I feel their disease prevention is not up to standard there is...

I feel their disease prevention is not up to standard there is another operation looking to be put in place upstream couple that with this post was by me from a couple of years ago and in reply to you at the time amused observer

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would not bio asset security be less of a risk as water rotation will be less than their current facilities ?

Give it to you though birds could be a problem , crocs snakes could be an issue but thinking could be controlled by seaving the ponds plus decent electric fencing
Personally think they should start with 4 times as many ponds but smaller in size to use bot for experimental purpose and for better disease isolation if occurred
Flooding should be controllable with stop banks .
Interesting project if they had total 10,000 Ha in prodn at 10 tons a Ha that is 100,000 tonnes * A$13,000 a tonne = $1.3B a year in Revenue on Capex of $1.3B
At an OPEX of $6000 a tonne around $700M per annum of cash flow before C3 costs