Header Ads

We specialise in breeding Kohaku, the classic red and white patterned koi! And that allows us to offer a great choice at an affordable price for customers who appreciate this attractive variety.

We are available for visits by appointment, or can offer delivery if that is preferred.

Shiro utsuri kuroku

I feel like a proper koi breeder with my first kuroku completed this weekend.

The whirring and whining of the vacuum pump, lots of people sat around a table with plastic cups - some filled with fresh water, others with koi fry.  Lots of airline, and a calm and focussed faces from friends and family that came over at short notice to help us through it.  That's what it's like.

A BIG thankyou to Andy Corrie, Mark Dickinson, Mick Guttridge and Allan Dean - who all came over at really short notice on a bank holiday Monday to help out.

Here's the general principal - in a shiro utsuri spawning, the hatchlings are either black or white.  The black ones will develop sumi, and may develop into shiro utsuri - and the white ones will not.

This is based on the advice I've taken, and experiences of others - and we've collected a few sample shiro hatchlings and put them into a separate tank to check the results; this is focussed on the hatchlings that are bascially white, but with a tiny amount of black on them.  So, not completely white and also not completely black.

After a day and a half of kuroku, we still had several 10's of thousands of unsorted fry left; we timed out, and introduced them to the pond without being sorted.

The feeling today among the helpers was 70% to 80% of the fry are black.  That's much higher than when I looked on Saturday - and perhaps it's just that we now have a much larger sample.  Or perhaps more fry developed their black between Saturday and today (Monday).  Either way - I'm very happy about the stat because it bodes well for the spawning.  If I wanted to be increadibly positive then I'd say it was my new shiro male that was involved in the spawning a week ago that changed the balance to 70%/80% from the 30%/40% black fry that we experienced the last time we spawned this female.

The fry pond they've gone into is experiencing a daphnia bloom - and although a little early, it looks spectacular and I remember the May kohaku spawning went the same way last year and we had a great harvest.  lets hope it works that way again for the shiro's.

Here's a set of photo's that gives you an idea of what we've been up to.




















And, a few video's :

Shiro's in the bowl:



Kuroku  - and you can tell why we're all wearing ear defenders once you listen to this:








No comments