Influence of the host sex, size, and season on Ergasilus lizae infestation of Thicklip Grey Mullet (Chelon labrosus, L., 1758) in Beymelek Lagoon Lake (Antalya, Türkiye)

Abstract

The aim of the study was investigation of the changes in infestation levels of Ergasilus lizae on economically important fish species, thicklip grey mullet (Chelon labrossus) from Beymelek Lagoon Lake located on the western Mediterranean coast (Antalya, Türkiye). In this context, the infestation levels of E. lizae with respect to fish sexes, fish sizes and season were evaluated statistically. The research was conducted seasonally between May 2008 to April 2009, and the gills which belong to 103 fish samples were examined. The overall infection prevalence and mean intensity values were 60.2% and 15.95, respectively. The prevalence and mean intensity of E. lizae for thicklip grey mullet male and sexually unidentified fish samples were higher than that for females. Prevalence and mean intensity were determined the highest in size class I with 69.6% and 26.3, and almost the same values in size groups II and III. E. lizae on host fish were observed in every season. The highest prevalence and mean intensity of E. lizae was recorded in spring with 100%, 24.88. The lowest prevalence of E. lizae was recorded in summer at 12% and the lowest mean intensity of E. lizae was in the summer and the winter with 9, 8.67 respectively. The infestation level of E. lizae was statistically significant with host sex and season, but there was no effect on the fish size groups.

Keywords

• Ergasilus lizae
• Chelon labrosus
• Infestation
• Beymelek Lagoon
• Türkiye

Beymelek Lagün Gölü'ndeki (Antalya, Türkiye) Kalın Dudaklı Kefal (Chelon labrosus, L., 1758)’de Ergasilus lizae Kroyer, 1863 (Copepoda: Ergasilidae) enfestasyonu üzerine konak cinsiyeti, büyüklüğü ve mevsimin etkisi

Öz

Bu çalışmada, Batı Akdeniz kıyısında (Antalya, Türkiye) yer alan Beymelek Lagün Gölü'nde yaşayan ekonomik öneme sahip bir balık türü olan kalın dudaklı kefal (Chelon labrossus) üzerindeki Ergasilus lizae enfestasyon seviyesindeki değişimler araştırılmıştır. Konak balık cinsiyeti, konak balık büyüklüğü ve mevsime göre E. lizae'nin enfestasyon seviyesi istatistiksel olarak değerlendirilmiştir. Çalışma mevsimsel olarak Mayıs 2008 ile Nisan 2009 tarihleri arasında yürütülmüş ve 103 balık örneğine ait solungaç incelenmiştir. Toplam yaygınlık ve ortalama yoğunluk değerleri sırasıyla % 60,2 ve 15,95 olarak bulunmuştur. Erkek ve cinsiyeti belirlenemeyen balık örneklerinde E. lizae yaygınlığı ve ortalama yoğunluğu dişilerden daha yüksek bulunmuştur. Boy gruplarına göre, yaygınlık ve ortalama yoğunluk % 69,6 ve 26,3 ile I. boy sınıfında en yüksek, II. ve III. boy gruplarında ise hemen hemen aynı değerlerde tespit edilmiştir. Konak balık üzerindeki E. lizae her mevsimde gözlenmiştir. En yüksek E. lizae yaygınlığı ve ortalama yoğunluğu %100 ve 24,88 ile ilkbaharda kaydedilmiştir. En düşük E. lizae yaygınlığı %12 ile yaz mevsiminde, en düşük ortalama E. lizae yoğunluğu sırasıyla 9 ve 8,67 ile yaz ve kış mevsimlerinde kaydedilmiştir. E. lizae'nin enfestasyon seviyesi konakçı cinsiyeti ve mevsim ile istatistiksel olarak önemli bulunurken, balık büyüklük gruplarının etkisi görülmemiştir.

Anahtar Kelimeler

• Ergasilus lizae
• Chelon labrosus
• Enfestasyon
• Beymelek Lagoon
• Türkiye

Kaynakça

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