Squid is actually one of the types of seafood that is perfectly acceptable for pregnant women to eat, so if you are currently with child you will be able to eat squid up to three or four times a week. This is because squid is fairly low in mercury content, especially when compared to many other types of fish like salmon which pregnant women will want to stay away from as much as possible.
Squid contains omega 3 fats which are great for the brain and body, so you will definitely want to include it and many other types of food in your diet on a regular basis. Some of the other types of seafood which you will be able to get lots of regularly include snappers, octopus, prawns, and trevally. As far as sardines and herring is concerned though, you will want to eat them in moderation because they do tend to contain a fairly high amount of mercury.