CFP Fish Biology & Physiology

Question 1

What is the primary function of the lateral line system in fish?

Accepted Answer

Sensing water pressure changes and vibrations

Answer

The lateral line system detects changes in water pressure, vibrations, and water movement, helping fish sense nearby objects, predators, and prey without visual contact.

Question 2

Which scale types are most commonly found in teleost (bony) fishes?

Accepted Answer

Cycloid and ctenoid scales

Answer

Cycloid and ctenoid scales are characteristic of most modern teleost fishes; cycloid scales have smooth edges while ctenoid scales bear small spines (cteni) on their posterior margin.

Question 3

What is the primary function of the swim bladder in most bony fishes?

Accepted Answer

Regulating buoyancy to maintain depth

Answer

The swim bladder functions as a hydrostatic organ, allowing teleost fish to achieve neutral buoyancy at various depths without expending constant muscular energy.

Question 4

Which physiological process allows marine teleost fish to maintain proper internal ion concentrations while living in saltwater?

Accepted Answer

Osmoregulation

Answer

Osmoregulation allows marine teleosts to balance internal salt and water concentrations by drinking seawater and actively excreting excess ions through specialized chloride cells in their gills.

Question 5

What structural feature of fish gills enables highly efficient oxygen extraction through countercurrent exchange?

Accepted Answer

Blood and water flow in opposite directions across lamellae

Answer

Countercurrent exchange occurs when blood flows in the opposite direction to water across the gill lamellae, maintaining a continuous oxygen concentration gradient that maximizes oxygen uptake efficiency.

(CFP) Certified Fisheries Professional Practice Test

(CFP) Certified Fisheries Professional Practice Test

CFP Fish Biology & Physiology