Yes, as long as the food was kept at a proper temperature after cooking, and didn't sit around on the countertop for more than 2 hours or wasn't left in the fridge for a number of days. But the...
A seafood salad recipe normally has shrimp in it. It should also have crab or imitation crab fish, which tastes really good in salads with mayo or cream.
The most common types of sea food found in seafood salad recipes are shrimp and different types of tuna. Sometimes recipes will also call for something more exotic like crab or lobster.