KoiKnife

KoiKnife is the Swiss Army Knife of koi knowledge: everything a koi keeper, buyer or admirer needs, in one beautifully illustrated app. Presented with B&M Aquatics of Hamburg, New Jersey, family owned since 2003. IDENTIFY • 33 koi varieties, from the Gosanke (Kohaku, Taisho Sanke, Showa) to Asagi, Shusui, Ogon, Kujaku, Chagoi, Ochiba, Goromo, Tancho, Doitsu, Ginrin and butterfly koi • Large photographs, kanji names, colour swatches and rarity • "Often confused with" links that teach the real differences • Search and filter by variety group • Save favourites to My Koi PRICES • Price bands from Pond grade and Hobbyist to Japanese import, Breeder-attributed and Show quality, at every size • A size calculator: price grows with the square of length • Why two koi the same size cost wildly different money HISTORY • Ten researched chapters on the real story of nishikigoi, from Chinese paddy carp and Niigata's snow country to the 1914 Tokyo exposition, the ¥203 million S Legend and the 2004 earthquake • Myths busted, facts sourced • A gallery of woodblock prints by Hokusai, Hiroshige, Kuniyoshi and more POND CARE & SUPPLIES • Feeding by water temperature (°F / °C) • The pond year, season by season • Water tests explained: ammonia, nitrite, nitrate, pH, KH • The gear every pond needs, with practical tips • Pond FAQ: green water, winter, UV, stocking EXTRAS • Name That Koi: a photo quiz where the wrong answers are the real lookalikes • Koi of the Day • A living koi pond to feed and play with No account, no ads, no tracking. Everything works offline.