Ilorin Metropolünde Branchiomyces Türlerinin Çiftlikte Yetiştirilen Afrika Yayın Balıklarında (Clarias gariepinus) Doğal Oluşumu ve Patolojik Etkileri

Abstract

Branchiomyces türleri, balıklarda branchiomycosis'ten sorumlu mantarlardır. Balıklardaki daliyomikoz solungaçların nekrozu ve yüksek ölüm oranları ile kendini gösterir. Çiftlikte yetiştirilen balıklarda çok korkulan bir fungal hastalıktır. Bu çalışma, Ilorin metropolünde Clarias gariepinus yetiştiriciliği yapılan çiftliklerde Branchiomyces türlerinin oluşumunu ve histopatolojik etkisini araştırmak amacıyla yapılmıştır. Ilorin metropolünden rastgele otuz altı (36) çiftlik seçildi. 36 balıktan toplam 108 adet solungaç toplanmış ve Branchiomyces türlerinin varlığı incelenmiştir. Ayrıca standart yöntem kullanılarak enfekte solungaç üzerinde histolojik inceleme yapıldı. % 19,30'u temsil eden erkeklerden 57 örneğin 11'inde Branchiomyces türü bulunurken, % 33,33'ü temsil eden 51 örnekten 17'sinin enfekte olduğu belirlenmiştir. Ayrıca dişi balıklar Branchiomyces türlerinin daha fazlasını bulundurmaktaydı (dişilerde cfu/g, erkeklerde cfu/g). Erkek balıklar dişilerden daha uzun ve geniş lamellere sahiptir (p > 0.05). Erkek dişi lamel uzunluğuna ve genişliğine sahiptir (p>0.05). Solungaçlarda, gözlemlenebilir lezyon,yaygın çoğalma, marjinal damar kanalının kanlı yoğun genişlemesi ve sekonder solungaç lamellalarının düzensizliği görülmüştür. Çalışma, çiftlikte yetiştirilen Afrika yayın balıklarında Branchiomyces türlerinin varlığının yüksek olduğunu göstermiştir. Enfekte balıkların solungaçları değişikliklerin erken safhalarını içermektedir. Solungaç histomorfometrisi, lamellerin etkilendiğini ve bu durumun solunum bozukluğuna yol açabileceğini göstermiştir.

Keywords

• Branchiomyces türleri,Clarias gariepinus,solungaç,enfeksiyon

Natural Formation and Pathological Effects of Branchiomyces Species in Farm-grown African Catfish (Clarias gariepinus) in Ilorin Metropolis

Abstract

Branchiomyces species are the fungi responsible for branchiomycosis in fish. Branchiomycosis in fish is manifested by necrosis of the gills, and high incidences of mortality. It is a highly feared fungal disease of fishes in fish raising farms. This study is to investigate the occurrence and histopathological effect of Branchiomyces species in farm raised Clarias gariepinus in Ilorin metropolis. Thirty-six (36) farms were selected randomly from Ilorin metropolis. A total number of 108 gills were collected from 36 fish and examined for the presence of Branchiomyces species. Furthermore, histological examination was carried out on infected gillsby using standard methods. Eleven out of 57 samples from males representing 19.30% were infected with Branchiomyces species while 17 out of 51 samples from females representing 33.33% were infected. Also, females had higher load of Branchiomyces species ( cfu/g) and males had cfu/g. There was significant difference in the percentage of the infection between males and females (p = 0.003). Males had higher lamellae length and width than the females (p>0.05). The gills show an observable lesion, diffuse infiltrate, sanguineous congestion dilation of marginal vascular channel and disorganization of secondary gill lamellae. The study indicated that Branchiomyces species showed a high presence in farm-raised African catfish. The gills of infected fishes showed early stage of alterations. The gill histomorphometry, indicated that the lamellae were affected which could lead to respiratory disorder.

Keywords

• Branchiomyces species,Clarias gariepinus,gill,infection

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