Buddy BillÕs Bluefin Boats, Inc.

You are the fisheries biologist in a large fishing company.  The Boss comes to you and says, ŅWeÕve been catching 5000 fish per year.  But the population is 100,000 fish.  Surely we can increase the harvest to 7000 per year.  WeÕd make more money, if we could sell more fish!  Before we do, though, I want you to determine what effect it will have on the population.  Figure it out—use the same rules as always: we only catch adults, so the young will be able to restore the population.  Get back to me this afternoon.Ó

YouÕd better figure this out...

Bluefin have a 30 year lifespan.  It takes them 6 years to reach maturity.  LetÕs estimate that 6/30 are immature, and 24/30 are mature adults.  Out of a population of 100,000, how many adults are there?

Before, we harvested 5000 adults per year.  After catching them, how many adults were left in the population?

In any given year, the adult fish reproduce, giving about 10% as many new fish as there are adults.  Therefore, how many new fish do we get from this population (after harvest)?

This was more than we were harvesting.  No wonder it worked so well year after year.

What if we harvest 7000 adults per year?  After catching them, how many adults will be left in the population?

With the same reproduction rate as before (new fish Å 10% of the number of adults), how many new fish will there be after catching 7000 adults?

Is this more, or less than the 7000 The Boss wants us to catch?

What should you tell The Boss this afternoon?

Old RedÕs Orange Roughie OpeRation

You are the fisheries biologist in a large fishing company.  The Boss comes to you and says, ŅWeÕve been catching 5000 fish per year.  But the population is 100,000 fish.  Surely we can increase the harvest to 7000 per year.  WeÕd make more money, if we could sell more fish!  Before we do, though, I want you to determine what effect it will have on the population.  Figure it out—use the same rules as always: we only catch adults, so the young will be able to restore the population.  Get back to me this afternoon.Ó

YouÕd better figure this out...

Orange Roughie have a 30 year lifespan.  It takes them 12 years to reach maturity.  LetÕs estimate that 12/30 are immature, and 18/30 are mature adults.  Out of a population of 100,000, how many adults are there?

Before, we harvested 5000 adults per year.  After catching them, how many adults were left in the population?

In any given year, the adult fish reproduce, giving about 10% as many new fish as there are adults.  Therefore, how many new fish do we get from this population (after harvest)?

This was more than we were harvesting.  No wonder it worked so well year after year.

What if we harvest 7000 adults per year?  After catching them, how many adults will be left in the population?

With the same reproduction rate as before (new fish Å 10% of the number of adults), how many new fish will there be after catching 7000 adults?

Is this more, or less than the 7000 The Boss wants us to catch?

What should you tell The Boss this afternoon?

Congressional Legislation

UN Resolution 1911 would be an internationally-binding restriction on Orange Roughy fishing, reducing the catch to 10% of its current level.  Do you vote to support UN Resolution 1911, to change it, or to reject it?

Person #1.  You are a member of Congress, and will vote on this issue.  You must weigh the arguments of each of the people lobbying for your vote, and then vote appropriately.

What do you need to consider?

The price of fish for the consumer

The loss of jobs

Probability of re-election

The cost of the re-election campaign

Valid scientific data

The health of the economy

PeopleÕs understanding of fisheries biology

PeopleÕs sense of humane treatment of animals

Convincing arguments to support your case if you pass unfavorable legislation

Person #2.  You represent Goliath CorporationÕs Division of Fishing.  Your company has been a leader in the development of efficient fishing techniques and large factory trawlers.  Your companyÕs yearly profits are \$50 million, of which they donate 0.1% to the political party that is least likely to pass restrictive legislation.  ThatÕs \$____________

To avoid accusations of vote-buying, your company also donates 0.02% of their profits to the other party.  ThatÕs \$___________.

Person #3.  You are the spokesperson for the town of Tamarack Point at the mouth of the Ragu River.  This town has, as long as anyone can remember, been a fishing village.  If Resolution 1911 goes into effect, everyone in town will lose their jobs.  YouÕre not voting for anyone who makes you lose your job.

Person #4.  You are a fisheries biologist.