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| Dataset Title: | Irish Ground Fish Survey for commercial fish species
|
| Institution: | MI, ICES (Dataset ID: ices_DATRAS_IE_IGFS) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
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|
Attributes {
s {
ScientificName {
String long_name "ScientificName";
String units "https://vocab.nerc.ac.uk/collection/P01/current/SCNAME01/";
String units_uri "https://vocab.nerc.ac.uk/collection/P01/current/SCNAME01/";
}
BasisOfRecord {
String long_name "BasisOfRecord";
String units "None";
String units_uri "None";
}
InstitutionCode {
String long_name "InstitutionCode";
String units "None";
String units_uri "None";
}
YearCollected {
Float32 actual_range 2003.0, 2008.0;
String long_name "YearCollected";
String units "None";
String units_uri "None";
}
MonthCollected {
Float32 actual_range 9.0, 12.0;
String long_name "MonthCollected";
String units "None";
String units_uri "None";
}
DayCollected {
Float32 actual_range 1.0, 31.0;
String long_name "DayCollected";
String units "None";
String units_uri "None";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.06681416e+9, 1.22787198e+9;
String axis "T";
String ioos_category "Time";
String long_name "Time";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
String units_uri "None";
}
TimeOfDay {
Float32 actual_range 6.133, 20.02;
String long_name "TimeOfDay";
String units "None";
String units_uri "None";
}
MaximumDepth {
Float32 actual_range -9.0, 750.0;
String long_name "MaximumDepth";
String units "None";
String units_uri "None";
}
sex {
String long_name "sex";
String units "None";
String units_uri "None";
}
ObservedIndividualCount {
Float32 actual_range -9.0, 61540.0;
String long_name "ObservedIndividualCount";
String units "http://rs.tdwg.org/dwc/terms/individualCount";
String units_uri "http://rs.tdwg.org/dwc/terms/individualCount";
}
Notes {
String long_name "Notes";
String units "None";
String units_uri "None";
}
longitude {
String _CoordinateAxisType "Lon";
Float32 actual_range -14.555, -3.459;
String axis "X";
String ioos_category "Location";
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String units_uri "http://rs.tdwg.org/dwc/terms/decimalLongitude";
}
latitude {
String _CoordinateAxisType "Lat";
Float32 actual_range 50.12, 56.5;
String axis "Y";
String ioos_category "Location";
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String units_uri "http://rs.tdwg.org/dwc/terms/decimalLatitude";
}
aphia_id {
Float32 actual_range 11704.0, 11760.0;
String long_name "aphia_id";
String units "https://vocab.nerc.ac.uk/collection/P01/current/SNANID01/";
String units_uri "https://vocab.nerc.ac.uk/collection/P01/current/SNANID01/";
}
}
NC_GLOBAL {
String AccConstrDescription "This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials.";
String AccConstrDisplay "This dataset is licensed under a Creative Commons Attribution 4.0 International License.";
String AccConstrEN "Attribution (CC BY)";
String AccessConstraint "Attribution (CC BY)";
String AccessConstraints "ICES Data Policy: https://www.ices.dk/data/guidelines-and-policy/Pages/ICES-data-policy.aspx";
String Acronym "IE-IGFS";
String BrackishFlag "0";
String CDate "2010-12-22";
String cdm_data_type "Other";
String CheckedFlag "0";
String Citation "Fish trawl survey: Irish Ground Fish Survey for commercial fish species. ICES Database of trawl surveys (DATRAS). The International Council for the Exploration of the Sea, Copenhagen. 2010. Online source: http://ecosystemdata.ices.dk..";
String Comments "None";
String ContactEmail "None";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_name "Holdsworth";
String CurrencyDate "None";
String DasID "2762";
String DasOrigin "Monitoring: field survey";
String DasType "Data";
String DasTypeID "1";
String DescrCompFlag "0";
String DescrTransFlag "0";
Float64 Easternmost_Easting -3.459;
String EmbargoDate "None";
String EngAbstract "The dataset includes age- and length-based catch per unit effort data for commercial fish species collected during the Irish Ground Fish trawl survey.";
String EngDescr
"Fisheries Science Services (FSS) carries out the annual Irish Groundfish Survey (IGFS) in the fourth quarter of each year as part of a larger coordinated survey effort with our EU neighbours (France to the south; and the UK to the north).
