bnn.lv Latviski   bnn-news.com English   bnn-news.ru По-русски
Wednesday 26.09.2018 | Name days: Kurts, Knuts, Gundars

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

Latvian government to expand Money Laundering Prevention Service’s capacity

On Tuesday, 25 September, Latvian government reached an agreement on the need to reorganize the supervision Cabinet of Ministers has over Money Laundering Prevention Service. At the same time, members of the government also agreed to expand the service’s capacity, Finance Minister Dana Reizniece-Ozola told journalists.

New natural gas tariffs approved in Latvia; those who use more gas will pay less

The Public Utilities Commission has approved AS Gaso’s submitted natural gas transmission system’s tariff project, which provides for the introduction of a fixed fee for connection to permitted load regardless of the consumed gas volume.

OCMA: majority of Latvian immigrants live in Britain, Ireland and Germany

The Office for Citizenship and Migration Affairs has calculated the exact number of Latvian citizens living abroad. The majority of Latvians reside in Britain, followed by Ireland, Germany , and USA, according to the data compiled in July 2018.

Sweden's head of government Löfven loses no-confidence vote

The head of Swedish government, Stefan Löfven has not received the support of parliamentary majority despite his left-wing block narrowly winning the parliamentary election earlier in the month.

CC: number of business merges on a rise in Latvia

In the first eight months of 2018, Competition Council made twelve decisions regarding business merges, which is 50% more than the number of similar decisions made in the same period of last year. Consolidation of market participants takes place the most often in retail trade of household goods, BNN was informed by the council.

EU supervisor to investigate Estonian and Danish banking authorities on Danske Bank

The banking supervisory authority of the European Union has been asked to investigate the work of Denmark and Estonia’s national banking watchdogs over possible shortcomings in failing to prevent money laundering through the Estonia branch of Danske Bank.

airBaltic receives its 12th Airbus A220-300 aircraft

Latvian airBaltic airline has received its twelfth Airbus A220-300 aircraft with registration number YL-CSN. The airline plans to have a total of fourteen Airbus A220-300 aircraft by the end of 2018.

In pictures: Pope Francis arrives in Tallinn

The head of the Roman Catholic church has been welcomed in Tallinn as he begins the last leg of the papal visit to the Baltic states devoted to their centenary.

Meteorologists say first autumn storm in Latvia to take place this week

On Tuesday, 25 September, atmospheric pressure in Latvia will increase and clouds will tend to reduce in the afternoon, as reported by Latvia’s Environment, Geology and Meteorology Centre.

Germany's largest bank required to improve fight against money laundering

The financial watchdog of Germany has called on Deutsche Bank to improve its measures against legalisation of dirty money.

Nearly 20,000 Latvians were living in Ireland in spring 2016

19,933 Latvian citizens were living in Ireland in spring 2016, according to census data from Ireland’s Central Statistical Bureau on the number of foreigners living in the country.

Russian protest leader Navalny detained right after previous detention

Alexei Navalny, a supporter of current protests in Russia against pension reform, has been released from administrative arrest, but arrested again on the same day to be kept in administrative arrest for another 20 days on charges of holding an illegal protest.

CPB: Russian special services remain highly interested about Latvia

Russian special services remain highly interested about Latvia’s internal politics. This includes 13th Saeima elections and their possible results. However, there is currently no information to suggest the election process could be influenced from the outside, admits Constitution Protection Bureau.

PHOTO: Pope Francis visits Riga Cathedral and meets seniors at St Jacob’s Cathedral

Pope Francis visited both Riga Castle and Riga Cathedral, where a service was held under his supervision. There he met with different Latvian officials. After that, the pope met with senior citizens at St Jacob’s cathedral.

Pope Francis arrives in Latvia for an official visit

Pope Francis arrived in Latvia on Monday, 24 September. He was greeted at the airport by President Raimonds Vējonis, Archbishop Zbigņevs Stankevičs and other public figures.

Week in Lithuania. President proposes amendments to restrict bailiffs' remuneration

Lithuanian President Dalia Grybauskaitė is putting forward amendments aimed at restricting bailiffs' financial remuneration to up to 15 per cent of the amount recovered.

BNN summary of the week: pre-election heat, rule of law in Latvia, Baltics prepare for Pope’s visit

BNN offers a summary of this week’s topical news in a variety of categories: Elections; Change; Stagnation; Fight; Visit; Investigation.

Court reschedules viewing of criminal case due to Non-citizens Congress leader’s poor health

Riga City Vidzeme Suburb Court announced today that the viewing of the criminal case in which leader of Non-citizens Congress Aleksandrs Gapoņenko is accused of inciting national hate will be postponed to a later date.

Producer prices in industry up 1.0% in Latvia in August

Compared to July, level of producer prices in the Latvian industry rose by 1.0 % in August 2018. Level of prices of products sold on the domestic market grew by 1.9 %, but of exported products – went up by 0.1 %.

Bishop: priest suspected of sexual abuse to be operated on in hospital

Pāvels Zeiļa, who is a priest of Rezekne Aglona diocese and the suspect in the criminal case regarding sexual violence and human trafficking, will undergo a complicated surgery on Friday, 21 September, as reported by Bishop Jānis Bulis.

Study: residents withdraw money from ATMs less often but in larger amounts

Every now and then discussions about dropping cash money altogether become active in society, AS PrivatBank representatives say.

HND Grupa design company, involved in Zolitude tragery, declared insolvent

Building engineer Ivars Sergets company HND Grupa, which was involved in the case revolving around the Maxima supermarket that collapsed in Zolitude, killing 54, not five years ago, has been declared insolvent, as reported by Latvijas Avīze.

Deputy Chief of State Fire and Rescue Service suspected of misappropriation

Latvia’s Interior Affairs Ministry’s Internal Security Bureau has detained deputy chief of State Fire and Rescue Service Ints Sēlis and one other official – a senior inspector, as reported by Panorāma programme of LTV.

Washington sanctions China for buying Russian military equipment

U.S. government has introduces sanctions against the Chinese army over a purchase of fighter jets and missile systems from Russia, despite a U.S. sanctions law targeting Moscow for attempts to sway in the 2016 U.S. election.

Autumn expected to begin soon in Latvia

Friday, 21 September, is expected to be warm in Latvia. Sun and considerable amount of clouds are expected, but not precipitation. Wind will draw in from the south, reaching a speed of 15-17 m/sec in western and central regions, as reported by Latvia’s Environment, Geology and Meteorology Centre.