Fisheries Report
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2012 Environment Agency River Tud 2012 FISHERIES REPORT Standard Notice – Non-Commercial Information warning We, the Environment Agency, do not promise that the information supplied to you will always be accurate, complete or up to date or that the information will provide any particular facilities or functions or be suitable for any particular purpose. You, the recipient of the information must ensure that the information meet your needs and are entirely responsible for the consequences of using the Information. If an electronic format has been used, we do not promise that the media on which the information is provided will always be free from defects, computer viruses, worms, Trojan horses, software locks or other similar code of a destructive or unwelcome nature. You should carry out all necessary checks prior to loading the information on to your computer system. Please also note any specific information warning supplied to you. 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Flowing easterly for 24 kilometres, the River Tud descends 55 metres before its confluence with the River Wensum. Average river gradient is therefore 2.29 metres km-1. Two physical barriers exist along the watercourse: one between the Berry Hall and A47 sites while the other lies between Hill Farm and Costessey gravel works. Both barriers are classed as moderate to fish migration. Figure 1: Location of the River Tud, Catchment, 8 survey sites and recommended fishing sites 2012. Results for fish caught over 99 mm fork-length (FL) from the eight sites shown on the map form the basis of this report, Surveys took place between May and June, 2012 using PDC electro-fishing methodology. Only data for fish over 99 mm FL are analysed in depth as electro-fishing is inefficient below this band. Thirteen fish species caught during the surveys constitute the River Tud Piscean community in 2012. Brown Trout account for 68 % of the 584 individual fish caught throughout the surveys. Mean overall fish density (number of fish in an area) of 13.9 individuals 100 m-2 recorded in 2012 is marginally lower than the 2009 value of 14.1 individuals 100 m-2. Mean Trout density recorded in 2012 (8.9 individuals 100 m-2) increased by 29% compared to the 2009 value (6.9 individuals 100 m-2) and is the highest value recorded to date. Eel density in 2012 (0.20 individuals 100 m-2) shows a reduction of 46% compared to 2009 (0.46 individuals 100 m-2). The average standing crop (weight of fish in a given area) decreased from the 2009 value of 1444 g 100 m-2 to the 2012 value of 1188 g 100 m-2 ; a reduction of 17%. Density composition 2012 (>99 mm) Standing crop composition 2012 (>99 mm) 2% 2% 1% 2% Brown / sea 4% 5% trout 8% 9% Dace Chub 13% 17% Roach 64% European eels > elvers 73% Others Pie charts representing percentage density and standing crop of fish sampled in the River Tud between 15th May and 26th June 2012.