Iran Trout

Trout Trout is a freshwater fish. Trout belongs to the subfamily Salmoninae of the family Salmonidae. Trout and salmon are closely related. There are 3 types of trouts: Lake trout, brook trout, and brown trout. Trout has a compact body and a larger tail than salmon. There are 14 and 19 scales between the fat fin and lateral line. Trout has 2 to 5 sword-shaped spines in the first bow of the gill that is formed like a button at the bottom. The caudal stem of trout is high and the outer part of the caudal fin is almost flat. Maximum size of trout is 140 cm and weighs almost 5 kg. Most trout such as lake trout live only in freshwater lakes and rivers. Other trouts such as rainbow trout live at the sea for 2 to 3 years before returning to freshwater to lay eggs. The egg-laying season for trout is between February and March. Trout lay around 10000 eggs which is estimated at almost 1500 eggs per kg and weight of the female trout. Most adult male and female trouts survive after spawning and return to the river again for spawning. Iran Trout larvae are distinguished by dark stripes with many red dots. Baby trout live in freshwater for 1 to 5 years, up to 5 years in northern Europe. When they reach a length of 15-25 cm, they enter the water and spend most of their time on the beach. Iran Rainbow Trout Rainbow trout has a rainbow-shaped wide stripe on each side of the body. Spawning starts in late winter and lasts until late spring and is around 1000 to 5000. Trout has become the go-to cold water fish for farming in most parts of the world. What sets your apart from other fish is how well it adapts to dense farming. On the other hand, rainbow trout is not a picky eater and grows up fast. Iranian Caspian Brown Trout Caspian brown trout is silver and has star-shaped spots on the sides. There are 11 to 19 scales between the fat fin and lateral line. The average brown trout is 77 cm long and 5 kg. Brown trout lives in the northern coasts of Iran. Brown trout enters the Iran Caspian sea in late autumn and early winter to lay eggs. Iranian Brown trout eats insect larvae, crayfish, and other fish. Iran Brown trout is among the most precious fish in the Caspian sea. Multiple factors put fish species in danger of extinction: • Excessive fishing • Blockage of migration routes due to construction of bridges • Not considering migration routes for fish • Polluted waters North Lake Trout There are two types of trout. North lake trout, also known as the migrating trout. They migrate from freshwater to open waters but return to the lake for reproduction. South lake trout are smaller than the north lake trouts and live their entire lives in mountain lakes. The most prominent feature of trout is their fat fin. Trout has a spindle-shaped body that helps it break through the water with pressure and speed of seventy kilometers per hour. Trout jaw consists of 2 jaws that open in 2 stages so that the trout can swallow larger prey. Although trout is carnivorous, it has a shorter stomach compared to other carnivorous fish. To make up for that, trout has worm-like appendages around the gut that secrets enzymes which help them with digestion. There is a row of sharp teeth on the upper and lower jaw of trout. These teeth turn into hard and sharp villi. Trout has several rows of longer teeth on its tongue. Trout is a well-oxygenated fish that can survive in saltwater. Trout has strong eyesight. Trout can see up to 8 meters from a depth of 50 cm despite the bubbling water. So, one needs to consider a distance of at least 2 meters from the water’s edge to catch trout. Unlike other fish newborns, trout newborns have dark stripes on their bodies which become lighter at puberty and disappear gradually. These stripes help trout with camouflage. Normally, we might think the trout’s nose consists of those two holes with caps on them, but the truth is there are very small holes in trout’s head that help them with smelling although the smelling mechanism of trout is very complicated. Trout can smell any creature under the water, despite the massive flow of water. Although the odor is slowly released in cold environments but still trout can capture any odor and increase contact with olfactory nerves, thanks to the multiple channels in each nostril. Distance meters, or the many small villi on the jaws of salmonids control the fish like the whiskers of a cat does. The difference is that these meters determine the suction power by the exact distance with the prey and then direct a whirlpool of water towards the prey by adjusting that suction power. They will also stabilize the distance of trout from the bottom so that they don’t crash with the rocks and the sea beds invisible in rapid flood currents.