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Old 13-06-2013, 04:09 PM   #1 (permalink)
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Default red dorsal fins


Hi can't find any parasites with microscope spent ages looking ? the Odd fish flashing but main concern is the two koi i looked at have red looking dorsal fins ?scraped this area but come up with nothing all fish eating well .all water readings spot on . 5000 gall. uv light. skimmer. very large 4 vortex type chambers one k1 moving bed chamber one jap mating one brush and vortex should be pleased not finding anything but i know something is going on ??? did a scrape last week found 1 chillidonella any help would be very welcome can't treat what i can't find . thought about giving the fish that a suffering a salt bath just to relive them a bit . any ideas would be welcome
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Old 13-06-2013, 10:35 PM   #2 (permalink)
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Did you treat for chillidonella?
If not then I'm thinking they may have multiplied?

However if you are saying scrapes are clean, I'm assuming you've done the standard and scraped 4 different koi?

What's the water params ?

apart from redness any other strange behaviour i.e. hangin, floating at surface, sulking at the bottom, hiding in a corner, clamped fins, flicking fins, jumping or lunking?

If water params are ok and no sign of parasites it may be a bacterial infection in which case chloramine T will sort you out.
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Old 14-06-2013, 08:59 AM   #3 (permalink)
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Default dorsal fins


Hi Stu thanks for your reply . I have spent ages on scope but i am not that good at it can you tell me the best place to scrape i scraped the tail and dorsal fin area i have real problems doing scrapes as my fish are big and i can't keep them still for long enough they hate the net .Is it best to look around the edge of the mucus or actually in the mucus ? a friend told me years ago to look around the edge after adding a drop of pond water to the slide? this worked really well when i had costia and flukes last year .I have seen very little flashing and it is so strange all fish eating well even the fish with red dorsal fins?i have occasionally noticed fish darting a bit, but it is hard to see any abnormal behavior as my pond is raised and i have to go close to it to see what is going on then they see me {the food man}then they are like performing seals .The fish that is having most problems is around 30 years old just wish i could find the problem.
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Old 14-06-2013, 11:39 PM   #4 (permalink)
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hi, best to bowl the koi to scrape, that way you can hold him to the side of the bowl and keep him still while scraping. Water level should be just below the top of the koi in the bowl.

Scrape from the edge of the gill plate (careful of the membrane). and also from the top of the head and down the back to the side of the dorsal fin.

You won't get much mucus from scraping the fins themselves. But if there are parasites on the fins they will most likely be on the body too.

Is this the only koi with problems ?

Slide wise if you add a drop of water then yes, costia will usually be around the edge. If you've only ever seen costia and fluke under the scope something new will be hard to spot.

Where are you located?
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Old 15-06-2013, 07:42 AM   #5 (permalink)
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HI STU Thanks for your reply i will try using a bowl .I do have problems what ever way i try i have M.S so things are always a problem just have to do best i can .STU i am to far away from you wish i was a bit closer .I will have to do another scrap today to see if i can find anything wish me luck thanks STU
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Old 20-06-2013, 11:54 PM   #6 (permalink)
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good luck mate
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Old 21-06-2013, 12:21 PM   #7 (permalink)
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Yes good luck. I use a plastic credit/club card thing, if u but it in boiled water from kettle it gets a nice curve to it the fits nicely to body of the koi.
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Old 21-06-2013, 01:12 PM   #8 (permalink)
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Good tip, Laura. Lovely to see you back on the site, x
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Old 22-06-2013, 09:16 PM   #9 (permalink)
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thanks viv, im skiving from doing my final two essays lol
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