IB ESS HL 4.3.12 Fish Stock Assessment Question Bank

Interpret data used to assess fish stocks and sustainable harvest.

Exam points

identify the aquatic-system process or pollution indicator
apply the relevant conservation, quality or management model
evaluate ecological and human trade-offs from evidence

[Maximum number: 1]

Figure Global trends in the world's marine capture fishery stocks, 1974-2019

Using Figure, calculate the percentage difference between the marine capture fishery stock considered overfished in 1974 and 2019.

\begin{aligned} & (1974=10 \% \\ & 2019=35 \% \\ & 35 \%-10 \% \text { or } 90 \%-65 \%)=25(\%) ; \end{aligned}

Note to examiners: Working and "\%" are not required for full credit.
Because "percentage difference" is ambiguous, credit may also be given if candidate carried out the following working:
$((35-10) \times 100 / 10=) 250(\%)$

All question bank results loaded

4.3.12 (HL)—Fish stock assessment question 1