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RB, Ribadeo; BA, Barallobre; PO, Ría de Pontevedra; CA, Cangas; AV, Aveiro; OB, Óbidos; AL, Algarve (Gulf of Cádiz); VE, Venice Lagoon. Right legend represents P. olseni infection intensity scored using 0–5 Mackin’s infection intensity scale (Ray, 1954).
