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11.2 (Fish (most are ectotherms, obtain oxygen through gills, uses fins to…
11.2
Fish
most are ectotherms
obtain oxygen through gills
uses fins to move
closed circulatory system system
have scales
most have external fertilization
others (sharks and guppies) have internal fertilization make up the largest group of vertebrates
Major groups of fish
Jawless
no jaws
no scales
skeletons made of cartilage
Cartilaginous fish
have jaws
have scales
skeletons made of cartilage
skin has a sandpaper texture
usually carnivores
bony
has scales
skeletons made of hard bones
has jaws
a pocket on each side of the head that holds the gills
has a swim bladder that helps the fish stay stable at different water depths
make up 95% of all fish species