BranMuffin
Koi Kichi
Nov 30, 2003, 1:50 AM
Post #2 of 3
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Several possible issues and as I go through my thinkin process, I will type them down.
Even though they are Fry's, they still need plenty of oxygen ... but not directed directly at them! A cheap aerator and a very fine aerating stone at the very corner of the tank will do. Fry's are very fragile and even harsh bubbles can kill them in an instant.
The tank needs some kind of a filtration system to process the water because water goes bad (stale) after a few days, even if you don't see anything in your test kits. The problem with filtration is keeping the tiny frys from getting sucked into the filter. A fine mesh netting surrounding the inlet will help. The trick is keeping them away from the suction area.
Before you replace with Fresh Water, be absolutely sure to remove Chlorine, Chloramines and Ammonia by using a Dichlorinator. Then try to even out the water temperature to the nearest 3 degress. Replace only 10% of the water and do it S-L-O-W-L-Y, don't just dump it in there.
Fry's are very succeptible to diseases and even the smallest amount of bacteria will kill them. Some people will put Methelyne blue in the water to try and control the bacteria. Anything stronger may kill them.
Fry's are very sensitve to sudden temperature and water parameter changes. Even the slightest change in temperature will kill off the weak ones ... and there are several of them. Ph may fluctuate during day and night and this will have a major affect on them.
There are fry's called Tobis (sp). These are fish that grow very fast (Magois, Chagois, Ogons and other plain colored koi), that will attack and kill smaller and weaker fry's. That's one of the reasons why professional breeders cull their fry's every couple of weeks ... one of them is to separate the Tobis. They used several sizes of screens with their nets using a slightly larger screen to trap the tobis and put them in another holding area.
Finally, there's nature which will kill off several of them without any known reason. A large koi can have as many as 250,000 eggs. If nature didn't try and control them ... that's one heck of a population! Think of several koi spawing in the rivers at one time ... if this didn't happen, it would become over populated pronto!
Hope this helps some
Best Regards
Bran
A Koi Pond is never FINISHED, it's always subject to improvement.
Drives the Spouse Crazy!
(This post was edited by BranMuffin on Nov 30, 2003, 1:54 AM)
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