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Thread: Koi fry

  1. #1

    Koi fry

    Hi all quick question. I'm planning on building a new pond when I move into my house it'll be between 10000 and 12000 litres hopefully depending on size of the garden. I'll run a spindrifer aerated bottom drain with an Evo aqua 70 airpump then a nexus 220 with A separate air pump running into a varipump 20000 and through a 55watt uv and back into pond. I wanted to get some fry from cuttlebrook and wondered if this size pond could accommodate 1000 or atleast 500 I know I can't keep them all in to adulthood I'd grow them choose best for keeping and sell/ give away others. I'd cover bottom drain so fish can't get sucked in am just wondering how many fry this setup can accommodate. Thanks in advance guys



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    Senior Member Rank = Yonsai algarth's Avatar
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    What size are you thinking

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    Senior Member Rank = Grand Champion RS2OOO's Avatar
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    You can have as many fry as you like in that volume as long as you can keep the water parameters in check. One slight hiccup with those and you could lose the lot very quickly.

    But Fry grow fast, and at 12 Weeks old they could be over 8cm long (mine were over 10cm at 12 weeks despite going through 2 weeks of no growth due to suspected CEV), which with 1000 fry is 80 metres of fish in 10,000 litres!

    So it all depends on how quickly you'll be whittling the numbers down as they grow, how much you feed and how much water you change.

    If you can do it right and change 30% of water daily I think its possible to raise 500 fry to 25 cm in 10,000 litres, but it is very hard work and if your tap KH is below 8dH and you're feeding heavy you might find it gets depleted within 24 hours.

    The above is partially based on my experience of growing just 5 fingerlings in 380 litres of water. I was feeding loads and they were in that vat right up till they reached approx 35cm at 11 months old, which was 1.6 metres of fish in 380 litres at the peak.

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  7. #4
    Hi it'll be 1" fry from cuttlebrook won't be til next year just planning ahead ready for when I get my new house and pond. Just wanna be fully researched in everything and plan ahead

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    Cheers rs2000 really appreciate all the advice thanks so much

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    Senior Member Rank = Grand Champion RS2OOO's Avatar
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    Quote Originally Posted by craig88 View Post
    Cheers rs2000 really appreciate all the advice thanks so much
    Your welcome mate, but bear in mind not everything I've said will be accurate for your particular set up, just food for thought really.

    Because of the tiny water volume I raised my fry in and the amount I was feeding (constant food supply more or less), if my tap KH was really low I'd have been looking at a pH crash within a few hours. This was the one situation where super hard water allowed me to push feeding to its limits in such a small tank.

    Sent from my Pixel 2 using Tapatalk

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