I read somewhere (on the internet so it must be true) that even with predator fences you still have to create and maintain buffer zone with traps/poison etc. If you have to do that, why bother with the expense of the fence in the first place? Make the island a bit bigger and increase the concentration of control measures in the buffer zone.
And another thing!
If a biological control is found, how long before F&B and the eco fundamentalists decide to develop a similar control for our game species? If you think they will stop at the little pesties you're dreaming.
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