Since the beginning of spring, the number of rains in most parts of China has been relatively small. In particular, the total amount of rain in some southern provinces and regions has been less than in previous years. Therefore, the water quality in the pond is not improved. At present, most of the pond water quality is aging, and the accidents of lack of oxygen floating ponds and dead fishes often occur, causing losses to the fishery production.
At present, most ponds have an average water storage depth of about 1.8 meters or less, and the temperature and water temperature continue to rise, and the transparency of the water is below 25 cm. Once the fish enter the high temperature season, the metabolism of the fish is very strong. At this time, feed must be reduced. Can not feed pellet feed, it is best to feed a single feed, such as cake, oil, or grass, because there is no distiller's grains, cakes, cakes in a single feed, will not make the water fat. In grain feed, the proportion of distillers grains, vegetable cakes and cotton cakes accounted for 45% to 50%. Both of them contain a large amount of vegetable protein and oils, which are easy to make water. Therefore, they cannot feed pelleted feed during the water shortage season. If the transparency of the pond water is less than 25 centimeters, the color of the water is dark blue. This kind of water is rich in nutrients. If there is no clear water added, there will be an oxygen-deficient floating head phenomenon every morning; especially the hot weather is more prominent. When there are thunderstorms, serious floating heads will appear around 10pm. Therefore, we must pay attention to the following points in management:
One, to strengthen the patrol pond at night must be more than patrol ponds, adhere to every 1 hour to go to the pond to see 1 time, as long as the fish emerged in the water we must promptly turn off the oxygen solution crisis, otherwise it will flood the pond dead fish.
Second, less feed bait season to less feed. The amount of bait per day is controlled at 1% to 1.5% of the fish weight, and the maximum amount does not exceed 2%. Although cakes and oil cakes are not easy to feed, there are two phenomena that can occur if feeds are fed too much:
1. The excrement of fish will also produce a certain amount of fertilizer and water.
2. When the fish eats too much, the oxygen consumption increases and they are more likely to die under hypoxic conditions.
It is recommended that during the water shortage season, feed should be applied only once a day in the morning and no feed should be given in the afternoon and evening to allow the fish to fast overnight and ensure safe production.
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