Merman Conservation Expeditions Ltd
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Pelagia Logbook: June 2025 update on the ongoing Pelagia noctiluca jellyfish bloom in the Aegean sea

29/6/2025

 
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The bloom of the Mauve Stinger jellyfish, Pelagia noctiluca, continues in the Aegean Sea. New observations have been added to the Pelagia Logbook, helping us understand the extent and movement of this natural phenomenon.

📍 See where sightings have been recorded
📊 Follow monthly updates
🔎 Learn how to identify and stay safe

➡️ Check the full update here:
https://www.mermanconservation.co.uk/pelagia-logbook-aegean-sea-2025.html

🙏 Thank you to all citizen scientists and observers contributing to the effort. Every sighting counts!

#PelagiaNoctiluca #PurpleJellyfish #AegeanSea #JellyfishBloom #PelagiaLogbook #CitizenScience #MermanConservation

At the Heart of the Mauve Stinger Bloom at Milina (Greece) | Observation from June 18, 2025

19/6/2025

 
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© Chris Taklis - Pelagia noctiluca
Our team at Merman Conservation Expeditions Ltd. recorded a striking jellyfish bloom yesterday afternoon in the Pagasetic Gulf. In the waters just off Milina, more than 30 mauve stingers (Pelagia noctiluca) were observed gathering approximately 20 meters from the beach, while swimmers were still enjoying the sea.

This local observation appears to be part of a wider bloom event that is now expanding beyond the Pagasetic Gulf toward northern Evia and parts of the Sporades. The density and behavior of the jellyfish suggest that this bloom may continue to spread in the coming days.

The mauve stinger is a well-known species in the Mediterranean, recognizable for its translucent body with pink or purple markings and its bioluminescent glow. Although small, it can deliver a painful sting and occasionally forms dense swarms that impact both swimmers and fisheries.

We will continue to monitor the bloom and provide updates as its extent becomes clearer. Events like this remind us how dynamic and unpredictable marine ecosystems can be, especially during the warmer months.
​
Stay informed and stay mindful when entering the sea.

Mediterranean Jellyfish Bloom: Why is Pelagia noctiluca back and so soon?

6/6/2025

 
Our 2025 records show an early and intense bloom of the Purple Jellyfish (Pelagia noctiluca) across the coasts of France, Spain, Italy, and the Adriatic Sea, echoing the infamous summer outbreak of 2020, but starting earlier than expected.

🟣 Comparison with 2020:
In 2020, Pelagia blooms peaked around late June to August, particularly along the Tyrrhenian and Ligurian coasts, Catalonia, and southern France. This year, observations are already flooding in by early May – a significant shift forward.

📈 Why Is It Happening Earlier?
Unlike the typical 12-year cycle theorized for large-scale blooms, recent patterns show Pelagia populations can surge in shorter intervals due to:

🔥 Rising sea temperatures in the Western Mediterranean in some areas already exceed 21°C in May.

🌬️ Weak winter storms and early spring calm seas, allowing jellyfish polyps to mature undisturbed.

🧪 High nutrient levels from spring river outflows, fueling zooplankton, their primary food source.

France:
Reports along the Provence and the Côte d'Azur, particularly dense near estuaries.

Spain: Sightings are increasing along the Costa Brava, Almeria, and Valencia.
Italy: Strong presence already confirmed around Tuscany.

📊 We are now mapping the bloom in real time. Early intervention through citizen science is crucial for monitoring and public safety.

📍 View our Mediterranean heatmap.
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Mauve Stinger Jellyfish (Pelagia noctiluca) Update – Pagasetic Gulf, May 2025

27/5/2025

 
We’ve created a heatmap showing where Pelagia noctiluca (Mauve Stinger Jellyfish) has recently been reported in the Pagasetic Gulf and surrounding areas.

The map shows:
📍 Where the jellyfish have been seen
📈 How much – from isolated sightings to mass blooms

📸 Upload your photo to iNaturalist!
Every observation helps science and conservation.
→ https://www.inaturalist.org/

#Jellyfish #PelagiaNoctiluca #Pagasitikos #iNaturalist #MermanConservation #MarineLifeGreece #CitizenScience
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Heatmap of confirmed Pelagia noctiluca observations in the Pagasetic Gulf, from April 30th to May 27th, 2025. Abundance ranges from isolated individuals to mass sightings, indicating an active bloom in the region.

Possible Mauve Stinger Jellyfish Bloom in the Pagasetic Gulf (Greece).

