Is my Koi Male or Female

Published: Sat, 25 Sep 2021 13:21:13

By: Steve Knowles

Determining the sex of your koi fish can prove difficult. This is especially true if the koi are still young. Is my Koi Male or Female

Take note of your koi fish’s eating habits. Females tend to be more aggressive during feedings, staying near the surface and continually eating, while male koi swim around more throughout the session.The males tend to take a pellet of food and dive away from the group.

You can also identify a koi’s gender by examining the vent area on the underside of the fish. A male koi will have a line from head to tail. A female koi will have the same line, but will also have another crossing in a “T” shape. A female’s vent will also be more round and more pink than a male’s. As you note in the photo this is a Female Vent

Sexing, or identifying the sex, can be difficult if the koi is under a foot long. However, with older koi you can easily identify the gender by comparing size. Generally, male koi are slimmer and smaller than their female counterparts. Female koi have a fuller body and broader shoulders. However, at a young age, male koi are typically larger than female. Male koi may also have larger pectoral fins than females. These fins are more pointed than round female fins.



Is my Koi Male or Female

Fins can be another tell-tale sign

One of the most obvious differences between male and female koi of any age is the fins. Fins on female koi generally are less colorful than those of the males. Female koi fins also tend to be larger. The edges of a fins on female koi are more rounded and more opaque than the fins of males. The fins on the male koi have a more pointed appearance and tend toward more solid coloration.

Description: A question asked the most of us, is my Koi male or female and how do you tell
Key Words: Male Koi, Female Koi, Body Types, Spawning