Farmed Production of Some Fish - and Seaweed - is Soaring

Farmed salmon -- like the ones grown in pens here in the Australian island state of Tasmania -- are easier to grow than some other fish species. Gregory PLESSE / AFP/File
Farmed salmon -- like the ones grown in pens here in the Australian island state of Tasmania -- are easier to grow than some other fish species. Gregory PLESSE / AFP/File
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Farmed Production of Some Fish - and Seaweed - is Soaring

Farmed salmon -- like the ones grown in pens here in the Australian island state of Tasmania -- are easier to grow than some other fish species. Gregory PLESSE / AFP/File
Farmed salmon -- like the ones grown in pens here in the Australian island state of Tasmania -- are easier to grow than some other fish species. Gregory PLESSE / AFP/File

The amount of farmed seafood we consume -- as opposed to that taken wild from our waters -- is soaring every year, making aquaculture an ever-more important source for many diets, and a response to overfishing.

According to the UN's Food and Agriculture Organization, nearly 99 million tons of aquatic animals (fish, molluscs like oysters and mussels and crustaceans like prawns) were farmed around the world in 2023, five times more than three decades ago.

Since 2022, the farming of aquatic animals has been steadily overtaking fishing around the world -- but with large disparities from species to species.

Fast-growing species

The two biggest sellers on the market in 2023, carp and tilapia, mainly came from freshwater farming, while other widely-consumed fish, like herring, came just from deep sea fishing

Thierry Laugier, a researcher at Ifremer, France's national institute for ocean science and technology, told AFP that fish farmers choose species that grow quickly and with simple requirements, to be able to control the life cycle.

Sales of the most widely farmed fish in Europe, Atlantic salmon, came to 1.9 million tons in 2023, 99 percent of which were farmed.

"We know how to control the ageing or how to launch a reproduction cycle, through injecting hormones," Laugier said.

Asia main producer
Asia is by far the biggest producer of farmed fish, accounting for 92 percent of the 136 million tons -- of both animal and plant species -- produced under manmade conditions in 2023.

"For carp, it comes down to tradition, it has been farmed for thousands of years on the Asian continent," the Ifremer researcher said.

At the other end of the spectrum, sardines and herring are just fished in the oceans, mainly for profitability reasons as some fish grow very slowly.

"It takes around two years to get an adult-sized sardine," Laugier said.

He said farming of some fish has not yet been started as, "for a long time, we thought the ocean was an inexhaustible resource".

Seaweed

Little known in the West, seaweed nevertheless accounts for almost a third of world aquaculture production.

Almost exclusively from Asia, seaweed production increased by nearly 200 percent in two decades, to 38 million tons. It is mainly used in industry, in jellies, pharmaceuticals and cosmetics, the expert said.

He said seaweed also has the major advantage of absorbing not just CO2 in the oceans, but also nitrogen and certain pollutants.

"And from an ecological point of view it is better to farm macroalgae than salmon," Laugier said.



Record Cold Grips Argentina, Chile and Uruguay

The three South American countries have all recorded sharply below-zero temperatures as the polar air originated from Antarctica and swept across the region. SEBASTIAN LOSADA / AFP
The three South American countries have all recorded sharply below-zero temperatures as the polar air originated from Antarctica and swept across the region. SEBASTIAN LOSADA / AFP
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Record Cold Grips Argentina, Chile and Uruguay

The three South American countries have all recorded sharply below-zero temperatures as the polar air originated from Antarctica and swept across the region. SEBASTIAN LOSADA / AFP
The three South American countries have all recorded sharply below-zero temperatures as the polar air originated from Antarctica and swept across the region. SEBASTIAN LOSADA / AFP

A polar air mass has brought record low temperatures to Argentina, Chile and Uruguay, causing at least 15 deaths and forcing governments to restrict gas supplies and activate emergency shelters.

The three South American countries have all recorded sharply below-zero temperatures as the polar air originated from Antarctica and swept across the region, said AFP.

In Argentina, at least nine homeless people have died from the cold this winter, according to NGO Proyecto 7.

The capital Buenos Aires recorded its lowest temperature since 1991 at -1.9 degrees Celcius (28.6 Fahrenheit) on Wednesday, while the coastal city of Miramar saw snow for the first time in 34 years. Further south, the town of Maquinchao recorded -18C on Tuesday.

Electricity demand caused cuts across Buenos Aires, leaving thousands without power for over 24 hours in some areas.

The government suspended gas supplies to industries and petrol stations Wednesday to ensure household supplies, and removed price controls on gas cylinders Thursday.

Desert snow

Uruguay declared a nationwide "red alert" after six people died, allowing President Yamandu Orsi's government to forcibly move homeless people to shelters.

Montevideo recorded its lowest maximum temperature since 1967 at 5.8C on June 30, according to meteorologist Mario Bidegain.

Chile also activated homeless shelter plans during the coldest days. The city of Chillan, 400 kilometers (250 miles) south of Santiago, hit -9.3C, according to the Chilean Meteorological Directorate.

"What happened this week in Chile and the Southern Cone in general is a cold wave caused by an escape of a polar air mass from Antarctica," climatologist Raul Cordero from the University of Santiago told AFP.

Snow even fell in parts of the Atacama Desert, the world's driest, for the first time in a decade.

"It is not so common for these cold air masses to extend so far north, so we cannot rule out that this is also caused by climate change," meteorologist Arnaldo Zuniga told AFP.

The region expects relief in the coming days, with Buenos Aires reaching 12C on Thursday, Montevideo 14C and Santiago 24.7C.

"I was quite surprised by the change from cold to hot -- the change was very drastic," student Dafne Naranjo, 18, said in Santiago.

Climatologist Cordero said heatwaves have become more frequent than cold spells in recent years.

"The frequency of heatwaves has tripled, whether in summer or winter, not only in the Southern Cone but throughout the world," he said.