Just got back. There is no basic seafood but it is incorporated into a lot of the dishes in the Seven Seas Restaurant either starters, soups, or main course.
Nothing you would recognise unless you include smoked salmon, and certainly not fresh. However, the good news is that your stay in Madeira is extended to late evening and right opposite the birth is a selection of truly magnificent Seafood Restaurants, well worth the extra expense for fresh fish and seafood. Have a nice cruis.