مطالعه سندرم تلفات بچه ماهيان قزل آلاي رنگين كمان در استان هاي تهران و لرستان

Study of fry trout mortality syndrome in some farmed rainbow trout in Tehran and Lorestan provinces

Clinical, microbiological and histopathological studies were undertaken to study any possible aetiological agents of fry trout mortality syndrome in some farmed rainbow trout of Tehran and Lorestan provinces during 1998 and 1999. Anorexia, lethargy, darkening of body, swimming in the surface of water, exophthalmia, fin - rot, abdominal distension and hyperemia of internal organs were some of clinical findings. Histopathologically, the affected fish showed hyperemia, hyperplasia and necrosis of gill lamellae, hyperemia/ haemorrhage in liver sinusoides as well as a notable accumulation of haemosidrins in the liver and kidney tissues were observed. The results of microbiological studies consisting of bacteriology and parasitology were negative except for a few samples at which were positive for some filamentous, rod and gram negative bacteria observed in the liver and gills.