Figure 1 shows a salmon fish farm in the sea.
Figure 1
(i)
Explain the benefit to the fish farmer of the wrasse being able to enter the net to where the salmon are being kept.
(3)
(ii)
In Scottish fish farming, huge quantities of wrasse have been caught from their natural environment and relocated to the salmon farms as a biological control.
Marine conservation experts have suggested that overuse of non-indigenous species in fish farming practises may have a negative impact on biodiversity.
Discuss the negative effects that wrasse relocation may have on biodiversity
(4)