Koi by Go Kinoshita

Diagrams in BOS Convention 2002 Spring
Diagrams in Tanteidan 5th convention
Folded from a square double-sided Unryu paper

Koi by KuCha (Mai Mingliang)

Diagrams in Chinese New Year Origami 2020
Diagrams in Origami Record 2019-2
Diagrams in Two-Color Origami Adventures by KuCha (Mai Mingliang)
Folded from a square of Duo Thai origami paper

Koi by Marc Kirschenbaum

Diagrams in Origami by the Sea by Marc Kirschenbaum
Diagrams in Quadrato Magico Magazine 130
Folded from a square of Duo Thai paper

Koi by Michael G. LaFosse

Diagrams in Advanced Origami by Michael G. LaFosse and Richard L. Alexander
Diagrams in MFPP 1997 Convention
Wet-folded from a square of very heavy art-paper, with application of colored paper for the spots

Koi by Miyajima Noboru

Diagrams in Origami Instruction Book by Miyajima Noboru
Diagrams in Tanteidan 17th convention
Folded from a square of Tant paper

Koi by Robert J. Lang

Diagrams in Origami Design Secrets - 2nd edition by Robert J. Lang
Folded from a square of holographic paper

Koi by Sipho Mabona

Diagrams in Der Falter 52
Diagrams in Origami Worldwide by John Montroll and Brian K. Webb
Diagrams in Tanteidan 14th convention
Wet-folded from a square of card-stock, with application of colored paper for the spot

Koi carp by Meng Weining (212moving)

Diagrams in Origami Moments by Meng Weining (212moving)
Folded from a square of Duo Thai origami paper