Fish

Question 1

What are the different types of scales and examples of fish with them?

Answer 1

Placoid – elasmobranchs
Cosmoid – lungfish/coelacanths
Gandoid – sturgeons, paddlefish
Ctenoid/Cycloid - teleosts

Question 2

Label a fish and its fins

Answer 2

Anal fin
Caudal peduncle
Caudal fin
Lateral line
Dorsal fin
Operculum
Mouth
Pectoral fin
Pelvic fin
DORSAL
ANTERIOR
VENTRAL
POSTERIOR

Question 3

What are the function of the specific fins?
Dorsal
pectoral
pelvic
anal
adipose

Answer 3

• Dorsal – balance/stabilization, sudden direction changes
• Pectoral – paired fins, directional changes, aid swimming and directional changes
• Pelvic – deceleration (brakes)
• Anal – stabilization
  adipose fin- a precaudal flow sensor?

Question 4

Shapes of fins and their roles?
rounded
truncated
emarginated
forked
lunate

Answer 4

Rounded – effective acceleration/maneuvering, but high drag, not found in fish that swim
long distance
* Truncated – straight edge, effective for rapid turning and short bursts of speed
* Emarginated – low drag, two lobes
* Forked – reduction in turbulence, 2 lobes
* Lunate – maintain high speed, efficient/low drag

Question 5

What are the different types of body shape in fish?

Answer 5

Fusiform
Compressiform
Depressiform
Anguilliform