CARTILAGINOUS FISH Bony vs Cartilaginous Fish Bony fishes

CARTILAGINOUS FISH

Bony vs. Cartilaginous Fish Bony fishes - Have bones! Cartilaginous fishes - Have cartilage! - Lighter than bone can float and swim more easily - Very tough and strong

Characteristics Placoid Scales (dermal teeth) - Jaw: lost when they become worn, replaced by rows of new teeth behind

Characteristics Gills and Spiracles - Pump water into gill chamber, then released through gill slits = no mud! Two Classes - Elasmobranchs: 5 gill slits, one spiracle, dermal teeth, upper jaw not firmly attached to skull (sharks, rays, skates) - Chimeras: one gill opening, tooth plates, skull with a firmly attached jaw

Characteristics No swim bladder - Must continuously swim or they will sink!

Characteristics Oviparous (egg-layers) vs. ovoviviparous (hatch within, birth live young)

Characteristics - Senses Ampullae of Lorenzini - Electromagnetic sense Lateral Line - Can detect changes in vibration/pressure

Fun Facts 8 families of stingrays - Sixgill stingrays - Deep water stingrays - Stingarees - Round rays - Whiptail stingrays - River stingrays - Butterfly rays - Eagle rays

Fun Facts 600+ species of rays worldwide Commonly found in tropical and subtropical waters, some species in freshwater rivers

Fun Facts Barbed, venomous stingers

Fun Facts

Gallery Exploration Obs-RAY-tion sheets