Identification of Tilapia Lake Virus in Egypt in Nile tilapia affected by ‘summer mortality’ syndrome

Abstract

M (2017) Identification of Tilapia Lake Virus in Egypt in Nile tilapia affected by 'summer mortality' syndrome, Aquaculture, 473, pp. 430-432.

Emergence of tilapia lake virus in Thailand and an alternative semi-nested RT-PCR for detection

“…Up-to-date, TiLV has been publicly reported in Israel, Ecuador, Colombia, and Egypt (Eyngor et al, 2014;Ferguson et al, 2014;Tsofack et al, 2016;Fathi et al, 2017). This study has confirmed the presence of TiLV associated with high mortalities (20-90%) in tilapia farms in Thailand, one of the major tilapia producers in Asia.…”

“…Niloticus in Egyptian farms (Fathi et al, 2017). This study also found natural infections of TiLV in fingerlings of red and Nile tilapia reared in both earthen pond and open cage system in three different provinces in Thailand.…”

“…Recently, a novel RNA virus, called tilapia lake virus (TiLV), has been discovered as the causative virus of high cumulative mortalities (80-90%) in farmed tilapia in Israel, Ecuador, and Colombia Del-Pozo et al, 2017;Eyngor et al, 2014;Ferguson et al, 2014;Tsofack et al, 2016) and 5-15% morality in Egypt (Fathi et al, 2017). Initially, Ferguson et al (2014) described a novel disease with suspected viral etiology, namely syncytial hepatitis of tilapia (SHT) in fingerings of Nile tilapia (Oreochromis niloticus) in Ecuador.…”

Production‐level risk factors for syncytial hepatitis in farmed tilapia (Oreochromis niloticus L)

“…Both multivariate models show that excess mortality of tilapia due to the SHT increased when stocking density was increased. A previous study reported that stocking density of tilapia contributed to the presence of TiLV (Fathi et al., ). It has been reported that stocking density is inversely proportional to the total body weight, daily weight gain and length of Nile tilapia fingerlings which impacts on the immunity of the fish (Breine, Nguenga, Teugels, & Ollevier, ; Sanudi, Jere, Mzengereza, & Chirwa, ).…”

“…Several outbreaks of TiLV with mortalities reaching 90% have been reported in Thailand (Dong et al., ). In Egypt, the disease has been reported to cause summer mortalities (5%–15%) in numerous farms (Fathi et al., ). The identity of the associated virus in all of these distinct pathological presentations was shown to be an RNA virus (Eyngor et al., ; Tsofack et al., )‐related genetically (Bacharach et al., ) and morphologically to the Orthomyxoviridae family (del‐Pozo et al., ).…”