If you have trust (itmi'naan) in the reliability of the label, and its authority, or if it comes from an Islamic country, then you can consider it to be halal, and there is no need to go into detail to check further.
Haraam sea food is not allowed to be eaten but it is not Najis, that is why, Halal food cooked in utensils that were used for Haraam seafood is allowed.
This is only for the non Halal seafood because it is not Najis, otherwise, every non Halal food like meat, chicken etc is Najis and utensils used in cooking it become Najis and must be made Taahir before we can use it in cooking.
It is good to mention that non Halal seafood includes every seafood except scaled fishes and prawns.
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