At the beginning of the MMI was the idea of creating a local museum, and the collections that now inhabit our museum reflect its original purpose. Along with the most identifying museum collections, a vast collection of objects related to the line cod fishing and agro-maritime activities of the Aveiro lagoon, highlighting the various fishing techniques used in the lagoon, the museum holds a local and regional heritage that reflects the experiences of the Ílhavos. Without missing a valuable collection of ceramics, with special emphasis on glass and porcelain from Vista Alegre, a collection of painting, sculpture and drawing and a vast collection of seashells, as well as a collection of seaweed.
Temporally, these collections include the late nineteenth century to the twentieth century. Focusing mainly on the Portuguese coast, these collections reflect the maritime experience and influence of fishing on the populations of the coast.