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Agnatha: Lack a Jaw and Paired fins Skeleton is Cartilaginous They have seven or more paired gills
Chondrichthyes: They mainly live in marine areas, but some live in freshwater Chondricthyes all are made up of cartilaginous skeleton They all have pectoral fins
Osteichthyes: They are characterized by a relatively stable pattern of cranial bones Bony fish usually have swim bladders, which creates a neutral balance
between floating and sinking Most have smooth overlapping scales that are ganoid, cycloid, and ctenoid
Characteristics
Fish is able to eat a wide variety of food.
The food is broken down by the esophagus
The food is further digested in the stomach
The liver and pancreas add enzymes and chemicals
The intestine completes the tract.
Digestion
Fish get oxygen from the water not the atmosphere
Fish use gills to breathe
Gills are protected under the operculum
Oxygen is absorbed by a thin membrane which covers the gills
At the same time carbon dioxide is being released from the blood
Respiration
Closed Circulatory System
Heart Pumps in a single loop
From the Heart to Gills
From the Gills to the rest of the body
From the body back to the heart
Two-chambered heart.
Internal Transport
Small brain to body size
Sharks has large brains
Fore Brain
Mid Brain
Hind Brain
Brain Stem
Response
Spawning
Females lay eggsReproduction
Males Fertilize
Seed is milt or soft roe
Most species spawn in the same place
Reproduction
Catfish have 27,000 taste buds (humans have 7,000)
There are over 30,000 species of fish
Tuna fish can swim up to 43 mph
Over 1,000 fish threatened by extinction
Sharks and Rays do not have swim bladders.
Facts:
http://www.ecomare.nl/en/encyclopedia/organisms/animals/fish/fish-biology/reproduction-of-fish/
http://en.wikipedia.org/wiki/Fish#Excretionhttp://facts.randomhistory.com/fish-facts.htmlhttp://en.wikipedia.org/wiki/Osteichthyeshttp://en.wikipedia.org/wiki/Chondrichthyeshttp://en.wikipedia.org/wiki/Agnathahttp://vertebrates.voices.wooster.edu/chondri
chthyes/
Sources