Salmon are being fed with the assistance of the legs of locally-culled deer to assist enhance their survival charges.
The scheme is being trialled on the River Muick, within the Grampian Mountains of Aberdeenshire.
Legs from the deer are being positioned in clusters at varied factors alongside the river.
Previously, grownup salmon would die and vitamins from their carcasses would assist enhance insect populations, offering meals for youthful fish.
Nonetheless, with the variety of grownup salmon returning to the river from the ocean plummeting, there’s now a shortage of meals within the water.
It’s estimated that for each 100 salmon which migrate from rivers, 5 return, whereas 40 to 50 years in the past round 40 would have made it again.
The River Dee’s fisheries board and belief have partnered with the James Hutton Institute to check the influence of the initiative.
Ross Macdonald, fisheries growth officer, mentioned: “In instances previous when there have been 1000’s and 1000’s of salmon within the river, there have been heaps and plenty of carcasses which would supply vitamins to the aquatic surroundings.
“Over time, the variety of grownup salmon returning to Scottish rivers has dropped fairly markedly, which means the variety of carcasses are declining as effectively.
“We’ve got received bundles of deer legs positioned in numerous clusters throughout the river, in numerous volumes, and plan to observe the influence.”
The organisation will monitor the variations in numbers of younger salmon through electro-fishing, a permitted course of the place a lightweight present is used to stun the fish to allow them to be counted.
Lorraine Hawkins, river director for the board, mentioned if the scheme does have an effect it ought to develop into obvious “fairly shortly”.
“The concept of nutrient addition is commonplace in elements of North America,” she mentioned.
“There was an identical challenge trialled within the River Conon in Ross-shire just a few years in the past however that concerned fish pellets.
“We’re doing a little bit of that however utilizing deer legs from the native estates, so it’s additionally a extra sustainable approach of doing it.”
Final summer season anglers warned the heatwave threatened to plunge the business into disaster, with water ranges in among the hottest salmon rivers falling to drastically low ranges.
The Scottish Authorities imposed a ban on salmon-netting since 2016 to guard dwindling shares. The apply entails fishermen utilizing nets to reap wild salmon as they migrate between the ocean and Scotland’s world-renowned rivers.