Dictionary of Ichthyology  

fish poison tree = various trees come under this heading as parts are used to poison fish, e.g. Acacia ditricha (family Mimosaceae), the leaves of which are poisonous to fish when rubbed in a bag until a soapy foam comes out (Australia), and various Piscidia species (Leguminosae) such as P. mollis where leaves are used (southwest United States and Mexico).

P. mollis in Arizona-Sonora Desert Museum, 23 April 2006. Photograph by Brian W. Coad

Canadian Museum of Nature
www.briancoad.com