Situation. The tilapia industry in Ecuador developed out of an urgent need to find a solution to the White Spot Syndrome Virus (WSSV) that had devastated its shrimp farming industry. Prior to our involvement, our client was practicing polyculture of tilapia and shrimp, stocking 115-150 gram tilapia with Litopenaeus vannamei at 0.2 and 11 per meter square respectively during final