First, the measured water temperature is determined by the amount of feeding fish is a variable temperature animal, its digestion and feeding intensity and water temperature. The incidence of fish is also often closely related to the intensity of fish feeding. In general, the higher the water temperature is, the higher the food intake of the fish is in the proper temperature range (7°C to 32°C). To this end, it is necessary to strictly determine the amount of daily feeding based on the law of annual temperature rise and fall, so that the fish can eat well, grow fast, and get less sick. Specific method: In the early spring, when the water temperature rises above 6°C, feed it once a day. The amount of each feed begins to be 3% to 5% of the weight of the fish that was eaten on the day, such as pond grass and clams, and then gradually increase to prevent Overdose of grass causes fish digestive disorders and causes diseases such as fish enteritis. After May, when the water temperature rises to 15°C to 20°C, the amount of grass fed can be increased to 50% of the weight of the pond and squid on that day. From July to September, when the water temperature rises to 25°C, the amount of grass fed will increase. The amount can be stabilized at 80% of the weight of the pond grass and carp. Afterwards, as the water temperature drops, the amount of grass thrown in will decrease accordingly. In the entire process of vote-making, we must adhere to the "four definite" feeding method. Second, measuring the water transparency Fertilizer pond fish the most suitable water transparency is 25 cm to 30 cm. If the transparency is too low, it means that there is too much fertilizer in the water, the light ability is reduced, and the dissolved oxygen is reduced. At this time, the digestion of the feed is reduced and the resistance to disease is reduced. At this time, the amount of fertilizer should be reduced or the fertilizer should be stopped immediately; if the transparency of the water is too high, The lack of fertilizer in the water, the lack of plankton, the growth of fish and fish in ponds, etc., due to lack of bait and slow growth, resistance to disease weakened. At this time, some fertilizer should be applied. Generally, it is applied every 5 days to 7 days. The per acre Shi cooked organic fertilizer 50 kg to 80 kg or fertilizer 2 kg to 4 kg. In the fertilization process, organic fertilizer and chemical fertilizer must be used alternately, and the organic fertilizer needs to be decomposed by fermentation. The chemical fertilizer needs nitrogen, phosphorus and potassium. Third, the water pH value adjustment pH value of fish suitable for growth in neutral or slightly alkaline water, but often due to large stocks of organic matter, the water quality is often acidic, so the fish pond water should be regularly tested and timely adjustment The pH of the water. The specific method: perennial fish farming, water depth of 1 meter, lime per acre 20 kg to 25 kg dissolved after the whole pond spilled, once every half a month (after testing after the application), so that the fish can be in the best growing waters Environment. It must be noted that when the pH value is higher than 8.5, it is not conducive to fish growth. When the pH value exceeds 10 or less than 4.5, it will cause fish to die. IV. Determination of Dissolved Oxygen in Fixed Water Dosing The dissolved oxygen is not only the primary condition for the survival of fish, but also the oxygen content of the water has a great influence on the fish's food intake, feed utilization rate and fish body weight gain rate. Therefore, the appropriate dissolved oxygen index can not be based on whether the fish floating head is the standard, but should be to ensure the normal physiological needs of the fish such as appetite and exuberance. Although supersaturated oxygen in fish ponds is generally not harmful to fish, it causes bubbles in fish when the saturation is high (mainly at the fry stage). Too low dissolved oxygen causes fish floating and pan pools.