１．正常鱼的行为表征①水面无鱼。池塘、网箱养鱼，水面不见鱼上浮、跳跃、狂游、乱窜等现象，说明水质好，鱼正常无病。②摄食旺象。在投入饲后，鱼游集食场吃食，鱼群密集争食，鱼体互相拥挤、叠层，但不跳跃、不乱窜、不散群，很安稳，这说明鱼正常。反之，鱼摄食不旺或免 1. Behavior of normal fish behavior ① surface without fish. Ponds, fish cage cage, the surface of the fish did not see floating, jumping, mad swimming, chaos channeling phenomenon, indicating good water quality, normal fish disease-free. ② feeding vigil. After feeding, the fish swim at the food court to eat, the fish fight intensively, the fish crowded each other, stacked, but not jumping, not chaos, not scattered groups, it is stable, indicating that fish normal. Conversely, the fish is not eating or free