Wavelength dependant turbidity water culture.
So pre-pilot technology not well enough piloted or was it all hype?
Three comments here:
Addison Lawrence was not a commercial shrimp farmer but a University professor – so while easy to grow shrimp in laboratory small scale with top heavy labour relative to cost output – not necessarily a scale-able technology. Thought his patent was for stacked tanks – perhaps project would work if it were not for…
….Biofloc – dominate and manage a culture to culture the shrimp…hmmm. Tricky – which is why clearwater may be a better RAS method (automated) and more cost effective. Nust managing bioflic one is not managing shrimp culture and by the time one looks at shrimp….woooosh…too late.
All shrimp viruses can be managed with good husbandry and that means feed and water quality.
Having a system in quarantine should mean that one can carry receiving seed and growing the shrimp out in commercial production. If quarantine and contained no risk then is there! So only sufferance will be if poor husbandry and poor shrimp performance. It becomes a commercial problem. Just that biofloc does not work with RAS.
Importance of marketing and appropriate sales must not be underestimated – its not just growing at good production cost but also selling at good enough price.
The press and others tend to equate RAS with ‘biofloc’….or……that to go intensive and indoor, everyone is using ‘biofloc’. Far from it!
‘Biofloc’ may be good in intensive outdoor but clear systems may be the better bet for indoor super-intensive going forward.
It is the predominate method showing shrimp promise in Europe.
Clear water lends itself to a controlled parameters system that relies less on biological management and totally on physical, mechanical or chemical processes. Dependence switches to quality water management (external) and a complete diet fed – this of course is the important part as there is no secondary supporting feed bacteria in system.
Bio-floc, on the other hand is a biological management that requires culturing. A culture to culture shrimp. Just an intensification really of existing culture mimicking estuarine conditions. Good for outdoor, semi outdoor, non climate controlled systems…
Remains to be seen. If salmon production expert why wade into shrimp? Not enough profit growing salmon technology?
Selling technology and equipment is one thing.
Growing and marketing shrimp is a completly different kettle of fish.
In an ideal world bio-security means living in a bubble. That is fine and is the premise of the SPF term.
Current RAS shrimp grow out technologies however rely on exclusion biosecurity measures. Not completely living in a bubble at all.
Even in current RAS water effluents are allowed if abide to regulatory standards in location. Air effluent, as systems are run on positive air pressure (air/oxygen bubbled into water), are not controlled.
So now lets take a look from an external perspective NIMBY viewpoint…..positive pressure means that there seems to be some air escaping….and standards for water to waste means some discharge allowed. Hang on though…not really biosecure at all – maybe for protecting the crop but not for the environment where the facility is placed. Especially if growing exotics.
Containment RAS systems are such that there are no wastes at all. No water and no air. Nothing to the external environment except for the harvested protein……and even then that needs to be bio-securely delivered and cooked prior to eating.
Containment RAS therefore is a barrier to entry and exits technology whereas exclusion RAS technology (the current state of play) is just a barrier to entries.
Is containment RAS a possibility in shrimp growout?
What benefits are there? Better biosecurity for the environment? Diseases become secondary to growth? Other shrimp apart from vannamei become of interest?
A technology to manage risk that was originally developed at Granmar shrimp farm in Ecuador in the early 1980’s to overcome seasonality issues with wild seed and make sure that any problems are caught early on in culture so that remedial action could be taken accordingly and losses minimized is now being implemented in an advanced RAS system in the US.