The video shows a blue crayfish crawling around the bottom of an aquarium. The crayfish is bright blue in color and has long antennae and legs. It moves slowly and gracefully across the black gravel-covered floor of the tank. The aquarium is well-lit, and the water is clear, allowing for a good view of the crayfish and its surroundings. There are no other visible creatures in the tank, and the background is mostly dark with some rocks and plants.