Okay, I'm a cavy exhibitor and today exhibited at an ag show run by the Australian Koi Society. Anyway the show Koi were amazing but the koi for sale had a lot to be desired. They were packed in hundreds in tubs and sold 10 for $5. As they were packing up a whole tub of Koi got knocked onto the floor as well.

Anyway a kind well meaning "friend" bought me two koi, since they know I like fish . I now have two koi and by the time I realized that the bag of fish next to my cages was for me, well the koi people had packed up and left. So I now have two little 10 cm Koi.

How long do I have till they get to a foot long? I've got room for fish up to about 2 feet but any bigger and I'll need to rehome. Just trying to work out how long I have to work out what on earth to with them.

Pics when they finish acclimatising, ones fairly large and peachy colored and the other has the same peach colouring with black spots along his back.

Can anyone give me some good links to sexing them?

Thanks
Emma

A pic, anyone know what type they are? LOL

Top is Juliet, bottom Romeo

Top koi looks like shiro muji and the bottom koi looks like shiro bekko. At 4" forget about trying too sex them. It is near impossible unless you were the breeder and had an IDEA about how your young-uns turned out.
Regarding growth that can be quite the question where you will get many different answers. Give the koi lots of high quality water, great food, and lots of water changes and they can grow rapidly. I received an 8" chagoi bred by marusei koi farms that went to 12" in only 6 weeks. That would be an extreme as this fish had the genetics and lots of water.
In Aus you have too deal with home breds so the growth rates will be much slower.....because aus is probably 50 years behind what the rest of the world can import from japan.
These fish look very stubby so I'm guessing their overall growth rate will be slower...but they will not do well long term in an aquarium.
Get them in large water, feed them well, and do regular water changes and they will grow well. Maybe 12-15" in a years time.
Keep them in a tank and lower the feed rates and they might top out at 8-10".
It all depends.

Oooh thanks for that. Okies a years plenty of time LOl. As we've got major construction going on converting our pool into a 75 000l Koi Pond, I was just kinda worried that they'd end up being two feet before construction was finsihed.

Right now their in my growout tub with a few inch long goldies and two inch long perch. All are wintering in the tub so they'll hopefully be big enough to move outside with the big fish when spring comes. They get heaps of water changes and the tubs hooked up to an aquaponics system so water qualities not a prob.