Other Traits. Delayed maturation in Nile tilapia production stocks could be viewed as advantageous by some tilapia farmers, because it would give them the option to grow both male and female fish, not just all male SRT (footnote 9), to larger sizes at harvest before they matured and spawned. Conversely, tilapia seed producers would not normally welcome delayed maturation because it would take longer for their broodstock to start spawning. Later maturation might, however, be acceptable to some seed producers if the result were female fish that produced larger and more viable eggs and fry that could be sold at higher prices—although a fish producing larger eggs would normally produce fewer eggs. Given these considerations, age and size at maturation are difficult traits in tilapia breeding. They are influenced by multiple genetic and environmental factors and by interactions among these factors.