A broad spectrum of data is collected during the survey, but the overriding objective is to provide information on commercially exploited fish stocks. In particular the survey provides an index of the proportion of juveniles in the stock, which in turn gives an indication of its spawning success. This is an important source of information not available from commercial landings due to the necessary minimum fish length restrictions on commercial catches.
In addition, the survey provides data on species and environmental parameters in areas of both high and low commercial activity. This gives a better context to data for the entire survey area as opposed to focusing entirely on traditional fishing hot-spots that can remain stable while significant changes in surrounding background abundance and distribution go un-noticed.
The primary goal of the groundfish survey is to develop estimates of juvenile abundance for important species. Measurements of the abundance of juvenile fish are a critical measure of the health of a stock, serving as an annual indication of recruitment (the number of newly spawned fish which enter the population each year) success or failure. Most importantly, they allow forecasting of future commercial abundance.
Survey provides data on the distribution and biology of commercial and non-commercial species of ecological interest, as well as hydrographic and environmental observations. When these data are combined with annual recruitment indices they can help identify the possible causes driving year-class success or failure, and allow us to see long-term changes in populations that may have been caused by fishing, pollution, or climate change. This spatial dataset comprises the haul station location from the trawl survey. The Irish Groundfish Survey feeds into the International Bottom Trawl Survey [ie. IBTS] for international reporting.
The Irish West Coast Groundfish Survey started in 1990 and for the first two years consisted of circa 25 stations concentrated around the Irish coast in ICES Areas Via South and VIIb. Adverse weather in 1992 limited station coverage to only 4 stations which effectively broke the time series.
The survey was re-established in 1993 and has consisted of circa 70 stations, for Parts A and B combined, since then. Spatial coverage was extended west out to the 200m contour, but remains as Via South and VIIb.
Due to the restrictions of the current and previous research vessel commercial trawlers have been contracted to carry out the survey work. Wherever possible continuity of vessel and gear has been maintained and standard IBTS methodology applied. However, due to reduced staffing on commercial vessels it has rarely been possible to completely sort the catch.
Until 2000 all cod were sorted from the catch and then a sub-sample of two baskets was taken and completely sorted. From 2001 onwards, in response to an overall review of survey sampling undertaken during the IPROSTS Project (Anon 2001), the catch is completely sorted for all target species and a qualitative assessment made of the residual catch as a minimum.
The Irish surveys use an ICES rectangle based sampling strategy. The sampling design attempts to allocate at least two stations per rectangle (where the sea area is appropriate). Stations are selected randomly within each rectangle from known clear tow positions.
On the WCGS and ISCGS circa 70 fishing stations are planned on each survey every year. The number of hauls is adjusted according to the ship time available at sea.
The Irish West Coast Groundfish Survey is carried out in two parts: Part A covers ICES Division Via (south) and VIIb (north); Part B covers ICES Division VIIb and VIIj. The survey is conducted from 15 to 300 m depths during the fourth quarter (October - November). The Irish West Coast Groundfish Survey is carried out on chartered commercial fishing vessels. Whilst the same vessel (MFV Marliona, 224 gross tonnage and 30 m LOA) has normally been used each year for Part A and Sionann for Part B, in 2001 Part B was conducted from the MFV Regina Ponti (34.5 m LOA). Both vessels use a Rockhopper net with 12 inch discs and 11 inch Thyboron doors. The nets are fitted with a 20 mm codend liner. Gear performance throughout the survey is monitored using Furuno Ch24 (Headline Monitor).
