One of the more memorable scenes in nature shows we've all watched at one time or another is the sight of large salmon swimming and leaping upstream to spawn. Take this quiz and learn more about the life of the salmon.
What is the purpose of a redd?
resting place after spawning
gravel nest for eggs
shelter from predators
What happens when the embryos hatch?
They become yolk-sac fry.
The female takes care of them until they can fend for themselves.
The young fish begin to feed on underwater vegetation.
What kind of marine life provides sustenance for alevins?
What are smolts?
young female salmon
young sea-water salmon
Do the salmon born in freshwater have to remain there?
It depends on whether their parents were saltwater or freshwater fish.
They change physically to adapt to saltwater.
What does the spotted coloring of the salmon indicate?
young salmon living in streams
sexually mature young salmon
the salmon is ready to migrate to the ocean
What happens to their appearance before the salmon reach the ocean?
Fins grow larger to cope with ocean currents.
Teeth become sharper to hunt smaller fish.
They become silvery.
What kind of water do smolts prefer?
What happens to most species after spawning?
return to their usual habitats
feed hungrily and become easy prey
die from exhaustion
What danger do decomposing fish bodies pose for a freshwater stream?
pollute the water
drive away other fish
What is unusual about pink salmon spawning in Washington State?
What is the record weight of a Chinook salmon?
15 pounds (6.8 kg)
31 pounds (14.kg)
135 pounds (61 kg)
What differentiates Chinook from Coho, Chum or Sockeye salmon apart from size?
The Chinook spawn all year round.
They have spring and summer runs.
They don't swim against the current to spawn.
Do any species of salmon spawn mainly in spring?
How can flooding resulting from overly abundant rains affect salmon spawning?
More water means more food, which is good for spawning.
Flooding deepens the waters and expands potential spawning grounds.
Flooding can wash away eggs.
What happens in an ecosystem where salmon have become extinct?
Other species of fish flourish.
Entire ecosystem is at risk.
There is a higher risk of pollution.
Of all the eggs laid by the female, how many survive to return later to spawn?
one in 1,000
10 in 1,000
50 in 1,000
What do salmon tend to look for in spawning grounds?
warm waters with dense vegetation
water with no woody debris
clean, cool water with gravel
Why would the pink and chum salmon migrate to saltwater immediately after hatching?
They are saltwater fish and cannot survive for long in freshwater.
They have greater chances of survival in the ocean.