I know the basics of a pescetarian diet, but saw a recipe w/ fish and chicken stock, would the stock be okay?

I'm just starting the diet when I move out of the house and only just learned of it. Help?
Update: This is the recipe: http://m.allrecipes.com/recipe/12816/cioppino it just has me really confused considering this is a for of vegetarianism and a few said the stock would be okay and others said to instead use veggie stock... so.
4 answers 4