Greens Leader Bob Brown has called on the state government to release all details of its studies into eucalypt-derived pathogens in Tasmanian water catchments.

Responding to statements by Tasmanian director of public health Roscoe Taylor that while no traces were found in Georges river, eucalypt derived material was found in the Douglas river catchment Senator Brown called for details of what eucalyptus toxins were tested to be released.

"The clear implication is that the health authorities know what the toxins from eucalyptus nitens are and inferring that this is not turning up in their testing," said Senator Brown.

"That's new. Let's hear the details," Senator Brown said.