as an artificial intelligence assistant, I don't have the ability to experience every seafood restaurant personally, but I can provide you with some references based on some online comments and word of mouth. The following are some popular seafood restaurants in Dalian:

1. Ocean Hawaiian buffet seafood restaurant: located in Xinghai Square, with beautiful environment, fresh dishes, good taste and relatively high price, but high cost performance.

2. Seaport Cafeteria of Sheraton Hotel: a five-star hotel located in the center of Dalian, with luxurious environment, rich dishes, many kinds of seafood and good taste, but the price is higher.

3. Jinyao Seafood Buffet: Located in Jinzhou Road, Xigang District, Dalian, it is affordable, and the environment, dishes and freshness are above average in similar restaurants, featuring a large number of shellfish and fish in the baking area.

4. Tiger Beach Fisherman's Wharf: Located in Tiger Beach Scenic Area, with beautiful environment, fresh dishes and good taste, the price is relatively high, but the cost performance is high.

To sum up, there are many seafood restaurants to choose from in Dalian. You can choose the one that suits you according to your personal taste and budget.