Unlike some types of salmon that may die after spawning, the steelhead lives to return and spawn year after year guided by their uncanny senses. Their particular place of birth is imprinted in their bodies and nothing short of death can keep them from returning to it. Their senses, especially their senses of taste and smell and extra senses located in lateral lines, lines that run along both sides of their body from the tail to the head, guide them to their traditional place for spawning. Beneath their lateral lines are a system of pores, canals and sense organs linked to the brain. With their lateral lines, fish are able to detect unseen enemies or prey. They sense currents, obstacles with the lateral line's sixth sense, in an intermediate area between hearing and touch; it allows the fish to remember low frequency vibrations and pressure waves built up as the fish passes rocks or other fish. Experiments have shown that fish use their keen sense of smell to help them home in on their traditional spawning grounds imprinted in their memories.
Great strength, speed and endurance make trout and their close relatives the salmon, the champions of fish. Their strength propels them over dams and through swift currents.
Read more about fish and other denizens of the deep in my book, The Dynamic Great Lakes available on the Kindle reader, and as a paperback on Amazon.com, bn.com, Schuler Books and Music and many other fine bookstores.