The diagram shows an intensive land-based freshwater tilapia pond.
Suggest three distinct ways in which the physical barriers (both the overhead net and the perimeter wire fence) protect the farmed tilapia.
Accumulation of uneaten food pellets and fish faeces on the bottom of the pond can lead to a reduction in the dissolved oxygen level in the water. Explain how this process occurs and how it could affect the growth of the tilapia.
Explain why it is important for the fish farmer to quickly remove any dead tilapia from the pond.
State the biological control shown in the diagram and explain how it helps the tilapia.
