Pathogenicity of Achlya proliferoides and Saprolegnia diclina (Saprolegniaceae) Associated with Saprolegniosis Outbreaks in Cultured Nile Tilapia (Oreochromis niloticus)
نویسندگان
چکیده
A study was conducted to evaluate the pathogenicity and pathology of Achlya proliferoides BSN-M005 and Saprolegnia diclina BSN-M003, isolated from saprolegniosis outbreaks against immature stages of Nile tilapia, Oreochromis niloticus. The cumulative mortality rates of the tested fish groups that exposed to high zoospore concentrations of A. proliferoides BSN-M005 and S. diclina BSN-M003 were 60 and 100% respectively. The histopathological changes associated with saprolegniosis lesions induced by S. diclina BSN-M003, were loss of the epidermis, edema of the hypodermis, different degrees of degenerative changes in the underling musculature and the fungal elements were observed penetrating the entire musculature. On the other hand, the histopathological changes associated with saprolegniosis lesions induced by A. proliferoides BSN-M005 showed mats of hyphae attached the surface of epidermis, necrosis, degenerative changes close to hyphae and sometimes fungal elements were observed penetrate into dermal layer but never reach the underling musculature. It is clear from our results that S. diclina BSN-M003 is highly pathogenic than A. proliferoides BSN-M005 to Nile tilapia.
منابع مشابه
Protective role of adjuvant and potassium permanganate on oxidative stress response of Nile tilapia (Oreochromis niloticus) challenged with Saprolegnia ferax
Saprolegniosis are one of the most important oomycetes affecting freshwater fish worldwide. It leads to huge losses in fish farms due to their massive destruction to the fish epidermis leading to sever heamodilution and death, yet little literature studied the oxidative stress response regarding the saprolegniosis. Nile tilapia fish were subcutaneously abraded and divided into four groups: cont...
متن کاملSkin and subcutaneous mycoses in tilapia (Oreochromis niloticus) caused by Fusarium oxysporum in coinfection with Aeromonas hydrophila
Subcutaneous mycoses in freshwater fish are rare infections usually caused by oomycetes of the genus Saprolegnia and some filamentous fungi. To date, Fusarium infections in farmed fish have only been described in marine fish. Here, we report the presence of Fusarium oxysporum in subcutaneous lesions of Nile tilapia (Oreochromis niloticus). Histopathologic evaluation revealed granuloma formation...
متن کاملComparison and determining the quality and evaluation of corruption of Frozen Fillets Tilapia Nile fish (Oreochromis niloticus) imported and cultured in Iran
One of the problems products produced of imported frozen fillets tilapia fish such as nuggets, bitterness of the products in during storage in freezing conditions. Since in this study, the quality of imported frozen fillets with fillets of tilapia that cultured in Iran, during two months was evaluated and the trend of corruption in the fillets was compared. According to the results of evaluatio...
متن کاملThe effect of black glutinous rice bran (Oryza sativa L.) in diets of Nile tilapia (Oreochromis niloticus)
The effect of black glutinous rice bran inclusion used in diets of Nile tilapia was studied in fish with an initial weight of 8.76±0.17g per fish and fed with experimental diets supplemented with black glutinous rice bran at 0 (control), 50, 100, 150 and 200 g kg-1 for 60 days. The results of phytochemical analyses of black rice bran showed that the total anthocyanin, phenolic, tannin and phyt...
متن کاملProduction of genetically male tilapia through interspecific hybridization between Oreochromis niloticus and O. aureus
This study was conducted to produce a high percentage of genetically male tilapia through interspecific hybridization between Nile tilapia, Oreochromis niloticus and Blue tilapia, O. aureus and evaluate sex ratio, productive performance and heterosis of the progeny produced. The results revealed that sex ratios of the progenies of (♀ O. aureus x ♂ O. niloticus) and (♀ O. niloticus x ♂ O. aureus...
متن کامل