PrepTest 153, Section 1, Question 13

Working the answers

• A

  Farmed fish require certain nutrients, but that doesn't establish different nutritional needs for wild fish. A difference in where fish live isn't evidence of a difference in what their bodies require.

• B

  Catfish, milkfish, and carp require less wild-fish input than the amount harvested. Profit also depends on what the finished fish sell for and other costs. Even if one input were cheaper, we would still need revenue and cost information to compare profitability with salmon.

• C

  Tilapia and channel catfish are presented as alternatives to ocean fish such as cod and haddock. No comparison says farming the two groups causes equal environmental damage. The substitution example doesn't answer this question about damage.

• D
  Correct

  The final sentence says niche markets have begun developing for particular wild-caught fish even as farmed substitutes become available. That supports increasing consumer demand specifically for the wild products. Their preferences help explain why the catch rates remain high rather than falling as farming expands.

• E

  The defense about food consumption concerns predatory carnivores, not noncarnivorous fish. It also doesn't establish this comparison of wild noncarnivores with their farmed counterparts. We can't transfer a claim about one group to another.