209a01947801e0fd6827989231181993 English dataset MEO Data lead Eastern Inshore Fisheries and Conservation Authority MEO Data Lead mail@eastern-ifca.gov.uk pointOfContact 2021-02-09 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4326 2009-2012 Eastern Inshore Fisheries and Conservation Authority (Eastern IFCA) River Stour and Orwell clam surveys 2015-04-07 publication 2015-04-07 creation 2015-04-07 revision EIFCASuffolkClams Between 2009 and 2012, Eastern IFCA (and its predeccesor, ESFJC) conducted stock assessment surveys of Manila clams (Vererupis philippinarum) along both the River Stour and River Orwell, Suffolk. The aim of the surveys was to monitor the presence of Manila Clams with the potential of identifying any potential commerical stocks that could be fished. MEO Data lead Eastern Inshore Fisheries and Conservation Authority MEO Data Lead mail@eastern-ifca.gov.uk originator MEO Data lead Eastern Inshore Fisheries and Conservation Authority MEO Data Lead mail@eastern-ifca.gov.uk custodian notPlanned Database 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 CC BY 4.0 otherRestrictions Data is freely available for research or commercial use providing that the originators are acknowledged in any publications produced. Charts are not to be used for navigation. English biota Charting Progress 2 Sea Areas 2009-06-18 creation Southern North Sea 1.1896 1.2196 51.9425 51.9548 1.1748 1.2583 51.9939 52.0163 2015-04-07 2015-04-07 MEO Data lead Eastern Inshore Fisheries and Conservation Authority MEO Data Lead mail@eastern-ifca.gov.uk distributor http://www.eastern-ifca.gov.uk/ A link to the general host site dataset Between 2009 and 2012, samples of Manila clams (Vererupis philippinarum) were collected at regular intervals in the summer, on a predetermined grid deployed from Kent and Essex IFCA vessel, RV Tamesis over high water. Forty-four stations were surveyed along the northern bank of the River Orwell between the Orwell Bridge and Levington Creek. Seventy-four stations were surveyed in the Holbrook bay area of the River Stour. Sample stations were spaced approx. 250 meters apart on the grid. Two to three samples were collected from each station using a 0.1m square day grab then the samples were washed over 3 millimetres (mm) washing table and any clams found were retained. Samples of clams were measured to the nearest mm by length and width and individually weighted to the nearest 0.01 gram. A qualitative description of the sediment type at each station was noted. Manila Clam (V. philippinarum) distribution and density maps were created in MapInfo GIS. The biomass of the Manila clams in each river was calculated by multiplying the mean weight of the samples by the area covered. Length measurements and size distributions were recorded for comparison of data between survey years.