Lakes poisoned to halt topmouth gudgeon invasion

Several lakes in Hampshire are being poisoned in a bid to control topmouth gudgeon (Pseudorasbora parva), an invasive non-native fish first introduced to Britain in the 1980s which has become more widespread in recent years.

Topmouth gudgeon (Pseudorasbora parva)

Topmouth gudgeon (Pseudorasbora parva)
(Photo credit: Melania, Wikimedia Commons)

The fish, native to Asia, has spread across much of Europe in recent decades, travelling along waterways and facilitated by illegal fish stocking. Its impacts are significant and include predation on native and farmed fish eggs, resource competition and the ability to host and transmit the rosette agent (Sphaerothecum destruens), a fish parasite that is particularly devastating to Salmonid species such as trout and salmon

The piscicide, Rotenone, is to be applied to the lakes following the removal of native fish in an effort to eradicate topmouth gudgeon whilst limiting non-target impacts. The method has been used by the Environment Agency at a number of sites over the last decade as part of a wider strategy to eradicate topmouth gudgeon from England and Wales. Rotenone breaks down over several weeks, after which the site can be re-stocked with native and/or farmed fish species. Whilst the intervention is fairly drastic, it is considered necessary to prevent the further spread of topmouth gudgeon and limit its likely environmental and economic impacts.

Find out more about the topmouth gudgeon and hundreds of other invasive species at CABI’s open access Invasive Species Compendium.


Dr Paul Fisher
Communications Manager, CABI

About these ads

About cabiinvasives
Blog admin

2 Responses to Lakes poisoned to halt topmouth gudgeon invasion

  1. Terrible, but necessary I guess.

  2. corinprattcabi says:

    Topmouth gudgeon successfully eradicated from a brook in north London by EA using rotenone – first time attempted in flowing water in UK. Brook may now require re-stocking with natives which were also eradicated in the process. http://www.bbc.co.uk/news/uk-england-london-25399604

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 202 other followers

%d bloggers like this: