An examination of a marine sea star that had died after it was mistakenly placed in freshwater would likely show that it died because its kidney had ruptured.
Osmoregulation is the process of retaining an inner balance of salt and water in a fish's frame. A fish is, after all, a set of fluids floating in a fluid environment.
Osmoregulation by kidney is a fundamental system of living structures, equivalent in significance to breathing, digestion, or reproduction. Osmoregulatory techniques are people who allow a fish to maintain its mobile fluid composition and quantity.
As an alternative, they skip quite a few very dilute urines, and they acquire electrolyte stability by way of active transport of salts via the gills. once they pass to a hypertonic marine environment, those fish begin ingesting sea water they excrete the extra salts thru their gills and their urine.
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