4TYPES OF FISHJawless fish: lamprey and hagfishLamprey is a parasite, it attaches toother fish and sucks their bloodHagfish is a scavenger, it lives in theocean and is known for its slimysecretions
Types of Agnathans• Hagfish- Oceanscavengers, not much isknown about them.• Lamprey- fresh and saltwater, they are parasiticand prey on other fish.* Both have cartilaginousskeletons and sucker-likemouths.
Types of Chondrichthyes• Sharks and Rays-have no operculum andmust keep moving tobreathe.• Have different kinds ofscales that feel and lookmore like sandpaper.• Have skeletons made ofcartilage not bones.
Chondrichthyes• Sharks are adapted for a predatorylifestyle.• Cartilage skeletons, stiff pectoral fins(speed).• No operculum, must keep moving tobreathe.• Have live births.• Special scales feel like sandpaper.• Manta, and Sting Rays- live in shallowwater, have mouths located on theunderside, are fairly docile, wide flatbodies and wing-like fins that areflexible.
14SHARKS*The pectoral fins of sharks do notmove* Sharks do not have an operculumor a swim bladder*sharks will sink if they stopswimming
Fish Characteristics• Gills• Backbone (vertebrae)• Paired Fins• Single Loop Circulation• Two chambered heart
Types of OsteichthyesRay Finned:– Most fish are this type– Fins are supported by bonystructures called Rays.– Teleosts are the most advancedform of ray finned fish (symmetricaltails and mobile fins).Lobe Finned:– Fins are long, fleshy, muscular,supported by central core of bones.– Thought to be ancestors ofamphibians.– Examples are: Coelacanth, Lungfish
Fish Adaptations• Lateral Line System- used to detectvibrations, orient the fish in water, it is a lineof cells running down the side of the fish.• Operculum- gill cover, movement ofoperculum allows more water to be drawn in.• Swim Bladder- a gas filled sac that helpsthe fish maintain buoyancy. Sharks don’thave a swim bladder!• Fins- Dorsal, Caudal, Pectoral, Pelvic, Anal.
Fish Respiration• Water flows over Gills as fishopens mouth and swims.• Water flows opposite direction ofblood flow.• O2 diffuses from the water intothe blood.• Gills are made of thousands ofgill filaments.• Gills are covered by theOperculum.
Fish Circulation• Fish heart has 2 chambers• Single loop circulation• Blood flows into gills, picks up O2, goesto the body, returns to the heart.
Fish Reproduction• Most Fish reproduce sexually, and fertilizetheir eggs externally (Sharks-internally).• Spawning is the process of fertilizing eggs.• Baby fish are called FRY.
40The puffer fish uses air to expand its bodyto look intimidating to predators
41Fugu (Japan): Despite precise preparation by specially qualifiedchefs, this toxic puffer fish delicacy kills people every year.Theemperor of Japan isnt allowed to eat fugu lest it be his lastmeal. For all that work and risk, it still tastes like fish, but manypeoplerespect the chefs.
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