Abstract
A conventional bioeconomic model is used for a cost-benefit analysis of introducing the non-native signal crayfish, which has an eradicating impact on the stock of the native noble crayfish. The values of the noble and signal crayfish populations are measured as present values of their net future revenues. The results indicate that the net benefit of an introduction is positive if the intrinsic growth rate or the carrying capacity of the noble crayfish is below 40% that of the signal crayfish. This means that, only if there are significant biological differences between the two species, economic gains can be realized by allowing introduction of the signal crayfish.
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