Chapter 39 Fishes Section 3 Bony Fishes.

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Presentation transcript:

Chapter 39 Fishes Section 3 Bony Fishes

Characteristics Class Osteichthyes Bone- harder & heavier than cartridge Lungs- early bony fishes Swim bladder- gas-filled sac that is used to control buoyancy Scales- protect fish and reduce friction when swimming

Lobe-finned fishes Fleshy fins supported by a series of bones Lungfish and coelacanth Lungfish- exchange gas through lungs and gills (Live in tropical ponds) Coelacanth- live deep in the ocean

Lungfish

Coelacanth

Ray-finned fishes Do not have fins with a central bony axis- fins supported by bony-rays Evolved from scales Familiar fish- trout, goldfish, eels, bass, guppies, salmon, perch, etc.

Trout

Perch

Goldfish

External Anatomy Operculum- hard plate that opens at the rear and covers and protects gills Fins- swimming and navigation Caudal fin- tail fin Two dorsal fins (anterior & posterior) Ventral anal fin- helps move in a straight line Pelvic fins- orient body

External Anatomy Skin- scales Scales grow with fish Scales overlap like shingles on roof

Internal Anatomy Skeleton- skull, spinal column, pectoral girdle, pelvic girdle, and ribs Pectoral girdle- supports pectoral fish Digestive: Jaws, pharynx, esophagus, stomach, intestine, liver, gallbladder, pancreas, anus

Internal Anatomy Circulatory- gills, heart, capillaries

Respiratory and Excretory Countercurrent Flow- causes more oxygen to diffuse into the blood Urine Urinary bladder

Swim Bladder Sac filled with oxygen, carbon dioxide, and nitrogen Adjust their buoyancy based on swim bladder

Nervous System Brain Optic tectum- receives and processes information from the fish’s visual, auditory, and lateral-line systems

Reproduction External Lay large numbers of eggs to ensure survival of species Spawning- reproduction Migrate to warm waters to spawn

REVIEW!!! List three key features that characterize bony fishes. Describe the external anatomy of fish. Name the importance of swim bladder.

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