Ocean Fishes Practice Quiz 2025

What is the name of the internal structure that controls a bony fish's depth in the water?

• Liver

• Air Pocket

• Lung Bladder

• Swim Bladder

What does the fish class name "Agnatha" mean?

• Jawless

• Cartilage fish

• Bony Fish

• Toothy

Egg case of a shark or skate

• parthenogenesis

• mermaid's purse

• ovoviviparous

• viviparous

Any of the bony, overlapping plates that protrude from a fish's skin.

• roe

• scale

• gills

Cartilage is different from bone because

• It's more flexible

• It's lighter

• Both answers are correct

Which fish class would a lamprey be classified in?

• Chondrichthyes

• Agnatha

• Osteichthyes

• Amphibia

Identify Fish B

• Trumpetfish

• Queen Parrotfish

• Spotted Unicornfish

• Clown Triggerfish

• Woodpecker

What fin is found at the posterior region of a fish and is responsible for moving the fish forward?

• pelvic fins
• pectoral fins
• caudal fin
• dorsal fin

This structure is used to detect vibrations in the water.

• olfactory sacs

• nictitating membrane

• lateral line

• spiracles

What structure is represented by letter I?

• bile duct

• spiral valve

• spleen

• rectum