@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://ckan.integration.publishing.service.gov.uk/dataset/cdd80f22-8e93-445b-8821-2135b0379f57> a dcat:Dataset ;
    dct:description """Reconstructed annual mean North Sea fishing mortality 1850-2020 for 21 North 
Sea stocks. Further details can be found in the README file.

Sandeel, Norway pout, sandeel, herring, sole, whiting, plaice, haddock, cod, 
saithe are data-rich stocks with full ICES assessments. Horse mackerel and 
mackerel have assessments with lower levels of information behind them; poor 
cod, dab, long rough dab, lemon sole, witch, grey gurnard, starry ray, cuckoo 
ray, monkfish are data-poor.

Fishing mortality is in reciprocal years (yr-1), being the negative log of the 
fraction of the stock left after one year of fishing at this intensity. So if 
1/4 of the stock was fished out in a year, the mortality would be -log(1 - 
1/4) or ~0.29.

The relation between the annual harvest rate (H - 25% in the above case) and 
fishing mortality (F) in reciprocal years is given by:

F = - log ( 1 - H )""" ;
    dct:identifier "CEFAS03a925f9-0009-4e39-bb8f-1f06e617003d" ;
    dct:issued "2025-05-05T11:09:43.415809"^^xsd:dateTime ;
    dct:modified "2026-06-18T09:09:10.472592"^^xsd:dateTime ;
    dct:publisher <https://ckan.integration.publishing.service.gov.uk/organization/c756c8da-f176-4640-950e-9c00b9e404df> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((8.0000 51.0000, -3.5000 51.0000, -3.5000 61.5000, 8.0000 61.5000, 8.0000 51.0000))"^^gsp:wktLiteral,
                "{\"type\": \"Polygon\", \"coordinates\": [[[8.00, 51.00], [-3.50, 51.00], [-3.50, 61.50], [8.00, 61.50], [8.00, 51.00]]]}"^^<https://www.iana.org/assignments/media-types/application/vnd.geo+json> ] ;
    dct:title "Reconstructed annual mean fishing mortality data for 21 important North Sea stocks since 1850" ;
    dcat:distribution <https://ckan.integration.publishing.service.gov.uk/dataset/cdd80f22-8e93-445b-8821-2135b0379f57/resource/0d1a4098-7021-4414-bb6a-997654f2f0f8> .

<https://ckan.integration.publishing.service.gov.uk/dataset/cdd80f22-8e93-445b-8821-2135b0379f57/resource/0d1a4098-7021-4414-bb6a-997654f2f0f8> a dcat:Distribution ;
    dct:description "The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: Binary download, CSV." ;
    dct:issued "2026-06-18T09:09:10.497460"^^xsd:dateTime ;
    dct:modified "2026-06-18T09:09:10.477539"^^xsd:dateTime ;
    dct:title "Cefas Data Portal" ;
    dcat:accessURL <https://data.cefas.co.uk/view/22118> .

<https://ckan.integration.publishing.service.gov.uk/organization/c756c8da-f176-4640-950e-9c00b9e404df> a foaf:Organization ;
    foaf:name "Marine Environmental Data & Information Network" .