Silver Butterfly

How can I tell if my two koi’s are a boy and girl?

I have one black butterfly koi with a silver belly and one younger koi that’s orange and black which I feel could be half goldfish. I wanted to know their genders because I want them (after a while) to breed. Any help would be nice. Thanks.

The differences between the sexes become more apparent as they age, particularly so in the spawning season. Male koi are slender, compact and torpedo-like in appearance, with very trim lines and smooth body contours. They also show behaviour that is particular to male koi and is particularly noticeable when all male koi are segregated into a single tank. Male koi tend to dart around energetically, with sharp turns of speed, showing real ‘attitude’ and a skittish character. They are less trusting than the opposite sex and this shy temperament is all the more apparent at feeding time when they will take considerably longer than females to feed at the surface.

The key distinguishing physical feature that male koi possess develop in late spring as they come into breeding condition. Often mistaken for whitespot, breeding tubercles appear on the head, flanks and tail of mature male broodfish. To the touch, these tubercles make the typically slippery koi feel ‘as rough as sand paper’ giving them better purchase for when they drive and push against gravid females in an attempt to expel their eggs. In darker koi, white tubercles will be clearly visible but on paler or metallic koi, tubercles may only be evident to the touch.

Females on the other hand, do not develop tubercles nor will they retain the sleek lines of a male as the breeding season approaches. Eggs that develop in the ovaries will swell, leading to an increase in volume to the abdomen. In addition, female koi tend to behave in a less timid manner to a tank full of males, feeding voraciously as soon as the food hits the water. Whether these characteristics are as well defined and identifiable in a pond of mixed koi is debatable, but males are still less likely to be the first to feed of the surface.

Good luck Tia

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