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Marine Science

NEW INSIGHTS INTO THE REPRODUCTION AND POPULATION STRUCTURE OF THE PEARL OYSTER

NEW INSIGHTS INTO THE REPRODUCTION

New Insights into the reproduction and population structure of the pearl oyster Pinctada radiata in the Evia Gulf. 

Department of Ichthyology and Aquatic Environment

As part of the doctoral dissertation by PhD candidate Dimitrios Pafras, under the supervision of Associate Professor Dimitrios Klaoudatos, two significant scientific studies were recently completed and published.

Interview with Dimitrios Pafras

Can you provide a general overview of these two studies?
Our recent studies focus on the pearl oyster Pinctada radiata, an alien species with significant ecological and economic importance. The first study investigates its reproductive cycle in the Euboean Gulf, providing valuable insights into its reproductive behaviour and patterns. This is the first such research conducted in Greece, enhancing our understanding of the species’ biology. The second study examines the population structure of Pinctada radiata in the northern and southern parts of the Evia Gulf, analysing its geographic distribution and population dynamics. Both studies offer critical data to support effective management and conservation of the species.

What were the main findings of your first study on the reproduction of the pearl oyster?
In our first study, we discovered that Pinctada radiata exhibits a unique reproductive cycle adapted to the environmental conditions of the Evia Gulf. Specifically, we identified reproductive activity periods linked to key environmental parameters, such as temperature. These findings enable a deeper understanding of when and under what conditions the species reproduces, which is crucial for developing management and conservation strategies.

How do you believe this study contributes to the broader scientific community?
Our study provides a foundational dataset on the reproduction of Pinctada radiata, which was previously unavailable for the Greek region. This data is critical for advancing research and developing management practices applicable to other areas with similar ecological characteristics. Additionally, the study contributes important insights into the ecology of an alien species, helping to understand its interactions with local ecosystems and assess its ecological footprint.

What did your research on the population structure of the pearl oyster reveal?
In our second study, we focused on analysing the population structure of Pinctada radiata in the southern Evia Gulf. We collected and analysed data from a specific geographic area and identified significant information regarding the distribution and population structure of the species. This research provides a framework for developing effective management and conservation strategies. By understanding population structure, we can pinpoint critical areas for the survival and reproduction of Pinctada radiata and take measures to protect them.

The Importance of Pinctada radiata in the Mediterranean and Its Impact on Fisheries in the Southern Evia Gulf

The pearl oyster (Pinctada radiata), also known as the Atlantic pearl-oyster, belongs to the bivalve mollusc class and originates from the Indo-Pacific region. Since the 19th century, it has been recorded in the Mediterranean as a non-native species. It typically inhabits shallow waters at depths of 3-15 meters. Its size ranges from 40 to 55 mm, although it can exceed 100 mm.

Shellfish fishing is a vital economic activity supporting numerous professionals. The southern Evia Gulf boasts rich reserves of commercially valuable shellfish, though detailed information about these stocks has been limited. The main commercially fished species include clams, mussels, oysters, and scallops. The study area experiences significant fishing pressure, as it hosts approximately 10% of the Greek fishing fleet, with 1,400-1,700 fishers, making it an economically significant region for the fishing sector. However, local stakeholders have observed a decline in fish stocks, threatening the economic sustainability of the industry.

The introduction of Pinctada radiata fisheries earlier this year represents a promising development for professional fishers. This new shellfish species, now legally harvestable, has the potential to provide substantial economic benefits, offering a new income source during a period when traditional shellfish populations have significantly declined.

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