Cardumen

In Madrid, Cardumen is best understood as a seafood-focused Spanish grill restaurant with a clear point of view: go when the group wants fish and shellfish at the center of the meal. The details are direct rather than elaborate: the restaurant is in Madrid, the expected spend is about $75 per person, the dress code is smart casual, the schedule runs from afternoon service into the evening on most open days, with later hours from Thursday through Saturday.

The first decision is whether that focus suits the occasion. This is not a page with details about a tasting-menu format, chef narrative, seat count, wine program, or specific service style, so the safest reason to choose Cardumen is simpler: seafood-led Spanish grilling in Madrid. It works well for diners who want the meal to revolve around the restaurant’s known seafood-grill identity and signature dishes.

The seafood-grill focus is the reason to go

Cardumen’s strongest identity is its seafood-focused Spanish grill format. That makes it a natural fit for diners who want a meal built around fish, shellfish, direct preparations. At about $75 per person, it is better approached as a considered booking than as a casual drop-in.

Signature dishes named for the venue include rodaballo a la brasa, tuétano asado, Pastela Cardumen, mejillones en salsa Thai, tartare de atún rojo, almeja fina, Japanese-style scallops. A practical ordering strategy is to use those dishes as anchors: choose from the named seafood and shellfish dishes, make grilled fish part of the meal if that is the reason for the booking. Tuétano asado offers a richer counterpoint for tables that want something beyond seafood.

The restaurant’s smart-casual dress code also helps define the mood. Cardumen does not need to be framed as a formal trophy reservation; it is better described as a seafood-grill choice for Madrid diners who care most about the cuisine focus and named dishes. For guests comparing options, the important questions are whether seafood is the priority, whether the price point fits the night, whether the available hours match the plan.

Choose it for a seafood-focused Madrid meal

Cardumen is in Madrid, the location detail should be kept at the city level. That makes it a restaurant to plan intentionally rather than one to define by an invented neighborhood hook or a specific street address. It is a good fit when the purpose of the booking is a Spanish grill meal centered on fish and shellfish.

The hours matter for planning. Cardumen is closed on Monday. It opens Tuesday and Wednesday from 13:30 to 18:30, Thursday through Saturday from 13:30 to 01:30, Sunday from 13:30 to 18:30. For broader planning, use our full Madrid restaurants guide, our full Madrid bars guide, our full Madrid hotels guide to decide whether Cardumen should be the main meal of the day or part of a wider Madrid itinerary. Wine travelers can also cross-check our full Madrid wineries guide, while itinerary builders can use our full Madrid experiences guide.

Recognition is modest but useful: the Macarfi 7.4 Food Rating in 2026 gives Cardumen a local quality signal without turning the meal into an awards-chasing exercise. That fits the appeal. The strongest reason to book is not prestige; it is the combination of Madrid, a seafood-focused Spanish grill identity, a smart-casual dress code, a menu with named dishes such as rodaballo a la brasa, tartare de atún rojo, almeja fina, Japanese-style scallops.