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UK +44 7734 810 706  

USA TOLL FREE 800-972-0408

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Identify the various phases of the Atlantic Salmon life cycle

River Tay, Salmon, Catch and release, Atlantic Salmon, Spey Casting
Atlantic Salmon River Tay Dunkeld

February 8, 2023 //  by Stewart Collingswood

Atlantic salmon can be referred to as Rawners, Baggots, Kelts, Springers, and Grilse. Hopefully, this article will help you understand the various terms used to describe their remarkable life cycle.

Understanding the life cycle of the salmon, will help you identify these various stages.

River Whiteadder, Lodge, salmon, trout, grayling, Fishing guide, scotland, borders, gift vouchers
A maturing hen fish ready to spawn

The salmon is born in the river and spend the fist few year of its life as a salmon parr. Basically, salmon parr behave, and feed like trout and feed on fly life, shrimp, larvae and other insects. As they gain weight in the second year and approach early spring, a chemical change occurs in their scales, and they start to turn silver.

This change is in anticipation of migration to the ocean. From this point forward, the sound salmon will feed and gain weight in the ocean. Afterwards, and depending on the term spent at sea, the salmon will return to the river to spawn, as with a Grilse or a mature salmon.

How to indentify a Grilse – Atlantic Salmon

Firstly, a Grilse is a salmon that has spent one winter at sea feeding and return to the freshwater river to spawn. They usually enter the rivers in early summer, between July and Mid August. However, this can vary from region to region and also river to river.

salmon, Atlantic salmon, fishing, speycasting, catch and release, River Tay, Salmon,
A bright clean Grilse released on the Tay

Usually the summer and late summer catch returns are bolstered by the arrival of these summer Grilse. Good number of these salmon enter the river systems and can make for some great sport. Remarkably, they fight very hard, often we have hooked and landed smaller fish, between 6-8lb, which seemed much bigger.

Typically these Grilse can range in weight from 2lb to 7lb, depending on the quality of their ocean diet.

Grilse, River Tay, Salmon, Salmon Fishing, Fly Fishing, Scotland
A typical River Tay Grilse

Springer – Spring Salmon

Arguably, the Springer is the ultimate prize for a salmon angler. Firstly, they are bright, clean and silver. Secondly, they are in peak condition and indeed, if you were to imagine the perfect salmon, a Springer fits the mould.

Generally Springers will enter the Scottish rivers from January to May. Understandably, catching a Springer in Scotland, is on every serious salmon anglers bucket list.

Springer, Atlantic Salmon, Fly Fishing, Salmon fishing, River Tay, River Tweed, Spey Casting
A perfect Scottish Springer for this Alba guest

Springers are salmon that have spent 2 or 3 winters at sea, before returning to the river to spawn. Commonly these are know as Multi-Sea-Wintered Fish.

Autumn Salmon

Autumn salmon can look completely different in many ways to a fresh silver salmon. Some of these Autumn fish have been in freshwater for months, and therefore take on the colour of their environment. In addition a chemical change occurs in salmon prior to spawning.

River Tweed, Big Salmon, Cock fish, Autumn colours, Spawning, Catch and Release
A big male Cock Salmon in full spawning colours River Tweed

Firstly male salmon, develop a Kype, as you will see in the image above. Secondly this is a sex like characteristic, causing a curvature of the lower jaw in cock fish. Secondly, the salmon in the photo above, has also developed spawning colouration. Also, in Scotland, we call these salmon, “Tartan Fish” and this fish is almost in full breeding dress.

Atlantic salmon, Kelt, Springer, Grilse, Salmon fishing, Identification,
The various stages of the Atlantic Salmon

How to identify a Kelt – Atlantic Salmon

A kelt is term given to a salmon after it has spawned. Usually they display a distended vent. In addition they are much thinner than a fresh fish, having used their reserve in the process of spawning.

In addition, you are likely to find gill maggots in Atlantic Salmon kelts. Of course, these fish must be returned to the river safely and quickly, so they can return to the ocean, to regenerate, repair and gain weight.

Finally, a returned 2 sea winter kelt can return to the river again in the future as a real trophy salmon.

Atlantic salmon, Kelt, Salmon fishing, well mended
A Kelt from the River Tweed

What is a Baggot?

A Baggot is a female Atlantic salmon who has failed to spawn. Sometimes, a salmon who has also started but not finished the spawning process. Typically, they can be identified by a soft under carriage, a darker head and enlarged anal fin.

What is a Rawner?

A Rawner is a male Atlantic Salmon that has failed to spawn.

Atlantic Salmon Parr

The Salmon Parr lives, feeds and grows in freshwater rivers for a couple of years. Naturally, its prime concern is in escaping predation, from Trout, Goosanders, Cormorants, Herons, and Kingfishers. Hence the camouflage marking it adopts.

Lastly, salmon parr do look similar to trout parr, and the two often get misidentified. Uniquely, the Parr, has a longer shape to its body, no orange on its adipose fin, a sharper snout, smaller mouth and a more pronounced fork in the tail. Thanks to Lizzie Harper for the two beautiful illustrations below.

Atlantic salmon, Parr
Atlantic Salmon Parr © Lizzie Harper

Smolt – Young Salmon

To begin with, after a few years feeding in the river, the your parr goes through something akin to puberty and a massive physical metamorphosis. Secondly, this change is preparing it for the migration to sea. This smolt migration happens in early spring and with good river levels, the smolts can get safely to the ocean and escape the mouths of hungry predators.

There’s a remarkable chemical change which occurs. Guanine crystals form a layer in the skin, and the scales change to a silver colour. Brown trout fisherman know only too well, that there are some very big predatory trout caught during the smolt migration.

Atlantic Salmon, Smolt
The Atlantic Salmon Smolt © Lizzie Harper

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