Marine_Scotland_FishDAC_12394 eng dataset Scottish Government (Marine Scotland) +44 (0)300 244 4000 marinescotland@gov.scot pointOfContact 2025-06-10 MEDIN Discovery Metadata Version 2.3.7 urn:ogc:def:crs:EPSG::4326 OGP Sea lice counts on wild sea trout 2022-02-04 publication Marine_Scotland_FishDAC_12394 Data comprise sampling for wild sea trout from named sampling locations. The number of fish, individual fish fork length and the number and life cycle stage of any sea lice found are all recorded. Notes on temporal and spatial coverage Data are in a single sheet however there are minor differences in spatial coverage, data covering 1997 – 2009 and 2011 – 2024 include available data covering all mainland west coast and western isles fisheries trusts regions. Data from 2010 features only data from mainland west coast fisheries trust regions (which includes some inner islands). There was no data collection in 2020. Column headings “site” contains the sampling site name “region” contains information on the general region of Scotland within which the sample site is located. “date” contains the date that sampling point was undertaken “fish_id” contains a number to identify individual fish “length” contains the fork length in mm of the individual sea trout “copepodid_chalimus” contains the number of this life cycle stage of lice found on the individual fish “preadult_adult” contains the number of this life cycle stage of lice found on the individual fish “ovigerous_females” contains the number of this life cycle stage of lice found on the individual fish Acknowledgements This work was funded by Scottish government Marine Directorate, and managed by Marine Directorate and Fisheries Management Scotland. Sampling was carried out by employees of the district fisheries trusts with the help of volunteers as required. Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot pointOfContact Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot custodian Scottish Government (Marine Scotland) +44 (0)300 244 4000 Mailpoint 11, Area 1B South, Victoria Quay Edinburgh EH6 6QQ United Kingdom marinescotland@gov.scot distributor Fisheries Management Scotland +44 (0)131 221 6567 11 Rutland Square Edinburgh EH1 2AS United Kingdom general@fms.scot originator Not Planned Marine Environmental Data and Information Network Fish disease and parasites SeaDataNet Parameter Discovery Vocabulary 2018-12-12 revision The following attribution statement must be used: Contains information from the Scottish Government (Marine Scotland) licensed under the Open Government Licence v3.0. otherRestrictions no limitations to public access 200.00 eng biota environment inlandWaters oceans -8.144531 -4.255371 55.29997 58.91221 SeaDataNet vertical extent keywords 2010-01-01 revision The entire body of water between the bed and the atmosphere. 1997-04-07 2019-07-31 Middlemas, S. J., Fryer, R. J., Tulett, D. and Armstrong, J. D. (2013) ‘Relationship between sea lice levels on sea trout and fish farm activity in western Scotland’, Fisheries Management and Ecology, 20(1), pp. 68–74. doi: 10.1111/fme.12010, Middlemas, S. J., Raffell, J. A., Hay, D. W., Hatton-Ellis, M. and Armstrong, J. D. (2010) ‘Temporal and spatial patterns of sea lice levels on sea trout in western Scotland in relation to fish farm production cycles’, Biology Letters, 6(4), pp. 548–551. doi: 10.1098/rsbl.2009.0872, Shephard, S., MacIntyre, C. and Gargan, P. (2016) ‘Aquaculture and environmental drivers of salmon lice infestation and body condition in sea trout’, Aquaculture Environment Interactions, 8, pp. 597–610. doi: 10.3354/AEI00201 https://dx.doi.org/10.7489/12394-1 DOI:https://dx.doi.org/10.7489/12394-1 https://dx.doi.org/10.7489/12394-2 DOI:https://dx.doi.org/10.7489/12394-2 https://doi.org/10.7489/12394-1 download https://doi.org/10.7489/12394-1 download dataset Sampling was undertaken between April and September, annually between 1997 and 2014. Each sampling event aims to catch at least 30 fish of either post-smolt and/or finnock life stage. Once caught, fish are anaesthetised using neutral-buffered MS222 (100 mgl-1) with the water poured through a 100µm sieve to catch any lice detached during the anaesthetising process. Fork length (to the nearest mm) was recorded during this process. For counting of lice, fish are placed in water against a light background with the number of lice present on the fish and the life cycle stages of the lice recorded as one of the following three categories: Category 1: Early stages: attached copepodids and chalimus. Category 2: Mobile stages: pre-adults and adults including mature males and non-ovigerous females. Category 3: Gravid stages: ovigerous females. Further details on sweep netting method can be found at https://www.sfcc.co.uk/assets/files/SFCC%20Sweep%20Netting%20Protocol.pdf Column headings “site” contains the sampling site name "region" contains the wider region within which sampling sites are situated “date” contains the date that sampling point was undertaken “fish_id” contains a number to identify individual fish “length” contains the fork length in mm of the individual sea trout “lice_stage” contains the sea lice life cycle stage. Either "copepodid_chalimus", "preadult_adult" or "ovigerous_females" In the column based resource, the following columns are included: “copepodid_chalimus” contains the number of this life cycle stage of lice found on the individual fish “preadult_adult” contains the number of this life cycle stage of lice found on the individual fish “ovigerous_females” contains the number of this life cycle stage of lice found on the individual fish In the row based resource, the following columns are included: "lice stage" describing the development stages detailed above “count” contains the number of sea lice of the specified class on the fish Acknowledgements This work was funded by Marine Scotland, and managed by Marine Scotland Science and Fisheries Management Scotland. Sampling was carried out by employees of the district fisheries trusts with the help of volunteers as required.