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Rainbow Trout Fin Rot?
http://www.backyardaquaponics.com/forum/viewtopic.php?f=29&t=28943
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Author:  bc201081 [ Jul 30th, '17, 17:34 ]
Post subject:  Rainbow Trout Fin Rot?

This is my first AP system, I have 30 Rainbow and 30 Brown Trout in a 3500L tank with a 1000L sump, everything has been fine since I introduced the fish about 3 months ago but recently I have noticed a large number of the Rainbow trout have whitening and erosion on their dorsal fin but the brown trout don't seem to be effected. Is this fin rot? and does it need treatment? if so what do people recommend I should do?

Author:  Gunagulla [ Jul 30th, '17, 18:00 ]
Post subject:  Re: Rainbow Trout Fin Rot?

I use a UV steriliser if I notice fin rot on my rainbows (it has only happened in cold weather for me), in fact I've been running the UV for the past few weeks because of it, and the incidence and severity has noticably decreased. Last winter I did the same and it cleaned up the rot then too.

Author:  bc201081 [ Aug 2nd, '17, 15:31 ]
Post subject:  Re: Rainbow Trout Fin Rot?

Gunagulla wrote:
I use a UV steriliser if I notice fin rot on my rainbows (it has only happened in cold weather for me), in fact I've been running the UV for the past few weeks because of it, and the incidence and severity has noticably decreased. Last winter I did the same and it cleaned up the rot then too.


Thank's for the reply, As I said Im very new to aquaponics so forgive me for all the questions but Im assuming that if the UV steriliser helps treat/prevent fin rot then then the fin rot must be caused by a bacteria in the system, correct? Does the UV steriliser effect the rest of the system ie grow bed bacteria? Do the effected fins grow back? What else might contribute to fin rot? About 2 weeks ago I added some trace elements to the system also the PH has been sitting around 8.0 could this be contributing?

And lastly what size UV steriliser do you use? I started looking at them but wasn't sure what size/wattage to buy.

Thank's Brad

Author:  Gunagulla [ Aug 3rd, '17, 11:48 ]
Post subject:  Re: Rainbow Trout Fin Rot?

Yes, fin rot is generally caused by bacteria. The UV steriliser wont affect the good bacteria which mostly live on the grow bed media, as they are not exposed to it. pH8 is quite high, but I doubt that is related to fin rot.

Adding pure NaCl salt to 1-2ppt also helps treat it. The treatments that are often recommended by aquarium shops are generally not suitable for AP.

My UV steriliser has a 40W light in a stainless steel tube, and I run about 5000lph through it.

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