More than 14m tonnes of plastic believed to be at the bottom of the ocean

Thirty times more plastic on ocean floor than surface, analysis suggests, but more trapped on land than sea

At least 14m tonnes of plastic pieces less than 5mm wide are likely sitting at the bottom of the world’s oceans, according to an estimate based on new research.

Analysis of ocean sediments from as deep as 3km suggests there could be more than 30 times as much plastic at the bottom of the world’s ocean than there is floating at the surface.

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Russian rocket fuel leak likely cause of marine animal deaths

Injured surfers and large number of dead sea creatures reported in Kamchatka region

Water pollution in Russia’s Kamchatka peninsula that caused sea creatures to wash up dead on beaches has prompted fears that rocket fuel stored in the region’s military testing grounds may have leaked.

The pollution came to light late last month after surfers reported stinging eyes and said the water had changed colour and developed an odour. Officials later confirmed the surfers had sustained mild burns to their corneas.

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How Tunisia’s shrinking economy and fish stocks put shark on the menu

A lack of awareness and ever-increasing competition among fishing boats threaten one of the sea’s most vital species

The temperature is cooling down in the fish market in Monastir, Tunisia. Still, the suffocating smell of the fish guts that have sat through the full force of the day’s heat hangs heavy in the air. The stallholders have left now, but on the floor amid the detritus is the unmistakable shape of a severed shark’s head.

Nearby, in a skip, the bodies of two guitarfish rays lie discarded, stripped of meat to the cartilage.

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Orcas ram boat off the coast of Spain – video

Three orcas rammed a boat off the coast of Spain.

The incident lasted 45 minutes, during which the animals bit off part of the the sailing boat's rudder as the crew had to travel to a port in Galicia to check for further damage.

A number of incidents involving orcas and sailing boats have been reported near Spanish and Portuguese coasts, but the reasons behind the behaviour are still not clear

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Spain bans yachts from stretch of sea after orcas damage boats

Yachts less than 15 metres told to avoid area near coast of Galicia after series of incidents

Small yachts have been ordered to steer clear of a stretch of water off the north-west coast of Spain after at least three boats were damaged by a gang of boisterous orcas.

On Tuesday, Spain’s transport ministry said yachts of less than 15 metres in length would be banned from sailing close to the coast between Cape Prioriño Grande and Estaca de Bares point in Galicia for a week.

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380 whales dead in worst mass stranding in Australia’s history

More than 450 long-finned pilot whales became stranded in harbour in Tasmania with rescuers managing to save about 50

About 380 pilot whales were confirmed dead in Tasmania’s west on Wednesday afternoon with rescuers fighting to save the remaining 30 that are still alive.

More than 450 long-finned pilot whales were caught on sandbanks and beaches inside Macquarie Harbour with a rescue effort starting on Tuesday morning.

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Dolphin numbers up in Hong Kong after Covid crisis halts ferries

Revival prompts calls to divert boats to help protect native Indo-Pacific humpbacks

Large numbers of dolphins returned to Hong Kong waters within weeks of the Covid-19 crisis shutting down high-speed ferries, and researchers are now calling for protections before the ferries resume.

Indo-Pacific humpback dolphins, also known as Chinese white dolphins and pink dolphins, are native to the Pearl River estuary, but typically avoided the waters between Hong Kong and Macau because of the high volume of high-speed boats.

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‘I’ve never seen or heard of attacks’: scientists baffled by orcas harassing boats

Reports of orcas striking sailing boats in the Straits of Gibraltar have left sailors and scientists confused. Just what is causing such unusually aggressive behaviour?

When nine killer whales surrounded the 46ft boat that Victoria Morris was crewing in Spain on the afternoon of 29 July, she was elated. The biology graduate taught sailing in New Zealand and is used to friendly orca encounters. But the atmosphere quickly changed when they started ramming the hull, spinning the boat 180 degrees, disabling the autohelm and engine. The 23-year-old watched broken bits of the rudder float off, leaving the four-person crew without steering, drifting into the Gibraltar Straits shipping lane between Cape Trafalgar and the small town of Barbate.

Related: Scientists baffled by orcas ramming sailing boats near Spain and Portugal

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Scientists baffled by orcas ramming sailing boats near Spain and Portugal

From the Strait of Gibraltar to Galicia, orcas have been harassing yachts, damaging vessels and injuring crew

Full story: ‘I’ve never seen or heard of attacks’ – scientists baffled by orcas harassing boats

Scientists have been left baffled by incidents of orcas ramming sailing boats along the Spanish and Portuguese coasts.

In the last two months, from southern to northern Spain, sailors have sent distress calls after worrying encounters. Two boats lost part of their rudders, at least one crew member suffered bruising from the impact of the ramming, and several boats sustained serious damage.

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Gold Coast surfer killed by shark may have died before being helped to shore, witnesses say

Tuesday’s fatal incident has reignited the debate about the efficacy of nets and drumlines in protecting beachgoers from shark attacks

Gold Coast surfer Nick Slater was paddling in barely waist-deep water when he was attacked by a shark and the 46-year-old may have died before he was helped to the shore, witnesses have said.

