Osteichthyes
Jawed fish with skeletons composed of bone
Operculum
Hard plate that covers, protects, and works like a pump to circulate water over the gills.
Cartilage
Lightweight, strong, flexible tissue
Nephrons
Tube like unit that regulate salt and water levels in the body.
Agnathans
Jawless fish, like hagfish or lampreys.
Ventricle
Second chamber of the heart. Pumps blood to the gills to pick up oxygen.
Scale
Hard plate like structure on the skin of most fish.
Gill-Filaments
Finger like projections through which gasses are exchanged.
Chondrichthyes
Cartilaginous jawed fish
Spawning
Type of external fertilization that most fish use, where sperm and egg are released near one another
Single Loop
Type of circulation of blood that fish have
Swim Bladder
Bony fish use this special gas filled sac to stay bouyant
Vertebrae
Individual segments that make up a backbone
Lateral Line
Sensory system that extends along the sides of a bony fish’s body
Lobe Finned
Lone fleshy fins supported by a central core of bones
Atrium
The first chamber of the heart. Pumps blood to the ventricle