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Hi Donald,
I am not sure why you call the circled point a 'Stress point', but as you can see from the inset more clearly, this is merely where the pattern follows the scales. But the way that it is, is such that you have one white scale, which is showing through the Sashi of the scales behind it. What I mean't about problems with the Hi plate, is that it is very common to have uneven colour throughout the length of the Koi, or to have a few scales within the Hi plate, that have no colour pigment.
Hi Bekko,
as Maurice has said, these Showa were all selected from black fry. But, in answer to Maurice's question... I don't knoow if there is Sanke blood in these Showa, but if there is, then it would have been introduced several generations ago, as the parents of these Showa, are all from Showa parents. I think that you are generally right in saying that the Sumi will show on the Hi plate earlier than on the Shiroji, but as Maurice says, you have to find that 'one scale' of decent Sumi somewhere on the Koi. Not Kage Sumi, but good glossy black starting from the root of the scale.
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