You created a great site about koi, then your link can be here... What you need to do... Just become a member. The ITKL has a registration-program that counts hits recieved due to the HTML-block... The more surfers push the next-link on your ITKL-block, the higher you will be in the classification, the more visits you will recieve,...
The counting is done for a specific period, so new members don't have to make up arrears. So don't hesitate, for a great site like yours it must be real easy to achieve a place in the top 10.