A modular assessment tool for managing introduced fishes according to risks of species and their populations,and impacts of management actions |
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Authors: | J Robert Britton Gordon H Copp Matt Brazier Gareth D Davies |
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Institution: | (1) Centre for Conservation Ecology and Environmental Science, School of Applied Sciences, Bournemouth University, Poole, Dorset, BH12 5BB, UK;(2) Salmon and Freshwater Team, Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, NR33 0HT, UK;(3) North Area North West Region, Environment Agency, Penrith, Cumbria, UK;(4) Fisheries Technical Services, Environment Agency, Bromholme Lane, Brampton, Huntingdon, Cambridgeshire, PE28 4NE, UK |
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Abstract: | A modular assessment scheme for assisting the risk management of introduced fishes is described, with its recent application
to England and Wales demonstrated. The initial module prioritises the introduced fishes in the risk assessment area according
to their potential invasiveness and current distribution. The second module then assesses populations of the prioritised species
in relation to the character of their receiving waters and the potential risks posed by their population in that circumstance;
the output is a suggested management action for each population. The third module evaluates the suggested management action
in relation to its potential impacts in the environment and how these impacts may be mitigated. The final module assesses
the estimated cumulative cost of the selected management action relative to an alternative action. To demonstrate its potential
value for managing extant populations of introduced fish, three eradication case-studies from England were assessed retrospectively
using the scheme. This revealed eradication of two topmouth gudgeon Pseudorasbora parva populations was commensurate with their levels of ecological risk in the environment. By contrast, initial assessment of
the eradication of a feral population of fathead minnow Pimephales promelas suggested control and containment was the commensurate management action due to a relatively low risk of natural dispersal.
Application of the scheme elsewhere in the world and to other faunal groups should enable more objective decision-making in
management programmes and enhance conservation outcomes. |
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