* Environment: Wild rainbow trout typically live shorter lives than those raised in hatcheries.
* Predation: Predators like larger fish, birds, and mammals can significantly impact lifespan.
* Availability of food and water quality: Abundant food sources and clean water contribute to longer lifespans.
* Fishing pressure: Heavy fishing pressure can shorten lifespans.
Generally, here are some lifespan estimates:
* Wild rainbow trout: 3-5 years
* Hatchery-raised rainbow trout: 5-10 years
It's important to note that some individual rainbow trout can live much longer than these estimates. There have been documented cases of wild rainbow trout exceeding 10 years of age.