Biology 2601A/B Lecture Notes - Lecture 21: Tonicity, Stenohaline, Osmotic Concentration
18 Dec 2015
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Organismal physiology lecture 21: water and salt physiology (part 2): Euryhaline; broad tolerance of salt don"t need animal care. Stenohaline; narrow tolerance of salt tolerant a narrow range in the change of ambient osmoregularity most organisms need to fill out animal care. Hyperosmotic to their marine environment as we are stressed being out in the desert or salt water with very little water around to hydrate. Fish initially colonized the fresh water environment and then the. You need more energy to balance the two natural processes when most of the membranes are permeable. Of completely impermeable no stress if they were less of saline environment close to their own osmolarity there would be no stress. Hyperosmotic to the marine environment so the osmolarity of the marine environment is about 1000 300-400 for the fish. Marine fish are less permeable than freshwater fish have robus scales on them so water will not leak in or leak out of the fish.
