However, you can also use "faune marine" which translates to "marine fauna". This is a more scientific and general term for all the animals living in the sea.
Here are some other options:
* "Animaux aquatiques" (aquatic animals) - This is a broader term that includes freshwater animals as well.
* "Poissons et animaux marins" (fish and sea animals) - This is a more specific term that focuses on fish and other sea creatures.
The best option for you will depend on the context of your sentence.