Koi fish disease?

Question

Koi fish in my pond started to die. when all died changed the water & stuff then bought 3 more kois , but they died within 2 days !! Why?? Is there sum kinda disease

Answer 1

Maybe your koi fish are unable to withstand water temperatures or they dont suit to the pond environment.

Water temperature regulation is very important for their survival.

Answer 2

several reason why this could happen and as they are dying quiet quickly, it is likely to be a water problem.

make sure there is enough oxygen being dissolved in the water. water loses the ability to hold oxygen the warmer it gets.

so either an air pump or or filter water returning to the pond above water level to create some surface agitation ( splashing)  this creates extra oxygen.

secondly it could be unsutable pond set up. koi need around 4 feet of water and some shaded areas this creates differing water temps thoughout the pond and the fish can move to more comfortable  areas depending on the time of day.

the other thing is getting good strong fish to start with.

a healthy fish will be able to deal with the stress of being moved to a new pond alot easier than an ill fish. make sure they look in good condition before buying and keep an  extra close eye on them for at least a month. if any symptoms show like fins looking damaged then treat it straight away to increase their chance of survival.

float any new fish in the bags on the pond for an hour and slowly add small amounts of water from the pond to the bags (a little every ten mins or so) this will aslo help the fish acclimatise to their new home before releasing.

also check ammonia/nitrite levels.

any un eaten food or decaying plants/leaves will also cause ammonia.

make sure run off water dont run into pond from elsewhere (may polute pond)

the only other thing is someone deliberately poisoning them, in this case i would suggest a good f.b.i agent.

hope most of this helps.

Answer 3

Is your pond newly build?  Agree your pond could be too shallow not deep enough which could be in a certain point of high temperature and could kill the koi.  And newly bought fish should be quarantine before throughing them to the pond.

Suggestion clean everything start from the start buy new koi quarantine it first indoors observe for 3 to 4 weeks if they are good and healthy, if your pond is in direct sunligh put some shade