The Irish Sea Celtic Ground Survey commenced in 1997 and evolved from an earlier Irish Sea Juvenile Fish Survey. As a consequence early survey stations concentrated largely, though not exclusively, around a number of shallow spawning areas along the Irish east coast in VIIa. These positions were expanded in combination with clear tows provided by the industry and CEFAS as well as some exploratory tows.
Spatial coverage therefore extended into the western Irish Sea from 2001 into the area around the Isle of Man, Liverpool and Cardigan Bays and the Welsh coast. The survey is carried out on the Irish research vessel the R.V. Celtic Voyager.
The sampling procedure on board conforms to the IBTS standard protocols and as such all cod are sampled and aged, the entire catch is sorted and then sub-sampled as and where appropriate.
The Irish survey in the Irish Sea and Celtic Sea covers ICES Division VIIa and VIIg. The survey is conducted from 10 to 150 m depths during the fourth quarter (November-December) by the RV Celtic Voyager. This vessel is 32 m in length with gross tonnage of 340 t. The fishing gear used is a GOV 28.9/37.1 Trawl with Morgere Kite (0.85 by 0.85m). Mean vertical opening is 6 m and door spread 48 m. Morgere Polyvalent doors (Type AA4.5) are used and gear performance is monitored throughout the survey using the SCANMAR (RX400) net monitoring system (Headline height, Door spread).
Trials on the new 65m research vessel, the R.V. Celtic Explorer, are due to commence in late 2002. Therefore, from 2003 onwards all Irish Surveys will be conducted on this new vessel, starting around mid October through to late November.";
String FreshFlag "0";
Float64 geospatial_lat_max 56.5;
Float64 geospatial_lat_min 50.12;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -3.459;
Float64 geospatial_lon_min -14.555;
String geospatial_lon_units "degrees_east";
String history
"2025-03-09T23:39:25Z (local files)
2025-03-09T23:39:25Z http://erddap.eurobis.org/erddap/tabledap/ices_DATRAS_IE_IGFS.html";
String infoUrl "None";
String InputNotes "None";
String institution "MI, ICES";
String keywords "aphia_id, BasisOfRecord, DayCollected, InstitutionCode, latitude, longitude, MaximumDepth, MonthCollected, Notes, ObservedIndividualCount, ScientificName, sex, time, TimeOfDay, YearCollected";
String License "https://creativecommons.org/licenses/by/4.0/";
String license
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
String Lineage "None";
String MarineFlag "1";
Float64 Northernmost_Northing 56.5;
String OrigAbstract "None";
String OrigDescr "None";
String OrigDescrLang "English";
String OrigDescrLangNL "Engels";
String OrigLangCode "en";
String OrigTitle "None";
String OrigTitleLang "None";
String OrigTitleLangCode "None";
String OrigTitleLangNL "None";
String Progress "Completed";
String PublicFlag "1";
String ReleaseDate "None";
String ReleaseDate0 "None";
String RevisionDate "None";
String SizeReference "More than 170,153 records";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 50.12;
String standard_name_vocabulary "CF Standard Name Table v70";
String StandardTitle "Irish Ground Fish Survey for commercial fish species";
String subsetVariables "ScientificName,BasisOfRecord,YearCollected,MonthCollected,DayCollected,sex,aphia_id";
String summary "The dataset includes age- and length-based catch per unit effort data for commercial fish species collected during the Irish Ground Fish trawl survey.";
String TerrestrialFlag "0";
String time_coverage_end "2008-11-28T11:33:00Z";
String time_coverage_start "2003-10-22T09:16:00Z";
String title "Irish Ground Fish Survey for commercial fish species";
String UDate "2022-08-09";
String VersionDate "None";
String VersionDay "None";
String VersionMonth "None";
String VersionName "None";
String VersionYear "None";
String VlizCoreFlag "1";
Float64 Westernmost_Easting -14.555;
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.