Tokyo police on March 8 arrested five men on suspicion of illegally breeding and selling killifish that were genetically modified to make them “red and shiny.” Genetically modified organisms can ...

In February 1999, the Environment Agency (the present-day Environment Ministry) shocked the nation by designating the all-too-familiar “medaka” killifish as an endangered species. That was exactly a ...

The Environment Ministry announced Friday that nonyl phenol, an organic chemical used in cleaning products, disrupts the endocrine system of "medaka" killifish and causes males to assume female ...