Discover everything about koi: from pond design and water quality to fish selection, feeding, breeding, health, and seasonal care for a healthy environment. Koi are ornamental carp with a long history in East Asian pond culture, valued for their colour, movement, and calm presence in a garden setting. This guide, compiled with the assistance of artificial intelligence, covers the practical aspects of keeping koi: choosing and preparing a suitable pond, understanding water quality, selecting healthy fish, and providing proper nutrition. You will also find clear information on breeding basics, recognising common health problems, and managing your pond through the changing seasons. Whether you are new to koi keeping or looking to build on existing experience, this book offers a straightforward overview of what you need to know to give your fish a healthy and stable environment. Koi are ornamental carp with a long history in East Asian pond culture, valued for their colour, movement, and calm presence in a garden setting. This guide, compiled with the assistance of artificial intelligence, covers the practical aspects of keeping koi: choosing and preparing a suitable pond, understanding water quality, selecting healthy fish, and providing proper nutrition. You will also find clear information on breeding basics, recognising common health problems, and managing your pond through the changing seasons. Whether you are new to koi keeping or looking to build on existing experience, this book offers a straightforward overview of what you need to know to give your fish a healthy and stable environment.