November 19 Flashcards Preview

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Flashcards in November 19 Deck (30):
1

Are salmon dependant on river system?

Yes

2

Where do pacific salmon spawn?

In river gravel upstream the eggs must have a lot oxygen available

3

What is the Alvien stage?

When salmon eggs develop gills but still get nutrients from the yolk

4

What is the fry stage?

Small fish getting markings and feed in freshwater and move into salt water

5

What is smolting?

Fish become silver, this is an adaptation to salt water

6

What are the five types of pacific salmon?

Coho
Chinook
Sockeye
Pink
Chum

7

What is the largest type of pacific salmon?

Chinook

8

Describe a Chinook salmon?

They are the largest salmon, they live in salt water for 2 years and live for 7 years. They are killer whale food

9

Describe sockeye salmon?

They are the most valuable salmon and are generally found in larger systems like lakes for spawning

10

True or false:
Bigger fish have more eggs

True

11

Describe pink salmon.

It is the smallest salmon and has a fixed 2 year cycle spawning

12

Describe chum salmon?

Low in fat content and occupy small and large rivers. They are the least equips to jump waterfalls

13

What happens to mud flaps when sea levels rise?

They get flooded

14

What happens to salmon populations with temperature rise?

The population decreases

15

Why do salmon populations shrink in warmer water?

When water is warmer the prey for salmon are less abundant and the predators are more abundant

16

Why does warm water deplete salmon prey?

Warmer water breeds more disease and and eddies are stronger

17

How much has sea surface temperature rise?

5 degrees

18

True or false:
Salmon can spawn in any river

False they always spawn in the same river and know based on touch

19

What is the optimal ocean temperature for sockeye salmon?

15 degrees

20

How do salmon find their spawning rivers?

Smell

21

What is the difference between Atlantic and pacific salmon?

Pacific spawn once, Atlantic spawn several times

22

Why are dead salmon good for the ecosystem?

They give nutrients to the forest and animals

23

What are the two types of fishing?

Troller (high seas)
Gillnetter (river mouth)
Seineboat (multimillion)

24

What happens to grizzly bears when salmon decreases?

They starve

25

How many fish do orcas need to survive per day?

670

26

Trawling vs trolling

Trawling is dragging I the floor, trolling is with a line and hook

27

How do dams effect salmon?

They impede spawning even though they invented a salmon ladder

28

If fish in fish farms get sick does the government have to tell us?

No

29

What percentage of hatchery fish are in the total catch?

35-40

30

Where do pacific salmon live?

They live in salt water and spawn in fresh water