Scallop (Pecten novaezelandiae). Perhaps the most sought-after of all shellfish, scallops are fantastic eating. They are a classic bi-valve (two shells) with a flat valve and a concave valve. They have a strong adductor muscle (the white bit) that they use to open and close their shells. By closing their shells they jet out a stream of water that allows them to swim. The roe (the red bit) and the muscle are the parts most commonly eaten. Scallops become fertile at about one year old when they reach about 60mm across. (ref.www.wildblue.co.nz). Create a composition using one or a few different wall art pieces.