The file liver_neoplasm.csv contains the data used in 'Trends and status of liver neoplasms in flatfish (2011-2020)', a Descriptor 8 Indicator in the UK's 2025 Marine Strategy Assessment. The data were collected under the UK's Clean Seas Environment Monitoring Programme (CSEMP) by the Centre for Environment, Fisheries and Aquaculture Science and the Marine Directorate of the Scottish Government.

The file is UTF-8-BOM encoded so can be read directly into Excel, or into R using the function read.csv with the argument fileEncoding = “UTF-8-BOM”.

The variables in the file are:

Lab ID
Description: laboratory identifier
Type: categorical
Levels: 2026
Note: each unique combination of Lab ID and Subsample number identifies an individual fish

Subsample number
Description: fish identifier (within each Lab ID)
Type: categorical
Levels: 1030
Note: each unique combination of Lab ID and Subsample number identifies an individual fish

Station name
Description: name associated with the monitoring station
Type: categorical
Levels: 44
Note:

CSEMP station name
Description: monitoring station identifier
Type: categorical
Levels: 44
Note:

Biogeographic region
Description: biogeographic region
Type: categorical
Levels: EASTERN CHANNEL, IRISH SEA, MINCHES AND WESTERN SCOTLAND, NORTHERN NORTH SEA, SCOTTISH CONTINENTAL SHELF, SOUTHERN NORTH SEA, WESTERN CHANNEL AND CELTIC SEA
Note: there are 8 biogeographic regions but only 7 with data

Year
Description: monitoring year
Type: discrete
Range: 2011, 2020
Note:

Assessment period
Description: assessment period
Type: categorical
Levels: 2011-2015, 2016-2020
Note:

Species
Description: species
Type: categorical
Levels: Limanda limanda
Note: AphiaID = 127139

Age
Description: fish age (y)
Type: discrete
Range: 1, 13
Note:

Length (cm)
Description: fish length (cm)
Type: continuous
Range: 9.6, 110
Note:

Sex
Description: sex
Type: categorical
Levels: F, I, M
Note:

Hepatocellular adenoma
Description: presence (1) or absence (0) of hepatocellular adenoma
Type: categorical
Levels: 0, 1
Note:

Cholangioma
Description: presence (1) or absence (0) of cholangioma
Type: categorical
Levels: 0, 1
Note:

Hemangioma
Description: presence (1) or absence (0) of hemangioma
Type: categorical
Levels: 0
Note:

Pancreatic acinar cell adenoma
Description: presence (1) or absence (0) of pancreatic acinar cell adenoma
Type: categorical
Levels: 0
Note:

Hepatocellular carcinoma
Description: presence (1) or absence (0) of hepatocellular carcinoma
Type: categorical
Levels: 0, 1
Note:

Cholangiocarcinoma
Description: presence (1) or absence (0) of cholangiocarcinoma
Type: categorical
Levels: 0
Note:

Pancreatic acinar cell carcinoma
Description: presence (1) or absence (0) of pancreatic acinar cell carcinoma
Type: categorical
Levels: 0
Note:

Mixed hepatobiliary carcinoma
Description: presence (1) or absence (0) of mixed hepatobiliary carcinoma
Type: categorical
Levels: 0
Note:

Hemangiosarcoma
Description: presence (1) or absence (0) of hemangiosarcoma
Type: categorical
Levels: 0
Note:

Hemangiopericytic sarcoma
Description: presence (1) or absence (0) of hemangiopericytic sarcoma
Type: categorical
Levels: 0
Note:

Cancer
Description: presence (1) of any of the above cancers or absence (0) of all of them
Type:categorical
Levels: 0, 1
Note: