The video shows a large group of small black fish swimming in a body of water. The water is clear, and the fish are seen swimming around green plants and rocks. The fish are moving in different directions, and some are swimming near the surface while others are deeper in the water. The plants are swaying gently in the water, and the rocks are visible on the bottom of the water body. The fish appear to be in a natural habitat, and there is no human interference visible in the video.