Tuesday’s incident was the first fatal shark attack at the tourist destination’s beaches since 1958 and it has reignited the debate about the efficacy of nets and drumlines.

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Researchers reveal true scale of megalodon shark for first time

UK study shows dorsal fin of prehistoric mega-fish was similar height to adult human

The enormous size of a prehistoric mega-shark made famous in Hollywood films has been revealed for the first time in its entirety by a UK study.

Previously only the length of the Otodus megalodon had been estimated, but a team from the University of Bristol and Swansea University has determined the size of the rest of its body, including fins as large as an adult human.

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Covid turns tide on India’s Ganesh festival traditions

Thousands of ritual statues are dunked into the sea off Mumbai each year – but coronavirus and pollution concerns are forcing change

In the quiet housing estate of Angrewadi in the heart of Girgaon in south Mumbai, people are celebrating the 100th consecutive year of the Ganesh Chaturthi, the Hindu festival of the elephant-headed god of new beginnings. Statues of Lord Ganesh are brought into homes and put on display for offerings and prayers.

On the 11th and final day of the festival, the ritual of Ganesh Visarjan takes place – falling this year on 1 September. The statues, normally made of soluble plaster of paris, are traditionally carried in a public procession with music and chanting, and are then immersed in either a river or the sea. Here, they slowly dissolve in a ceremony that dramatises the Hindu view of the ephemeral nature of life – but also causes widespread pollution.

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Spanish fishing boats land only a tenth of normal catch of octopus

Meteorological and environmental reasons cited as reasons for record low catches

Spanish fishing boats are landing only a tenth of their normal summer catch of octopus – an unheard-of drop.

To date, since 1 July they have caught 38 tonnes of octopus, compared with a normal average of 378 tonnes over the same period. Income has slumped by 84%. Catches vary from year to year but such a huge drop is unprecedented.

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‘It’s terrifying’: can anyone stop China’s vast armada of fishing boats?

Ecuador stood up for the Galápagos, but other countries don’t stand a chance against the 17,000-strong distant-water fleet

The recent discovery by the Ecuadorean navy of a vast fishing armada of 340 Chinese vessels just off the biodiverse Galápagos Islands stirred outrage both in Ecuador and overseas.

Under pressure after Ecuador’s strident response, China has given mixed signals that it could begin to reel in its vast international fishing fleet. Its embassy in Ecuador declared a “zero tolerance” policy towards illegal fishing, and this week it announced it was tightening the rules for its enormous flotilla with a series of new regulations.

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Tokyo Bay’s seaweed forests – and prized abalone that live in them – disappear

Rise in sea temperatures caused by climate emergency is transforming marine environment and affecting local species

The waters off Kyonan were once home to dense forests of seaweed – the ideal habitat for the prized abalone and sardines that support the town’s economy.

Today, the seaweed beds are threadbare; in some places they have vanished altogether, to be replaced by coral that belongs in the tropics, not in this corner of Tokyo Bay. Marine life that depended on macro algae for survival is making way for fish usually found in waters much further south.

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Experts and volunteers scramble to save Mauritius’s wildlife after oil spill

Grounded carrier has split in half and poor conditions make removal of ship’s remaining oil risky

International experts and thousands of local volunteers were making frantic efforts on Sunday to protect Mauritius’s pristine beaches and rich marine wildlife after hundreds of tonnes of oil was dumped into the sea by a Japanese tanker in what some scientists called the country’s worst ecological disaster.

Related: Grounded carrier off Mauritius breaks apart risking ecological disaster

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Grounded carrier off Mauritius breaks apart risking ecological disaster

Battle is on to remove fuel oil from Japanese vessel the MV Wakashio as weather worsens

A Japanese bulk carrier that ran aground on a reef in Mauritius last month threatening a marine ecological disaster around the Indian Ocean island has broken apart, authorities said on Saturday.

The condition of the MV Wakashio was worsening early on Saturday and by early afternoon, it had it split, the Mauritius National Crisis Committee said.

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Supertrawlers ramp up activity in UK protected waters during lockdown

Fishing time in first half of 2020 almost double that in whole of last year, Greenpeace says

Supertrawlers vastly stepped up their fishing in the UK’s protected waters during the coronavirus lockdown earlier this year, while most of the UK’s smaller vessels were confined to port.

The amount of time supertrawlers spent fishing in marine protected areas in the first half of this year was nearly double that spent in the waters in the whole of last year, according to a Greenpeace investigation. There were 23 supertrawlers catching fish in UK protected areas in the period, none of them UK-owned.

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Close encounter: mother and calf humpback whales stun surfers at Sydney’s Manly beach

Images show dozens of surfers about 10 metres from whales, which migrate up and down the Australian coast

A humpback whale calf, closely followed by its mother, came within metres of surfers and swimmers at Manly beach, in Sydney’s north, on Sunday afternoon.

It is unusual to see a whale calf so early in the year in Sydney. Eastern Australian humpbacks migrate north from Antarctica, along the coast to tropical waters in north Queensland from April to July.

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