Health assessment of fan mussels in the southern part of the Sea of Marmara

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Publiée : Απρ 30, 2025
DOI : https://doi.org/10.12681/mms.38406
UĞUR KARADURMUŞ
Department of Underwater Technology, Maritime Vocational School, Bandırma Onyedi Eylül University, Balıkesir, Türkiye
https://orcid.org/0000-0002-5827-0404
SELIN ERTÜRK GÜRKAN
Department of Biology, Faculty of Sciences, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye
MERT GÜRKAN
Department of Biology, Faculty of Sciences, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye
İBRAHIM ENDER KÜNİLİ
Department of Fishing and Processing Technology, Faculty of Marine Science and Technology, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye
EMRE TURGAY
Department of Aquaculture and Fish Diseases, Faculty of Aquatic Sciences, Istanbul University, Istanbul, Türkiye
MUSTAFA SARI
Department of Maritime Business Administration, Faculty of Maritime, Bandırma Onyedi Eylül University, Balıkesir, Türkiye
Résumé

The fan mussel (Pinna nobilis Linnaeus, 1758), a critically endangered species in the Mediterranean Sea, has experienced mass mortality events (MME) due to various pathogens, particularly the protozoan parasite Haplosporidium pinnae. Despite these challenges, the Sea of Marmara (SoM) still has significant populations of fan mussels, with no infection-related MME reported so far. This study aimed to assess the general health status of fan mussels in the SoM and understand the factors that contribute to their survival. The samples were collected on September 25, 2023, around the Kapıdağ Peninsula in the southern part of the SoM, a critical area for fan mussel populations, where a total of 20 live specimens were included in advanced laboratory analysis from four stations. Findings revealed that Haplosporidium and Mycobacterium species were present in P. nobilis across all stations, with higher oxidative stress indicators in the digestive gland tissues. Results also observed different life stages of Haplosporidium in the mantle and digestive gland. Molecular analyses revealed the presence of haplosporidian parasites, Perkinsus sp., and Mycobacterium sp. in some samples. Phylogenetic analysis showed that Haplosporidium isolates form a distinct clade separate from H. pinnae, suggesting they belong to a different species. The detected Haplosporidium species in the SoM displayed genetic differences from H. pinnae found in the Mediterranean Sea, potentially indicating a less virulent variant. This study raised the question of whether interactions between the detected Haplosporidium parasite and other pathogens or region-specific ecological characteristics were effective in the absence of a mass mortality in fan mussels in the SoM.

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  • Early View_vol. 26, n. 3, 2025

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