Publication Date:
2021-05-19
Description:
Nowadays, white spot virus disease is serious threat for breeding and culture industry of shrimp. In this study
was increasing resistance of shrimp against white spot virus by using modern methods such as shrimp
vaccination with inactivated viruses and recombinant proteins. The aim of this study were determine the growth
and survival rates vaccinated and non-vaccinated of Litopenaeus vannamei (5 to 15 and 12 to 26 day), that were
challenged with white spot virus in 40 and 60 day rearing. This study consisted two separate groups were
vaccinated and non-vaccinated with 11 treatments experimental and each of replicate was stocked 1000 pieces
by post larva of 5 to15 and 12 to 26 day. After vaccination, two groups of post larvae exposed to the white spot
virus at 40 and 60 day, one groups no exposure to the virus. Samplings were randomly of shrimp in 40, 60 and
80 days 10 pieces each of treatment experimental and measured mean of weight and length. Also, number of
deaths was recorded at morning and evening daily and calculated survival rate at the end of study. The results
showed growth rate of post larvae vaccinated (5 to15 day) which exposed to white spot virus at 40 and 60 was
significantly lower than non-vaccinated of post larval, while the growth rate of post larval exposed to virus in 60
day was significantly increased. On the other hand, growth rate of post larval vaccination (12 to 26 day) exposed
to virus in 60 day compared with post larval vaccination (5 to 15 and 12 to 26) exposed to virus in 40 and 60
days was significantly increased. Hence, growth rate was significantly increased in post larval vaccinated (5 to
15 and 12 to 26) which non-exposed to virus. Although the survival rate was post larval vaccinated (12 to 26
days) exposed to virus Post larvae in 60 day higher than post larval were exposed to virus in 40 and 60, but no
significant differences were observed. However, relative mortality of post larval vaccination in 12 to 26 day
compared with post larval vaccination in 5 to 15 days exposed to virus were significantly lower. Considering
growth and survival index was improved of post larval vaccination can be concluded that the optimum age for
vaccination against white spot virus of L.vannamei was 12 to 26 day.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
White spot virus
;
Litopenaeus vannamei
;
Vaccination
;
Growth
;
Survival rate
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
45pp.
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