CFP Fish Population Dynamics & Stock Assessment Flashcards

Which statistical method is commonly used to estimate population size using mark-recapture data?

Answer: Chapman modification of the Lincoln-Petersen estimator

The Chapman modification of the Lincoln-Petersen estimator is a standard mark-recapture formula used to estimate closed population size.

In fisheries, what does the term 'F_MSY' represent?

Answer: The fishing mortality rate that produces maximum sustainable yield

F_MSY is the level of fishing mortality at which the stock produces its maximum sustainable yield.

What is an age-structured population model primarily used for in fisheries management?

Answer: Projecting future population size and yield under different harvest scenarios

Age-structured models project how fish populations will change over time under various fishing pressures by accounting for survival and growth by age class.

What is the primary purpose of a spawning stock biomass (SSB) reference point?

Answer: To set a threshold below which the reproductive capacity of the stock may be compromised

SSB reference points define a minimum reproductive biomass level needed to maintain adequate recruitment and long-term stock viability.

Which tool is widely used by US federal fisheries scientists to conduct integrated stock assessments?

Answer: Stock Synthesis (SS3)

Stock Synthesis (SS3) is an age- and length-structured statistical stock assessment model widely used by NOAA and other US fisheries agencies.

What does a high natural mortality (M) estimate imply about managing a fish stock?

Answer: The stock can sustain higher exploitation rates because it has a fast population turnover

Species with high natural mortality tend to have short life spans and fast reproduction, allowing them to sustain higher fishing pressure than slow-growing, long-lived species.