THE NORTHERN PRAWN
- The northern prawn is a hermaphrodite
- Lawnmowers of the sea ice – the small crustaceans
- The opilio crab
You solve the tasks by using
- Text
- Audio
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- Pictures
This part is based on pp. 22-29 – there you will find information about the subject.
Read about the northern prawn, krill and the opilio crab.
The northern prawn is a common species of prawn in the Disko Bay.
It changes sex from male to female after the first five to six years of its life.
Prawns are an important source of food in the arctic food web, and play a substantial role in the fishing industry and the economy of Ilulissat.
The northern pawn is a protandrous hermaphrodite. What does that mean?
What does the prawn eat?
Why is the northern prawn so important to the economy in Ilulissat?
The small crustaceans in the Icefjord go by several names. One of them is krill.
In 1 m3 of water may live 10-30.000 krill.
Krill feed on the phytoplankton under the sea ice.
They have stiff brushes on the tips of their legs and use these to “graze” the layer of algae.
Why is krill called the lawnmower of the sea ice?
Study the marine food web: who eats krill?
On page 12 the world under the ice is called the grassy plains of the arctic area – what can krill be compared to?
The Opilio, or snow crab can live in areas with temperatures as low as -1°C.
You can tell females from males by the size of their shell.
After mating the female keeps the eggs for 1-2 years under her abdomen before they are hatched, depending on the temperature.
The larvae eat phytoplankton.
Why are the crab’s eggs hatched in springtime?
What is the physical difference between the male and female crab?
Where in the marine food web (page 13) would you place the opilio crab?
The northern prawn is a common species of prawn in the Disko Bay.
It changes sex from male to female after the first five to six years of its life.
Prawns are an important source of food in the arctic food web, and play a substantial role in the fishing industry and the economy of Ilulissat.
The northern pawn is a protandrous hermaphrodite. What does that mean?
What does the prawn eat?
Why is the northern prawn so important to the economy in Ilulissat?
The small crustaceans in the Icefjord go by several names. One of them is krill.
In 1 m3 of water may live 10-30.000 krill.
Krill feed on the phytoplankton under the sea ice.
They have stiff brushes on the tips of their legs and use these to “graze” the layer of algae.
Why is krill called the lawnmower of the sea ice?
Study the marine food web: who eats krill?
On page 12 the world under the ice is called the grassy plains of the arctic area – what can krill be compared to?
The Opilio, or snow crab can live in areas with temperatures as low as -1°C.
You can tell females from males by the size of their shell.
After mating the female keeps the eggs for 1-2 years under her abdomen before they are hatched, depending on the temperature.
The larvae eat phytoplankton.
Why are the crab’s eggs hatched in springtime?
What is the physical difference between the male and female crab?
Where in the marine food web (page 13) would you place the opilio crab?
