Gill histopathology in cultured sea bass (Dicentrarchus labrax (L.) coinfected by Diplectanum aequans (Wagener, 1857) and Lernanthropus kroyeri (van Beneden, 1851)

Abstract

Summary: Because of a 1.5% daily mortality was recorded in sea bass (Dicentrarchus labrax) reared in floating-cage farm in Aegean Sea coast of Turkey, 15 sea bass were examined parasitologically and pathologically, in March 2010. Diplectanum aequans (Wagener, 1857) and Lernanthropus kroyeri (van Beneden, 1851) were detected in all fish. Of the 15 sea bass dissected, 100% were infected by Diplectanum aequans (Wagener, 1857), and mean intensity of infection was 31.9, 100% were infected by Lernanthropus kroyeri (van Beneden, 1851) and mean intensity of infection was 11.4, respectively. In the pathological examination of the gills, anemia, whitish mucuoid exudate and greenish egg sac belong to female Lernanthropus were observed. Histologic examinations indicated, both Diplectanum aequans and Lernanthropus kroyeri were present on branchial lamellae in the gills of all fishes. Lamellary edema formation, fusion of the secondary lamellae and necrosis in both primary and secondary lamellae due to parasitic irritation were determined. As a result, it was concluded that fish deaths were occurred due to the lesions formed after dense infestations of Diplectanum aequans and Lernanthropus kroyeri.

Parasitological assessment in the hybrid surubim (Pseudoplatystoma reticulatum x P. corruscans), with uncommon occurrence of Monogenea parasites

“…Proliferative changes in the gill epithelium are among the main disorders observed during the infestation by monogenean (MANSELL et al, 2005;DEL RIO-ZARAGOZA et al, 2010;JERÔNIMO et al, 2014) and can progress to degeneration and necrosis of respiratory tissue, especially in mixed infections with other parasites (YARDIMCI & PEKMEZCI, 2012). The severity of injuries caused by dactylogyrids are directly related to the parasite intensity (DEL RIO-ZARAGOZA et al, 2010).…”