2009-2012 Eastern Inshore Fisheries and Conservation Authority (Eastern IFCA) River Stour and Orwell clam surveys
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.
dataset
http://www.eastern-ifca.gov.uk/
description: A link to the general host site
EIFCASuffolkClams
eng
urn:ogc:def:crs:EPSG::4326
biota
revision
2008-01-06
revision
2009-11-16
1.1896
1.2196
51.9548
51.9425
creation
2009-06-18
Southern North Sea
2015-04-07
2015-04-07
publication
2015-04-07
creation
2015-04-07
revision
2015-04-07
notPlanned
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.
CC BY 4.0
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.
MEO Data Lead
Eastern Inshore Fisheries and Conservation Authority
originator
MEO Data Lead
Eastern Inshore Fisheries and Conservation Authority
custodian
MEO Data Lead
Eastern Inshore Fisheries and Conservation Authority
pointOfContact
2021-02-09