CFP Field Survey & Data Collection 4

Question 1

A biologist needs to sample fish in a small, turbid stream where electrofishing is ineffective. Which passive gear is most appropriate?

Accepted Answer

Minnow traps baited with cat food

Answer

Baited minnow traps are effective in small streams and do not require water clarity or electrical access.

Question 2

When conducting a visual snorkel survey for salmonids in a clear stream, the biologist should move in which direction?

Accepted Answer

Upstream against the current

Answer

Moving upstream prevents silt disturbance from reaching the survey area ahead and keeps fish facing the observer naturally.

Question 3

The primary purpose of a fish passage survey at a culvert is to:

Accepted Answer

Determine whether the structure creates a barrier to fish movement

Answer

Fish passage surveys evaluate whether culvert outlet drop, velocity, or depth prevents upstream fish migration.

Question 4

In a population mark-recapture study, which condition would cause the Lincoln-Petersen estimate to be negatively biased (underestimate true population size)?

Accepted Answer

Marked fish have higher catchability than unmarked fish

Answer

If marked fish are easier to catch, the recapture sample overrepresents marks, inflating the marked fraction and lowering the population estimate.

Question 5

A biologist wants to assess the temperature regime of a stream without continuous monitoring. Which approach provides the best temporal resolution at low cost?

Accepted Answer

Continuous recording with inexpensive data loggers (iButtons or HOBO loggers)

Answer

Continuous data loggers record temperature at programmed intervals and capture diel and seasonal variation inexpensively.

(CFP) Certified Fisheries Professional Practice Test

(CFP) Certified Fisheries Professional Practice Test

CFP Field Survey & Data Collection 4