The video shows a blue crayfish in an aquarium. The crayfish is moving around the tank, and the camera follows its movements. The crayfish has a hard exoskeleton with a pattern of spots and stripes. Its long antennae and legs are visible as it moves. The aquarium appears to be well-maintained, with clear water and a substrate of small pebbles. There is no visible title, subtitle, or other informative text in the video.