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What is osmoregulation in fish?

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Osmoregulation in fishes:

  1. Osmoregulation is a subtype of homeostasis during which water volume and electrolyte content are both maintained.
  2. It is the active monitoring of the osmotic pressure of an organism's bodily secretions, as measured by osmoreceptors.
  3. Organisms must maintain the correct balance of solutes and water in their body fluids in both aquatic and terrestrial contexts.
  4. In comparison to its aquatic environment, the body fluid of freshwater fish is frequently hyperosmotic.
  5. The osmotic gradient, which is created by hyperosmotic body fluid, causes them to swell by the entry of water into their bodies.
  6. It the aimed at maintaining fluid and electrolyte balance within a cell or organism in the environment by regulating water potential.
  7. Osmoregulation is vital for animals in biology since this allows them to maintain a consistent, appropriate osmotic pressure within their bodies or cells.
  8. Osmoregulation means the physical systems that ensure consistent concentration of cell membrane-impermeable elements and ions in the fluid that surrounds cells.
  9. Fish employ osmoregulation to combat diffusion and osmosis and maintain the internal salt and water balance that is required for their efficiency and survival, regardless of the salinity of their external environment.

Osmoregulation in freshwater fishes:

  1. Freshwater fishes are hypertonic to their surroundings, which implies that their blood has a higher salt concentration than the water around them.
  2. These fishes use their mouths and gill membranes to take in a controlled amount of water.
  3. They drink a lot of water, which causes them to produce large quantities of urine, which causes them to lose a lot of salt.
  4. The mitochondria-rich cells in the gills assist in replacing the salt from the surrounding water and absorbing it into the blood.

Osmoregulation in marine fishes:

  1. Marine fishes encounter the opposite problem as compared to freshwater fishes.
  2. In comparison to their surroundings, they have blood that contains more water and as a result, there is a propensity to lose water and absorb the salt.
  3. Marine fishes limit their urination and drink a lot of water to counter this problem.
  4. The marine fishes must actively eliminate salt from their bodies, which results in another additional energy expenditure.

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