NC State U says red bellied tilapia are used:
 Quote:
Occasionally, the blue tilapia (Tilapia aurea) has been used to control algae, and the redbelly tilapia (Tilapia zillii) has been used to control aquatic macrophytes (coarser vegetation) in North Carolina.


http://www.ces.ncsu.edu/nreos/wild/fisheries/weed_mgt/grasscarp/bio_control.html


Pond Boss Subscriber & Books Owner


If you can read this ... thank a teacher. Since it's in english ... thank our military!
Ric