FIsh

Vertebrates

Phylum Chordata Subphylum: Vertebrata
 * All chordatres exhibit the following four chareacteristics at some time in their life!
 * 1) Notochord
 * 2) Dorsal Nerve Cord
 * 3) Pharyngeal Pouches
 * 4) Postanal Tail
 * Vertebrates belonging to phylum Chordata
 * Have vertebral Column Protecting the dorsal nerve cord
 * Bilateral symmetry
 * Endoskeleton
 * Efficient respiratory system
 * Closed circulatory system
 * Nervous system with complex brain and sense organs

Examples of vertebrates
 * 1) Fish
 * Jawless fish
 * Cartilaginous fish
 * Bony fish
 * 1) Amphinians
 * Salamanders
 * Toads
 * Frogs

3. Reptiles
 * Tutles
 * Crocodiles
 * Lizards
 * Snakes

4.BIrds 5.Mammals

Fish Charecteristics Body Function Reproduction - Spawning:females lay many eggs
 * Bony or cartilaginous skeleton
 * Paired Fins: used for swimming, steering
 * Scales- thin body plates
 * Jaws:used for crushing and gnawing food
 * GIlls for breathing
 * two-chambered heart
 * Ecototherms (Cold blooded)
 * Swim bladder-air sac used to control depth in water
 * Countershading-dark on dorsal side, light on ventral; used for camouflage
 * Lateral line-canals on side of body; used to pick up vibrations
 * External fertilization
 * External development in aquatice egg

Fish Classification
Class Agnatha
 * Jawless fish
 * Example: lampreys
 * Suck blood from other fish
 * Skeletons made of cartilage

Class Chondricthyes Class Osteicthyes:
 * Jaws present
 * skeletons mad of cartilage
 * Ex. Sharks, skates, and rays
 * Bony fish
 * Ex. Perch, musky, tuna, catfish, bluegill, etc.
 * Most numerous species of all fish classes