Antarctic krill: Antarctica's Superfood

by Victoria Boano Blog

The size of a paper clip, pink, krill is a shrimp-like crustacean that does not look like much. Without them, though, the Earth marine ecosystems would collapse completely.

Regions: Antarctica

Krill: Antarctica's Superfood

The size of a paper clip, pink, krill is a shrimp-like crustacean that does not look like much. Without them, though, the Earth marine ecosystems would collapse completely. 

Euphausia superba: the Antarctic krill

The Antarctic krill, Euphausia superba, are among the largest of the 85 known krill species and it can live up to ten years. They congregate in swarms in the cold waters around Antarctica, and their estimated numbers range from 125 million tons to 6 billion tons: the total weight of all the Antarctic krill is more than the total weight of all humans on Earth.

The body of Euphausia superba is about 2 inches long and translucent, with reddish brown blotches. The swimming larvae pass through nine stages of development. Males mature in about 22 months, females in about 25 months. During a spawning period of about five and a half months, the eggs are shed at a depth of about 740 feet. The krill larvae gradually move toward the surface as they develop, feeding on microscopic organisms. From January to April the swarms of krill in the Antarctic Ocean may reach concentrations of about 35 pounds per cubic yard.

Fundamental link in the food chain

The Antarctic krill are a fundamental link in the food chain: they are near the bottom, feeding mainly on phytoplankton and to a lesser extent zooplankton. They undertake large daily vertical migrations, providing food for predators near the surface at night and in deeper waters during the day. Half of all krill is eaten each year by whales, sea birds, seals, penguins, squid and fish, and it is quickly replaced by growth and reproduction. Watch some dramatic footage of humpback whales hunting krill in Antarctica.     

 

The luminescent crustacean

When cruising in Antarctic waters, you might perceive a strange luminescence in the ocean. It's the krill swarms emitting light, produced by bioluminescent organs which are located in various parts of the individual krill's body: one pair of organs at the eyestalk, another pair on the hips of the second and seventh thoracopods, and singular organs on the four pleonsternites. These organs emit a yellow-green light periodically, for up to two or three seconds.

Antarctic krill fishing

Commercial krill fishing began in the early 1970s, and in 1981 a unique fishing treaty was signed: the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR), which is designed to protect the Antarctic ecosystem from the consequences of rapidly-expanding fisheries, and to aid recovery of the great whales and some of the overexploited species of fish. The CCAMLR is an international body which manages the krill fishing and sets limits on the krill catch taking into account the needs of other elements of the ecosystem. The total allowable catch for the southwest Atlantic is currently about 5.6 million tonnes annually.    

The amazing nutritional properties of krill are not lost on humans. Krill are fished commercially mainly to produce animal food and fish bait, but there is a recent increase in the use of krill by the drug industry; they are also eaten in parts of Asia and used as an omega-3 supplement in the U.S. Pope Francis, for example, supplements his diet with krill oil supplements, a strong antioxidant rich in omega 3 fatty acid, and enriched with vitamin D3.

Related cruises

Antarctica - Polar Circle - Whale watching
Up to $4000 OFF

Antarctica - Polar Circle - Whale watching

Crossing the Polar Circle

PLA32-24 This Polar Circle and Antarctic Peninsula cruise passes through waters travelled by Humpback, Minke and Fin whales. Anchoring in various spots around the region, the expedition offers the chance to dive in the iceberg-heavy waters.

m/v Plancius

m/v Plancius

Cruise date:

21 Mar - 1 Apr, 2024

Berths start from:

5650 USD

Atlantic Odyssey, excl. Antarctic Peninsula
Up to $5950 OFF

Atlantic Odyssey, excl. Antarctic Peninsula

This far-ranging expedition voyage sails the breadth of the Atlantic, visiting several of the remotest islands in the world!

HDS31-24 The Atlantic Odyssey cruise visits some of the remotest islands in the world, crossing the migratory paths of Arctic Terns, Long-tailed Skuas, other birds, and a variety of whales as they make their annual expeditions north for the breeding season.

m/v Hondius

m/v Hondius

Cruise date:

28 Mar - 20 Apr, 2024

Berths start from:

4250 USD

St. Helena to Cape Verde
Up to $650 OFF

St. Helena to Cape Verde

Witness the northbound spring migration

HDS32-24 During the days at sea the chances of meeting whales are high. Witness the northbound spring migration of northern birds like Arctic Terns and Long-tailed Skuas who join us in crossing the Equator (“the Line”).

m/v Hondius

m/v Hondius

Cruise date:

20 Apr - 30 Apr, 2024

Berths start from:

2150 USD

Falkland Islands - South Georgia - Antarctica

Meet at least six penguin species!

PLA20-24 A cruise to the Falkland Islands, South Georgia & the Antarctic Peninsula. Visit some of the most beautiful arrays of wildlife on Earth. This journey will introduce you to at least 6 species of penguin and a whole lot of Antarctic fur seals!

m/v Plancius

m/v Plancius

Cruise date:

18 Oct - 7 Nov, 2024

Berths start from:

13350 USD

Antarctica - Basecamp - free camping, kayaking, snowshoe/hiking, photo workshop, mountaineering

The best activity voyage in Antarctica

HDS21a24 The Antarctic Peninsula Basecamp cruise offers you a myriad of ways to explore and enjoy the Antarctic Region. This expedition allows you to hike, snowshoe, kayak, go mountaineering, and even camp out under the Southern Polar skies.

m/v Hondius

m/v Hondius

Cruise date:

1 Nov - 13 Nov, 2024

Berths start from:

8800 USD

Loading