bnn.lv Latviski   bnn-news.com English   bnn-news.ru По-русски
Sunday 26.03.2017 | Name days: Eiženija, Ženija

Surprising facts about sharks you may not have known before

FaceBook
Twitter
Draugiem
print
(No Ratings Yet)

Baltic news, News from Latvia, BNN.LV, BNN-NEWS.COM, BNN-NEWS.RUTerrifying giant jaws, intimidating look and razor-sharp teeth. Sharks are predators that inspire fear. Year after year thousands of people are killed by sharks. Regardless, these fascinating creatures are unique in their behaviour and variety. Scientists spend years studying sharks, and every time we learn something new about them.

Here are ten surprising facts about sharks provided by National Geographic:

An average shark loses up to 30,000 teeth throughout its life

Usually sharks have 45 to 50 teeth, but those are only in the front row. Behind it, there are can be up to seven rows of teeth that can be put to use in an instant if teeth in the front row are damaged or lost. Some shark species constantly replace teeth throughout their lives – they can replace up to 30,000 teeth in a span of the whole life. There are sharks whose teeth are replaced every 8 – 10 days.

Some species of shark have no need for teeth

Even though sharks are usually associated with big and sharp teeth, some shark species really have no need for teeth. The whale shark and basking share – two of the largest species of shark – feed passively, by filtering half-decomposed remains of organisms and micro-organisms from water. They do have a lot of small teeth. For example, the whale shark can have up to 300 rows of teeth.

Sharks have a special body language

White sharks do not use sound to communicate. They use body language instead. Bent back, lowered pectoral fins, sharp zigzag movements and sudden movements backwards and forwards – all of these are powerful indicators that show a shark is anxious about something.

Shark lifespan varies from species to species

Some of the largest sharks in the world have longer lives than their smaller counterparts. For example, the whale shark, which can be 5.5 – 10 m in length, can live up to 100 years. The smooth lantern shark – which is 0.6 – 1.2 m in length – lives on average for 16 years.

Sharks vary in size dramatically

The whale shark is not only the largest shark, but also the largest fish in the world. The smallest sharks in the world are dwarf sharks – on average their length is only 17 cm.

Sharks have three different ways of reproduction

Approximately 30% of sharks lay eggs. Some sharks are viviparous. Most sharks carry eggs in a special egg chamber – Fallopian tube – which is filled with special secretions. The baby shark develops in that chamber until it is ready to be born. A single female shark can carry up to 48 offspring.

Sharks are a protected species

Statistics show that for every one shark that kills one human, 25 million sharks are killed by humans. This is mainly done to acquire shark fins, which are considered a delicacy in many parts of the world. More than 200 species of shark are included in the Red Book of Protected Species. Sharks are an important part of the oceanic ecosystem. This is why their dwindling numbers seriously worry ecologists. If sharks die out, the oceans of the world will soon follow.

Sharks can see yellow colour – a myth

Shark studies have helped disprove the myth that sharks are attracted by yellow colour. In truth, sharks cannot see any colours. Research has shown that sharks do not have eye cells that differentiate between different colours. They can differentiate between contrasts of colours, but not colours themselves.

Sharks inhabit freshwater environments as well

Sharks inhabit all seven of the world’s oceans. However, some sharks do inhabit freshwater environments. There are sharks that inhabit mixed environments, like estuaries and bodies of water connected to the ocean. Other species of shark feel absolutely fine in fresh water.

Sharks have been around for 400 million years

Sharks have been present on Earth since the age of dinosaurs. Scientists have found remains of 400-million-year old fossilized teeth and scales that may have belonged to ancestors of modern sharks. The so-called modern sharks first appeared around 100 million years ago. A rare species of shark is said to still inhabit the Earth. Apparently, it has not changed much over the past several million years. It is the so-called frilled shark – one of the best examples we have to imagine how ancient sharks might have looked like.

Ref: 102.109.109.6702


Leave a reply

Week in Lithuania. Foreign minister dismisses Lukashenko's accusations as fiction

Lithuania's Foreign Minister Linas Linkevičius has dismissed the statement by Belarusian President Alexander Lukashenko about training of armed provokers in Lithuania as fiction out of the blue.

BNN summary of the week: 5G in Latvia, fight against Lembergs, foreign trade balance deficit

BNN offers a summary of this week’s topical news in a variety of categories: Change; Business; Fight; Decline and Growth.

CC: restoration of trust – way out for cartel participants

This year, Competition Council provided positive conclusion in regards to recovery of trust to two companies previously punished for cartel agreement.

Kristovskis: coalition with Lembergs in Ventspils City Council is not possible

«If the party’s list enters the city council, our candidates will definitely not work with Lembergs,» said Girts Valdis Kristovskis in an interview to Latvijas Radio.

Sadales tīkls: energy industry enjoys stable growth in Baltics

Although the company does not experience the lack of quality labour force, when announcing vacancies it becomes clear that population density in regions continues to decline, and this makes it harder to find young specialists for work in regions, said Andis Pinkulis, CEO of Sadales tīkls, in an interview to BNN.

