By: Jason Burmeister

Class Agnatha, Chondrichthyes,

Osteichthyes(Sharks, Rays, Bony Fish)

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

KidneySwim BladderGonads Intestines StomachLiverHeartGillsBrainSpinal ChordSpineMuscleVent

Anatomy

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

Waste is released as ammonia

Gills

Kidneys

Saltwater Fish loose water

Special Kidneys

Excretion

Small brain to body size

Sharks has large brains

Fore Brain

Mid Brain

Hind Brain

Brain Stem

Response

Exerting force

Achieved by contracting muscles

Flexion

Vector Forces

Lateral Movement

Movement

Spawning

Females lay eggsReproduction

Males Fertilize

Seed is milt or soft roe

Most species spawn in the same place

Reproduction

Examples:

Agnatha:

Chondrichthyes:

Osteichthyes:

Hag Fish

Great White Shark

Yellow Fish Tuna Fish

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