Aquatic migration sometimes aided by a fabricated ladder

Once upon a time, on a small stream deep in the heart of a forest, a family of salmon was preparing for their annual migration upstream. They had heard about a fantastic waterfall located a few miles ahead, which was the last obstacle they needed to overcome before reaching their breeding grounds. The only problem was that this particular waterfall was incredibly steep and hazardous, making it nearly impossible for the salmon to leap up and over it. Fortunately, a group of industrious beavers had taken up residence nearby and, after witnessing the salmon’s struggles, offered to construct a ladder for them. The salmon were delighted and couldn’t wait to try out their new ladder. They swiftly made their way up the steps, pausing for a moment on each rung to catch their breath and admire the stunning view of the forest that spread out below them. Finally, after what seemed like an eternity, they reached the top of the waterfall and the rest of their journey was smooth sailing. The beavers had not only helped them overcome a significant obstacle but also made their journey safer by creating an aquatic ladder. This annual event became known as the “Salmon Run,” a term used to describe the journey that salmon undertake to reach their breeding grounds. And so, the term “Aquatic migration sometimes aided by a fabricated ladder” became a popular crossword clue, leaving puzzlers scratching their heads until they finally discovered the answer, “Salmon Run.”