Please check out this small restuarant if you are near the Central Market! The seafood is fresh, the staff friendly and the prices very reasonable. We ate there several times on our visit and were not disappointed at all! The ceviche is excellent and my wife liked it so much that they kindly supplied her with their own recipe to take back home to Canada!The biggest problem ,as mentioned before, is finding the place as its not actually in the Central Market....we had difficulty even with my wife fluent in Spanish. So, to help other travellers....it is across the road from the Central Market in a kind of mini market. If you find where Avenue 1 crosses with Calle 2( which is one corner of the Central Market ) then look for the sign of a souveniers shop " Souveniers Sanabria "( which is on the Avenue 1 side of the Central Market) and directly across the road is the mini market where you will find the Mariscos Poseidon. Hope this helps....enjoy!