Calendar An icon of a desk calendar. Cancel An icon of a circle with a diagonal line across. Caret An icon of a block arrow pointing to the right. Email An icon of a paper envelope. Facebook An icon of the Facebook "f" mark. Google An icon of the Google "G" mark. Linked In An icon of the Linked In "in" mark. Logout An icon representing logout. Profile An icon that resembles human head and shoulders. Telephone An icon of a traditional telephone receiver. Tick An icon of a tick mark. Is Public An icon of a human eye and eyelashes. Is Not Public An icon of a human eye and eyelashes with a diagonal line through it. Pause Icon A two-lined pause icon for stopping interactions. Quote Mark A opening quote mark. Quote Mark A closing quote mark. Arrow An icon of an arrow. Folder An icon of a paper folder. Breaking An icon of an exclamation mark on a circular background. Camera An icon of a digital camera. Caret An icon of a caret arrow. Clock An icon of a clock face. Close An icon of the an X shape. Close Icon An icon used to represent where to interact to collapse or dismiss a component Comment An icon of a speech bubble. Comments An icon of a speech bubble, denoting user comments. Comments An icon of a speech bubble, denoting user comments. Ellipsis An icon of 3 horizontal dots. Envelope An icon of a paper envelope. Facebook An icon of a facebook f logo. Camera An icon of a digital camera. Home An icon of a house. Instagram An icon of the Instagram logo. LinkedIn An icon of the LinkedIn logo. Magnifying Glass An icon of a magnifying glass. Search Icon A magnifying glass icon that is used to represent the function of searching. Menu An icon of 3 horizontal lines. Hamburger Menu Icon An icon used to represent a collapsed menu. Next An icon of an arrow pointing to the right. Notice An explanation mark centred inside a circle. Previous An icon of an arrow pointing to the left. Rating An icon of a star. Tag An icon of a tag. Twitter An icon of the Twitter logo. Video Camera An icon of a video camera shape. Speech Bubble Icon A icon displaying a speech bubble WhatsApp An icon of the WhatsApp logo. Information An icon of an information logo. Plus A mathematical 'plus' symbol. Duration An icon indicating Time. Success Tick An icon of a green tick. Success Tick Timeout An icon of a greyed out success tick. Loading Spinner An icon of a loading spinner. Facebook Messenger An icon of the facebook messenger app logo. Facebook An icon of a facebook f logo. Facebook Messenger An icon of the Twitter app logo. LinkedIn An icon of the LinkedIn logo. WhatsApp Messenger An icon of the Whatsapp messenger app logo. Email An icon of an mail envelope. Copy link A decentered black square over a white square.

Nature Watch: Young salmon embark upon journey into the unknown

Richard Harrow of FRT

Each spring in rivers across Scotland something remarkable happens – a miraculous transformation that prepares young salmon for their epic migration to rich feeding grounds in our cold northern seas.

After spending two or three years in rivers, young salmon, or parr as they are known, turn silvery and turn into smolts (about 12-14cm long), and quickly drop downstream into the sea to begin their marine stage.

The timing of the annual smolt run is summed-up by the couplet:

‘The first spate in May takes the smolts away’.

Amazing

When fly-fishing for trout, I occasionally catch smolts on my home river, and I am always in awe at the iridescent silvery beauty of their glistening flanks.

Smolt

It never ceases to amaze me how such a small and fragile fish can endure the harshness of the north Atlantic on storm-tossed feeding grounds in the seas off the Faroes, Iceland and Greenland, and perhaps even as far away as Baffin Island in Canada.

With my heart heavy with emotion, I carefully release the smolt back into the copper-burnished water of the river, speeding it on its way with a silent prayer of hope that it will survive to return to its home river one day to spawn as a mature adult.

First-hand viewing

Recently, I was thrilled to be invited by the Forth Rivers Trust (FRT) to see at first-hand a smolt trap on the Keltie Water, a tributary of the River Teith in Stirlingshire.

Smolt trapping is an effective fisheries management tool and is carried out regularly by many fisheries trusts.

River managers need to understand when the smolt run happens, how old the parr are when they turn into smolts and how productive spawning tributaries are.

Richard Harrow and Will Johnston by smolt trap

Accompanied by Will Johnston and Richard Harrow of FRT, we carefully descended a steep part of bank to inspect the trap.

Rivers are fickle, however, and this time around the trap was empty.

But no matter, for it gave Will and Richard the opportunity to clean the trap of leaves and other debris in preparation for being set again.

The trap is a fine mesh cage, with outwardly spreading wings on either side, which funnel the smolts into the narrow trap entrance, working in much the same way as a lobster creel, but without the bait.

Once examined, the smolts are released unharmed back into the river to continue their miraculous journey.

Cleaning the smolt trap

This is the second year that FRT has engaged in smolt trapping on the Keltie Water and Dr Jo Girvan of FRT tells me that the long-term aim is to have a series of annual datasets which helps enhance our understanding of salmon ecology in the Teith catchment.

The more we know about salmon, the better placed we are to protect them and put in place essential conservation strategies.

Sea trout smolts are regularly caught in the trap, and river lampreys also occasionally turn-up.

Lampreys are among the most primitive vertebrates alive today; eel-like slivers of mystery, which are the very essence of why our rivers are such special places.

Smolt