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Rainbow Trout Life Cycle: From Egg to Introduction Rainbow">Adult Introduction Rainbow trout, scientifically known as Oncorhynchus mykiss, are one of the most popular freshwater game fish species in the world. Native to North America, they have been introduced to various regions around the globe due to their delicious taste and sporting qualities. In this article, we will dive into the fascinating life cycle of rainbow trout, exploring each stage in detail. Egg Stage In the first stage of their life cycle, rainbow trout begin as eggs laid by adult females in gravel nests called redds. These redds are usually located in clean, fast-moving streams or rivers with suitable gravel substrate for egg incubation. The eggs are typically orange or yellowish and provide protection to the developing embryos. Alevin Stage After an incubation period of several weeks, the eggs hatch into alevins. Alevins have a yolk sac attached to their bellies, which provides them with essential nutrients ...