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We observed that there were more of them in the heated parts of the river.

Yes, like the brown trout, the rainbows in the warmer water are longer, have two annual growth periods rather than one, and have a similar diet. However, unlike the browns, the rainbow trout reproduce successfully in the warm sections of the river and have even changed their annual spawning time from spring to fall.

Isn’t that odd, Dr. Farnheid?

Not when you consider the seasonal shifts in water temperature. At what time of year do you think the river is coolest?

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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q: Can rainbow trout reproduce in the warmer sections of the river?