Yesterday’s dive survey along the coasts of Agrielia and Neraki in South Pelion focused on documenting nudibranch diversity, as part of an ongoing seasonal monitoring project. While the waters were teeming with life across multiple taxa, the nudibranch yield was notably lower than in previous years for this time of season.

This post summarizes the species observed, categorized by type with scientific names italicized and common names in parentheses.

🐌 Nudibranchs & Sacoglossans

Despite targeted efforts, the number of nudibranch taxa was relatively low. This may be due to seasonal variability, temperature shifts, or local ecological pressures or factors we’ll continue monitoring closely in the coming weeks.

• Elysia timida
• Calmella cavolini
• Cratena peregrina (Wandering Cratena) 
• Flabellina affinis (Mediterranean Violet Aeolid) 
• Facelina rubrovittata  
• Nemesignis banyulensis (Lady Godiva) 

Compared to past surveys at the same sites during mid-June, both species richness and individual counts were reduced—warranting further ecological investigation.

🐟 Fish
​

• Tripterygion tripteronotum (Red-black Triplefin) 
• Thalassoma pavo (Ornate Wrasse)  
• Diplodus sargus (Sargo) 
• Sarpa salpa (Salema Porgy) 
• Oedalechilus labeo (Boxlip Mullet) 
• Diplodus vulgaris (Common Two-banded Seabream)
• Microlipophrys canevae (Caneva's Blenny) 
• Parablennius gattorugine (Tompot Blenny) 
• Epinephelus marginatus (Dusky Grouper) 

🪸 Corals & Anemones

• Cladocora caespitosa (Cushion Coral) 
• Balanophyllia europaea (Pig-tooth Coral) 
• Caryophyllia inornata (Carnation Coral) 
• Aiptasia mutabilis (Trumpet Anemone) 
• Parazoanthus axinellae (Yellow Cluster Anemone) 

🐚 Mollusks (Excl. Nudibranchs)
​

• Patella caerulea (Mediterranean Limpet) 
• Phorcus turbinatus (Turbinate Monodont) 
• Spondylus gaederopus (European Thorny Oyster) 
• Arca noae (Noah's Ark Shell) 

🧽 Sponges & Tunicates
​

• Tethya aurantium (Golf Ball Sponge) 
• Phorbas tenacior (Bluish Encrusting Sponge) 
• Clathrina clathrus 
• Microcosmus polymorphus 
• Diplosoma spongiforme 

🌪️ Polychaeta
​

• Protula tubularia (Red-spotted Horseshoe Worm) 

🌿Hydroids

• Eudendrium racemosum 

🥒 Holothuria

• Holothuria sanctori (Variable Sea Cucumber)

🌿 Algae & Marine Flora
​

• Genus Laurencia 
• Flabellia petiolata (Fan Weed) 
• Class Phaeophyceae (Brown Algae) 

Yesterday's marine biodiversity survey at Ammitsa Beach in South Pelion offered a vivid snapshot of the Mediterranean’s underwater richness. Under calm June skies and crystalline waters, our fieldwork revealed a surprisingly high diversity of species, ranging from nudibranchs to seagrasses, sponges, corals, and bony fishes.

This survey was conducted between 12:25 and 13:10 EEST and included over 36 unique taxa, highlighting Ammitsa as a thriving marine microhabitat worth continued observation and conservation attention.

Below is a list of species observed:

🐠 Fish

• Chromis chromis (Mediterranean Damselfish)
• Tripterygion melanurus (Small Triplefin Blenny)
• Sarpa salpa (Salema Porgy)
• Thalassoma pavo (Ornate Wrasse)
• Trachinotus ovatus (Pompano)
• Oblada melanurus (Saddled Seabream)
• Serranus scriba (Painted Comber)
• Diplodus puntazzo (Sharpsnout Seabream)
• Symphodus tinca (East Atlantic Peacock Wrasse)
• Diplodus vulgaris (Common Two-banded Seabream)
• Diplodus sargus (Sargo)
• Mullets (can't identify the species)
• Sparidae (can't identify the species)

🐌 Mollusks

• Conus ventricosus (Mediterranean Cone Snail)
• ​Phorcus turbinatus (Turbinate Monodont)

