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Post by dunc85 on Dec 1, 2004 10:36:05 GMT -5
Today I caught two trout that were both showing signs of fungus and the fight was poorer than expected. I've seen a few fish in this water with white patches and it does seems that some fisheries are more affected than others.
I wasn't sure whether to put them back or kill them, and in the end I put them back, thinking that they were obviously feeding as they took my emerger pattern.
so...
1. Should I kill fish that show signs of fungus? 2. Will the fish get worse or can it recover? 3. What causes the fungus?
And now, should I disinfect my net?
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Post by Countryboy on Dec 1, 2004 10:46:11 GMT -5
Hi Dunc I'm sorry if a little off topic but I was amazed that you caught on an emerger today. Down here in Somerset we've only had a max temp of around 6 degrees today! Makes you wonder about matching the hatch principle doesn't it Countryboy
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Post by alan on Dec 1, 2004 11:12:30 GMT -5
The fungus name escapes memory at the moment, seems to affect mainly Rainbows in warmer weather. Once the fungus gets going the fish will swim oddly (often on one side), go blind so swim around in circles and then die. I think most fisheries would prefer that you removed the fish.
Again the dear old European Union is to blame, I know we should not always blame them but on this occasion it is the case, as they have banned fisheries using the only effective treatment. Sensible fisheries will screen out any obviously sick fish and once the water temperature drops it will go on holiday until next summer.
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Post by Sandison on Dec 1, 2004 18:07:49 GMT -5
Whirrling disease.
Treated by the application of malachite green; the use of which is and has been, EU/UK, banned for six years.
It is allegedly linked to cancer.
Still used, illegally, of course, by factory fish farmers because it is 'cheap'.
Bruce
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Post by dunc85 on Dec 1, 2004 18:48:09 GMT -5
I may be wrong, but it doesn't seem like whirling disease. The sites I looked at don't mention fungus, just the whirling and body deformation.
I've noticed that there seems to be one or two particular fish that are worst affected. you can spot them from the white patches. However, they've been there since at least september and they don't whirl, they just seem maybe slightly lethargic, although I have no way to compare them to the healthy trout. I presume they must be feeding to have survived until now, and I'm sure they are the same fish.
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Post by dunc85 on Dec 1, 2004 18:49:48 GMT -5
Hi Dunc I'm sorry if a little off topic but I was amazed that you caught on an emerger today. Countryboy I don't know what temp it was here in Lancaster, but it seemed relatively warm. There were definately flies buzzing about, and I saw a few green midges on the surface. The water I was at always seems to have fish rising, although I can never see what they are eating.
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Post by richardw on Dec 2, 2004 3:01:48 GMT -5
What species of trout were they?
richard
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Post by Rich on Dec 2, 2004 4:58:07 GMT -5
And now, should I disinfect my net? I would say yes - better to be safe than sorry. Jeyes Fluid is very good for this.
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Post by Gnat on Dec 2, 2004 5:14:26 GMT -5
Sounds like UDN (ulcerative dermal necrosis), but as far as I'm aware, this only affects salmon and sea trout. I would inform your local fisheries officer of this matter as soon as possible and get it clarified as these fungal type of diseases are generally contagious. Best, Gnat.
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Post by dunc85 on Dec 2, 2004 5:34:54 GMT -5
I wonder if it's Saprolegnia, it came up on a google search and sounds similar. It seems to be a secondary infection which takes hold if the fish is already in a weakened state.
I thought it may have been due to poor handling, but for both fish to have it seems a bit too much of a coincidence.
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Post by charlieH on Dec 2, 2004 5:40:42 GMT -5
I'm no expert, but I don't think UDN and whirling disease are the likely candidates. Incidentally, I think UDN itself is a virus, and the the fungus is a secondary infection associated with it. Have a look at the first para of a post from Warren S on this recent thread. flyforums.proboards35.com/index.cgi?board=general&action=display&thread=1100071930It seems that fungus on trout is not uncommon at this time of year, and is associated with handling of the fish.
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Post by Peterfry on Dec 2, 2004 6:48:09 GMT -5
I always put these sort of fish back as I am sure the pike appreciat an easy meal. The last time I saw one was at Haningfield, it was a huge fish of around 8lb and was covered in fungus from head to toe. Peter
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Post by Dunbar on Dec 2, 2004 9:32:21 GMT -5
Whilst I am certainly not an expert in this area, I think Dunc45 may be correct in that it is saprolegnia - this is a common fungal growth and one which can take a severe hold on salmon and trout either in the spring and back end (season's that is, not part of the salmon ;D) It is quite common to spot many fish like this close to spawning time when they have suffered lesions, abrasions etc and the fungal infection has taken hold.
Whilst Bruce makes a fair point about the use of malachite green in fish farms, it is fair to say that its ban has had a devastating effect for those wild fish hatcheries who are attempting to recondition spring salmon kelts in an attempt to avoid continuing having to take fish each year from the wild. Malachite is very effective treatment for saprolegnia, other treatments, like salt baths are not nearly as effective. It is just unfortunate that again the wild fish have been subjected to another 'side effect' of the fish farming industry.
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Post by richardw on Dec 2, 2004 10:19:05 GMT -5
May I refer you to my previous question? "What species of trout were they?" richard
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Post by Clydesider on Dec 2, 2004 10:35:07 GMT -5
It was an Apache trout I think, Get it?! A patchy trout... BOOM BOOM! Ahm a pure terr, so ah um! ;D
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