Posts Tagged ‘trout’
Water releases from the Avon dam have been negotiated by the Devon Avon Group during dry spells of weather in order to facilitate, for example, the migration of salmon smolt. Full details are available in Notes from the DAG meetings, elsewhere on this website.
Currently (10th May) the river water level at the Loddiswell gauging station is 0.28m – at the low end of the normal range of 0.25m-1.80m. Therefore, the Environment Agency has triggered, with the close collaboration of SWW, the release of an extra 65ML per day of water from the dam between 3.00pm on Friday 6th May and Monday 9th May. Most of the benefit will be in the upper reaches of the river, which for many years have run very low during dry weather.
This report by Scott West, the SHRImP project manager from The Westcountry Rivers Trust (WRT) describes a semi-quantitative fry index electrofishing survey throughout the Rivers Avon, Yealm & Erme in July and August 2014. This was the second year of fish monitoring of this type and goes someway to establishing a longer term data set for the South Hams Rivers.
The surveys were targeted to complement the Environment Agency (EA) electric fishing monitoring undertaken in 2014, although both data sets use different methodologies with the primary difference being the use of fully quantitative depletion methods used by the EA and a semi-quantitative fry index method used by WRT (to be detailed in Field sampling and data analysis methods section). A total of two sites on the Avon, two sites on the Erme and 16 sites on the Yealm were surveyed by the Environment Agency in the 2014 season (see appendix D).
The full text of the report may be found in the RESEARCH REPORTS section of the RESEARCH page.