Sweat glands
The kidneys.
kidney
the large intestine
they try to waggle their tail and wallow themselves in pool of water thus releasing excess heat
Kidney
A valvelike organ that allows it to eject water in a concentrated stream.
Pyrosomes filter feed by taking in water and using the mucous to capture plankton and other particles then releasing the excess water.
The organ structure glomerulus allows the passage of waste products and some water and salt.
The kidneys filter unwanted waste, minerals, excess water from the blood.
The organ that holds and releases air which allows the perch to move up and down in the water is the swim bladder. Most fish have this organ, which they use to control how deep or how shallow they swim.
Urinary system
No single organ 'stores' food. Food flows throgh the digestive system, entering the mouth and exits the booty.