A handful of nice Koi Tattoos images I identified:

鬼若丸 Oniwakamaru – Fresh ink!
Koi Tattoos

Image by /amf
Depois de alguns anos resolvi fechar os braços também.

Koi tattoo – Mauricio Teodoro / Black Dragon Tattoo (São Paulo/SP/BR)
Right Arm – 23h00 of perform by now.
Study about – koi.amfdesigner.com

Self Portrait with Koi
Koi Tattoos

Image by ElDave
Not me in the photo.