A person, wearing blue protective gloves on both hands, is shown skillfully filleting a large, deep red piece of fish, identified as tuna. The activity takes place on a bright blue cutting surface, suggesting a professional kitchen or fish processing environment. The individual uses a long, sharp knife to expertly separate different sections of the tuna. The knife is guided with precision to cut along the natural lines of the fish, likely removing the dark meat (marmolillo or ventresca) or separating the loin from the bone structure. The tuna meat is a rich, dark red, indicative of its freshness and quality. A tattoo with text is visible on the person's right forearm, though the words are not clearly legible. The focus of the video is on the meticulous technique and the efficiency of the fish preparation. The setting, particularly the large size of the tuna cut, implies a commercial context, possibly within a fish market or a processing plant in Barbate, Spain, a region renowned for its bluefin tuna. No specific time of day or emotional states are discernible.