How does salinity affect fish species?



  1. 0 Votes

    Freshwater fish and saltwater fish have simply evolved differently to adapt to their environments over time. Freshwater fish have “physiological mechanisms that permit them to concentrate salts within their bodies” while saltwater fish do not have this mechanism.

  2. 0 Votes

    Salt in the water affects the concentration of water inside the cells of animals. It is part of the phenomenon of diffusion. Water molecules will go from areas of high concentration to low concentration in attempts to reach an equilibrium. It is the same for humans too. This is why we cannot drink sea water. The saltiness of the water attracts more water molecules because water is less concentrated there, which ends up pulling water out of the cells. If the cell loses too much water, the cell will die from dehydration.

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