e94ccbe8-4a72-4399-8126-8a83242a1f80 MSLW Merman Conservation Expeditions Ltd Christos Taklis Director info@mermanconservation.co.uk https://orcid.org/0000-0001-9181-0292 Merman Conservation Expeditions Ltd Christos Taklis Director info@mermanconservation.co.uk https://orcid.org/0000-0001-9181-0292 2025-12-25 en This dataset contains all validated citizen science records of the mauve stinger jellyfish Pelagia noctiluca collected along the Welsh coast during 2025 as part of the Mauve Stinger Logbook Wales project by Merman Conservation Expeditions Ltd. Records include date, location, and observation details submitted by the public and reviewed by project staff. The dataset documents the spatial and seasonal occurrence of this species in Welsh waters and is preserved as a permanent scientific archive. mauve stinger Pelagia noctiluca Jellyfish Bloom None CC BY 4.0 https://creativecommons.org/licenses/by/4.0/ Data on Figshare https://doi.org/10.6084/m9.figshare.30948461 Data download https://figshare.com/ndownloader/files/60612644 DOI https://doi.org/10.48372/XTRJ-V636 Wales -5.73 -2.65 53.43 51.36 0 0 meter 2025-08-13 2025-11-08 Species Pelagia noctiluca Mauve Stinger WoRMS AphiaID: 135252 Data collection Smartphone Coastal and nearshore waters of Wales, covering the Irish Sea and Bristol Channel. Merman Conservation Expeditions Ltd Christos Taklis Director Observations Date The date when the species observation was made. Species Name The scientific species name recorded for this observation in Mauve Stinger (Pelagia noctiluca). Abundance A categorical estimate of the number of individuals observed, recorded using predefined classes: Isolated 1 to 2, Few 3 to 10, Several 11 to 30, Many 31 to 100, and Mass more than 100. Count The number of individual organisms counted by the observer during the observation. Latitude The geographic latitude of the geographic center of a Location (in decimal degrees, using the spatial reference system WGS84). Positive values are north of the Equator, negative values are south of it. Legal values lie between -90 and 90, inclusive. Longitude The geographic longitude of the geographic center of a Location (in decimal degrees, using the spatial reference system WGS84). Positive values are east of the Prime Meridian, and negative values are west of it. Legal values lie between -180 and 180, inclusive. Location Name The specific description of the place. This term may contain information modified from the original to correct per ceived errors or standardize the description. Country The name of the country or major administrative unit in which the Location occurs. Observer Name The name of the person who recorded the observation. Source The source of the record is provided as a link to where the observation was first published, such as Facebook post, and iNaturalist observation, or a news article. csv