CFP Aquatic Species Monitoring 2

Question 1

Which sampling gear is most appropriate for monitoring benthic macroinvertebrates in a riffle habitat?

Accepted Answer

Surber sampler

Answer

Surber samplers enclose a defined area of stream bottom and collect drift, making them ideal for benthic macroinvertebrate sampling in riffles.

Question 2

In mark-recapture studies, the Lincoln-Petersen estimator assumes which of the following?

Accepted Answer

Marked individuals mix randomly with the population

Answer

A core assumption of the Lincoln-Petersen method is that marked fish mix randomly with unmarked fish before the recapture event.

Question 3

Passive integrated transponder (PIT) tags are preferred over anchor tags for long-term individual identification primarily because they:

Accepted Answer

Are readable without recapturing the fish

Answer

PIT tags can be detected by antennae at fish passages or with handheld readers without physically recapturing the animal.

Question 4

A crew electrofishing a warm-water stream sets the output to 60 Hz pulsed DC. What is the primary purpose of using pulsed rather than continuous DC?

Accepted Answer

Reduce injury to fish while maintaining galvanotaxis

Answer

Pulsed DC induces galvanotaxis while reducing the duration of electrical exposure, lowering fish mortality and injury compared with continuous DC.

Question 5

Which index is most commonly used to assess fish community integrity relative to reference conditions in wadeable streams?

Accepted Answer

Index of Biotic Integrity (IBI)

Answer

The IBI scores multiple fish community metrics against reference-site benchmarks to evaluate overall biological condition.

(CFP) Certified Fisheries Professional Practice Test