Will make a desalination plant is set up in a bay to provide fresh, drinkable water by removing salt from ocean water and returning the removed salt to the bay. how might the resulting increase in salinity in the bay affect the fish populations? temperatures would decrease making a more suitable environment for fish populations. the food sources available to the fish populations would increase low levels of dissolved oxygen would decrease the diversity of fish populations. fish populations of all the species already living there would increase.