150 The UMAP Journal 30.2(2009) By determining the quantities of species required to reach the desired water quality of0.5-1.0×10° bacteria/ ml and0251/ 1 of chlorophyl让 is possible to increase the overall yield of fish available for harvest while recreating a polyculture thatis sustainable. Through modeling this process, we determine how to recreate the stable ecosystem present before commer- cial milkfish farming. This process will also reduce the cost of overall feed we determine what combinations of populations of the species could be self-sustaining. Still, this practice requires guidelines for harvesting only a portion of any species, so as to prevent recreating the overfishing problem that was the cause for the rise of commercial fish-farming, which created the issues with water quality and coral reef destruction in the firs e condi- Re-establishing the balance that occurred in the region under the tions present in the model from Task 1 is difficult. It requires introducing other species into the commercial fish pens that help to keep the other pop ulations under control. However, our model demonstrates the pattern of what would occur to waste levels over time if such a combination is at- tempted. This process was possible by taking data from Internet sources to determine sustainability rates for each of the species and then adjusting the populations of each species to achieve the desired water quality levels The results of this model rely heavily on increasing the population of blue mussel to control the waste levels of bacteria from the growing milkfish population. The downward trend in the level of bacteria present in the water is depicted in Figure 4. In a few years, the population ofblue mussels almostentirely eliminates the bacteria waste. Similarly rabbitfish reduce the level of chlorophyl through consumption of gae, a process that provides more sunlight and nutrients for coral to grow again [Capuli and Kesner-Reyes 2008]. The milkfish keep the rabbitfish under control, and tiger prawns provide the milkfish an alternative food source so that the milkfish don't wipe out the rabbitfish population. Moreover, starfish consume the mussels to keep them from growing uncontrollably The reproductive rate of starfish can vary widely. If an overpopulation of starfish occurs before blue mussels can grow sufficiently, the waste lev- els of bacteria can grow upward exponentially because the blue mussel is not yet able to sustain its own survivability. Thus, the process requires a reduced presence of starfish early in the biodiversity effort and a greater number of blue mussels. After about six to eight months, the mussels have grownenough thatmore starfishcangraduallybeintroduced Ifthestarfish reproduce too quickly early, it may be necessary to add more blue mussels periodically, because there is no effective control on the starfish population Ir model requires introduction of certain quantities of starfish, rab bitfish, blue mussels, and giant tiger prawn to re-establish a sustainable polyculture that would support the milkfish while improving water qual150 The UMAP journal 30.2 (2009) By determining the quantities of species required to reach the desired water quality of 0.5-1.0 X10 6 bacteria/mI and 0.25 ILg/1 of chlorophyll, it is possible to increase the overall yield of fish available for harvest while recreating a polyculture that is sustainable. Through modeling this process, we determine how to recreate the stable ecosystem present before commer￾cial milkfish farming. This process will also reduce the cost of overall feed for the milkfish, since they can eat some of the other species. By fixing the goals of acceptable water quality as the output of this model, we determine what combinations of populations of the species could be self-sustaining. Still, this practice requires guidelines for harvesting only a portion of any species, so as to prevent recreating the overfishing problem that was the cause for the rise of commercial fish-farming, which created the issues with water quality and coral reef destruction in the first place. Re-establishing the balance that occurred in the region under the condi￾tions present in the model from Task 1 is difficult. It requires introducing other species into the commercial fish pens that help to keep the other pop￾ulations under control. However, our model demonstrates the pattern of what would occur to waste levels over time if such a combination is at￾tempted. This process was possible by taking data from Internet sources to determine sustainability rates for each of the species and then adjusting the populations of each species to achieve the desired water quality levels. The results of this model rely heavily on increasing the population of blue mussel to control the waste levels of bacteria from the growing milkfish population. The downward trend in the level of bacteria present in the water is depicted in Figure 4. In a few years, the population of blue mussels almost entirely eliminates the bacteria waste. Similarly, rabbitfish reduce the level of chlorophyll through consumption of algae, a process that provides more sunlight and nutrients for coral to grow again [Capuli and Kesner-Reyes 20081. The milkfish keep the rabbitfish under control, and tiger prawns provide the milkfish an alternative food source so that the milkfish don't wipe out the rabbitfish population. Moreover, starfish consume the mussels to keep them from growing uncontrollably. The reproductive rate of starfish can vary widely. If an overpopulation of starfish occurs before blue mussels can grow sufficiently, the waste lev￾els of bacteria can grow upward exponentially because the blue mussel is not yet able to sustain its own survivability. Thus, the process requires a reduced presence of starfish early in the biodiversity effort and a greater number of blue mussels. After about six to eight months, the mussels have grown enough thatmore starfish can graduallybe introduced. If the starfish reproduce too quicldy early, it maybe necessary to add more blue mussels periodically, because there is no effective control on the starfish population. Our model requires introduction of certain quantities of starfish, rab￾bitfish, blue mussels, and giant tiger prawn to re-establish a sustainable polyculture that would support the millfish while improving water qual-