Citation:

essd-6-317-2014

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Abstract:

The development of the ecosystem approach and models for the management of ocean marine resources requires easy access to standard validated datasets of historical catch data for the main exploited species. They are used to measure the impact of biomass removal by fisheries and to evaluate the models skills, while the use of standard dataset facilitates models inter-comparison. North Atlantic albacore tuna is exploited all year round by longline and in summer and autumn by surface fisheries and fishery statistics compiled by the International Commission for the Conservation of Atlantic Tunas (ICCAT). Catch and effort with geographical coordinates at monthly spatial resolution of 1° or 5° squares were extracted for this species with a careful definition of fisheries and data screening. In total, thirteen fisheries were defined for the period 1956-2010, with fishing gears longline, troll, mid-water trawl and bait fishing. However, the spatialized catch effort data available in ICCAT database represent a fraction of the entire total catch. Length frequencies of catch were also extracted according to the definition of fisheries above for the period 1956-2010 with a quarterly temporal resolution and spatial resolutions varying from 1°x 1° to 10°x 20°. The resolution used to measure the fish also varies with size-bins of 1, 2 or 5 cm (Fork Length). The screening of data allowed detecting inconsistencies with a relatively large number of samples larger than 150 cm while all studies on the growth of albacore suggest that fish rarely grow up over 130 cm. Therefore, a threshold value of 130 cm has been arbitrarily fixed and all length frequency data above this value removed from the original data set.

Further details:

Report of the 2009 ICCAT Albacore Stock Assessment Session (Madrid, Spain, July 13 to 18, 2009) (2010). Collective Volume of Scientific Papers, 65(4), 1113-1253, hdl:10013/epic.42942.d001

Report of the 2013 ICCAT North and South Atlantic Albacore data preparatory meeting (Madrid, Spain - April 22 to 26, 2013) (2013). 66, hdl:10013/epic.42942.d002

Project(s):

Basin Scale Analysis, Synthesis and Integration (EURO-BASIN)

Funding:

Seventh Framework Programme (FP7), grant/award no. 264933 : Basin Scale Analysis, Synthesis and Integration

Coverage:

Median Latitude: 27.577956 * Median Longitude: -45.856431 * South-bound Latitude: 17.500000 * West-bound Longitude: -77.500000 * North-bound Latitude: 52.500000 * East-bound Longitude: 17.500000

Date/Time Start: 1987-01-15T00:00:00 * Date/Time End: 2011-12-15T00:00:00

Event(s):

ICCAT-L6 * Method/Device: Line Fishing Bait (LFB) * Comment: ICAAT-fisherycode: L6 = Taiwan-Subtropen; spatial resolution = 5 square degree

Comment:

This work was funded in part by the European project EURO-BASIN, funded by Framework Programme 7 (Contract 264933). Special thanks to ICCAT for the access to its public fishing database and Carlos Palma (ICCAT) and Alain Fonteneau (IRD) for their helpful advice on these data.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Code	Code		Lehodey, Patrick		of the region
3	DATE/TIME	Date/Time				Geocode
4	LATITUDE	Latitude				Geocode
5	LONGITUDE	Longitude				Geocode
6	Fishing effort	Fishing effort	#	Lehodey, Patrick	Determined by number of hooks	in number of hooks
7	Thunnus alalunga, mass	T. alalunga m	kg	Lehodey, Patrick

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

6927 data points

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