Türkiye’nin Karadeniz kıyısından sivriburun karagözün böbreğinde bir Myxobolus türünün ilk kaydı

Abstract

Myxobolus Bütschli, 1882 en fazla türe sahip myxozoan cinsi olmakla birlikte, sparid balıklardan tanımlanmış tür sayısı azdır. Bu çalışmada, Türkiye’nin Karadeniz kıyısından avlanmış sivriburun karagöz (Diplodus puntazzo) balığının böbreğinde tespit edilen bir Myxobolus türünün morfolojik ve moleküler olarak karakterize edilmesi amaçlanmıştır. Şubat–Mart 2026 tarihleri arasında dokuz balık myxosporean enfeksiyonu yönünden incelenmiş ve böbrekte Myxobolus sporları %88.9 (8/9) prevalansla saptanmıştır. Olgun sporlar elipsoidal biçimde ve kaudal uzantılar taşımamakta olup, 10.1 ± 0.6 (8.9–11.2) µm boyunda, 5.7 ± 0.6 (4.5–6.7) µm eninde ve 5.1 ± 0.6 (4.5–6.6) µm kalınlığında ölçülmüştür. İki eşit boyutlu ve armut biçiminde olan kutup kapsülleri 3.7 ± 0.2 (3.0–4.0) µm boyunda ve 2.0 ± 0.1 (1.7–2.2) µm eninde ölçülmüştür. Kısmi küçük alt birim ribozomal DNA (SSU rDNA) dizi verilerine dayalı moleküler analizlerde, parazit en yüksek benzerliği Myxobolus branchiostegi ile göstermiş, bunu M. iwagiensis ve M. tai izlemiştir. Filogenetik analizlerde ise bu üç türle birlikte güçlü desteklenen bir klad içinde, diğer denizel myxobolid türlerinden ayrı olarak konumlanmıştır. Morfolojik ve moleküler bulgular, parazitin Myxobolus cinsi içinde yer aldığını göstermektedir. Ancak burada elde edilen dizi, SSU rDNA geninin yalnızca bir bölümünü kapsaması nedeniyle tür düzeyinde tanımlama için yeterli değildir. Bu çalışma, D. puntazzo’dan bir Myxobolus türüne ait ilk genetik veriyi ve bu konaktan Karadeniz’de cinsin yeni bir kaydını sunmaktadır.

Keywords

• Myxozoa
• Myxobolidae
• SSU rDNA
• Sparidae
• Yeni coğrafi kayıt

Supporting Institution

Bu araştırmanın yürütülmesi için herhangi bir kurum veya kuruluştan destek alınmamıştır.

Ethical Statement

Bu çalışma için etik kurul izni gerekmemektedir.

First record of a Myxobolus species in the kidney of sharpsnout seabream from the Black Sea, Turkey

Abstract

Myxobolus Bütschli, 1882 is the most species-rich myxozoan genus, but few of its species have been described from sparid fishes. The aim of the present study was to characterise, using morphological and molecular methods, a Myxobolus species detected in the kidney of the sharpsnout seabream Diplodus puntazzo caught on the Black Sea coast of Turkey. Between February and March 2026, nine fish were examined for myxosporean infection, and Myxobolus spores were detected in the kidney with a prevalence of 88.9% (8/9). Mature spores were ellipsoidal and lacked caudal appendages, measuring 10.1 ± 0.6 (8.9–11.2) µm in length, 5.7 ± 0.6 (4.5–6.7) µm in width and 5.1 ± 0.6 (4.5–6.6) µm in thickness. The two equal and pyriform polar capsules measured 3.7 ± 0.2 (3.0–4.0) µm in length and 2.0 ± 0.1 (1.7–2.2) µm in width. Molecular analyses based on partial small subunit ribosomal DNA (SSU rDNA) sequence data showed the highest similarity to Myxobolus branchiostegi, followed by M. iwagiensis and M. tai. In the phylogenetic analyses it was placed within a strongly supported clade together with these three species, separate from other marine myxobolid species. The morphological and molecular findings place the parasite within the genus Myxobolus. However, the sequence obtained here covers only part of the SSU rDNA gene and is therefore insufficient for species-level identification. This study provides the first genetic data for a Myxobolus species from D. puntazzo and a new record of the genus from this host in the Black Sea.

Keywords

• Myxozoa
• Myxobolidae
• SSU rDNA
• Sparidae
• New geographic record

Supporting Institution

No funding was received from institutions or agencies for the execution of this research.

Ethical Statement

No ethics committee permission is required for this study.

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