Blue danio with a 6.5 – 7.0 pH, a water hardness of 8 – 12 dGH, and a temperature range of 73 – 77 °F (23–25 °C). Blue danios are egg-scatterers that spawn over coarse gravel beds. They will typically spawn at the first light of day. The eggs will hatch in about 36 hours. The taxonomic name honors A.F.G. Kerr, who collected the first specimen on Ko Yao Yai in 1929. Blue danio The blue danio or Kerr's danio,Turquoise danio ("Danio kerri") is a tropical fish belonging to the genus "Danio" in family Cyprinidae. The blue danio is found on the
Jeanne Coroller-Danio Jeanne Coroller-Danio Jeanne Coroller-Danio (25 May 1892 in Mordelles – 13 July 1944 in Penguily) was a Breton nationalist and writer. She is also known as Jeanne Coroller (her maiden name) and Jeanne Chassin du Guerny (her married name). Her best-known pen-name was Danio, but she published her work under various pseudonyms: J.C. Danio, Jeanne de Coatgourc'han, Gilles Gautrel and Gilesse Penguilly. She was the daughter of Breton-language writer Eugene Coroller (1857–1923), friend of Theodore Hersart of Villemarqué. Born in Mordelles in 1892, she married Rene Chassin du Guerny in 1924, with whom she had six children. A traditionalist Catholic