Dead dolphins, naval mines: Russia-Ukraine war destroys the Black Sea

Kyiv, Ukraine – Fishers and poachers along the Black Sea coast often find suffocated dolphins entangled in their nets,

They release them by cutting off their fins and dropping them in the sea. Their bodies, with net marks on their skin, are often washed ashore.

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Fishing and poaching in littoral Black Sea nations plummeted because of Russia’s 2022 full-scale invasion, as Moscow strove to occupy all of Ukraine’s Black Sea coast.

It failed – but the ongoing hostilities have been killing “hundreds times more” bottlenose and short-beaked dolphins and harbour porpoises, according to Ivan Rusev, head researcher at the Tuzly Lagoons national park in southern Ukraine.

In 2022 alone, some 50,000 dolphins died this way, and by 2026, the number exceeded 120,000, or one in four cetaceans in the Black Sea, Rusev told Al Jazeera.

Dolphins are apex predators, and their decimation further ruins the Black Sea’s ecosystem already affected by chemicals from munitions, spills of oil, fuel and vegetable oils from dozens of sunk or damaged warships, tankers and freighters.

Many dead dolphins still have their fins, but look starved.

Fish species such as mullet and bluefish have become scarce, even though fishing in Black Sea nations has been affected by restrictions, bans and naval mines that were spotted near Istanbul.

The changes inevitably affect the dolphins.

“With dolphins at the top of the food chain, everything from zooplankton to fish reaches them,” Rusev said.

Environmentalists from other Black Sea nations – Bulgaria, Romania, Turkiye – also reported a spike in dolphin deaths, even though the cause of their death couldn’t always be established.

“Most of the stranded dead cetaceans are usually in an advanced state of decomposition, making detection of net marks and other marks almost impossible,” Dimitar Popov of Green Balkans, Bulgaria’s oldest nature conservation group, told Al Jazeera.

He agrees with Rusev that “sonar systems of warships and submarines definitely affect cetaceans and their echolocation and hearing abilities”.

Since 2022, Ukrainian sea and airborne drones have sunk two submarines and three dozen Russian warships, including the Black Sea Fleet’s flagship, the Moskva (Moscow) guided missile cruiser.

They were all loaded with toxic fuel and other chemicals.

Even though Ukrainian drone operators attacking Russian “shadow fleet” tankers are instructed to specifically target their engines, oil and fuel spills continue to happen.

Oil molecules form a film that coats seaweed, poisoning molluscs and fish, especially sturgeons that die in droves.

Every explosion deafens and kills fish, and the sound, coupled with flying drones, startles birds migrating back and forth between Northern Europe and the Middle East.

“And when a bird can’t find enough food, doesn’t have ‘fuel,’ it can’t reach the destination where it winters or nests,” Rusev said. “It will affect the number of certain bird populations for years.”

Startled by the blasts, flamingoes, who only started nesting in his park years ago, are leaving their hatches, and seagulls immediately eat the eggs, he said.

The war’s only silver lining for wild nature around the sea is that the number of boars, roes, foxes, jackals, hares and badgers has risen because hunting and poaching nearly stopped, he said.

And the ecosystem’s post-war recovery is going to be uneven.

While the number of insects and small mammals should return to normal within years, the dolphin population’s recovery will take decades.

“We estimate that it would take 30 to 50 years to renew the population of cetaceans, so that the sea ecosystem becomes more or less normal,” Rusev said.