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ya know, not to beat this ' daphnia thing' to death, but if you look at the longer history ( early 1800s to 1940s) of magoi (and eventually higoi and mutation focus and finally higoi crosses) in Niigata over the modern nishikigoi production ( 1950 to the present) you see that koi were traditionally reared in rice paddies. There, the main food was mosquito larva. From there and at a certain age, the silk worm was used as the silk industry was common and later, booming. It was a cheap source of protein and had a high fat content so growth must have looked impressive compared to mosquito based diets. Just some 'food' for thought? JR
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