I study fisheries management and have never heard of this . Intrigued i have looked in to it and google brought nothing up . From my expereince, certain diseases, viruses or parasites can affect any species of cyprinid. (Carpfamily=Carp,tench,roach,rudd,chub,ide,orfe,bream,dace,bleak and any other species ) For example KHV (Koi Herpes Virus) or SVC (Spring Viraemia of Carp) Effect just carp. However there will be strains of the diseases/parasites or viruses that will effect roach directly or all cyprinids in general as it may just not be the roach in this pond with the problem. I'm not sure as to what this problem is with the roach at this fishery but as with any Disease/Virus/Parasite, The usual precautions must be adheered to.
Don't use keepnets at the fishery to prevent the spread to somwhere else.
Wash all landing nets thoroughly, again for the same reason.
Finally make sure that anything that may have come in to contact with fish from this pond is sanitized, i.e. clothes, footwear, keepnet bags (Infected water may collect in the bottom) or anything of the like
This is a new one to me as i say, it may be worth phoning the Environment Agency if the fishery hasn't done already .
I will ask though, could you describe the symptoms to me and i may be able to link it with a Disease/Virus/parasite that matches them .
Ok well when we came back we washed everything in dettol and rinsed it and rinsed and rinsed some more. Luckily we both broke our landing nets at the venue so bought some more and have never returned back to fish there.
It was a "regular" that told us about the synonymous 'roach' disease that ended in organs failing on fish through presumably a gene defect. Not a good method of a resource i know but it just got me intrigued into what it was if anything. And because we go here, there and everywhere was worried, about cross-infection, but is there any necessity for this?
It's possible that the Roach at this venue were of poor quality to begin with, when they were stocked, and thus are the first ones to suffer when somethig else isnt quite right or genetically they arent sound.
Personally as i have the knowledge to identify some diseases nemo i would not take 'regulars' words as gospel, but wait until i could have a good look at a fish myself. The problem with fish diseases/viruses/parasites is they all effect them in different ways some can be external others internal and some a mixture of both and symptoms can also be internal, external or a mixture of both so it can be quite difficult to put your finger on what it is. The only real way to get an answer to this is by sending a fish to be analysed by fisheries scientists as symptoms may not be external therefore without killing a few fish and disecting them, you cant tell what the problem is, if there is one.
There are several other things to take in to consideration though, the major one being the point eranu has highlighted. The strain of fish the lake had been stocked with may just be defective and generally unwell, not with a disease, virus or parasite though. Also, bad treatment by anglers could be causeing 'some' of the roach to go belly up.
Like i say about sanitizing everything you seem to have that covered .
Still this has stumped me, Don't think it is blackspot as nemo hasnt mentioned any external symptoms which funnily enough would be black spots ;D .
There were no visible external symptoms on any of the dead fish that were floating around and unfortunately we only caught crusians which seemed to be in good health!! So if your interested you can take a look if you don't already know about the venue and it's 'issues' (if any!!), I'll let you know in a private message what venue it is ,if your bothered!
*My best friend gave me the best advice. She said everyday is a gift and not a given right*