A diet consisting of plant based foods and seafood, with no other meats, dairy or eggs. A vegan who also eats fish. As opposed to a pescetarian, a pescetarian light does not eat dairy or eggs.
"I'm mostly vegan, unless it's $1 oyster night. You might say I'm a pescetarian light."
"I hate to be rude, but I can't eat that lasagna you made for me. As I told you, I don't eat cheese. I'm a pescatarian light."