Speaking of sharks we can imagine something of fear, but there are species that are not dangerous and do not imagine that you could call sharks. This species of fish is relatively peaceful but can become direct pursuers other tank mates if you do not like much. The red fin shark is a close cousin of the red-tailed black shark, and also comes from Asia.
The body shape is much the same, except that this species is slightly thinner than its cousin. This fish grows to about 15 cm and requires the same care and the same feed as the red-tailed black shark. Your body usually silver and stand in aquariums that are usually very active so you should make sure the aquarium has a fairly broad measures.
The water temperature should be about 24 ° C so that they are comfortable. Your diet should be varied and can enchant it live foods such as earthworms. The red-tailed black sharks in Thailand are probably the most popular species. Are best kept in small banks and prefer the hot water of about 25.5 ° C.
They can eat dry food and live. It can grow to around 18 cm. Another species of shark is the “angel”. Angel sharks usually are not violent by nature, as such, only attack when caught or endangered. These sharks inhabit the ocean floors. Another species is the basking shark is also known as Sunfish, since it spends most of its time on the surface for sunlight.
MYTHS ABOUT SHARKS
Most people consider the sharks as ruthless murderers ocean with it’s best not to run, and will not hesitate to devour. The cinema and literature have helped perpetuate this and other myths that grow around these animals, but we can be frightening, are certainly fascinating. These are the myths about sharks that have taken root among us:
Almost all shark species that are hazardous to humans: Nothing is further from reality, and to confirm just take a look at the numbers. There are over 350 species of sharks and over 80% of them are completely harmless to humans and rarely approach humans. In fact, the only species classified as dangerous the great white, bull shark and the Mako shark, oceanic whitetip with.
Sharks go crazy when they smell human blood: Contrary to what the movies have given us, sharks do not seem to favor any particular blood.
The Great White Shark inhabits beaches frequented by humans: The beaches where we usually have most enjoyed the warm waters, while this shark species prefer cold waters, so it is not usually found in waters frequented by humans, except in some regions.
Sharks have to swim constantly to stay alive: This is only true for some species, but others may sit quietly on the ocean floor, pushing blood through their gills to breathe, instead of swimming for passing water therethrough.
THE KILLER OF THE SEAS: JAWS (PART 1)
The surface of our planet is covered for 70% of the oceans, within which live more than 20 000 known species of fish and an unlimited amount of other forms of marine life. Of all these creatures are only 370 species at the top of the food chain and are just sharks.
They are known as hunters and killers without borders cruel creatures so dangerous to meet only through crates for protection. There are 30 known species of sharks that attack humans, so our reaction is not surprising confused between admiration and fear.
Some of these sharks live on the seabed in others areas of the ocean surface. But all are necessary to maintain the delicate balance of ocean ecosystems as constantly eliminate the weak or injured animals. A shark is able to detect a single molecule of blood from millions of watermolecules.
Each of the senses Shark works with the precision of a perfectly calibrated alarm system: well-developed internal ears allow the shark to perceive the sounds up to a distance of about one mile.
The sound on the other hand, it spreads better and greater distance in water than in air. Some experiments have shown that some species are more sensitive to low frequency sounds: irregular vibrations with frequencies equal to or greater than 40 Hz cause a kind of frenzy. The fact is not surprising, in fact, is the same frequency emitted by a wounded fish.
Sharks have the ability, like dogs, to detect an odor moving back and forth to follow the track is able to detect a small vibration produced by the movements of a fish struggling even at a distance of 90 meters. These vibrations are picked up by channels filled with highly sensitive liquid called lateral lines that run beneath the skin. These channels are coated with thin hair-like receptors are prepared for receiving the vibrations produced by prey wound. At about 30 meters, the hunter is already able to point his victim.
THE KILLER OF THE SEAS: JAWS (PART 2)
Depending on where they live changes the size and shape of the eyes of the shark: sharks that feed in shallow water usually have smaller eyes as there is more light, while the sharks living in deep water tend to have big eyes.
A peculiarity of some sharks is the “membrane nictitating” that closes to protect the eye, when the shark bites the victim. A shark, a distance of about 2 meters, is able to identify the victim even if it is hidden from view: this is thanks to a sensory organ known as the ampullae of Lorenzini.
These bags, filled with a kind of jelly and connected through the pores on the face and head, can not only detect electric fields but also the direction from which they come. These electric fields can be issued either by a small wound from an animal hidden in the sand. Each of its senses is able to lead and when prey are in operation all together the result is fatal.
The teeth and jaws of sharks are fearsome weapons. Some of them can push the jaw and grasping the prey in a single motion. The shark’s teeth are different in both form and function for which they serve as the food source.
For example, teeth clenched and hook tiger shark are very efficient tools for slicing and tearing. Or even the Greenland shark teeth are so sharp that were used by Eskimos as tools for cutting hair.
Sharks lose teeth constantly throughout their lives. To replace some of them have up to 15 rows of teeth folded back into the fabric of the jaws. Some species of sharks lose and replace teeth every year until 6000. Scientists are always interested in the force that develops in a shark bite. The records of the experiments is 3500 pounds per square inch.
THE KILLER OF THE SEAS: JAWS (PART 3)
The biggest fish of the sea is also the kindest among sharks: whale shark can reach a length of 15 meters and a weight of 20 tons, but is nourished by the smaller creatures that exist in the sea. Precisely for this reason are called filters eaters and their hunting takes place in this way: fill your mouth with water that is filtered through their gills at a rate of about 800,000 liters per hour pulling out small organisms (plankton ) along with tiny fish and shrimp.
Concerning reproduction, the mechanism of sharks remains an unknown. Sharks need 15 to 20 years to reach full sexual maturity. The courtship is apparently violent. Strangely, there are episodes of cooperation between males and a female block biting on pectoral fins. One of the two then goes away and the female signals its willingness to mate with each other.
A curiosity about: sometimes a female mates so many times is forced to eject sperm because his body is full. A bit ‘disgusting, huh? Finally, we try to understand something more about the mechanics of swimming. The fish are back, sharks are not able to do so because their pectoral fins are not flexible.
In addition, sharks also have teeth skin teeth skin or rearward facing to facilitate the flow of waterin the body and reduce friction thereby increasing the speed. In any case, the queue to control the speed and the hammerhead shark is one of the most powerful swimmers.
Although sharks are no skeletal structure, however heavier sea water and are forced to swim not sink. The fish with skeletal structure have forfeited that air bladders, so they can float.
Sharks, however, rely on their highly developed liver contains up to 70 liters of a type of oil lighter than sea water, which together with the fins, helps them to float. The only shark that also helps with the air for more flotation is the sand tiger shark that swallows to give greater vertical thrust.