Blue Tilapia or Oreochromis Aureus. Fish will be approximately 1.5” in length. They will be a mix of males and females. Blue Tilapia have a cold hardiness of 47 degrees . Their max life expectancy is ten years . Some reach 18 inches and 9 pounds in weight .These are our best selling species. They are an excellant source of protein. Tilapia also serve as a natural biological control for most aquatic plant problems.