheries, but also because of the loss of earnings from divers coming to see sharks. Worldwide, shark-watching has become a multi-million dollar business.
Why do shark populations collapse so quickly when people begin fishing them? The answer lies in the life history of these animals. In many aspects, sharks are more similar to mammals such as whales, dolphins, or ourselves, than to other fish. Whereas most fish reach maturity in only a few years and produce thousands or millions of eggs per year; sharks take many years to reach maturity. Some species may not begin to reproduce until they are over 15 years old. Some species produce as few as two pups biannually, averaging only one offspring per year: So when a population is over fished, it may take many years to recover; or it may never recover: Some scientists believe that sharks should never be fished at all, that their biology is too fragile to withstand any exploitation. Perhaps sharks should have the total protection given to marine mammals in many countries. Unfortunately, sharks do not have big ‘fan clubs’ as dolphins do.
Although both are large predators with slow reproductive rates, sharks are handicapped, from a.: public relations perspective, by the fact that their mouths appear to be frowning, and that they must open their mouths to pass water over their gills, exposing their teeth. Dolphins, on the other hand, always appear to be smiling, because of the shape of their mouths. Since they breathe through the blowholes on top of their heads, they do not have to open their mouths and expose their formidable teeth in order to get oxygen. But even the dolphin’s smile may not protect it from the greed inspired by the high prices being offered by international buyers of shark fins. In a number of countries, fishermen are slaughtering dolphins to chop up for shark bait.
We should create save our sharks and dolphins lanyards to create awareness
Filed under Save Sharks · Tagged with A. That, age, amp, animal, answer, apex, apex predators, area, awareness, biology, boat, bowl, BSE, Build, business, Cancer, cancer cures, car, carcass, care, cartilage, cent, century, chance, chinese economy, Co, collagen, collagen fibers, collapse, Concern, connection, control, damage, deal, death, delicacy, demand, discovery, disease, diver, dog, Dogfish, dogfish sharks, Dollar, drive, ear, ecology, Economically, economy, EST, example, expansion, experience, exposure, Extinct, extinction, face, fact, fear, fin, fin soup, fins, fish, fish and chips, fisheries, fishermen, fishery, fishing, fishing boats, flavor, flesh, Florida, food, form, gene, gill, Great, greed, growth, hand, head, history, I. Without, Important, Improvements, insatiable demand, International, item, jaw, jaws, Killing Sharks, land, laugh, leather, life, lightning, liver, liver oil, lobster, loss, lot, machismo, majority, Mammals, Marine, marine mammals, market, maturity, mean, method, mid, mouth, Nature, navigation, navigational, navigational electronics, number, ocean, Octopuses, offer, offspring, oil, opportunity, order, Orient, outnumber, oxygen, part, perish, place, population, predators, prey, process, product, production, protect, protection, public, pyramid, quality leather, rapid expansion, rat, rate, reach, real victims, reason, Red, rest, row, Safe, sand, Save, sea, sense, Serengeti, serv, shape, shark, shark fin soup, shark fins, shark fish, shark fisheries, shark fishing, shark populations, Shark Products, Sharks, ship, shipbuilding, side, situation, size, skin, skin care products, skin-care, slaughter, slice, something, soup, space, Species, spiny, spiritual, spite, sponge, sport, stand, starvation, storage, story, supply, surface, synthetic production, Tasmania, thing, trade, tuna, type, UK, unprecedented situation, US, USA, use, value, vitamin, water, way, Whale, Wide, wilderness, With, world, worldwide, year
