Vert 8 (thermoreg, kidneys, gills)

thermoreg, kidneys, gills

Poikilotherm

same temperature as surroundings

Rete mirabile

prevents heat loss from gills

Opah

extreme thermoreg, pec muscles make heat that circulates thru body

Swim bladder

gas gland excretes lactic acid, O2 diffuses from blood into bladder

Physostomus fish

swim bladder/esophagus connected, gulp/burp air

Physoclistous fish

dependent on gas gland for bouyancy

Chondrichthyes

large liver full of squalene (oily lipid)

Osmoregulator

keep internal environment in narrow range

Freshwater fish

hyperosmotic- keep solutes in fish, remove water

Saltwater fish

hypoosmotic- keep water in fish, remove solutes