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The Environment Agency in England and Wales now requires all farmed brown trout stocked into rivers and some lakes to be infertile (triploid). These regulations were put in place in January 2015. Details are on the EA website archive - click here.
The Scottish Government has a simlar policy - details are here.
The Wild Trout Trust is often asked for advice relating to the introduction of farmed trout (stocking) to rivers. Please do contact us for informed advice and comment; we often hear the same reasons given by different people for wanting to continue to stock rivers with fertile farmed brown trout. Click here to download a PDF of common questions and answers.
We have produced a position statement with a list of references, and also a concise summary document to help people make an informed decision about stocking and the protection of wild brown trout. The document was prepared by Dr Paul Gaskell with assistance from other WTT staff and our volunteer Advisory Panel, and published in May 2012.
In this short video, Paul Gaskell outlines some of the risks & dangers associated with stocking rivers with fertile fish
'Improved Trout Stock management' includes suggestions about how to improve your wild trout fishing opportunities:
A number of angling clubs the Wild Trout Trust have worked with have taken the decision to cease stocking or reduce the numbers of fish introduced to their rivers. We asked them to provide case studies of their experiences describing how and why they took the decision and what the results have been. Click on the links below to read each case study (pdf documents). More will be added shortly.
River Leven, North Yorkshire - Hutton Rudby Fly Fishing Club. 2014 season update here and 2015 season update here. Also, a great description of member, Scott Hansford's first day of the season here
River Ribble, Lancashire. Three 5 minute YouTube videos of a presentation by Neil Handy at the 2015 WTT Annual Get Together covering the experience of reducing stocking on the River Ribble.
See also this excellent video from Montana: Stopping stocking - the experience 40 years on
The full length document 'Wild Trout Trust - View on Stocking and Rationale' contains an extensive list of scientific references. Many of these are available if searched for using an internet search engine or British Library Direct .
The following articles on the subject of stocking, were written by Dr Paul Gaskell for Trout and Salmon magazine:
- Let Them Get On With It (4 Mb) - Wild broodstock and fry stocking: all its cracked up to be?
- No Sex Please - We're Triploids (3 Mb) - the benefits of infertile stock fish
- To Stock or Not to Stock (4 Mb) - the pros and cons of introducing fish
Below are several articles relating to stocking, previously published in the WTT magazine Salmo trutta:
- Native broodstock: ‘Trout stocking – where do we go from here?’ Andy Thomas. Click here to download.
- Science roundup: Trout genetics. Click here to download.
- Science roundup: Origins of brown trout diversity. Click here to download.
- Article by John Aston with his thoughtful views on 'the great stocking question'
- Environment Agency (England & Wales) National Trout and Grayling Fisheries Strategy, 2003. PDF
- Environment Agency (England & Wales) Trout Stocking Policy leaflet, 2009. PDF
- Professor Andy Ferguson's report for the EA, 'Genetic impacts of stocking on indigenous brown trout populations',
- 2006 PDF
- Scottish Natural Heritage Commissioned report no.513; Guidelines for stocking of fish within designated heritage sites PDF
- Salmon & sea trout: To stock or not? A publication produced for the Scottish Executive by FIsheries Research Services PDF
- Wild Broodstock Schemes: A Good idea? PDF