Standard ladder survey dredge for oysters. See papers for details

Lown AE, Hepburn LJ, Heywood JL, Cameron TC. European native oysters and associated species richness in the presence of non-native species in a southern North Sea estuary complex. Conservation Science and Practice. 2021; 3:e361. https://doi.org/10.1111/csp2.361

Lown AE, Hepburn LJ, Dyer R, Cameron TC. From individual vital rates to population dynamics: An integral projection model for European native oysters in a marine protected area. Aquatic Conserv: Mar Freshw Ecosyst. 2020; 30: 2191–2206. https://doi.org/10.1002/aqc.3445

Lown, Alice Elizabeth (2019) Community ecology and population dynamics of the European native oyster (Ostrea edulis) in Essex, UK: A baseline for the management of the Blackwater, Crouch, Roach and Colne Estuaries Marine Conservation Zone. Doctoral thesis, University of Essex.https://repository.essex.ac.uk/25930/