Rainbow Trout Research Paper

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Rainbow trout, Oncorhynchus mykiss Introduction: The rainbow trout (Oncorhynchus mykiss) is a species of salmonids native to cold-water tributaries of the Pacific Ocean in Asia and North America. In 1989, the species name Oncorhynchus mykiss became the scientific name of the rainbow trout while the anadromous forms of the coastal rainbow trout (Oncorhynchus mykiss irideus) or redband trout (Oncorhynchus mykiss gairdneri) are commonly known as steelhead. Rainbow trout is a hardy fish, fast growing, tolerant to a wide range of environments and handling. The species can withstand vast ranges of temperature variation (0-27 °C). However, the optimum water temperature for their culture is below 21 °C. Typically, the lifespan of rainbow trout is…show more content…
Trout being a cold water fish, temperature plays a fundamental role in their distribution. This popular species has been widely introduced into suitable lacustrine and riverine environments throughout the United States and on every continent except Antarctica. Many of these introductions have established wild, self-sustaining populations wherever, temperature suits the survival and reproduction of the species. Description: Rainbow trout has an elongate, fusiform salmon-like body shape. Rainbow trout derive their name from their beautiful, multi-hued coloration. Generally, their bodies are blue to olive green or yellowish, shading to silvery white on the underside, with heavy black spots covering back, sides, head and fins. Rainbow trout adults are distinguished by a broad reddish band along the lateral line extending from gills to the tail, which is most pronounced in breeding males. They can reach up to a meter in length, but are usually much smaller. The weight average of rainbow trout is about 3kg while individuals of rainbow trout can reach much heavier…show more content…
They may also consume decomposing flesh from carcasses of other fish. Reproduction and life history: Fresh resident rainbow trout usually inhabit well oxygenated, shallow rivers with gravel bottoms. They spawn when water temperatures reach at least 6 to 7 °C. When spawning, a female digs out a depression in the gravel bed in which she deposits her eggs which are fertilized by the male. Then after, the female covers the eggs with the displaced gravel. A female rainbow trout usually produce 2000 to 3000 of relatively large eggs with 4-5 mm in diameter per kilogram of her weight. The eggs usually hatch into sac fry or “alevin” in about four to seven weeks depending on some environmental conditions especially temperature. The yolk sac is completely consumed in about two weeks and fry commence feeding mainly on

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