Aquaculture 2022

February 28 - March 4, 2022

San Diego, California

MITIGATION OF THE ACCUMULATION OF OFF-FLAVOURS AND OTHER UNDESIRABLE CHEMICAL COMPOUNDS IN MARINE FINFISH Seriola lalandi AND Argyrosomus japonicus PRODUCED IN AN INTENSIVE RECIRCULATING AQUACULTURE SYSTEM THROUGH THE USE OF A NOVEL FEED (AMT) AND FEEDING STRATEGY

Andre Bok*

Lawrence Grant

 

Aqua Management Technologies

East London, South Africa

andre@a-m-t.co.za

 



Aqua Management Technologies (AMT) manufactures high-quality feed with highly digestible ingredients specifically designed for use in intensive recirculating aquaculture systems (RAS). AMT feeds come with a recommended rationing programme that avoids feeding to satiation, rather rationing according to species, size, number, water temperature and oxygen content. While this approach maximises food conversion ratios, it also improves water quality in the RAS system significantly.

When AMT feeds are used in combination with Ozone as part of the RAS production system, the accumulation of any chemical residues (heavy metals, pesticides, antibiotics radio-nucleotides, hormones, PAH’s etc.) and off-flavours (Geosmin and Methyl-Isoborneol /

MIB). Apart from Arsenic (the natural, organic derivative?) being detected, all the other compounds show as ‘below detectable limits’ in the analysis of flesh samples taken on a routine basis at commercial farming enterprise. (a comprehensive list of the compounds and their measurements will be presented).

As a result of the above, the farm does not use any sort of purging technology or process as part of its production and harvesting technology. Fish are simply starved the day before harvest so that the gut is empty for hygienic processing. They are removed directly from the production tanks, slaughtered, bled and placed into an ice slurry, to be sold fresh ‘never frozen’ into the high-end retail and food services industry in South Africa.

Market uptake and acceptance has been flawless.