Krill Harvests for Supplement Industry May Have Cascading Effects on Vulnerable Antarctic Ecosystems
As oceans warm and weather patterns become more extreme, scientists are beginning to reckon with how massive the ripple effects caused by small environmental damage events may be going forward. The ocean is the largest ecosystem on Earth, covering more than 70% of the planet. The massive scale of the global ocean system creates serious risk for cascading effects from small damaging events. A recent study by researchers at the University of Chicago displays how extreme these effects may be, by connecting a fatal disease in bats to an 8% rise in rates of deaths in humans. By comparing rates of mortality in humans by cause in counties with and without instances of the fatal White-nose syndrome in bats, they noticed only an increase in deaths related to birth defects and disease. As a result, a clear picture of the interconnectedness of our world begins to form. The loss of the insectivores (bats) within the ecosystem forced farmers to increase their insecticide use, likely leading to the higher specific fatalities in humans. Even though certain insecticides causing negative health effects in people is a well-researched phenomenon, the link between losing natural performers of ecosystem functions and human suffering has rarely been so clear. As investigations into the widespread effects of the climate crisis and human industry continue, a bustling market threatens the survival of the entire Antarctic ecosystem.
Every ecosystem on Earth is connected, and the manufacture of products based on the natural resources of these regions deeply affects their health. Omega-3 products, also called fish oil supplements, are purported to provide a multitude of health benefits and anti-inflammatory action within the body. While the many positives of taking these supplements may be clear (particularly for those with a diet lacking in fatty fish), some sources of omega-3s can have devastating effects on the environment. Around 68% of the largest retailers across the globe were found to sell fish oil supplements containing Antarctic krill. A report published by the Changing Markets Foundation reveals that some diet supplements sold by major retailers massively contribute to the pilfering of krill in the Southern Ocean, and their production is one main cause for the skyrocketing krill demand. The supply chain which provides the Antarctic krill for these supplements presents even more questions.
Antarctica is already warming up to three times faster than the rest of the world. These rapidly changing conditions pose great risks to species like Antarctic krill, which threatens nearly all other life in the region as these krill are keystone species in the food web. Baleen whales, such as gray whales and blue whales, rely on the krill they filter into their mouths as they swim through the water. As krill harvests continue rapidly, whale populations may be damaged beyond what their current populations can support.
Whales in Antarctica are not only harmed by these declines in their main food source, but by the fishing equipment itself. In 2024, the deaths of two and likely fatal injuries of two other humpback whales were revealed amid negotiations about updating international fishing limits in the Southern Ocean. Land in Antarctica is protected by various agreements among nations to protect its incredible diversity, yet these protections fail to extend to the ocean surrounding it. As a result, endangered species like blue whales may face elevated threat levels. On the IUCN Red List, blue whales still face fatal injury from ships and other human industry in these unprotected waters.
The practices of some of the largest Antarctic krill fishing operations have been called into question by researchers, activists, and NGOs across the globe. The Changing Markets Foundation indicated in a report that these huge operations force sensitive species to compete for food with the fishing vessels. Some organizations are now dedicated to tracking the impacts of this industry, such as the somewhat controversial Sea Shepherd. Using direct tactics involving trailing fishing vessels and physically getting in their way, Sea Shepherd acquired evidence that a common tactic krilling vessels use involves following pods of whales feeding near the surface to locate catch. The actions of supertrawlers in the Southern Ocean even lead to the lodging of criminal complaints, such as a Chilean-flagged vessel which was accused of killing a whale in 2025. The vessel, called the Antarctic Endeavor, has a reputation for being involved in fatal entanglements. The lack of stricter international treaties on fishing operations in the Southern Ocean creates an environment where the ship’s country of origin presides over the legal case, leading to these instances of repeat offenders.
In 2022, the Intergovernmental Panel for Climate Change (IPCC) recommended industry officials find alternate sources to Antarctic krill. The harvesting of krill already shows signs of altering population levels and behavior, prompting calls for updating catch limits and further investigations. Presently, calculations done by scientists at Stanford suggest declining krill populations may limit the recovery of endangered whale populations before they are ever able to return to pre-whaling levels.
During the height of historical whaling, whale populations fell by 90%, alongside a similar decline in krill. The outsized effects Antarctic krill have as a keystone species, combined with the ecological importance of whales in our oceans creates a precarious situation in trying to balance industry and conservation. There may be viable alternatives to krill-based fish oil products, such as those synthesized from microalgae. Consumers can choose to purchase omega-3 supplements from retailers using fish oil derived from sources besides Antarctic krill, and continue researching the industry behind products before making purchases. While there are some current recommendations floating around, governments and regulators worldwide have taken little action. As industry players and conservationists clash over the issue, the clock is ticking to prevent further damage.
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