1987 - 1987 Centre for Environment, Fisheries & Aquaculture Science (Cefas) West Central North Sea Plankton Survey - RV Cirolana 08/87
Numbers of herring and sprat larvae caught by plankton survey. This survey was carried out as part of the International Council for the Exploration of the Sea (ICES) coordinated herring larvae survey of ICES Region IVb during the two standard sampling periods in October. Dataset includes associated positional data and sample volumes filtered.
dataset
http://data.cefas.co.uk/#/View/2552/
function: order
CEFAS7f8857ff-f5bc-49bd-af2a-44068e256233
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
biota
revision
2011-03-25
publication
2008-06-01
publication
2008-06-01
-2
2
55.75
53.25
revision
2010-05-18
1987-09-22
1987-10-12
publication
2020-01-27
notPlanned
Gear used for this cruise were the MAFF 53cm high speed sampler, LHPR, MBA pump, MOCNESS (Multiple Opening/Closing Net and Environmental Sensing System). Sampler deployment: The sampler was deployed in a double oblique tow from the surface to within 2 m of the seabed. Veering and hauling speeds were manually adjusted to ensure that each depth band was sampled equally. At shallow stations, multiple double oblique dives were necessary to enable a sufficient volume of water to be filtered. A minimum sampler deployment time of 15 minutes was aimed for. On recovery, the net was carefully washed down and the sample collected from the end bag. Each sample was then fixed using buffered formaldehyde solution and transported to the laboratory for sorting and identification. Sample analysis: Sorting and identification was carried out by experienced plankton taxonomists using established methods and guides. Fish larvae were picked out from all samples by eye and, whenever practicable, the whole sample was sorted. Fish larvae were readily identified unless they had been badly damaged during collection or were prematurely hatched. Data storage: The raw data were stored on an Access database. The various data files were stored on the database in a series of tables linked by having the content of certain fields in common. All routine calculations, calibration changes and conversions were carried out on the database. The data tables (but not queries etc) have now been extracted into text files. Plankton data are normally expressed as either number of organisms per m3 or per m2. The number per m3 is obtained by dividing the numbers per sample by the volume filtered, calculated from the sampler flowmeters. Number per m2 is obtained by multiplying the number per m3 by the mean sampled depth during a deployment.
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
originator
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
custodian
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
pointOfContact
2020-01-27T10:05:56