Dead fish problem in fish ponds

The phenomenon of a large number of dead fish in fish ponds is called flooding. The main reasons are as follows:

1, the temperature is abnormal, and the spatial layer where all kinds of fish live is disrupted. Fish are basically concentrated in the middle and lower layers of water, and fat fish mainly living in the upper layers of water also turn to the middle and lower layers. This group generally accounts for more than half of the fish carried in aquaculture ponds. Therefore, the fish in the middle and lower layers of the pond are relatively dense and will flood after midnight.

2, do not know how to feed scientifically, feed aquatic plants in large quantities, let them eat, how much to eat, there is no control, especially in the afternoon and at night, which increases the respiration of fish and increases the oxygen consumption. At the same time, the discharge of a large amount of fish manure and the decomposition of organic matter consume oxygen, which is also easy to cause flooding.

3. Some fish ponds have not been cleaned for many years, and wild fish and shrimp are over-bred, competing with cultured fish for oxygen. At the same time, the silt is deep, and the silt in some ponds exceeds 1 m, and the water quality deteriorates, turning black and stinking. After plankton overgrowth, plankton first died and became a "stagnant pool". Due to the death of phytoplankton, the photosynthesis of phytoplankton is reduced, and photosynthesis is an important source of dissolved oxygen in water, which is almost completely lost. The source of dissolved oxygen in water is reduced, which is easy to cause flooding.

4. Some aquaculture ponds lack oxygen-increasing equipment and emergency oxygen-increasing drugs.

In view of the above reasons, in order to reduce your losses, we suggest taking the following measures:

First, adjust the water quality in time.

1. Water is the environment on which fish live. To raise a pond of fish, we must first manage a pond of water. In hot season, fish ponds should be changed and covered in time. Fish can't be raised by rain alone. Supplementing fresh water can not only bring in oxygen and some nutrients that are lacking in the pool water, but also dilute the metabolites in the pool water.

2, regular application of quicklime, once every 20 days, now bubble splash. On the second day after the application of quicklime, oxygen-increasing agents such as oxygen-enriched treasure must be applied again to prevent the substances precipitated after the use of quicklime from rotting and consuming oxygen.

Second, scientific feeding.

Bait and application of aquatic plant for feeding:

1, disinfection of bait. Animal bait must be cleaned and disinfected. Some fish don't eat rotten food, and throwing rotten food will cause water pollution.

2. Control of input. Feeding is changed to once every morning. High temperature season is the peak season for fish growth, and the oxygen consumption increases, so it is more appropriate to control the feeding amount to 80% of fish saturation. And often observe the activities and food intake of fish and make adjustments at any time.

I hope the above methods can help you reduce losses and feed scientifically. I hope to adopt them. Thank you!