🐛 Nudibranchs and Sea Slugs

• Flabellina affinis (Mediterranean Violet Aeolid)
• Nemesignis banyulensis (Lady Godiva)
• Cratena peregrina (Wandering Cratena)

🪱Worms

• Galeolaria hystrix (Scarlet Tubeworm)

🪸Corals

• Cladocora caespitosa (Cushion Coral)
• Caryophyllia inornata (Carnation Coral)
• Balanophyllia europaea (Pig-tooth Coral)

🌿Algae and Marine Plants

• Posidonia oceanica (Neptune Grass)
• Acetabularia acetabulum (Mermaid's Wine Glass)
• Flabellia petiolata (Fan Weed)
• Dictyota dichotoma (Forked Ribbons)
• Padina pavonica complex

🧽Sponges

• Crambe crambe (Oyster Sponge)
• Sarcotragus spinosulus (Black Leather Sponge)
• Chondrosia reniformis (Kidney Sponge)
• Chondrilla nucula (Potato Sponge)
• Ircinia variabilis (Variable Loggerhead Sponge)

⭐Echinoderms

• Arbacia lixula (Black Sea Urchin)

🪼Hydroids

• Eudendrium racemosum

🦪 Oysters

• Ostrea edulis (European Flat Oyster)

🟨 Fungi

• Amyloporia xantha (Yellow Porecrust)

Today’s marine survey revealed a vibrant and encouraging array of marine life, highlighting signs of ecological resilience following the 2023 floods.

Below is a list of species observed:

🐠 Fish

• ​Lithognathus mormyrus (Striped Seabream)
• Serranus cabrilla (Comber)
• Serranus scriba (Painted Comber)
• Coris julis (Mediterranean Rainbow Wrasse)
• Thalassoma pavo (Ornate Wrasse)
• Chromis chromis (Mediterranean Damselfish)
• Diplodus sargus (Sargo)
• Diplodus annularis (Annular Seabream)
• Diplodus vulgaris (Common Two-banded Seabream)
• Sarpa salpa (Salema Porgy)
• Genus Atherina (likely Sand Smelt, species undetermined)
  
  

🪼 Invertebrates​

• Cratena peregrina (Wandering Cratena)
• Thuridilla hopei
• Chondrosia reniformis (Kidney Sponge)
• Family Serpulidae (Serpulid Tubeworms)
• Leucothea multicornis (Comb Jelly)
  

​🪸 Algae, Seagrasses & Cnidarians​

• Cladocora caespitosa (Cushion Coral)
• Asparagopsis taxiformis (Red Sea Plume) 
• Wrangelia penicillata (Pink Bush Alga)
• Acetabularia acetabulum (Mermaid’s Wine Glass)
• Posidonia oceanica (Neptune Grass)

This encouraging biodiversity snapshot underscores the importance of ongoing post-flood monitoring and habitat protection.

The September 2023 floods in Pelion, Greece, were a devastating natural disaster, with significant ecological consequences for both terrestrial and marine ecosystems in the region. Our project, Wildlife Recovery Survey: After the September 2023 Floods in Pelion (Greece), aims to assess the impact of these floods on local biodiversity through comprehensive wildlife surveys in the affected areas.

​During the marine survey conducted on October 6, 2024, the entire sea area of Theotokos Beach showed no signs of marine life, except for scattered dead leaves of Posidonia oceanica. However, a small section measuring approximately 10 meters by 4 meters was an exception. This area contained a submerged Plane tree (Platanus orientalis) and fragments of broken concrete from the boat slip, debris left behind by the September 2023 floods. Only in this zone were any fish and marine species observed, which, based on previous years' surveys, are unusually rare for this location and time of year.

Yesterday, Chris Taklis had the pleasure of being invited by KOUDRASIS FISHING to talk about the pufferfish species Lagocephalus sceleratus in Greece.

This invasive species, commonly known as the silver-cheeked toadfish, has made its way into the Mediterranean waters, posing significant challenges to local ecosystems and fisheries. In this talk, conducted in Greek, we delved into its impact, the reasons behind its rapid spread, and what measures can be taken to manage this marine intruder. If you're interested in the intriguing world of Lagocephalus sceleratus and its implications for the Greek fishing community, make sure to watch the video!