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Fisheries Monitoring of the Ribble Catchment 2017 Ribble Rivers Trust

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Fisheries Monitoring of the Ribble Catchment 2017 Ribble Rivers Trust Fisheries Monitoring of the Ribble Catchment 2017 Ribble Rivers Trust Adam Wheeler: Fisheries Monitoring Officer Fisheries Monitoring of the Ribble Catchment 2017 Ribble Rivers Trust c/o Hanson Cement Ribblesdale Works Clitheroe BB7 4QF Phone: 01200 444452 E-mail: [email protected] Report title: Fisheries Monitoring of The Ribble Catchment 2017 Report reference: RRT_Electrofishing_2017_Report Report version: 1.0 Date: 01/11/2017 Prepared for: The Ribble Rivers Trust Authored by: Adam Wheeler: Fisheries Monitoring Officer Checked by: Mike Forty: Catchment Science Co-Ordinator Copyright Ribble Rivers Trust, 2017. This report has been prepared using due skill, care and diligence for the exclusive use of the commissioning party by Ribble Rivers Trust. No liability is accepted by Ribble Rivers Trust for the use and or application of the contents of the report. i | P a g e Fisheries Monitoring of the Ribble Catchment 2017 Table of Contents Acknowledgements ................................................................................................................................................ ii Executive Summary ............................................................................................................................................... iii Introduction ........................................................................................................................................................... 1 Methodology.......................................................................................................................................................... 3 Electrofishing surveys ......................................................................................................................................... 3 Sub-catchment map ........................................................................................................................................... 5 Data Analysis ...................................................................................................................................................... 6 Results ................................................................................................................................................................... 7 Brown trout ....................................................................................................................................................... 7 Calder .......................................................................................................................................................... 10 Hodder ......................................................................................................................................................... 10 Lower Ribble ................................................................................................................................................ 11 Main Ribble .................................................................................................................................................. 11 Salmon ............................................................................................................................................................. 13 Calder .......................................................................................................................................................... 16 Hodder ......................................................................................................................................................... 17 Lower Ribble ................................................................................................................................................ 17 Main Ribble .................................................................................................................................................. 17 Biodiversity ...................................................................................................................................................... 18 Other Species ................................................................................................................................................... 19 Bycatch ........................................................................................................................................................ 19 Annex II Species............................................................................................................................................ 21 Eel ................................................................................................................................................................ 22 Crayfish ........................................................................................................................................................ 25 Discussion and Conclusions .................................................................................................................................. 26 Recommendations ............................................................................................................................................... 28 References ........................................................................................................................................................... 29 Appendices .......................................................................................................................................................... 30 Appendix A ....................................................................................................................................................... 30 Appendix B ....................................................................................................................................................... 30 Appendix C ....................................................................................................................................................... 33 Appendix D....................................................................................................................................................... 34 i | P a g e Fisheries Monitoring of the Ribble Catchment 2017 Acknowledgements Thanks are offered to the following researchers, staff, and volunteers whose help and continued enthusiasm has proved invaluable during the annual survey programme: Mike Forty (RRT), Paul Peters (RRT), Ellie Brown (RRT), Caroline Taylor (Seasonal Survey Assistant), Victoria O’Brien (Seasonal Survey Assistant), Abigail Powel (Liverpool University), Jacob Marsden (Bowland High), Harvey Manley (Ribblesdale High School), Jason Cummings (Woodlands and Wetlands Trust, AUS), Kat Rowland (Durham University), Bill Auty, Simon Hardacre, Charles Allen Kenyon, Finn Mannion, Jane Wheeler (Fish Friday Volunteers). ii | P a g e Fisheries Monitoring of the Ribble Catchment 2017 Executive Summary The River Ribble Trust concluded its tenth year of its inter-annual fisheries assessment of the Calder, Hodder and main Ribble Catchments. In addition, sites on the River Darwen have been included in 2017’s fisheries programme to monitor capital works for Ribble Life Together. Results of these surveys are used to support the identification for future work as well as monitoring the long-term impacts of habitat and migration restoration schemes. Quantitative and semi-quantitative surveys are performed to assess catchment productivity using an adapted Crozier and Kennedy (1994) electrofishing method. A total of 326 sites were surveyed in 2017 covering 37km² of river. As juvenile fish densities change rapidly with age: surveys are conducted at a similar time each year (June – October) and in the same area to allow for valid comparisons. Salmonids are a keystone species within a river system, they rely on ecological stability and are indicators of water and habitat quality. The Ribble Trust uses the National Fisheries Classification System (NFCS) to allows for the standardisation of results by grading sites based on the densities of these fry. Delays were suffered during 2017’s fisheries programme as higher than average rainfall (September-October) resulted in sites above Gisburn being surveyed later than usual. Surveys commenced on the 19th of Jun and ended on the 16th of October. Brown trout (Salmo trutta) populations have remained relatively consistent over the past eight years (Figure 1). During this time, the biggest impact to recruitment was observed in 2016 after high flow events of the previous winter caused major spawning disruption and reduced survival of ova. Results of 2017 show better survival rates and after last year’s depression with the Calder catchment seeing a 63% increase in grade scores. The Hodder has seen a positive increase in grade score with 36% of its sites improving in comparison to last year’s results. And the main Ribble remains consistent for 2017. This year a total of 3421 individuals were caught from 250 of the 326 sites surveyed. 700 600 500 400 300 Cumulative Grade Score Grade Cumulative 200 100 2010 2011 2012 2013 2014 2015 2016 2017 Trout Salmon Figure 1. Total grade score for the catchments 153 electrofishing sites with 8 years of consecutive data. salmon and trout from 2008 to 2017. iii | P a g e Fisheries Monitoring of the Ribble Catchment 2017 Atlantic salmon (Salmo salar) have seen the best fry densities on the main Ribble catchment for the past 5 years with 20% of sites increasing in their grade score (Figure
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