9/5/2025

 
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Screenshot from video footage of Pelagia noctiluca in the Pagasetic Gulf.
Yesterday, Merman Conservation Expeditions Ltd officially informed the Greek Ministry of Environment, NECCA, and the Volos Coast Guard about a possible new local emergence of Mauve Stinger jellyfish (Pelagia noctiluca) in the Pagasetic Gulf.

Given the strong stigma and collective memory of the prolonged jellyfish bloom from 2020 to 2023, we believe it is essential to act early, monitor closely, and provide timely, science-based information to the public and relevant authorities.

Our goal is to support local communities, marine users, and decision-makers with up-to-date data and responsible environmental reporting. We urge the public to remain calm, respect marine wildlife, and report any unusual sightings to us or local authorities.

📸 Have you seen jellyfish in the area?

Please upload your observations to iNaturalist:
👉 https://www.inaturalist.org/

Your photos and reports help us monitor the situation more effectively and contribute to real-time biodiversity tracking.

#MermanConservation #JellyfishBloom #PelagiaNoctiluca #PagaseticGulf #MarineMonitoring #Greece #CitizenScience

Exciting news: "Μέδουσες στην Έλλαδα" (Jellyfish in Greece) app now managed by Merman Conservation Expeditions Ltd!

22/1/2025

 
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We are thrilled to announce that the popular Greek android app "Μέδουσες στην Έλλαδα" (Jellyfish in Greece) has officially transitioned to Merman Conservation Expeditions Ltd from BiodiversityGR. This marks a significant step forward in ensuring the app continues to deliver accurate and up-to-date information about jellyfish and similar marine species in Greece.

Why this matters?

The Jellyfish in Greece app has been a cornerstone for:
  • Education: Helping the public identify jellyfish species and understand their role in marine ecosystems.
  • Citizen Science: Empowering users to report jellyfish sightings, contributing valuable data to scientific research.
  • Awareness: Providing insights into the potential risks of certain species and promoting safe practices at sea.

By transferring the app's management to Merman Conservation Expeditions Ltd, we are ensuring its continued functionality and enhancement, aligning with our mission to promote marine conservation and education.

What’s new?

Under Merman Conservation Expeditions Ltd, we aim to:
  • Enhance features: Introduce new functionalities to improve user experience and engagement.
  • Update information: Regularly update the app’s database with the latest scientific data on jellyfish and related species.
  • Strengthen citizen science efforts: Provide tools for easier reporting and analysis of jellyfish sightings.

How you can help?

Your participation is vital to the success of this initiative. Here’s how you can contribute:
  1. Download the App: If you haven’t already, download "Μέδουσες στην Έλλαδα" from the Google Play Store.
  2. Report Sightings: Use the app to log jellyfish sightings in inaturalist and provide as much detail as possible.
  3. Spread the Word: Share the app with friends and family to expand its reach and impact.

Acknowledgments

We extend our gratitude to BiodiversityGR and Taklis Christos for their efforts in developing and managing the app thus far. Their dedication has laid a strong foundation for us to build upon.

Together, let’s continue to explore, protect, and understand the incredible marine biodiversity of Greece. 
For more information about our projects and initiatives, visit Merman Conservation Expeditions Ltd.

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Company

Merman Conservation Expeditions LTD

Company Number: SC787239
UK Register of Learning Providers Number UKPRN: 10096857
Bluesky

Contact

UK: +44 (0) 7475353130    Greece: +30 6945927483

M-F: 10am - 18pm (London Time)


Registered Address

South Charlotte Street
Edinburgh, 
EH2 4AN

FIELD Research Base

Liri, Magnesia
Greece, 37006

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  • Home
  • About us
    • About the Company
    • Certifications, Licenses & Permits
    • Company mission
    • Conference Participation
    • Consultations Timeline
    • Partners
    • Wildlife Services Code of Conduct
    • Zoologica Nexus Lab
  • Blog
  • Citizen Science Projects
    • Exotic Encounters: Mapping Alien Species
    • Greek Shark Logbook
    • Pelagia Logbook: Aegean Sea 2025
    • Seal Quest
    • Sharks in Scotland
    • Wildlife Observations Of Pelion (WOOP)
    • Wildlife of UK
  • Events
    • Events Map
    • Private Nature Tours & Field Experiences
    • Wildlife Recovery Survey in Pelion, Greece
  • Resources
    • Apps
    • Data Repository
    • Digital Library >
      • Conservation Guides
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      • Science & Technology in Conservation
      • Species Impact Indicators
      • Species Management Proposals
    • Outreach Material
    • Podcast
    • Publications
    • Reporting Forms
    • Survey Monitoring Sheets
  • Contact
  • Wildlife Conflict AI Agent Advisor