Adaptations
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Salmon have adapted to saltwater and freshwater so that they can live in the sea, and then swim out of it into the river to have their young. And some of them stay in the estuary because it is safe and that makes a nursery for any living thing, even plants.
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A Mangrove is an amazing tree because it is immune to salt water. It takes all of the salt from the water and puts it into a single leaf and the leaf terns yellow. When there is to much salt in it, the Mangrove sheds the leaf off.
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The Blue Crab is named so because it's limbs are sapphire colored, as you can see in the picture. It eats almost anything, allowing survival in the fluctuation of the availability of certain types of food in an estuary. Unfortunately, the Blue Crab has not adapted to the demand for it's flesh; according to National Geographic, the Chesapeake Bay community in particular has noticed serious declines in Clue Crab population.