Ovulation in koi carp – Video

Video credit: Mohamed Atta (Egypt)  –  Review: Abdel Rahman El Gamal (Founder of the video channel)

This video has been filmed in a koi hatchery in Vietnam.

The focus of this short video is to share how the ovulation looks like in Koi carp which will be almost the same in most fish species. It should be emphasized that the spotting of ovulation time is critical regarding the subsequent phases including fertilization till hatching bearing in mind that if ovulated eggs are not stripped within specific period, eggs turn overripe and hence cannot be fertilized.

The video shows two female undergoing the stripping process. The first females seems not ovulating yet and she may ovulate shortly after as batch of eggs obtained was unnoticed. On the other hand, the second female was ovulating as the stripping went easy and eggs are flowing freely uninterrupted. There are several observations which could be mentioned here including that the handled females were not anesthetized probably because of their relative to medium sizes. Instead, eyes are covered and caudal peduncle that proved to calm the fish.

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