Krill

Krill are tiny shrimp-like crustaceans that live in the world’s oceans and play a vital role in the marine food chain. They serve as the main food source for whales, seals, penguins, and many fish species. Despite their small size, krill are incredibly important for ocean ecosystems and even have commercial uses, such as krill oil supplements and aquaculture feed.

Krill Facts Overview

Length	1–6 cm (varies by species)
Weight	0.2–2 grams
Top Speed	~2–3 km/h
Food	Phytoplankton, microscopic algae
Color	Transparent to reddish-pink
Location	Oceans worldwide
Predators	Whales, seals, fish, penguins
Lifespan	2–6 years
Habitat	Open ocean swarms

What are krill?

Krill are crustaceans that live in seawater. Though they look like shrimp, they are a different species. They use their many legs to swim and catch food. Like many marine animals, krill are threatened by the effects of climate change.

Can humans eat krill?

Yes, humans can eat krill. Krill are rich in protein, omega-3 fatty acids, and antioxidants. They’re often used to make krill oil supplements or processed into powders and snacks. However, they’re not commonly eaten whole because they’re tiny and mostly used for animal and fish feed.

How do blue whales only eat krill?

Blue whales eat mainly krill, consuming 10–20 tons daily and up to 50 million calories. Their huge size helps capture more krill. Like big cats, they’re obligate carnivores, getting energy from fats and proteins, not carbs, using ketogenesis and protein breakdown to meet all nutritional needs.

Can dolphins eat krill?

Most dolphins don’t eat krill. They usually eat fish, squid, and other larger sea animals. However, some smaller dolphin species may eat tiny crustaceans like krill or shrimp when other food is scarce. Overall, krill aren’t a main part of a dolphin’s diet.

What is krill used for?

Krill are used in many ways. They are a vital food source for marine animals such as whales, seals, penguins, and fish. Humans also use krill to make krill oil supplements, which are rich in omega-3 fatty acids and support heart and brain health. In aquaculture, ground krill are used as feed for farmed fish and shrimp, and they are also added to pet food for extra nutrition and flavor. Additionally, scientists study krill to better understand ocean ecosystems and the effects of climate change.