In my saltwater ecosystem, I included sharks, a stingray, fish, a sea turtle, an eel, an octopus, a coral reef, ocean plants, and a seal on top of the water. All of the sea animals and plants depend on each other in some way. They all need the salt water to live. We also depend on them for food. A ton of little fish live in the coral reefs and plants.  The plants, sand, saltwater, and animals all make up a saltwater ecosystem.

My information is from the internet. That is where I got the pictures too. Click on my photo to see my diorama full-size.