increases in plant yield required to maintain total revenue (ATR 0) are 37.5, 28.1, 18.7 and 9.4 respectively. Finally, we apply fish and plant yield data from our experimental results to the UVI model. Given a 37.4 reduction in fish yield and a 51.9 increase in plant yield (based on means of normalized net fish growth observations and normalized leaf biomass. observations during the experimental trial, the UVI model would see a $6379 decrease in revenue from tilapia sales per unit and an S18,892 increase in revenue from lettuce sales per unit. Therefore, total revenue would increase by 234 or $12,513 per unit, by adopting the alternative feed. We also consider more conservative estimates of changes in yields: 45.3 reduction in fish yield and 39.3 increase in plant yield. We arrive at these figures by calculating means after removing the leaf yield data from replicates 5 and 6 and removing the lowest net fish growth observation in the control group. Combinations of each of these percentage-change values and their effects on total revenue are presented in Fig. 5. Under the most conservative projection (Ari -45.3%; AY 39.3 based