1) Name two reasons for the decline of the Northwest's wild salmon.
fishing, habitat destruction from logging, salmon hatcheries,
While only 10% of smolts in the Columbia are wild, 30% of returning
adults are wild. What can you conclude about the wild fish as opposed
to the hatchery fish based on these figures?
wild fish are better adapted to the environment than are the hatchery
Name two ways biologists are trying to help the salmon of the Columbia
fish screens at dams, adjusting turbines, reducing predators.
Which figure is closest to the number of wild adult salmon that
returned to Maine rivers in 2001?
fewer than 150*
b) fewer than 1,500
c) fewer than 15,000
d) none of these
What technology are the Maine biologists using to learn more about
the young salmon?
Of the 400 Atlantic salmon smolts that have been tracked by the
biologists, how many survived the trip out to sea?
On their voyage from stream to sea, where do a disproportionate
number of Atlantic salmon smolts die?
When they enter the salt water.
What environmental problem might explain the answer to #7? N
New England's acid rain.
How far can giant bluefin tuna travel in a single day?
5- 10 miles
b) 10- 15 miles
c) 25- 30 miles*
d) 50 -100 miles
How did Molly Lutcavage and her colleagues find out the answer to
tuna with acoustic transmitters.
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