Napier angler Gary Kemsley, a media contributor on fishing issues, disputes the need for the trout restocking gap year.
"The reality is that if there are no releases there are no trout in the future as there are no spawning waters on the lake," he said.
"The trout have a lifespan of three to five years. After that time they will have all died out."
Rumours at the lake have surfaced in recent weeks about the possibility of a clandestine release, although Friedlander said he would be "very surprised" if the rumours were true.
"Fish and Game haven't conducted any releases and it would take substantial resources to raise trout as Eastern Fish and Game does at its hatchery."
Department of Conservation senior ranger Chris Wootton said DoC is not aware of any clandestine release of trout into Lake Tutira.
"DOC, along with MPI, is concerned about New Zealand's biosecurity, especially at Lake Tutira, which has a bad history of invasive species such as aquatic weeds, including hydrilla," he said.