かつお (katsuo) is a type of fish known as skipjack tuna. It is commonly found in warm ocean waters and is an important part of Japanese cuisine. Katsuo is often enjoyed fresh as sashimi or grilled, and it is also used to make dashi, a traditional Japanese soup stock. In addition to its culinary uses, katsuo is rich in nutrients, including omega-3 fatty acids, which are beneficial for heart health. The fish is typically caught during specific seasons, and its flavor is considered to be particularly delicious when it is freshly prepared.