1.5 kg -2 kg. Siniperca chuatsi, also known as osmanthus fish and seasonal flower fish, is a freshwater fish of the genus Siniperca. The fish 1.5 kg -2 kg is delicious. The fish is about 28 cm long, with a spindle shape, a high body, a flat side, a bulging back, a big head, an inclined mouth crack, a protruding lower jaw, and a lower jaw extending to the back edge of the eye.