Este é o marisco mais caro do mercado.

Questions & Answers about Este é o marisco mais caro do mercado.

Why is it do mercado instead of no mercado for 'in the market'?
When you form a superlative in Portuguese, like 'the most expensive' (o mais caro), you use the preposition de to indicate the group or place, not em. Here, de contracts with the article o to become do. So, 'the most expensive in the market' literally translates to 'the most expensive of the market'.
Why use Este instead of Isto to say 'this'?
Este is used because it refers to a specific, known masculine noun in the sentence: marisco (seafood). You use the invariable pronoun isto only when referring to an abstract idea, a general situation, or an unidentified object.
Could I change the word order and say o mais caro marisco?
It is much more natural to say o marisco mais caro. In Portuguese, adjectives generally come after the noun they describe. When forming a superlative, you keep that normal order: definite article + noun + mais + adjective.
Is marisco only a single piece of shellfish, or all seafood?
Although marisco is a singular word, it acts as a collective noun to mean 'seafood' or 'shellfish' as a general category, just like in English. You will rarely see it in the plural (mariscos) unless someone is referring to distinct varieties or species.

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