Fig. 4From: A case study of local ecological knowledge of shellfishers about edible cockle (Cerastoderma edule) in the Ria de Aveiro lagoon, Western IberiaCockle spawning period according to shellfishers (A) and Cockle harvesting effort by production zones in the last years at Ria de Aveiro, Portugal (B). In (B) A Decreased and B IncreasedBack to article page