Bony Fish

What is the approximate number of bony fish species?

• Over 15,000 species

• Over 31,000 species

• Over 50,000 species

• Over 60,000 species

What percentage of vertebrates do bony fishes represent?

• About 25%

• About 50%

• About 75%

• About 100%

What is a characteristic feature of the skeleton of bony fishes?

• Made entirely of cartilage

• Made entirely of bone

• Made at least partially of bone

• No skeleton

Where do more than half of all bony fishes spend all or part of their life?

• In freshwater lakes

• In the ocean

• In underground rivers

• In artificial aquariums

What is the dominance status of bony fishes in the ocean?

• Minor vertebrates of the ocean

• Dominant invertebrates of the ocean

• Dominant vertebrates of the ocean

• Nonexistent in the ocean

What type of scales do bony fishes have?

• Placoid

• Ganoid

• Cycloid or Ctenoid

• None of the above

What are cycloid scales characterized by?

• Tiny spines on the border

• A smooth surface

• Being made of skin

• Protective mucous

What is the function of an operculum in bony fish?

• To provide a smooth surface

• To protect the gills

• To cover the body with scales

• To produce mucous

What are ctenoid scales known for having?

• A smooth surface

• Tiny spines on the border

• A layer of skin

• A protective mucous

What are scales made of in bony fishes?

• Skin

• Bone

• Mucous

• Tissues