Predictive Model for the Nematode (Hysterothylacium aduncum) in Horse Mackerel, Trachurus trachurus From the Black Sea

Abstract

Hysterothylacium aduncum is a parasitic nematode that infects mainly marine fish. The information on the heterogeneity in the aggregation of macroparasites in fish species is still limited, particularly for the Raphidascarid nematode H. aduncum that infects exploitable marine fish species including horse mackerel (Trachurus trachurus). This study aimed to investigate the heterogeneity of the distribution of H. aduncum to understand macroparasite aggregation better in marine fish. Weibull tests comprising Maximum likelihood were used to analyze the frequency distribution of parasites within a fish host population over the three years period. The parasite, H. aduncum (third larval stage) prevalence was found to be 88% and the condition factor was 1.30∓0.029 in un-infected fish and 1.12∓0.022 in infected fish. The clustered pattern was observed in H. aduncum in horse mackerel. The relation between parasite load and the fish condition factor was found to be significant and conformity of length and weight was affected by parasite load. It is the first time that aggregation has been observed in H. aduncum distribution and made forecasts of nematode intensity in horse mackerel. The findings related to the large individual variations suggest that this pattern is significant and should be considered for host-parasite dynamics.

Keywords

• Parasite load
• Hysterothylacium aduncum
• Weibull
• Horse mackerel

Karadeniz'den Yakalanan İstavrit, Trachurus trachurus Balıklarında Bulunan Nematod (Hysterothylacium aduncum) İçin Tahmin Modeli

Öz

Hysterothylacium aduncum esas olarak deniz balıklarını etkileyen parazitik bir nematoddur. Balık türlerinde makroparazitlerin agrigasyonundaki heterojenliğe ilişkin bilgiler, avcılığı yapılan deniz balığı türlerini enfekte eden H. aduncum için istavrit (Trachurus trachurus) de dahil olmak üzere hali hazırda sınırlıdır. Bu çalışma, deniz balıklarında makroparazit agregasyonunun daha iyi anlaşılması için H. aduncum'un dağılımındaki heterojenliğin araştırılmasını amaçlamaktadır. Üç yıllık dönem boyunca bir konakçı balık popülasyonunda parazitlerin sıklık dağılımını analiz etmek için Maksimum olasılığı içeren Weibull testleri kullanılmıştır. Parazit H. aduncum'un (üçüncü larva evresi) prevalansı %88, kondisyon faktörü enfekte olmayan balıklarda 1,30∓0,029, enfekte balıklarda 1,12∓0,022 olarak bulunmuştur. İstavrit balığında bulunan H. aduncum varlığında kümelenmiş model gözlenmiştir. Parazit yükü ile balık kondisyon faktörü arasındaki ilişkinin önemli olduğu ve boy-ağırlık uyumunun parazit yükünden etkilendiği görülmüştür. H. aduncum dağılımında ilk kez agregasyon olgusu gözlemlenmiştir ve istavritteki nematod yoğunluğuna ilişkin tahminler yapılmıştır. Büyük bireysel varyasyonlarla ilgili bulgular, bu modelin anlamlı olduğunu ve konak-parazit dinamikleri için dikkate alınması gerektiğini belirtmektedir.

Anahtar Kelimeler

• Parazit yükü
• Hysterothylacium aduncum
• Hysterothylacium aduncum
• İstavrit

Kaynakça

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