The higher the density the higher the risks the higher the need to get all other lessons previously mentioned correct…
Nursery ponds – yes use screening and population controls in steps along culture.
A technology initially developed and used in South America because there were no hatcheries and purchasing wild seed was seasonal.
Granmar farm was a pioneer also to trial shrimp seed from its sister company, Semacua – the first commercial shrimp hatchery in the world
Using nurseries removed the seasonality of farmed shrimp culture pre hatchery seed and allowed for test bed for performance of pioneering hatchery produced….
Surveillance and testing suggestions good for contact tracing but not a solution to any virus.
Also fear mongering is unhelpful and counter productive.
Perhaps an underlying agenda here needs some good quality investigative reporting?