Virginia Institute of Marine Science
Proceedings of the National Shellfisheries Association
Two experiments were carried out in 1971 using bay scallops spawned in Aug and Sept of 1970. 4 groups of 150 scallops were held at the surface, 1 m below the surface, 2 m off the bottom, and 1 m off the bottom, to find the effects of depth on growth and survival. Scallops were held in surface enclosures at 4 different densities (100, 75, 50 and 25/ft super(2)) to find out the effects of crowding. In the depth experiment growth was approx equal throughout the water column. Mortality decreased with increasing depth with the exception of those held at 1 m off the bottom. In the density experiment growth up to a height of 27.0-28.0 mm (1.1 in) was approx equal at all densities. Above this size, growth decreased with increasing density. Mortality was low and approx equal at all densities for the first 2 months but increased with increasing density during the last 2 months.
Duggan, William, Growth and survival of the bay scallop, Argopecten irradians, at various locations in the water column and at various densities (1973). Proceedings of the National Shellfisheries Association, 63, 68-71.