An inquiry has begun into the deaths of dozens of salmon and trout in one of Scotland’s most famous fishing rivers.

It is believed more than 50 adult fish have been found dead over an almost 18-mile (29km) stretch of the Spey since Saturday 9 September.

Spey Fishery Board said pollution could potentially have killed the fish.

The Scottish Environment Protection Agency (Sepa) said it had found no evidence of recent pollution, but was monitoring the situation.

Samples have been taken from water and dead fish at sites along the river between Grantown-on-Spey in the Highlands and Knockando in Moray.

The Scottish government’s Fish Health Inspectorate said the samples would be analysed in due course.