KEEP THE TRADITION OF SALMON NETTING ON THE TAMAR TAVY


Guest

/ #49

2014-04-01 09:05

Then lets stick to the facts the Gunnislake counter has been used to calculate the RSE and CL and
has been found to be under reporting especially in high water events which for the spate rivers
flowing from the moors must be quite frequent. If the under reporting involves 20% or even 30% of the Tamar stock then it is consievable to deduct CL compliance would have been achieved in every year.But of course since it's inception in 1994 various problems relating to resistivity counters have been highlighted in a plethora of scientific studies and also video validation all
which apply to Gunnislake.Water Conductivity,shoaling,camera shutter speeds etc.etc have all been identified as potential reasons for an inaccurate stock analysis and evaluation. As the main
component of stock assessment calculations and resultant management strategy the accuracy and reliability of Gunnislake data is vital.If we take the 1994 figures for returning salmon we have
6245 1995 we have 5581 which can be explained by teething problems of the Logie 2001 model but then there is a significant drop which could be explained by the conclusions of the Toms 2013 study. If this underreporting had been presented to a public enquiry the Inspector would have thrown the case out.