https://www.dassh.ac.uk/ipt/resource?r=st_baskingsharkproject ST_BSP Harriet Allen Shark Trust Data Analyst

4 Creykes Court, 5 Craigie Drive Plymouth Devon pl13jb GB

conservation@sharktrust.org Harriet@sharktrust.org 0000-0001-5108-2032 Cat Gordon Shark Trust Senior Conservation Officer

4 Creykes Court, 5 Craigie Drive Plymouth Devon pl13jb GB

cat@sharktrust.org Harriet Allen Shark Trust Data Analyst

4 Creykes Court, 5 Craigie Drive Plymouth Devon pl13jb GB

conservation@sharktrust.org Harriet@sharktrust.org 0000-0001-5108-2032 2026-04-30 eng This dataset details approved records from the Shark Trust's Basking Shark Project. This dataset is in part comprised of records from the Marine Conservation Society's Basking Shark Watch (1986-2018), and data provided from the Manx Whale and Dolphin Watch. Comprised of citizen science observations, records of Basking Sharks (sighted from land or at sea) from around the world have been complied to help better understand this species. Data comes mostly from ad-hoc records, with some observations recorded from more structured surveys and data uploads from partner organisations. Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml social participation Chondrichthyes CABI Thesaurus Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License. Creative Commons Attribution 4.0 International https://spdx.org/licenses/CC-BY-4.0.html CC-BY-4.0 http://www.baskingsharks.org Global, with a participation bias from the British Isles. -180 180 90 -90 1986-01-01 2024-12-31 Basking Sharks - Cetorhinus maximus species Cetorhinus maximus Basking Shark This dataset feeds a better understanding of this species, allowing for insights into historic movements and sighting patterns. The Shark Trust’s Basking Shark Project compiles records of Basking Shark observations from around the British Isles and further afield. This feeds a better understanding of this species, allowing for insights into historic movements and sighting patterns. This data is comprised of three tables: Event, Occurrence and extended measurements or facts. The measurementType 'WMOSeaState' describes the condition of the sea-surface, which can influence the ability of observers to spot and accurately identify sharks. The field 'identificationVerificationStatus' flags whether the record had any evidence to prove the species ID. Accepted evidence includes a photograph, specimen or expert ID and all records are approved following an internal QC process.Due to duplication of effort within the dataset from users submitting to multiple organisations or multiple users reporting the same shark, this data has undergone a quality control process whereby any assumed duplicate data (identified by being within 1km on the same day) has been removed, with the record with the highest quantity retained. If you would like access to the full dataset including duplicates, please contact conservation@sharktrust.org. This dataset would not be possible without the contributions of all citizen scientists and organisations that have participated. Whether reporting one ad-hoc find or multiple records over the span of years, every record has helped build towards this combined dataset. This data is in part comprised of data from other organisations, including the Marine Conservation Society's Basking Shark Watch (1986-2021) and data provided by the Manx Whale and Dolphin Watch.Data transformation and publication was funded by the European Union under the Horizon Europe Programme with Grant Agreement No. 101112823 (DTO-BioFlow) through an FSTP call. Each subsequent year of data will be uploaded once internal QC has been completed. annually Harriet Allen Shark Trust Data Analyst

4 Creykes Court, 5 Craigie Drive Plymouth Devon pl13jb GB

conservation@sharktrust.org Harriet@sharktrust.org 0000-0001-5108-2032 Cat Gordon Shark Trust Senior Conservation Officer

4 Creykes Court, 5 Craigie Drive Plymouth Devon pl13jb GB

cat@sharktrust.org NA Data is generated from citizen science observations. Many are ad-hoc observations, while some areas are more regularly surveyed using a standardised methodology. The majority of observations are from shore based sightings, with some being from boat or air. Records are gathered from citizen science observations submitted on an ad-hoc basis, with some recorders and/or partner organisations undertaking more regular, structured surveys. All data has been approved by a member of staff before publication. All records have undergone internal Quality Checks, with checks made against known species range and pin location checked and adjusted as required. Harriet Allen 0000-0001-5108-2032 owner Cat Gordon owner The Shark Trust’s Basking Shark Project engages citizen scientists in recording observations of Basking Sharks from around the world. This contributes to a better understanding of this species, such as regional seasonality and key areas of habitat use. Historic funders include: Countryside Council for Wales, DTO Bio-Flow, Esmée Fairbairn Foundation, Ken Watterson, National Lottery Heritage Fund, Natural England, Project AWARE, Save Our Seas Foundation and donations received through the Big Give's Green Match Fund and through specific Shark Trust appeals and adpotion programme. Global, with a participation bias from the British Isles. Citizen science observations. Many are ad hoc finds, while some areas are more regularly surveyed using a standardised methodology. 2026-03-30T16:52:28.642+01:00 dataset Allen H, Gordon C (2026). Basking Shark Project - global citizen science observations of Cetorhinus maximus. Version 1.1. Shark Trust. Samplingevent dataset. https://www.dassh.ac.uk/ipt/resource?r=st_baskingsharkproject&v=1.1 https://www.dassh.ac.uk/ipt/logo.do?r=st_baskingsharkproject https://www.dassh.ac.uk/ipt/resource?id=st_baskingsharkproject/v1.1.xml