Dataset Details - The Ray Project - Shark, Skate and Ray Egg case Records
This dataset is comprised of the variety of skate and ray egg casings found on Wexford beaches through survey work. It includes the number of egg casings found from each species that has been identified in the process of the examination of the casings. The species found include Small-spotted catshark (Scyliorhinus canicular), Thornback ray (Raja clavata), Small-eyed ray (Raja microocellata), Blonde ray (Raja brachyura), Spotted ray (Raja montagui), Undulate ray (Raja undulata) and Cuckoo ray (Leucoraja naevus).
The data was originally collected to establish what species of ray and skate are still present off the coast of Ireland specifically Wexford. The data collected in this study also has the potential to lead to thorough searches being conducted all around the Irish coast along with further research on Elasmobranchs specific breeding habits, depending on the species found.
All survey sites were located on beaches along the coast of Wexford. The methodology conducted involved following two transect lines along the site. The first line is located 1m away from the present embryonic dunes and the second is located along the upper strand line. Egg casings are collected approximately 3 metres either side of the transect lines. This ensures egg casings present throughout the beach are collected in a similar manner each collection. The egg casings then need to be soaked in water for 24hrs before attempting to identify them. Separating the prominent species, then each egg casing is placed into a right-angle ruler on a white background. A photo is taken whilst species identification takes place by studying the size, presence of keel and presence of attachments of each casing. Once all egg casings have been identified and divided, the average size is recorded, and all information is uploaded to the egg hunt form.
The geographic extent and coverage include the described transects on the following beaches on the coast of Wexford, Cahore South Beach, Morris Castle Beach, Curracloe beach, Old Bawn Beach, Ballinoulart Bay Beach, Askingarran Lower Bay Beach, Ballinoulart Bay Beach and Fodagh Bay Beach.
25th of April to the 21st of July 2021
The same methodology and search effort was followed during each survey. All casings stored for 24-hour water soakage were labelled so as to avoid confusion and ensure accuracy. The process of identification was completed with the use of a widely accepted and utilised identification key sourced from Shark Trust. The same process was used for each egg casing and a photograph was taken for certainty of correct species identification. All calculations were checked by two members for accurate records of species numbers.
For additional information about this data the website www.therayproject.org can be reviewed or one can contact firstname.lastname@example.org or email@example.com via email.
Open (Creative Commons CC-BY 4.0)
The Ray Project, The Ray Project - Shark, Skate and Ray Egg case Records, National Biodiversity Data Centre, Ireland, accessed 27 September 2023, <https://maps.biodiversityireland.ie/Dataset/361>
Dataset species distribution
Terrestrial Map - 10kmDistribution of the number of species recorded within each 10km grid square (ITM).
Marine Map - 50KmDistribution of the number of species recorded within each 50km grid square (WGS84).
Dataset record distribution
Terrestrial Map - 10kmDistribution of the number of records within each 10km grid square (ITM).
Marine Map - 50KmDistribution of the number of records within each 50km grid square (WGS84).
Records per year
Species per year
|SurveyId||Title||Data Capture Period||Species||Records|
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|Number of Cases||Abunndance of indivual egg casings found for each species|
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