Since the trout is largely a fish that lives on shoreline, or coastal, and in addition, migrating to streams, it is popular with anglers.
A trout can be around 110 cm and barely reaches 20 kilos. The pelvic variant, as well as trout that live in nutrient-poor waters such as small mountain ponds, are small adults.
In the sea and in large lakes, the trout are silver-shiny on the sides, with dark green, gray-blue or black back. Compared to the salmon, it has significantly more dots in black on the silvery sides and a lot of them are found below the side line. Lake and brook populations usually wear an amber, yellow or brown base and dots in different shades of red, black and white.
The trout's tail coil is wide and the tail fin is straighter at the trailing edge, while the salmon's tail coil is narrow and the tail fin broad with slightly incised, slightly V-shaped trailing edge. If you draw a straight line from the eye down to the mouth, the trout's mouth pores reach behind the eye, while salmon's usually do not. The trout are grown and released into our waters. On cultured fish, the fatty fin is often cut off and the dorsal fin very often has a crack on the front of the dorsal fin after a fungal disease that attacks fish in cultures.
Ecology
living Environment
The trout can thus both live permanently in fresh water and use the sea as a growing area before returning to the birth water for play. When compared to salmon, the trout move much closer to the beach. The trout has also been affected by the hydropower expansion. But the trout can also play in surprisingly small streams and are scattered throughout the country, including the coasts.The trout do not die as frequently in connection with the game as the salmon, but often return annually to their play areas for many years.
Play and growth
The hike to streams, streams and larger rivers, even to downstream rivers in lake systems, takes place summer or autumn. The game itself usually takes place from October to January, in some streams even in February. The trout, like salmon, become playful and get a brownish, gold or grayish color, black and red dots with a bright stripe all around. The males develop a large jaw hook.A female may be surrounded by several males who want to play, but mainly the game happens in pairs. The female makes a new play pit in the gravel bed for each new act. The game can last for 2-3 weeks. A female can lay around 10,000 eggs that hatch in the spring.
The trout grows up in their birth water staring, before they migrate out after 1-5 years. Angling migration also occurs, including on Gotland, where many of the small watercourses dry out, forcing the trout to get out into the brackish waters of the Baltic to survive.
In the sea, or the large lake (for the lake trout), they increase the growth rate well and can be around 70 cm in three years. Some trout play on the rake for several years, others skip the game for one or a couple of years. Maximum age around 15 years.
Food
Trout eats insects, crustaceans and molluscs. As smolt, the menu is dried out with small fish. In the sea, fish, such as herring / herring, sushi, seaweed and spears are on the menu. But also moths, shrimp, brush worms and other small animals are important sources of nutrition. The menu also mixes in fresh water. In small, nutrient-poor waterways, insects are often the basic food, which explains that the trout do not become as large as the relatives in the sea or the large lake.Relationship
FamilySalmonidae (salmonids)
Genus
Salmo
Similar species
Salmon, rainbow, larynx trout.
