Write a children's poem (self-created)

There is an animal from the ocean whose life is so short, only eight weeks. People say it is a "fish going upstream". Its shape is only a dozen millimeters, but they have created immortal miracles. They are small gobies. The little goby swam to the swift waterfall through hardships. What are they going to do? What's the point of swimming here? Above the waterfall is the Danshui River, and they want to climb it. However, they had to face the last difficulty, climbing the steep and slippery rock wall, and the pouring water slammed into the sea like a rapid shell. If you want to succeed, you must redouble your efforts. That's what the little goby does. They won't give up, they still face difficulties and never back down. They crawled carefully. The rock wall is so high. How can their little bodies climb up? Halfway up the mountain, some small gobies were washed away by the swift and fierce river because of exhaustion, and they were going to die. Their short lives were taken away by the ruthless river. Only a few small gobies can survive and climb to Danshui River. They grow and breed on it, the old goby will die quietly, the younger generation will be washed into the sea, and when they grow up, they will come back here and do the same things as the previous generation. I was inexplicably moved for a moment, because I was moved by the spirit, persistence and valuable responsibility of shrimp and tiger fish.