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Form and Function in Fishes

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by

Katelynn Dorn

on 11 April 2014

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Transcript of Form and Function in Fishes

30-2 Fishes
Form and Function in Fishes
feeding- any mode of feeding can be observed in fish
pyloric ceca- secrete enzymes and increase absorption
respiration- gills
made of filaments
contain fine capillaries for exchange of O2 and CO2
several gill openings vs. one
lungfish
circulation- closed circulatory system
one loop
heart has 4 parts: sinus venosus, atrium, ventricle, and bulbus arteriosus
Form and Function in Fishes (cont.)
Excretion- diffusion/kidneys
salt water vs. fresh water fishes
Response
Brain: olfactory bulb/cerebrum/optic lobes/cerebellum/medulla oblongata/spinal cord
lateral line system- detects vibrations in water
Movement- alternate contracting muscles to swim
fins stabilize fish
streamlined body reduces drag
gas-filled swim bladder
Reproduction- internal or external
oviparous- eggs hatch outside mother's body
ovoviviparous- eggs fertilized in mother's body then born, use yolk for nourishment
viviparous- eggs fertilized in mother's body then born, obtain nutrients from mother's body
Groups of Fishes
Jawless fishes- lampreys, hagfishes
Sharks and their Relatives- (Chondrichthyes) sharks, rays, sawfishes
Bony Fishes- (Osteichthyes) ray-finned and lobe-finned
Ecology of Fishes
Anadromous fishes- born in rivers/streams, mature in sea
salmon recognize home stream by sense of smell
Catadromous- lives in rivers and streams, lays eggs in ocean
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