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RE: Koi fry death rate?

saph.st24 — Tue, 04 Dec 2007 14:58:54 GMT

i had goldie fry last year and out of 200 that hatched i have 2 surivours and was told that was about right for natural selection

this year out of the 200 eggs shubumkinx comets i saved i had 100 fry hatched a few died with in days and 76 survived luckly i have rehomed them all but 9 of them which i am keeping

RE: Koi fry death rate?

Slickangler — Mon, 03 Dec 2007 19:34:26 GMT

testing morning / night as I do in the tank uses quite a lot of test solution so I use the pond care test kit. its cheap and theres lots of solution.

its also reasonably accurate you just need to check it against a known source (better kit) for calibration.

RE: Koi fry death rate?

dodgiedave — Mon, 03 Dec 2007 18:12:34 GMT

Thanks, i think I'm doing well at present I have lost less than alot of other people I know at this stage and the rest are doing really well! I will take you advice on the water checks, can you reccomend a test kit and what to test for an these checks, I am going to make small water changes on a fairly regular basis but never a big one all at once.

Thanks,

RE: Koi fry death rate?

Slickangler — Mon, 03 Dec 2007 17:51:17 GMT

I have no real expierience in keeping Koi fry but I would imagine they are similar to other fish.

yes you do lose fry for a variety of reasons.

the ones you call the runts, weak, skinny out of proportion fry tend to go first.

then you will get the very slow growers these tend to suffer from stresses and illness more than the bigger fry and are more prone to death for not so obvious reasons.

growth etc is controlled by the genes and you can have several identical looking fish but each will have different growth rates.

slow growing fry will always be slow growing and wil seldom achieve anything like the normal possible size on the other hand the fastest growing fish are not always the best.

just remember, a tank, tub etc is a small area of water and can be polluted very quickly (over night) and most casualties after 4-5 mths old is due to poor water quality so very regular checks are required.

hope this helps.

Koi fry death rate?

dodgiedave — Mon, 03 Dec 2007 13:27:35 GMT

I have recently started a quarantine set up in my garage for some fry to grow on over winter, I have 50 and they range from about 1-2" all are very healthy and feeding well the water is at 24 degrees and is very well filtered and has plenty of air. Is there an expected death rate of such immature Koi even in healthy conditions? Can I expect to loose some?

I have lost 3 so far and all three are the small runty looking ones, they started just being much slower than others and then end up weak floating about until they die, all the others still appear fine and have done so for several weeks now.

Should I be concerned or is this the norm?

Thanks,