Fish and Game Otago says it is not concerned at this stage about a decline in the number of salmon being caught in Lake Wanaka.
Both recreational anglers and commercial operators have reported a decline in the number of salmon being caught in the past two years. Otago Fish and Game ranger Cliff Halford said he was aware of reports from local anglers about a lack of salmon but said there was nothing to suggest it was not part of a natural cycle.
Anecdotally, it seemed the number of salmon in the lake had declined in the past two or three years but it was unlikely a permanent trend, he said.
Salmon numbers in both Lake Hawea and Lake Wakatipu were very good, he said.
Lake Wanaka was slightly different from the other two lakes, in that the salmon preferred to live at a lower depths, for some reason.
"It just seems to be something they do for whatever reason and it can sometimes mean they can be hard to find."
At this stage there was no need to be worried, Mr Halford said.
Fish and Game would carrying out surveys of fish numbers in the lake during the summer and would also be talking to local anglers about what they had noticed.
"We will be concentrating efforts and talking to anglers to see where they are fishing."
"Hopefully, they will bring up some salmon and we can look at their condition."
Fish and Cruise Lake Wanaka owner operator Alan Baxter said he had noticed a considerable decline in the number of salmon he was catching.
"I haven’t caught a salmon in ... at least two years whereas in 2004, I caught more 110 in a month and returned 90% of them."
Mr Baxter had his own theory as to why salmon had become more scarce in the past few years.
"My theory is they have left because they can’t stand the lake snow in their gills. Obviously, that’s just my theory but I think there’s a connection."
The decline in the number of salmon caught followed a similar timeline to the spread of lake snow, he said.
Mr Halford said nobody was sure what effect lake snow had on the fish but it was something that needed to be investigated. Other fish, such as rainbow and brown trout, did not seem to be affected, he said.
"We will just try and do a bit of a brief survey about what people fishing on the lake are seeing in terms of lake snow, which hopefully, will give us a bit of a better picture of what is happening."
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Along with the decline of salmon in Lake Wanaka and its tributaries is a definite decline of whitebait migrating in to the rivers . These two issues are likely to be linked as it's well known whitebait are or were a major food source for salmon and trout. Trout luckily have a far more diverse diet. As an angler who has fished the Wanaka area 50 years I have seen the shoals of whitebait almost disappear. Hopefully, it's a normal cycle but it's more likely to be linked to their habitat.