Fishes.

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Presentation transcript:

Fishes

What is a fish? Aquatic vertebrates that have paired fins, scales, and gills. Of course there are exceptions  There are approx. 24,000 living species

Questions What is the function of fins? What is the function of scales? What is the function of gills?

Groups of Fishes Jawless Fishes Cartilaginous Fishes Bony Fishes

Jawless Fishes Agnantha – means without jaws Includes: lamprey & hagfish http://www.britannica.com/EBchecked/topic/9280/agnathan http://www.youtube.com/watch?v=NYRr_MrjebA

Cartilaginous Fishes Chondrichthyes – means cartilage fish Includes: sharks, rays, skates, sawfishes and chimaeras

Bony Fishes Osteichthyes – means bone fish Skeletons of these fishes are made of a hard calcified tissue – called bone 2 groups within bony fishes Ray-finned fishes Lobe-finned fishes

Ray Finned Fishes Most bony fishes are ray-finned Refers to the slender bony spines or rays that form the fins (like a fan)

Bony Fishes

Ray-finned Fishes

Fish Ecology What is ecology? Some fishes like salmon spend most of their lives in the ocean but migrate to fresh water to breed. These fishes are called anadromous

Fish Ecology 2.0 Some fishes live in fresh water but migrate to the ocean to breed. These fishes are catadromous ie eels

Lobe-finned Fishes Only 7 living species Fleshy fins – still have bones (big bones) Some bones are jointed like the arms and legs of land vertebrates!!!!

Survival Techniques - Feeding Every mode of feeding is seen in fishes. Some fishes will eat whatever is available at the time Fishes have different adaptations to help them get their food

Survival Techniques - Respiration What structure do fishes use for gas exchange? What of the 4 structures that all chordates have did this structure evolve from?

Reproduction Eggs are fertilized either externally or internally depending on the species. Fishes whose eggs hatch outside the mother’s body are oviparous. Ovoviviparous species keep eggs inside – eggs hatch and young is “born alive” A few species including sharks are viviparous. What do you think that means?