Anglers will gather at the River Tay on Monday for the annual opening of the salmon fishing season.
The event will be marked by a ceremony at Meikleour in Perthshire, with the first cast of the season undertaken by Marina Gibson, a UK and international fishing guide.
The Tay District Salmon Fisheries Board said the opening comes at a time of change for fish runs into the river.
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The board, which is the body responsible for the protection, preservation and development of salmon and sea trout in the Tay system, announced new restrictions as a result of a decline in stocks.
The river's catch, mostly consisting of grilse, salmon returning to fresh water after a winter at sea, has fallen considerably.
Iain McLaren, interim chairman of the board said: "There is little doubt that we are experiencing a period of major changes in the Tay's salmon runs.
"It is the fisheries board's responsibility to act whenever necessary to protect and conserve our valuable wild salmon stocks."
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Measures include restrictions of the number of fish that anglers may kill in summer and early autumn, with no fish kept at all in spring.