Clam, called Huajia in Guangdong, is actually a tone sandhi that translates Clam into Mandarin and then back into Mandarin. Shenzhen is dominated by spicy stir-frying. You can add lobster sauce if you like it, and say in advance if you don't like it.
Razor clam: Actually, it's a razor clam. Cantonese people can't tell the difference. Boil or stir-fry shredded ginger. I suggest you eat boiled water. Seafood. Seafood is delicious. I think Cantonese people are spoiling seafood.
Crab: steamed crab, fried crab in typhoon shelter and fried crab with ginger and onion.
Shrimp: Big bamboo shrimp (called Jiujie shrimp in Guangdong). You can have shrimp with garlic. Steamed with garlic after back surgery. Braised prawns with shredded ginger. You will eat it with sauce. You often eat this. I don't need to say it.
Flower snail: boiled in clear water
Fish: mainly steamed
Elephant mussel: Eat two. Its meat is sliced with a knife and dipped in mustard sauce, which is very delicious. The yellow side is casserole porridge.
I hope it helps you.
PS； I used to eat there. Now that I'm married, I do it myself at home. Cheap and delicious, because I grew up by the sea. Ha ha.