How to make Jumbo Tosai Vol. 2 – Gender check – Posted on 29/04/2010 by IsaKoiFarm <Comment in movie> As you can find from movie, it is easier to judge gender of koi after we keep them in hunging net. However, we have to be careful not to keep them for long because they would be injured. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.