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March 15, 2014

Australia

 “Microbial Biomass” Feeds for Tiger Shrimp

 

This study examines the influence of declining levels of fishmeal and oil on the growth of shrimp and the benefit of microbial biomass [biofloc?] to offset effects from replacing fishmeal and oil.  Microbial biomass offset any performance losses due to the replacement of fishmeal and/or fish oil.  Benefits of the microbial biomass were seen in both laboratory and outdoor green-water systems.

 

From Abstract: A series of experiments were conducted with black tiger shrimp (Penaeus monodon) juveniles to determine the effects of reducing fishmeal in their diets and then to evaluate the potential for a microbial bioactive [biofloc?] to support complete replacement of both fishmeal and fish oil in feeds when fed under clear-water and green-water conditions.  The reduction of fishmeal resulted in a consistent decline in growth, indicating that at every decrease in fishmeal below an inclusion level of 45% there was a decline in performance.  In a subsequent trial undertaken in a clear-water tank system diets devoid of both fishmeal and fish oil fed to shrimp were demonstrated to produce poorer performance than a fishmeal and fish oil reference diet. The addition of a microbial bioactive, however, to the diet resulted in not only a compensation for the replacement of these ingredients but additional growth.  Replication of the clear-water trial in a green-water tank system produced similar results, but also showed that the green-water system largely compensated for the performance lost through replacement of fishmeal and fish oil.  It was also shown, however, that the use of the microbial bioactive in the diets still resulted in improved growth performance of shrimp.

 

This study has effectively demonstrated a viable strategy for the complete replacement of all fishery products in shrimp diets.

 

Source: Aquaculture.  Effective Use of Microbial Biomass Products to Facilitate the Complete Replacement of Fishery Resources in Diets for the Black Tiger Shrimp, Penaeus monodon.  Brett Glencross (email brett.glencross@csiro.au, phone 61-7-3826-7236, CSIRO Food Futures Flagship, 41 Boggo Road, Dutton Park, Queensland 4102, Australia), Simon Irvin, Stuart Arnold, David Blyth, Nicholas Bourne and Nigel Preston).  In Press, Accepted Manuscript.  Available online on March 11, 2014.

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