1999 Coral Cay Conservation Sub-Aqua Club (CCC-SAC) Fal Estuary Maerl and Seagrass Dive Survey dataset https://portal.medin.org.uk/portal/start.php?tpc=010_7e221927e8cfb7e646c94ac32ab47e7d A small team of divers undertook a survey of the Fal estuary during the priod 27th-31st August 1999 to assess the amount of Zostera marina and also the amount of Maerl on the St. Mawes bank, and St. Mawes harbour. The team found and mapped three main Zostera beds and identified small patches of Zostera at two further locations. No detailed attempt was made to survey these beds for the presence of parasitic slime mould nor the amount of epiphyte cover. The team also carried out fourteen separate transect dives to record the percentage amount of both total maerl and also live maerl. The main maerl species present was lithothamnion calcareum. This was supplemented with a more detailed survey round a fixed datum point situated off Castle Point at the entrance to St. Mawes harbour. Large deposits of maerl were found on St. Mawes bank and also round the central datum marker often with a high percentage of this live especially in shallow water. The maerl was often found in association with the brown algae Cutleria multifida. 20001231