Internal organs of a koi

Gonads: Reproduction Swim Bladder: Buoyancy Kidney: Filters out waste Control Brain: Process Stimuli etc. Gills: Respiration Vent: Serves digestive, urinary & reproductive tracts Heart: Moves blood 'Spleen: Part of the immune system Intestine: Nutrient absorption Liver: Removes toxins, aids digestion * Notice that koi don't M-CASE have a stomach -they only have a long intestine for nutrient absorption.