Swat Trout fish is the largest industry of its kind in Pakistan producing both rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta) in the valley. The natural habitat of swat trout is the clean and freshwater of the Swat River where glaciers are melting and streaming into it.
Trout Fish Farms in Swat
Although Swat River is the main source of trout, due to its popularity and demand in Pakistan and abroad, trout are also raised in farms and hatches. The new trout fish farms in swat use hatcheries to cultivate trout to sell for food, thus preserving the population of trout fish in the river.
The rainbow trout (Oncorhynchus mykiss) found swat river are species of salmonid. An adult freshwater stream rainbow trout fish averages between 1 and 5 lb (0.5 and 2.3 kg), while lake-dwelling and anadromous forms may reach 20 lb (9 kg).
Rainbow trout generally spawn in early to late spring when the water temperature of the swat river reaches at least 42 to 44 °F (6 to 7 °C). The maximum recorded lifespan for a rainbow trout is 11 years.
Freshwater resident rainbow trout usually inhabit and spawn in small to moderately large, well-oxygenated, shallow rivers with gravel bottoms.
Spawning sites are usually a bed of fine gravel in a riffle above a pool. A female trout clears a redd in the gravel by turning on her side and beating her tail up and down. Female rainbow trout usually produce 2000 to 3000 4-to-5-millimeter (0.16 to 0.20 in) eggs per kilogram of weight.
The brown trout (Salmo trutta) is a European species of salmonid fish that was brought to swat from the United Kingdom. It includes both purely freshwater populations, referred to as the riverine ecotype, Salmo trutta morpha fario, and a lacustrine ecotype, S. trutta morpha lacustris, also called the lake trout.
The brown trout is a medium-sized fish, growing to 20 kg (44 lb) or more and a length of about 100 cm (39 in) in some localities, although in many smaller rivers, a mature weight of 1.0 kg (2.2 lb) or less is common. A typical female produces about 2,000 eggs per kg (900 eggs per lb) of body weight at spawning. Brown trout can live 20 years.