Tana salmon
Is an Atlantic salmon that makes grazing migrations in the Atlantic Ocean
Tana salmon
The Tana salmon is a collective term for all 30 different genetic populations of Atlantic salmon that spawn in the main river and tributaries of the Tana River. The Tana salmon spawn in the fall and the roe remains under the ice during the winter before hatching in the spring in March/April.
For the first time after hatching, they live off the yolk sac on their stomachs. Hidden in the river gravel, they grow larger. Eventually, the fry must emerge from the gravel in search of food.
At two to five years of age, the salmon fry leave the river to grow up in the rich food bowl of the North Atlantic. They can migrate thousands of kilometers over several years. When the salmon is ready to spawn, they return to the river where they were born.
The Atlantic salmon is known to be able to carry out several grazing migrations/sea winters in the Atlantic Ocean after spawning.
Biodiversity in Tana
The Tana River system, with its main river and tributaries, contains a great deal of biodiversity.
14 different fish species have been recorded in the watercourse. In addition to the great diversity of different genetic families of Atlantic salmon, there are also whitefish, grayling, sea trout, sea char, perch, pike, roach, tench, eel, short-spined stingray, three-spined stingray, flounder, harbor mackerel, perch, white-finned sculpin and river mussel. Humpback salmon have also established themselves in the watercourse in recent years.
Major changes are now taking place in the watercourse in several areas. Climate change with increased water temperature and shorter winters is one factor. Another factor is changes in population numbers in the various species. A third factor is changes in the sea with temperature and grazing grounds for the anadromous species.