The data file contains the following columns:
Haul ID - Composed unique identifier with naming structure: survey series/vessel/year/haul number
Survey Acronym: Acronym to describe this survey dataset - used both in sampling info and biological data
Ship: Four letter code corresponding to the ICES Ship code from vocabulary TS_Ship on http://vocab.ices.dk
Gear Type: Broad term classifying/filtering Gear types.
Gear: Explicit gear used for fishing. Alphanumeric code corresponding to entries in ICES Gear Voabulary on http://vocab.ices.dk
YearShot: The year in which gear was deployed
MonthShot: The month in which the gear was deployed
DayShot: Day on which the gear was shot (day of the month)
Hauldur_min: The duration of fishing in minutes
ShootLat_degdec: Latitude of the shooting position of gear expressed as decimal degrees (WGS84)
ShootLong_degdec: Longitude of the shooting position of gear expressed as decimal degrees (WGS84). Western longitude is negative.
ICESStSq: ICES Statistical rectangle in which the haul took place
SurveyStratum: Depending on the specific survey, the stratum is either the ICES statistical rectangle, or reference to an entry in the ICES vocabulary TS_Depthstratum on http://vocab.ices.dk
Depth_m: Depth at shot position (in meters)
Distance_km: Towed distance (km)
WingSpread_m: Mean distance between the wings during fishing operation (m)
DoorSpread_m: Mean distance between the doors during fishing operation (m)
NetOpen_m: Mean head-line height above seabed during fishing operation (m)
WingSwpArea_sqkm: Area of seabed swept by the net (square kilometers) - please consult Greenstreet and Moriarty 2017 for details
WingSwpVol_CorF: Multiplier converts to ‘density by wing-swept volume - please consult Greenstreet and Moriarty 2017 for details
DoorSwptArea_CorF: Multiplier converts to ‘density by door-swept area - please consult Greenstreet and Moriarty 2017 for details
DoorSwptVol_CorF: Multiplier converts to ‘density by door-swept volume - please consult Greenstreet and Moriarty 2017 for details
3. Biological Data - Standard Survey Area - Greater North Sea International Otter Trawl Quarter 3
The data file contains the following columns:
Haul ID: Composed unique identifier with naming structure: survey series/vessel/year/haul number. Allows merging with sample data file
Survey Acronym: Acronym to describe this survey dataset - used both in sampling info and biological data
Species SciName: Scientific species name
Aphia_Code: The APhiaID for the species. Prefix url for lookup is www.marinespecies.org/aphia.php?p=taxdetails&id=[Insert APhia_Code here]
Fish length_cm: Length of fish expressed in centimetres
Number: Number of fish reported in the trawl
DensAbund_N_Sqkm: Density of the fish species and size expressed as numbers per square kilometres when corrected for the swept area in each tow
DenBiom_kg_Sqkm: Density of the fish species and size expressed as kilograms biomass per square kilometre, when the abundance is corrected for swept area in each tow and converted to biomass using a length:weight relationship.