Besides various fish, they also have some lobsters. Apparently when you make the transfer of the lobsters from saltwater to freshwater (which takes about 20 days), they turn blue in color.
We call this one Big Mama. She is loaded down with babies hanging under her tail, so they had to move her to a separate tank. I couldn't believe how many babies she was carrying, literally hundreds. I tried to get a picture of them, but no go.