Originally Posted By: jpsdad


In the case of TFS, it is known that they reduce BG biomass but the productivity of the system is improved for LMB.


The studies are very inconsistent on this issue with studies going different directions. Some find increased BG biomass due to less predation on early age BG. So while the BG numbers are about the same the size of the BG are larger. BG and TFS only compete for food on a minimal basis - not direct competition overall. In some instances the overall bio mass increased - a shift in the chart to a higher productivity level.

My 2 cents is tilapia work the same way in some cases. It just depends.