An omnivore who excludes poultry, beef, and pork from their diet
but includes fish (and usually
other forms of seafood like shrimp, oysters, scallops, etc.).
to include meat in their diet
(seafood is muscle tissue
from a live animal and therefore meat), they are not vegetarian as vegetarians do not consume meat.
Sally doesn't eat beef, chicken, or poutry
and some other forms of seafood in her diet. She is a pescetarian.