Rescue of ammonia nitrogen poisoning in pond fish
Feeding carp, grass carp, bream, white pomfret, crucian carp, etc. with pellet feed, due to large feeding amount, excrement and residual food increase, nitrogen substances generated by protein decomposition increase, a little carelessness, these fish will occur ammonia nitrogen poisoning, light will affect normal growth, serious will cause fish death. The identification and rescue methods of ammonia nitrogen poisoning in pond fish are introduced as follows.
I. Identification of poisoning
1. Characteristics of occurrence. Ammonia nitrogen poisoning, no season, morning and evening and good or bad weather points, more common in adult fish ponds, high-yield ponds, closed culture ponds and can be irrigated can not discharge fish ponds.
2. Toxic symptoms. Fish breathe fast and swim wildly. After swimming slow, paralysis and weakness; then dark body, gills black, purple mouth, mucus increased; finally lost vitality, slowly sank to the bottom and died.
3. Oxygen is ineffective. After the pond fish ammonia nitrogen poisoning, turn on the aerator, the pond fish are scattered to avoid, dare not approach. The pelagic fish did not respond to the oxygenator.
II. Rescue measures
1. Add fresh water in time to reduce ammonia nitrogen concentration in the original pool and prevent poisoning from deepening.
2. Sprinkle salt to prevent ammonia nitrogen and nitrate nitrogen from continuing to invade fish blood. 17 kg of salt is available per 667 m2 of water surface.
3. Zeolite powder and medical stone powder are scattered to absorb harmful gases and toxic substances at the bottom of the pool.
4. After the poisoning has been alleviated, fungicides should be added to the water to prevent bacterial infection.
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The scale culture of Pelteobagrus fulvidraco is difficult and the effect of mixed culture is good.
Pelteobagrus fulvidraco is a benthic omnivorous fish with delicate meat, rich nutrition and high economic value, so it is a cultured species with great market potential. Pelteobagrus fulvidraco has strong adaptability and its growth rate is slower than that of cyprinid fish, but it grows faster for the species itself. the fry propagated in that year can meet the commercial specifications, and the population yield is higher. At present, there are some difficulties in large-scale artificial culture, so it is imperative to carry out mixed culture. Mixed culture of Pelteobagrus fulvidraco in fishing ponds has the following advantages: first, it can feed on small miscellaneous fish and shrimps of low value in the pond.
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Feeding of grass silver carp and bighead carp in autumn and winter
The breeding of parent fish is an important link in the artificial reproduction of green, grass, silver carp and bighead carp. The feeding and management in autumn and winter directly affects the effect of spawning in the second year, so full attention must be paid to it. 1. Conditions and cleaning of fish ponds. The fish ponds for breeding parent fish should not only be close to the spawning pond but also have good water source conditions, and it is convenient for irrigation and drainage. The bottom of the pond is less silt, silver carp and bighead carp ponds with a depth of 20 centimeters is enough, green and grass carp ponds should contain little or no silt. The area is 2000,3300 square meters and the water depth is about 1.5 meters. Parent fish cultivation
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