Airline Nordica not to ban tablets and lap-tops from being brought on passenger cabin

Estonia’s national airline Nordica has stated it would not follow the recent U.S. and British ban on such computer devices as tablets and lap-tops from being brought onto passenger cabin on flights.

Rinkevics invites Canadian companies to use Latvia’s transit and logistics infrastructure

«We’re hoping for more intensive economic cooperation and diversification of exports of Latvian goods, as well as attraction of investments from Canada. Canadian investors are awaited in Latvia,» says Latvian Foreign Affairs Minister Edgars Rinkevics.

Rimsevics: tax changes may increase lending volumes in Latvia

Lending volumes in Latvia may increase because of changes to the country’s tax system, says governor of the Bank of Latvia Ilmars Rimsevics.

Latvian authorities deport 19 Vietnamese citizens

19 Vietnamese citizens caught trying to cross the border of the Republic of Latvia last year have been deported from the country.

Latvia’s export and import volume was the lowest in January

Latvia’s export and import volume this January was below what was noted in Lithuania and Estonia. The largest foreign trade balance deficit among Baltic States was noted in Estonia.

Lithuanian population continues to shrink, some glint may be ahead

The shrinkage of Lithuanian population is nowhere close to a halt. In fact, the recent numbers by the Lithuanian Statistics and Eurostat, the European Union‘s statistics agency, purport the opposite: exodus has picked up last year - 50,000 Lithuanian citizens left the country for a better life abroad, up from 44,500 in the previous year.

Over 200 people could have died in Mediterranean

It is assumed that over 200 migrants might have drowned this week in the Mediterranean, off the coast of Libya, a Spanish humanitarian aid organisation feared.

Proportion of HIV-infected tuberculosis patients in Latvia is 17.4% - the highest in EU

The proportion of HIV-infected tuberculosis patients in Latvia is 17.4%, which is the highest not only among Baltic States, but also Europe, as mentioned by Jurijs Perescikovs, director of Disease Prevention and Control Centre’s Infection Risk Analysis Department in a discussion dedicated to the World Tuberculosis Day.

British police names London terrorist

British police has stated that the March 22 terror attack in London was committed by British-born Khalid Masood. Another of his victims has died.

Air temperature in Latvia to remain largely unchanged in coming days

On Friday, 24 March, high atmospheric pressure will remain in the country. Because of that, some clouds will be seen in the sky, wind speed will stay moderate, and air temperature will rise to +3° C…+8° C, as reported by the State Environmental, Geology and Meteorology Centre.

Kucinskis hopes to find a new director for State Chancellery within two weeks

Latvian Prime Minister Maris Kucinskis hopes to find a new manager for the State Chancellery within the next two weeks.

InnoEnergy business opens an office in Latvia

International business accelerator company InnoEnergy has opened an office in Latvia. This objective of this company is preparing new and innovative technologies developers for attraction of investments as part of InnoEnergy accelerator.

Bank of Latvia increases inflation outlook for 2017 to 2.7%

The Bank of Latvia has increased its inflation outlook for 2017 from 1.6% to 2.7%, as reported by the bank’s press-service.

CC permits Lithuanian company to acquire decisive influence over Latvian businesses

Latvia’s Competition Council has permitted two mutually associated deals to be performed by W.P.Carey and Kesko, allowing the two concerns to acquire decisive influence over Lithuanian Baltic Retail Properties and three companies registered in Latvia – K Prof, Polo LS and Daugavkrasts M.

Estonian military transport firm co-operates with leading Norwegian and British companies

Estonian military transport manufacturer Milrem has made a joint product with Norwegian weapon-maker Kongsberg and British remote system producer Qinetiq North America.

Welfare Ministry opposes diverting part of social budget to healthcare

Experts view Finance Ministry’s proposal to divert certain parts of the social budget to pay for certain healthcare services. Welfare Ministry is especially cautious about this proposal.

Saeima agrees to publish names of disciplinary punished judges

Publication of information about disciplinary penalties applied to judges, their names and surnames will no longer be prohibited, as stated by amendments to the Judicial Disciplinary Liability Law supported by the Saeima in the first reading on Thursday, 23 March.

Experts: internet users open up 30% of fraudulent e-mail letters

Cyber criminals are becoming more and more cunning and their fraudulent e-mails – harder and harder to differentiate from real ones. Internet users open up to 30% of fraudulent e-mail letters, explains eScan antivirus developers.

Minister: Latvia supports International Coalition’s fight against Daesh

«The fight of the International Coalition against Daesh has become a very effective instrument to help reduce Daesh military, financial and recruitment capabilities,» said Latvian Foreign Affairs Minister Edgars Rinkevics.

New pulp factory planned in Estonia

Estonian entrepreneurs have envisaged building a high-tech pulp-making plant near the city of Tartu and have submitted the plan for confirmation from Estonian national special planning authorities.