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Byer Koi Farm is a UK Koi Farm based in Hertfordshire. We sell Koi Carp, Koi Fry, Small Koi, Tosai and Nisai

the developing shiro eggs

shiro fertilisation rate is roughly what I thought, but there is the odd patch which has been a higher fertilisation rate like this one

I believe the pairs of black dots are the developing koi's eyes!

the translucent eggs with black dots are the fertilised ones and the white ones are not going to develop