Phil,here down south most of our river fisheries are totally unbalanced,fish numbers are poor,of most sizes,this of course varies year on year for smaller fish,its the fish of moderate sizes that seem scarcer,you know,the 1-1.5lb chub,the 10-14oz roach,perch 8ozs-1lb,in all my years fishing the river(and its quite a few now)I've never known all these species to be 'missing' at the same time in these sizes,cycles usually mean some species flourish at different times,thus filling a niche,but not seemingly these days.
Alan (Whitty) regarding the above and a comment you made earlier about above Bedford on the Gt. Ouse, an area I’ve never fished but have visited the wider area a couple of times and know it’s geography, morphology and land management/usage. From an angling perspective I know it better lower down in the Fens.
That said, there is a lot of information out there about the problems of the area environmentally and ecologically of the land use aspect. There’s also information relating to the river and its catchment problems including fish assemblages as well.
A virtual Google Earth (where would we be these days without it?) walking tour of the upper river above Bedford shows how rural and arable it is. That alone should ring alarm bells to anyone who has ever watched or read about the problems such areas suffer from, such as soil loss, constant and over use of pesticides (generic term for all cides). All of which end up ultimately in the river at some point. Add to that the waste treated and untreated water from a catchement population of around 300,000 entering the river, it's a toxic brew to say the least and fish are supposed to swim about in it and thrive?
Then there's the predation aspect before the otter chips in its bit, of Signal Crays eating the eggs after any spawning has happened, gooseander and cormorant both taking different sized pray. Siltation of the spawning beds from the soil loss of the prairie type environment.
All in all adding up to a very sick river indeed. Which in my view has and is manifesting itself in what you are seeing today, a river in environmental and ecological crisis.
Culling otters will not solve the problem because even with them removed, the river and many more up and down the country, are not and will not be sustainable unless and until the fundamental and underlining problems are addressed and SOLVED.
Until that hard choice is taken by the powers that be, the EA will keep sticking plasters on the problem and stocking fish into that failing environment to appease the clamour for something to be done. The reality is it is just kicking the can down the road for the next decade.
Where no doubt the next barbel Messiah will come along offering simplistic solutions to complex problems beyond his comprehension.
I will argue on Rayner(sorry I don't know your name),otters will never even out while humans rescue Kitts and feed them on for release,that is not natures way,human nature,maybe....
Alan as I've already posted above the numbers are so few 10-15 per year release nationally, that they are insignificant to make any impact in the grand scheme of things.
As to it being not nature's way – it's also not nature's way that man placed them in the rehab ward in the first place.*
Cubs being orphaned by the mother being killed in road accidents with cars. 70% of the 1000 + otters autopsied by the Vincent Wildlife Trust and Exeter Uni were found to have died via road accidents*
Death of the mother through accumulated toxins in their food chain. Toxins put there by man.
Mothers getting drown by traps put there by man. Liver fluke contracted from dogs kept as pets by man.