The 2011 catch was 180% of the 1998 figure. Yet since the late 90's the number of anglers has declined by more than two thirds. This suggests strongly that the stock is increasing. If we look at catch-per-unit-effort we can see the trend over the last decade or so more clearly.
Flows impact very strongly on the distribution of the rod catch with the navigation weirs on the lower river accounting for the majority of fish in low water years. This pattern was again evident in the 2011 catches. The lower river is a very long stretch of river, but the effective fishing area is made up mainly from a handful of weir pools. Over 65% of the fish reported from below Stourport actually came from just one such hotspot: Diglis weir at Worcester.
Prior to 2009 the catch from below Bridgnorth would've been considerably higher in a drought year. However, changes of ownership at one particularly productive low water fishery has led to a big reduction in catches. This is due to less rod effort and highly productive water remaining un-fished.
The graph below represents fish reported to me for the T&S monthly report. It isn't exhaustive, but I believe it does give a broadly accurate picture.
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