Analysis of occurrence for three pathogens: WSSV, TSV and IHHNV in cultured vannamei of Abadan (Iran)

Objective: In Iran, fatally occurrence of white spot disease led to introduction a new species, Litopenaeus vannamei. Several viral diseases of cultured Penaeus vannamei, threaten the sustainability of shrimp farming industries worldwide. For example TSV is considered one of the most harmful pathogens in this species, with cumulative mortalities reaching 40 to 95% in Americas. So due to importance of these diseases (TSV, WSSV and IHHNV) it was decided to assess the health situation of vannamei cultured in Abadan, Khouzestan. The main purpose of this paper was to analyse the co-occurrence of these agents in relation to each other. Method & Materials: About 90 samples of L. vannamei were collected from shrimp cultural ponds in Choebdeh, all over of the culture season. Assessment of disease agents including WSSV, TSV and IHHNV was carried out by a commercial kit named ""IQ2000, WIT MultiVir System"", which detects the trial pathogens simultaneously. After that the answers for each sample and each disease was extracted and typed in a spreadsheet and finally used for statistics calculations by Spss (Ver. 16). Results & Conclusion: Considering two pathogens, WSSV and IHNNV, it has been shown that when the shrimp is negative for IHHNV the probability to carrying WSSV is 96% and the co-occurrence for them is too low, about 15%. For TSV and WSSV the results have shown that for a sample carrying TSV, the probability to have WSSV is 94% and the probability to be present at the same time for them is about 73%. About TSV and IHHNV the probability for co-occurrence of them is 14% and when a specimen is positive for TSV the probability to have IHHNV is 75%. Results of comparison mean for occurrence of three pathogens by T-test showed that there was a significant difference between WSSV and IHHNV (Sig. < 0.05).

کلیدواژه ها:

vannamei ، WSSV ، TSV ، IHHNV ، Abadan