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Scientists Urge Ban Catching Atlantic Shark

Written By Unknown on Friday, March 11, 2011 | 11:21 PM

A number of marine scientists urged the world's ban on catching of eight species of Atlantic Ocean sharks and set strict limits for the arrest of two other species. This is in effort to prevent deterioration of the animal population because the ten species of Atlantic sharks are at serious risk of being overfished.

"Sharks are particularly vulnerable to overfishing because they reproduce and grow slowly, so that now need international limits on shark catch," the insistence of the as reported by the organizations, non-profit Lenfest Ocean Program. The statement is the result of a meeting of shark experts to study the problem of maritime biological life.

Colin Simpfendorfer from James Cook University, Australia, who led a team of scientists said the shark species around the world are experiencing decline. Partly because the species caught on long fishing lines meant to catch tuna and swordfish.

"Our results show very clearly that there is a critical need to take management action to prevent shark population depletion and maintain ecosystem function," he said. Especially when the number of traditional target fish like tuna and swordfish declines, demand for meat and shark fins increases.

Sharks, including animals that have a high cruising so calculate the remaining populations, including difficult. Shark experts from Australia, Belgium, Croatia, South Africa and the United States using available data on shark populations and risk analysis to predict which species face the greatest risk.

"There are plenty of fish in the ocean, but sharks are different because they do not have too many babies every year so that they reproduce much more slowly," said Charlotte Hudson of the Lenfest program. Therefore, when the adult shark killed, with very rapid population will be reduced.

The group recommends ban on shark fishing bideye type thresher, longfin mako, oceanic Whitetip, porbeagle, common thresher, silky, smooth hammerhead, and Crocodile. They urged a strict limit fishing blue and shortfin mako shark. Their advice is addressed to the International Commission for the Conservation of Atlantic Tunas (ICCAT), which will have a meeting in Morocco, 17 to 24 November next. ICCAT mostly manages tuna populations, but environmentalists and scientists see this organization as the only body that can impose broad restrictions on the Atlantic to take sharks in tuna fishing tool.
11:21 PM | 0 komentar | Read More

New Shark Species at the end of 2010

Towards the close of 2010, scientists discovered a new shark species in the Indian Ocean. Mustelus shark species called manglorensis was found at a depth of 500 meters in the waters of western India.

Shark species are identified as gummy shark. According to reports the Indian national newspaper, The Hindu, this species is one of the 19 species found gummy shark in the world.

Shark species are found in the series of the Indian Ocean expedition by a team of researchers from the Cochin University of Science and Technology. Over 10 years of expeditions, research carried out in 220 different locations peraian.

Besides sharks, this study also revealed that India is very rich waters angler fish species variation. Group of fish found in it to trap prey with its jaws, aided by a long ridge that hangs above his head.

Species that have been terdentifikasi during expedition 10 years later has unique characteristics. There is a transparent skin, which can inflate the stomach, and some are having small eyes. The findings, reported Amazing Planet Our site on November 30, 2010.
11:20 PM | 0 komentar | Read More

Whale sharks are the size of Alleged Higher

Whale shark (Rhincodon typus) was recorded  as the largest  fish species present. Researchers reveal, this plankton-eating sharks can reach 20 meters in length. However, who would have thought the size of it could be a wrong measurement. Results of the observations of researchers  from the  University of Queensland, the size of whale sharks  may actually be even greater.

Christoph Rohner conclusion was obtained after analyzing using a camera equipped with a laser. The measurement method is said to be more accurate than the previous. "laser method allows us to get an accurate size of sharks that are moving. Thus, we can know that the biggest shark is bigger than expected," he said.

Typically, measuring the length of the whale shark is only done by the method photogrammetery. With this method, the size is only estimated to be simpler than photo taken. With the laser is placed 50 cm from the camera, the distance projected by the image produced is easier to analyze. Thus, the measurement results can be more accurate.

Rohner expected, precision in the measurement could open possibilities to study the age and development of whale sharks. With this, this species can be conserved. The whale shark is included in the list of animals threatened with extinction by the International Union for Conservation of Nature. Many mysteries of the life of the whale sharks that have not been disclosed.
11:19 PM | 0 komentar | Read More

Apparently Shark Color Blind

Sharks were color blind. Conclusions are drawn based on the results of a study published in the journal Naturwissenschaften scientists on Tuesday (01/18/2011).

To get that conclusion, the researchers conducted observations in the eyes of a shark by using the technique of micro-spectrophotometry. They observe the cells making up the retina of the eye in 17 species of sharks caught in the area of ​​Queensland and Western Australia.

As a result, they found that 10 of the 17 species of sharks do not have a cone-shaped cells, cells that play a role in distinguishing colors. Meanwhile, 7 other species only have 1 type of cone cells, which is kind of sensitive to green color (wavelength of 530 nanometers).

The researchers found that most species of sharks have only rod-shaped cells. These cells are very sensitive to light, able to distinguish contrast and color vision possible. However, the cells were not able to distinguish colors.

"Our results show, compared with the color, contrast with the background may be much more important for the shark to identify the object," said Nathan Scott Hart, the leader of this research project originating from the University of Western Australia.

In an interview with AFP yesterday, he revealed, "This knowledge can help us to design fishing equipment, surfing equipment and swimwear that are less attractive in the eyes of a shark." It can prevent the possibility of humans for prey by the predatory sea.

The ability to distinguish colors is relatively unimportant for marine animals. In the depths of the ocean, the color will fade and disappear. Previously, other researchers also found that dolphins, seals and whales also have only cone cells are sensitive to green color
11:17 PM | 0 komentar | Read More

Shark Fishing Locations further away

The location of shark fishing in Indonesia further away. It was revealed from the results of research conducted with WWF Indonesia TAKA Foundation, an NGO based in Semarang, Central Java. Both institutions are doing research of sharks in 13 locations with a survey method.

Aditya Kusuma Ward from TAKA involved in this observation revealed that the separation location of the catch of sharks can be seen in Bali and Lombok. Formerly in Lombok, to catch sharks in the area just south of Lombok. Now the fishermen get to the border waters of Australia. Meanwhile, fishermen in Bali looking for the shark to the area of ​​Aru Sea. "This indicates that the stock of sharks in the area around the fisherman is already very little," he said.

According to Aditya, Indonesia is the world's largest shark fishing, but not in the top 10 exporters of shark in the world. Based on survey results, he said, it is known that most of the sharks which are caught by catch. This means that sharks are not the main target of the arrest.

Based on observation, 5 types of sharks are frequently caught species Bun Liong (white spot guitarfish), hammerhead shark, blue shark, shark shark monkey and rat. Meanwhile, 5 sharks have high economic value is the lion bun, blue shark, hammerhead shark, shark wild, and brown sharks. Shark fins used as food.

Capture Fisheries Coordinator for WWF's Marine Program Abdullah Habibi said, sharks and rays are fish that are always used but never counted stock. "It is important to conduct a survey of sharks and stock availability in Indonesia. Thus, one would expect if the sharks are safe to eat or not," he said.

WWF and TAKA formulate some recommendations to save sharks. Among these is the need for scientists to find solutions to reduce by catch of 70%. In addition, according to Aditya, trade regulations also required shark products and how to shift the fondness eating shark.
11:16 PM | 0 komentar | Read More
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