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Difficulty: MediumResolving Paradoxes and Apparent Discrepancies

In 2025, a coastal region designated a 50-mile marine sanctuary where commercial fishing was strictly prohibited, aiming to restore depleted populations of yellowtail snapper. Over the following two years, biological surveys confirmed a marked increase in the adult yellowtail snapper population within the sanctuary. Paradoxically, during the same period, commercial fishing fleets operating in the unrestricted waters immediately surrounding the sanctuary reported a significant increase in their average daily catch rate of adult yellowtail snapper per vessel, even though total fishing effort outside the sanctuary remained unchanged and no technological upgrades were adopted.

Which of the following, if true, most helps to resolve the apparent discrepancy described above?

  1. A
    The price per pound of yellowtail snapper in local markets declined, prompting commercial fishermen to spend more total hours at sea each day.
  2. B
    Several predatory species that prey upon juvenile yellowtail snapper also established dense populations within the protected boundaries of the sanctuary.
  3. As the yellowtail snapper population inside the sanctuary expanded, large numbers of adult fish naturally migrated into the adjacent unrestricted waters in search of food.Answer
  4. D
    Local environmental protection agencies plan to expand the sanctuary boundaries next year to cover an additional 30 miles of coastal waters.
  5. E
    Prior to the sanctuary's establishment, regional overfishing had driven local yellowtail snapper stocks to historically low levels.

Answer

As the yellowtail snapper population inside the sanctuary expanded, large numbers of adult fish naturally migrated into the adjacent unrestricted waters in search of food.
The correct answer provides a spillover mechanism: as the protected fish population grows and resources inside the reserve become constrained, adult fish migrate into adjacent open waters. This naturally increases fish density in unrestricted zones, enabling fishing vessels to catch more fish per day without changing their equipment or increasing effort.

Step-by-Step Solution

1
Identify the two contradictory premises in the stimulus.
Premise 1: Snapper population inside the sanctuary increased. Premise 2: Daily catch rates per vessel outside the sanctuary also increased despite no changes in fishing effort or technology.
Resolving a discrepancy requires clearly isolating the two facts that appear mutually exclusive.
2
Determine the necessary condition for a valid resolution.
The correct option must introduce a new factor showing how population growth inside the reserve directly leads to higher fish density in open waters.
A valid resolution reconciles both premises without contradicting either stated fact.
3
Evaluate the choices for a bridging mechanism.
The choice describing outward migration of adult fish from the crowded sanctuary into surrounding waters connects the population rise inside to higher catch rates outside.
This 'spillover effect' explains how both empirical trends can occur simultaneously.

Key Concept

Resolving Paradoxes and Apparent Discrepancies
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Topics

Resolving Paradoxes and Apparent Discrepancies

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