A school of dolphins are seen swimming outside St. Croix island in Algoa Bay on July 8. Photo: AFP

 

Generators hum loudly in the background as a tour boat bobs past a towering vessel filled with ship fuel, anchored in Algoa Bay, a stone's throw away from the world's ­largest breeding colony of African penguins.

Mid-way along the Europe-Asia sea route, the bay's deep-water port was an obvious choice for South Africa's first offshore bunkering operation.

Since 2016, mostly cargo ships have pulled in for ship-to-ship refuelling, allowing them to carry more freight, bypass port fees and save time.

But conservationists, ecotour operators and nature lovers are alarmed about the long-term impact in a marine biodiversity hotspot and major foreign tourist magnet.

They claim the bunkering takes place too close to foraging and breeding grounds, disrupting the ecosystem and exposing sea animals to oil spills.

The risk has been highlighted by the catastrophic oil spill which began earlier this month into a protected marine park off the pristine coastline of Mauritius, ­after a bulk carrier ran aground on July 25.

With the main storage tanker in Algoa Bay able to hold 100,000 metric tons of fuel, opponents fear a potentially massive leak.

In two minor spills, in 2017 and 2019, rangers rescued dozens of oil-tarred penguins.

Scientists are also studying whether the noise, pollution and increased ship traffic could affect the marine animals.

They are particularly worried that vibrations caused by the activity may drive away those that rely on sonar to hunt fish.

"This is too close to the Marine Protected Area, there are too many risks involved…" warned environmental scientist Ronelle Friend, of the Algoa Bay Conservation community group, calling for an end to bunkering in the bay.

Follow the sardines  

Algoa Bay - an inlet off the city of Port Elizabeth in the Eastern Cape province - is home to myriad species of seabirds, including just under half the global population of African penguins, classed as endangered by the International Union for Conservation of Nature.

The world's largest group of bottlenose dolphins was recorded in the bay in 2018, according to a report last year by the Port Elizabeth-based Nelson Mandela University.

The site is also on the path of an ­annual sardine run, touted as one of the planet's most spectacular marine events.

"This [bunkering] operation is slap-bang in the middle of a hotspot for bait fish that birds feed on," said veteran whale watcher and tour operator Lloyd Edwards, who has run his Raggy Charters marine tours in the area for over two decades.

"People used to be blown away by the amount of animals we had in this bay," he said, adding he'd noticed that certain whale species were not easy to spot since the STS refuelling started.

'Safe, regulated, environmentally friendly'

Three maritime companies have acquired bunkering licences since 2016.  

Between them, they operate the main storage vessel and up to seven smaller bunker barges, according to Kosta Argyros, the South Africa representative for one of the three, Minerva Bunkering.

Sat on a key trade route, sea traffic has increased as a result of the fuelling hub, conservationists said.

Argyros stressed that bunkering was a "safe operation" in a "very regulated industry."

When "two vessels are tied together they become like one entity," he told AFP. 

"This is environmentally friendly no matter what the people say."

South African Marine Fuels, which was behind the July 2019 spill, said it "occurred due to an overflowing tank of the receiving vessel" and that between 200 and 400 litres (53 and 106 gallons) of oil fell into the sea.

The company "is highly committed to the safety of its operations and responsibility to people and the environment," it said in a statement to AFP.

Heron Marine, the third licensed company, said it operated according to all health, safety and environmental regulations.

Sludge-covered penguins  

About 100 oiled penguins were recovered from last year's spill.

Seabird scientist Lorien Pichegru said that, while damage from the incident had been limited, bunkering posed yet another threat to a species whose global population fell below 40,000 last year.

A volunteer moves a baby African penguin rescued from Algoa Bay at the SANCCOB Seabird rehabilitation center in Port Elizabeth on July 8. Photo: AFP

"The oil on their feathers takes away their waterproofness," said the Nelson Mandela University researcher, who has been studying African penguins in Algoa Bay since 2007.

Eventually they die of "starvation and cold," plus oiled adults tend to abandon their eggs and chicks, she added.

In attempting to clean themselves, the birds also ingest toxins shown to damage their internal organs and breeding capacity.

African penguins, distinct by their bray-like call and black horseshoe marking across their chest, only breed in South Africa and Namibia but are found in Mozambique too.

Over three decades, their numbers have fallen by more than 60 percent due to climate change, oil spills, human activity, overfishing and habitat destruction, experts say.

In Algoa Bay, the population has also fallen sharply - from 10,900 breeding pairs in 2015, to 6,100 in 2019, according to figures from South Africa's Environmental Affairs department.

Bad vibrations?

Parts of Algoa Bay last year were declared a Marine Protected Area.

A fuel ship vessel is seen anchored in Algoa Bay outside Port Elizabeth, on July 8. Photo: AFP

The 2019 university report on the Eastern Cape coastline, centered around the bay, also highlighted that it was a foraging area for seabirds, sharks, cetaceans and turtles, on the migration route for loggerhead and leatherback turtles and home to the world's largest Cape gannet colony.

However, scientists and conservationists say they have observed changes in animal behavior which they suspect are a consequence of bunkering activity - even without spillage.

"We think the noise of the engines disrupts the penguins' and dolphins' ability to find fish," said Gary Koekemoer, who heads the Wildlife and Environment Society of South Africa in Algoa Bay. "Any animal that is using sonar or sound to locate its prey will have difficulty navigating with the vibration from the engines."