How do freshwater fish excrete waste?

How do freshwater fish excrete waste?

Fish have two kidneys. The head kidney filters out wastes that go through the gills, while the posterior kidney filters wastes that go out the urinary pore. In freshwater fish, the kidneys save ions and excrete water.

How is Osmoregulation different in marine fish versus freshwater fish?

An example is freshwater fish. Water will diffuse into the fish, so it excretes a very hypotonic (dilute) urine to expel all the excess water. A marine fish has an internal osmotic concentration lower than that of the surrounding seawater, so it tends to lose water and gain salt.

Why do marine fishes excrete concentrated urine?

Marine fishes contain less salt concentration than the surrounding water, which causes water to leave the fish via osmosis. This great loss of water causes their urine to become concentrated.

What is excretion in fish?

Marine fishes must conserve water, and therefore their kidneys excrete little water. Most nitrogenous waste in marine fishes appears to be secreted by the gills as ammonia. Marine fishes can excrete salt by clusters of special cells (chloride cells) in the gills.

Do fishes excrete faeces?

Fish pee and poo through their gills and skin. Some also pee and poop through a small opening known as a pore, located at the body’s rear end.

Why fresh water fishes excrete dilute urine and marine fishes excrete concentrated urine?

Because of the large water intake, urine is dilute. Marine fishes tend to lose water to their surroundings because their bodies are less salty than the surrounding water. Their kidneys produce small amounts of concentrated urine to conserve water.

What is the difference between freshwater and marine water?

Typically, freshwater habitats are less than 1 percent salt. Marine life, however, has to be adapted to living in a habitat with a high concentration of salt. Freshwater habitats include ponds, lakes, rivers, and streams, while marine habitats include the ocean and salty seas.

What are 2 differences between freshwater and saltwater?

The difference between Salt Water and Fresh Water is that the saltwater is mainly present in the oceans and seas, and the salinity of the water is very high, which is unfit for human consumption while in contrast, freshwater is mainly present in the rivers, lakes, wells, streams, ponds, etc.

Do freshwater fish excrete concentrated urine?

Freshwater fish will passively intake water from their environment and then, as their insides are saltier than their surroundings, will excrete a diluted urine. Saltwater fish have to drink water more actively and, as their surroundings are saltier than their insides, will expel a more concentrated urine.

How does fish excretion occur?

To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt. Most nitrogenous waste in marine fishes appears to be secreted by the gills as ammonia. Marine fishes can excrete salt by clusters of special cells (chloride cells) in the gills.

What makes a freshwater fish different from a marine fish?

Freshwater fishes, on the other hand, live in water with a much lower concentration of salts than they require inside their bodies. Osmosis tends to promote the loss of water from the body of a marine fish and absorption of water by that of a freshwater fish.

Why do freshwater fishes excrete so little salt?

Freshwater fishes drink very little water and take in little water with their food. Marine fishes must conserve water, and therefore their kidneys excrete little water. To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt.

Where does the excretion take place in a fish?

Excretion and secretion control are closely related and in fish it is done through the gills and kidneys. Although gills are the main respiratory organ, they also act as an important excretory and osmoregulatory organs. The kidneys play an important role in removing nitrogenous wastes and maintaining water-salt balance (homeostasis).

How does a marine fish maintain its water balance?

To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt. Most nitrogenous waste in marine fishes appears to be secreted by the gills as ammonia. Marine fishes can excrete salt by clusters of special cells (chloride cells) in the gills.