Overfishing Krill (Secondary) - Lesson One
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La durée de la leçon est: 45 minIntroduction
This lesson explains what krill is and where it can be found.
Instructions
Time: 45 minutes
Contact: education@seashepherdglobal.org
© Sea Shepherd 2025
Instructions
Éléments de cette leçon
Slide 1 - Diapositive
This lesson is provided by Sea Shepherd. Sea Shepherd was founded in 1977 and is a marine conservation organisation working to protect the oceans and marine wildlife. Sea Shepherd works globally on a range of issues impacting the oceans, running numerous direct action campaigns each year.
Slide 2 - Diapositive
During the lesson we will use these icons to identify the learning actions.
Do you know what krill is?
Slide 3 - Carte mentale
Ask students “Do you know what krill is?”
Slide 4 - Diapositive
Krill is a tiny, shrimp-like crustacean that grows to around 3 - 6 cm in length.
There are 85 different species of krill found around the world.
There are 85 different species of krill found around the world.
Slide 5 - Diapositive
Krill consume phytoplankton, which is a single celled plant, that drifts at the water’s surface in summer, and the algae that grow on the underside of ice sheets in winter.
Phytoplankton live off the rays of the sun and carbon dioxide, along with nutrients provide by species like whales.
Phytoplankton live off the rays of the sun and carbon dioxide, along with nutrients provide by species like whales.
Slide 6 - Diapositive
Krill are found in every part of the ocean from the Arctic to the Antarctic. They are a critical part of the Antarctic ecosystem, where 5 species of krill can be found.
Slide 7 - Diapositive
Krill makes up the largest biomass on the planet. They may be small individually, but there is an estimated 400 million ton of Antarctic krill in the Southern Ocean (estimated in 2021).
This may sound like a lot, but krill populations have actually declined by 80% since the 1970s.
Ask students: “Why do you think this has occurred?”
This may sound like a lot, but krill populations have actually declined by 80% since the 1970s.
Ask students: “Why do you think this has occurred?”
Slide 8 - Vidéo
This video (8.52 min) shows krill in antarctica.
https://www.youtube.com/watch?v=J7SU_4Orym4
https://www.youtube.com/watch?v=J7SU_4Orym4
Slide 9 - Diapositive
Close
Slide 10 - Diapositive
Refer Lesson Guide for activity suggestions.
