"As a result, we have asked DOC not to drop 1080 into or immediately beside rivers and streams.
"The technology to do this is readily available, and is already used in aerial poisoning operations along conservation land boundaries to stop 1080 falling on to neighbouring properties.
"We thought we had reached agreement for this to happen, but DOC now appears reluctant to commit itself to this course of action, and we must now assume it has failed to instruct its helicopter operators dropping the 1080.
"We are especially concerned that DOC is conducting a major 1080 drop in trophy trout waters, such as the Kahurangi National Park, over the opening period of the trout fishing season. These rivers and streams attract local and international anglers who value them highly, yet now face a co-ordinated poisoning operation.
"I expect they will be pretty disgusted if they are showered with 1080 pellets, as has happened in previous years."
Fish & Game did not oppose efforts to save New Zealand's indigenous species, but was seriously worried by DOC's inability to organise a poison drop at a less sensitive time of year.
It was also calling for more research into how susceptible trout were to ingesting 1080, and the health threat posed to humans by eating freshwater fish exposed to 1080.
"What we need is more robust scientific research to be undertaken to establish once and for all what the risk is to humans and freshwater species like trout, and the best way to mitigate that risk," Mr Johnson said.
"That will ensure the long-term safety of all people gathering food from rivers, lakes and streams."