The phrase "assorted seafood" is correct and usable in written English.
It can be used to describe a variety of different types of seafood served together, often in a dish or platter.
Example: "The restaurant offers a delicious platter of assorted seafood, including shrimp, scallops, and calamari."
Alternatives: "variety of seafood" or "mixed seafood selection".
Assorted seafood in a lively basil sauce, crowned with fresh basil, was another winner.
The best pick was the cioppino of assorted seafood atop linguine in a tomato-lobster broth.
Tender, crisp and lightly breaded, the assorted seafood and vegetables are fried to perfection and served on brown paper.
For her main course she received a bland dish of linguine with assorted seafood that had been requested spicy.
Speaking of spicy, the soup of the day on one occasion was a rousing Manhattan chowder brimming with assorted seafood.
A mince of lobster and scallop stuffed soft parcels of eggplant, and loads of assorted seafood mingled with slender threads of Singapore rice noodles.
Entrees include broiled chicken breast served with teriyaki glaze and seasonal vegetables; assorted fresh seafood simmered in the chef's special brown curry sauce, served with seasonal vegetables; and seafood tossed with linguine and your choice of marinara sauce or spicy cod roe butter.
Black squid-ink linguine dotted with assorted sweet seafood was fine, but pappardelle under a braised duck and porcini mushroom ragù was dry, not the lush treat we had anticipated.
The assorted fish and seafood were lightly cooked and bathed in a memorable Pernod-perfumed broth.
Basque seafood chowder — assorted fin fish in a tomato base — tasted like a good Manhattan clam chowder.
But with unlimited wine, as well as such specialties as Peking duck, Mandarin chicken and mushroom soup, assorted Szechwan appetizers, Indonesian seafood fritters, kung pao pork and Filipino custard for dessert, those dinners are invariably sold out, and therefore require reservations.
