Fish Exam Study

Question 1

Characteristics of Hagfish:

Answer 1

•1 continuous caudal tail.
•Sub-terminal mouth.
•Direct development (young look like adults).
•Eyes and pineal are absent.
•Lateral line is absent.
•1-16 gill openings.
•Tongue for biting and tearing.
•Spawn few large eggs.
•Marine.
•Mainly scavengers.

Question 2

Characteristics of Lampreys:

Answer 2

•1 or 2 dorsal fins.
•Terminal mouth.
•Ammocoete larva.
•Functional eyes and pineal.
•Lateral line present.
•7 gill openings.
•Tongue for rasping and suction.
•Many small eggs.
•Freshwater or anadromous.
•Filter feeding or parasitic.

Question 3

How are sharks buoyant?

Answer 3

•Streamlined.
•Cartilaginous skeleton.
•Large liver - squalene.
•Scales - denticles.
•Paired fins present.

Question 4

Characteristics of Cartilaginous fish:

Answer 4

•Marine.
•Endoskeleton made of cartilage.
•Covered in placoid scales.
•Sub-terminal mouth.
•5-7 gills.
•Squalene filled liver for buoyancy.
•Heterocercal tail fin.

Question 5

Characteristics of Bony fish:

Answer 5

•Freshwater and marine.
•Endoskeleton made of bone.
•Scales can be ganoid, cycloid, or ctenoid. Can be scaleless.
•Air bladder for buoyancy.
•Homocercal tail fin.