Oh your salad can be filling. I did low carb vegetarian for years. Compared to that, pescatarian would be a breeze.
Fresh water fish, ocean fish, oily fish, shell fish, crustaceans, etc. There are plenty of island cultures where their protein comes almost exclusively from shellfish.
Obviously you would have to like fish. Which would be my main issue.
And fish bones soften quite quickly when you make broth, so the bones are easy to eat.
However, I couldn't be pescatarian. This is a middle north, land locked state. The idea of fresh seafood is a joke.