Trout is the common name for a number of species of freshwater fish.
They are native to the Northern Hemisphere but have been widely introduced to other areas.
Trout are distributed naturally throughout North America, northern Asia and Europe. Several species of trout were introduced to Australia and New Zealand by amateur fishing enthusiasts in the 19th century, effectively displacing and endangering several upland native fish species.
Most trout such as lake trout live in freshwater lakes, rivers and streams exclusively, while there are others such as the rainbow trout which as such live out their lives in fresh water, or spend two or three years at sea before returning to fresh water to spawn, being called a steelhead (a habit more typical of salmon).
Trout usually live in cool water about 10–16 °C (50–60 °F), often among submerged objects or in riffles and deep pools.
Trout that live in different environments can have dramatically different colorations and patterns.
Mostly, these colors and patterns form as camouflage, based on the surroundings, and will change as the fish moves to different habitats.
Lake trout inhabit many of the larger lakes in North America, and live much longer than rainbow trout, which have an average maximum lifespan of 7 years. Lake trout can live many decades, and can grow to more than 30 kilograms (66 lb).
Trout eat a host of aquatic insects, terrestrial insects, other fish, crustaceans, leeches, worms, and other foods. The food items that are most important to trout and fly fishers are the aquatic insects that spend most of their life cycles underwater in rivers, streams, and stillwaters.
Trout spawn between fall and spring and bury their eggs in a gravel nest scooped out by the female on a streambed. The few forms that migrate to sea between spawnings return to streams at this time. The eggs take two to three months to hatch, and the newly hatched trout, or fry, become known as fingerlings when they leave the nest and begin feeding on plankton.
Trout are valued highly both for commercial fisheries and for sport.
While trout can be caught with a normal rod and reel, fly fishing is a distinctive method developed primarily for trout, and now extended to other species. Understanding how moving water shapes the stream channel makes it easier to find trout. In most streams, the current creates a riffle-run-pool pattern that repeats itself over and over.
Trouts are classified as oily fish. They have oil in their tissues and in the belly cavity around the gut. Their fillets contain up to 30% oil, although this figure varies both within and between species.
Trout has all essential minerals in varying amounts. The cooked fish provides 3 percent of the RDI for calcium, 7 percent for iron and copper, 4 percent for magnesium and zinc, 19 percent for phosphorous, 6 percent for potassium, 2 percent for sodium, 34 percent for manganese and 14 percent for selenium. Minerals play different roles to help your various systems to function. Potassium, for example, is an electrolyte. The nutrient powers your tissues, cells and organs with the electrical signals it transmits.
Trout is also a good source of vitamins including vitamin B1, vitamin B6 and potassium and a rich or high source of protein, omega-3 fatty acids, vitamin D, vitamin B3, vitamin B12.
A nutrient-dense food, trout offers a variety of health benefits and is low in mercury, making it a safe addition to your diet.
Trout is one of the healthiest fish you can include in your diet. It is a nutrient-dense food that offers a variety of health benefits, especially for the heart and brain.