Fish

Videos: media type="custom" key="8698646" Clip 1: Giant River Sting Rays Being Found Cite: [] media type="custom" key="8698810" Clip 2: Large Sharks Sruggling to Live Cite: []

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Article: [] Citation: "Sentinelsource: Millions of fish die after oxygen levels plummet at a California harbor." //Sentinelsource//. N.p., 14 Mar. 2011. Web. 14 Mar. 2011. Information:

Body Structure: Body Function: Reproduction:
 * Bony or Cartilaginous skeleton
 * Paired Fins: used for swimming or steering
 * Thin bony plates are scales
 * Jaws: used for crushing and gnawing food
 * gills for breathing
 * Two-chambered heart
 * Ectohermic- cold-blooded
 * Swim bladder- an air sac used to control the depth in water
 * Countershading- dark on dorsal side, light on vertral; used for camouflage
 * Lateral line- canals on side of body; used to pick up vibrations
 * Exteranl Fertilization
 * Spawning: females lay many eggs
 * External development in aquatic egg

Classes
 * Agnatha
 * Jawless
 * Suck blood from other fish
 * Skeleton is made from cartilage
 * Ex: Lamprey
 * Chondrictyes
 * Jaw is present
 * Skeleton made of cartilage
 * Ex: Sharks, Skates, and Rays
 * Oseicthyes:
 * Have bones
 * Ex: Perch, Musky, Tuna