Jonathan Green had been tracking a whale shark named Hope across the eastern Pacific for 280 days when the satellite transmissions from a GPS tag on her dorsal fin abruptly stopped.

It was not unusual for the GPS signal to go silent, even for weeks at a time, said Green, a scientist who has been studying the worlds largest fish for three decades in the unique marine ecosystem around the Galpagos Islands.

But then he looked at satellite images in the area where Hope was last tracked more than a thousand nautical miles west of the islands and noticed the ocean was being patrolled by hundreds of Chinese fishing boats.

I began to look into it and found that at the very end of her track she began to speed up, said Green, co-founder and director of the Galpagos Whale Shark Project.

It went from one knot to six or seven knots for the last 32 minutes which is, of course, the speed of a fishing boat, he said.

The fishing vessels that Green saw on the satellite images are believed to belong to an enormous Chinese-flagged fleet which Ecuadorian authorities last week warned was just outside the Galpagos Islands territorial waters.

I dont have proof but my hypothesis is that she was caught by vessels from the same fleet which is now situated to the south of the islands, Green told the Guardian. She is the third GPS-tracked whale shark to have gone missing in the last decade, he added.

The Chinese fleet, numbering more than 200 vessels, is in international waters just outside a maritime border around the Galpagos Islands and also Ecuadors coastal waters, said Norman Wray, the islands governor.

Chinese fishing vessels come every year to the seas around the Galpagos, which were declared a Unesco world heritage site in 1978, but this years fleet is one of the largest seen in recent years. Of the 248 vessels, 243 are flagged to China including to companies with suspected records of illegal, unreported and unregulated, or IUU, fishing, according to research by C4ADS, a data analysis NGO.

The fleet includes fishing boats and refrigerated container or reefer ships to store enormous catches.

Transferring cargo between vessels is prohibited under international maritime law yet the Chinese flotilla has supply and storage ships along with longline and squid fishing boats.

There are some fleets which dont seem to abide by any regulations, said Wray.

One captain of an Ecuadorian tuna boat saw the Chinese fishing boats up close in early July, before the end of the tuna season.

They just pull up everything! said the captain, who asked not to be named. We are obliged to take a biologist aboard who checks our haul; if we catch a shark we have to put it back, but who controls them?

He recalled navigating through the fleet at night, constantly changing course to avoid boats, as their lights illuminated the sea to attract squid to the surface.

It was like looking at a city at night, he said.

The longline fishing boats had up to 500 lines, each with thousands of fishhooks, he estimated, and claimed that some of the vessels would turn off their automatic tracking systems to avoid detection, particularly when operating in protected areas.

Chinese fishing practices first caught the attention of Ecuador in 2017 when its navy seized the Chinese reefer Fu Yuan Yu Leng 999 within the Galpagos marine reserve. Inside its containers were 6,000 frozen sharks including the endangered hammerhead shark and whale shark.

It was a slaughterhouse, said Green, describing the images of the cargo hold. This kind of slaughter is going on on a massive scale in international waters and nobody is witnessing it.

The seizure prompted protests outside the Chinese embassy in Quito; Ecuador fined the vessel $6m and the 20 Chinese crew-members were later jailed for up to four years for illegal fishing.

The arrival of the latest fleet has also stirred public outrage and a formal complaint by Ecuador as its navy is on alert for any incursion into Ecuadorian waters.

The Chinese embassy in Quito said that China was a responsible fishing nation with a zero-tolerance attitude towards illegal fishing. It had confirmed with Ecuadors navy that all the Chinese fishing vessels were operating legally and dont represent a threat to anyone, it said in a statement last month. On Thursday China announced a three-month fishing ban in the high seas west of the marine reserve, but it will not come into force until September.

Roque Sevilla, a former mayor of Quito, who is leading a team in charge of designing a protection strategy for the islands, said the fleet practices indiscriminate fishing regardless of species or age which is causing a serious deterioration of the quality of fauna that we will have in our seas.

Ecuador would establish a corridor of marine reserves with Pacific-facing neighbours Costa Rica, Panama and Colombia to seal off important areas of marine diversity, Sevilla told the Guardian.

Protecting the Cocos Ridge, an underwater mountain range which connects the Galpagos Islands to mainland Costa Rica, and the Carnegie Ridge which links the archipelago to Ecuador and continental South America, could close off more than 200,000 sq nautical miles of ocean otherwise vulnerable to industrial fishing, he said.

He added Ecuador had called for a diplomatic meeting with Chile, Peru, Colombia and Panama to present a formal protest against China.

When the Galpagoss protected area was first created it was cutting edge, said Matt Rand, director of the Pew Bertarelli Ocean Legacy, but compared to other newer marine protected areas Galpagos is now potentially lacking in size to protect the biodiversity.

Milton Castillo, the Galpagos Islands representative for Ecuadors human rights ombudsmans office, said he had asked the prosecutors office to inspect the cargo holds of the Chinese ships based on the legal principle of the universal and extraterritorial protection of endangered species.

Chinas distant-water fishing fleet is the biggest in the world, with nearly 17,000 vessels 1,000 of which use flags of convenience and are registered in other countries, according to research by the Overseas Development Institute.

The fleet often fishes in the territorial waters of low-income countries, the report said, having depleted fish stocks in domestic waters.

Green said the explosion of life created by the confluence of cold and warm ocean currents around the Galpagos Islands is exactly why the Chinese armada is hovering around the archipelagos waters.

The Galpagos marine reserve is a place of very great productivity, high biomass but also biodiversity, he said. The longline fishing technique used by the fleet catch big fish like tuna, but also sharks, rays, turtles and marine mammals like sea lions and dolphins, he added.

This is not fishing any more, it is simply destroying the resources of our oceans, Green said. We should ask whether any nation on this planet has the right to destroy what is common ground.

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'They just pull up everything!' Chinese fleet raises fears for Galpagos sea life - The Guardian