What is it called when you only eat seafood?

There isn't a single, widely recognized term for someone who only eats seafood. However, you could describe them as:

* Pescatarian: This is a common term for someone who eats fish and other seafood, but doesn't eat meat.

* Strict pescatarian: This could be used to emphasize that they only eat seafood and no other animal products.

* Seafood-only diet: This is a descriptive term that clearly explains their dietary choices.

* Ichthyophagist: This is a more technical term that literally means "fish eater".

Ultimately, the best term depends on the context and the specific nuances you want to convey.