Slow down fellas… It ain’t no New Zealand fish. The sale of any trout in New Zealand is illegal, hence why there is no trout farming here, in fact, that is illegal too. This is one of the ways we protect our precious wild fish from the diseases and genetic deprivation which can often result from farm escapees.
We have farmed salmon here which would fit your description.
Sea Trout are common in some areas, primarily the far south and provide great sport, but there is no lively trade, unless it’s a black market one.
Instances have occurred of illegal taking of wild trout and them being exported and labelled as NZ fish over seas in the past. I strongly encourage you folks to check with your restaurants and make them realise these facts about our trout because it boils it down to one of two options.
1) They are participating, albeit unwittingly) in the illegal black-marketing of our sports-fish
2) Someone is lying about what’s going on the menu.
You can judge a man by the size of things which annoy him.