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Food production

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Question 62

The diagram shows a land-based freshwater trout farming pond.

A diagram of an inland freshwater trout farming pond with an overhead net, mesh screens at the water inlet and outlet, accumulated organic waste at the bottom, a dead trout with fungal infection, and a zoomed-in detail of cleaner shrimp eating ectoparasites off a living trout.

a.

Suggest three distinct ways in which the protective barriers (the overhead net and inlet/outlet mesh screens) protect the farmed trout.

[3]
b.

Accumulation of waste food and 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 trout.

[3]
c.

Explain why it is important for the fish farmer to quickly remove any dead fish from the pond.

[1]
d.

State the biological control shown in the diagram and explain how it helps the trout.

[2]

Food production Questions

  1. IGCSE
  2. /Biology
  3. /Food production