Locomotion

Question 1

True or false: Friction drag occurs independent of speed.

Answer 1

True

Question 2

Fish that frequently rely on moving at reasonable speeds have evolved to have what type of body shape?

Answer 2

Teardrop

Question 3

What are some adaptations to reduce friction drag?

Answer 3

Having smoother surfaces (skin)
Having limited surface area (including fins)
Mucus production

Question 4

What are some adaptations to reduce inertial drag?

Answer 4

Streamlining body shape (teardrop)
Introduce slight turbulence at high speed

Question 5

What is thought to be the most primitive form of swimming?

Answer 5

Anguilliform (undulation of the whole body - seen in eels)

Question 6

A more efficient method of undulation than anguilliform, performed by most fishes is

Answer 6

Posterior trunk + tail

Question 7

What three special adaptations do high speed fishes tend to have?

Answer 7

1. A narrow caudal peduncle.
2. High aspect tail ratio.
3. Lateral keels

Question 8

Oscillation restricted only to the caudal fin is called

Answer 8

Ostraciiform

Question 9

What is the tradeoff for dominant fin swimmers?

Answer 9

Lower top speed than body undulations but higher maneuverabilty.

Question 10

What are two examples of atypical locomotion?

Answer 10

Gliding and “walking”