One lethargic koi

All questions about keeping the king of pond fish here, including koi pond building.
nickwhite91
Posts: 4
Joined: Mon Jun 12, 2017 7:50 pm

One lethargic koi

Postby nickwhite91 » Tue Jun 27, 2017 7:54 pm

Relatively new to pond life. Inherited a pond with some Rudd in there. I have since added some koi.

I first added two koi in April, for a while they were lethargic and not swimming with the Rudd, now they fly around and always eat the food.

End of May I added three more koi, and unfortunately lost one within a week, found it floating in the pond weed. The other two have survived, however one is considerably more lethargic, never seems to eat the food (occasionally as food sinks it might) and spends lots of time around the waterfall.

It predominantly swims along the bottom, usually quite slow. I did catch it and it flapped around a lot and then swam off slowly.

I assume my next step is to test the water? It's just strange out of nearly 30 fish, only one is affected?

Any advice appreciated.

daz4321
Posts: 4710
Joined: Mon Feb 18, 2008 9:35 pm

Re: One lethargic koi

Postby daz4321 » Tue Jun 27, 2017 8:54 pm

pond size (dimensions would be nice)
filter set up and flow rates
aeration used or not
sizes of fish
and water test results.

nickwhite91
Posts: 4
Joined: Mon Jun 12, 2017 7:50 pm

Re: One lethargic koi

Postby nickwhite91 » Tue Jun 27, 2017 10:17 pm

It's roughly 2500-3000 litres
Fishmate 5000 filter
Laguna maxflo pump
Waterfall
Approx 15 Rudd 3-4"
4 koi 5-8"

I need to get a test kit to look for water issues

daz4321
Posts: 4710
Joined: Mon Feb 18, 2008 9:35 pm

Re: One lethargic koi

Postby daz4321 » Wed Jun 28, 2017 7:30 am

small pond
questionable filter (manufacturer quotes this filters 5000l with no fish and only 2500 with fish but NO KOI)
maximum stocking for the 1 inch per 10 gallon guide if smallest sizes of fish are used if largest are used the pond is overstocked.(koi are often much stocked at much lower densities than this i.e. 1 inch per 50 gallon)

to me looks like it is going to be water quality issues due to inadequate filtration and overstocking, remember you cannot test for pheremones that suppress not only growth but also immune response, also oxygen levels may well be low due to the amount of fish living there.

nickwhite91
Posts: 4
Joined: Mon Jun 12, 2017 7:50 pm

Re: One lethargic koi

Postby nickwhite91 » Wed Jun 28, 2017 9:41 am

I did actually give around 10 Rudd away last week, maybe I should get rid of a few more?

Funny you mention the filter, as it's not a UV one I was looking at replacing it. Any recommendations?


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nickwhite91
Posts: 4
Joined: Mon Jun 12, 2017 7:50 pm

Re: One lethargic koi

Postby nickwhite91 » Mon Jul 03, 2017 8:45 pm

Another koi dead! That's 2 out of the 3 that have died. All the other fish look really healthy and eat well. Thinking back the dead koi never seemed to eat even when they appeared healthy?!


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