The video shows a blue crayfish in an aquarium. The crayfish is seen moving around and hiding inside a rock. The rock is brown and has a rough texture. The crayfish has a bright blue color and is the only living creature visible in the video. The aquarium appears to be well-maintained, with clear water and no visible debris. The crayfish moves in and out of the rock, sometimes hiding and sometimes coming out to explore its surroundings.