General terms:
* Marine life: This is the most common and general term, encompassing all living organisms in the ocean.
* Ocean animals: Similar to "sea animals", but emphasizes the ocean environment.
* Sea creatures: This is a poetic and informal term.
* Aquatic animals: A broader term that includes freshwater animals as well.
More specific terms:
* Marine fauna: This is a scientific term referring to all animal life in the ocean.
* Sea mammals: This refers specifically to mammals that live in the ocean, like whales, dolphins, and seals.
* Fish: This refers specifically to aquatic vertebrates that breathe through gills.
* Invertebrates: This refers to animals without a backbone, like jellyfish, crabs, and sea stars.
The best word to use depends on the specific context and what you are trying to convey.