ec3b99fe23000168dc3487608f5ffe25 English 26dee2f510202899e51ae2e5c876a51c dataset Cornwall Inshore Fisheries and Conservation Authority Data Officer Cornwall IFCA Research Team enquiries@cornwall-ifca.gov.uk pointOfContact 2024-07-22 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4326 2014 Cornwall Inshore Fisheries and Conservation Authority (IFCA) Fal Oyster Survey 2014-05-20 publication CIFCA_FAL_OYS_2014 Cornwall Inshore Fisheries and Conservation Authority (IFCA) conduct annual dredge surveys within the Fal Oyster Fishery since taking over management of the fishery in 2014. The purpose of the survey was initially to assess the distribution and abundance of native oysters (Ostrea edulis) within the Fal Fishery management area in the River Fal, Cornwall. The aim of the survey were to investigate the relative abundance and distribution of native oysters (O. edulis) within the Fal Oyster Fishery. In 2014, a total of 77 sites were completed and a total of 1,771 oysters. Research Team Cornwall IFCA Cornwall Inshore Fisheries and Conservation Authority enquiries@cornwall-ifca.gov.uk originator Research Team Cornwall IFCA Cornwall Inshore Fisheries and Conservation Authority enquiries@cornwall-ifca.gov.uk custodian asNeeded Marine Environmental Data and Information Network NDGO0005 Species distribution GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Shellfish abundance and biomass in water bodies SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Data is freely available for research or commercial use providing that the originators are acknowledged in any publications produced and permission must be sought if the data will be reproduced in full or part or if used in any analyses. otherRestrictions No restrictions to public access English biota Charting Progress 2 Sea Areas 2009-06-18 creation Western Channel and Celtic Sea International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation English Channel SeaDataNet vertical extent keywords 2010-01-01 revision water column -5.0653 -5.0063 50.1554 50.2482 2014-03-19 2014-05-20 Research Team Cornwall IFCA Cornwall Inshore Fisheries and Conservation Authority enquiries@cornwall-ifca.gov.uk distributor dataset MEDIN data guideline for species and benthos data by trawl or dredge 2023-05-11 publication See the referenced specification true The positions of the survey sites were based on previous survey positions from surveys carried out by Cefas/ Cornwall Council prior to Cornwall IFCA taking over management of the fishery in 2014. The survey was carried out onboard research vessel Kerwyn. The oyster dredge used was an Essex-style oyster dredge with a 72 cm blade, rigged with 34 mm diameter steel belly rings and a 45 mm (twin 3 mm nylon twine) mesh back. The dredge was deployed and recovered via the stern of the Research vessel. A tow haul method was adopted, similar to that used by the oyster punts. This allowed the dredge tow to be of a known distance and to be easily and consistently replicated. At each survey site the survey vessel was anchored and 60 m of anchor line was let out. The dredge was shot and recovered by hand. Once recovered, the dredge contents were emptied on to the sorting table. If the dredge did not fish, due to being blinded or flipped over, or the sample appeared smaller than it should be for particular areas, the dredge haul was repeated. Each sample was photographed on the sorting table alongside a clapper board prior to sorting. Live native oysters were removed and set aside as the sample was sorted. All live oysters were counted and measured across the widest point, to the nearest mm using Vernier callipers. The values for all measurements recorded were written on recording sheets.