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 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
