floating head Learn more about floating head
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Several causes and prevention of floating head of fish
The "floating head" of fish is a common phenomenon in aquaculture production, and it is also an important sign to judge whether fish get sick or not and the change of water quality. However, many farmers do not understand the cause after discovering the "floating head" of pond fish, and drug administration only based on "experience" is often ineffective and even lead to a large number of deaths. In fact, the floating head of fish can be caused by a variety of factors. According to the cause, "floating head" can be divided into the following three types. The anoxic floating head is due to the low content of dissolved oxygen in the water and the farmed fish swim to a relatively high surface.
2019-01-16 -
How to judge the weight of floating head of fish
The weight of the floating head of a fish is mainly judged by the time when the fish began to float, the location of the floating head, the size of the surface of the floating head and the species of the floating head fish. 1. Dark floating head. Usually occurs when it is already dawn but the sun has not yet come out, when the fish move in the middle of the pond and on the surface of the wind, you can see bursts of spray. At this time, the dissolved oxygen in the pond water body is 2-3 mg / L, which is a normal floating head. two。 Light floating head. It often happens at dawn, when the fish are in the middle of the pond and on the surface of the wind, and the wild fish are at the edge of the pond.
2019-01-16 -
Several situations of floating head of fish and their countermeasures
Several situations of floating head of fish and their countermeasures
2018-09-08 -
Integrated control technology of fish floating head
From June to October every year, the temperature is high and the weather is muggy. If the fish stocking quantity is too large and the water quality is bad, it is easy to cause anoxia floating head, or even suffocate to death. In severe cases, 1-2 hours can cause all the pond fish to die. Therefore, correctly analyzing the causes of fish floating head and identifying the omen and severity of fish floating head are of great significance to strengthen daily management and rescue Fantang in time. (1) the reasons for the floating head of fish. There are mainly the following aspects: (1) Blind excessive feeding and fertilization, resulting in excessive fertilizer of water quality, mass reproduction of plankton, and organic.
2019-01-15 -
Causes and control methods of floating head and floodpond in fish
Causes and control methods of floating head and floodpond in fish
2018-09-07 -
Attention, farmers! To prevent the floating head of fish in autumn, these six measures can be used for reference.
In the golden autumn season, floating head incidents occur frequently in the process of pond culture, which cause a large area of dead fish in the pond and cause serious economic losses to farmers. So why are there fish floating heads? What are the preventive measures? Why are fish prone to appear in autumn?
2020-11-11 Farmers attention autumn to guard against fish floating head this 6 items -
Prevent fish from floating their heads in summer
First, the prediction of floating head. Summer daytime light is strong, the temperature is high, the evening weather. Sudden thundershowers or southerly winds blow during the day, the water temperature is high, and suddenly turn to the north wind at night, the water temperature drops rapidly. two。 Continuous rain, low pressure, muggy, weak wind, foggy weather. 3. After a long time of sunshine and no rain, the fish ate vigorously, the water color was thick, and the weather suddenly changed. Second, the rescue of floating head, 1. Add new water to increase dissolved oxygen, improve water quality and increase the range of fish activities. two。 Turn on the aerator
2019-01-16 -
Analysis and Countermeasures of hypoxia in cultured Fish
Hypoxia refers to the state in which the internal tissues and cells of fish do not get enough oxygen to maintain their normal function. In order to distinguish from hypoxia in water, it can be called "biological hypoxia" or "tissue hypoxia". Asphyxia (dyspnea) is a phenomenon that occurs during biological hypoxia, and floating head is a common manifestation of dyspnea or asphyxia in aquaculture production. There are two cases of anoxic asphyxia in fish: one is that when the dissolved oxygen in the water is insufficient and the air pressure is too low, even if the respiratory function of the fish is normal, the tissues and cells in the body can not get enough oxygen, resulting in "anaerobic hypoxia";
2019-01-16 -
Penaeus vannamei is easy to float due to anoxia. How to prevent and control the floating phenomenon of Penaeus vannamei
Penaeus vannamei is easy to float due to anoxia. How to prevent and control the floating phenomenon of Penaeus vannamei
2018-10-28 -
Effective measures to prevent floating head of fish
Discharge an appropriate amount of pond water and inject new water, and the suitable time for adding water is about 2-3 o'clock in the afternoon. Rational use of aerator, stop fertilization, control the eating of fish. Sprinkle a small amount of quicklime water many times to regulate the pH of the water body. Chlorine dioxide was used twice to disinfect the water body, and an appropriate amount of oxygenator and microecological preparation could be applied before disinfection.
2019-01-16 -
Technique of main culture of freshwater Pomfret in shallow ponds
Among the existing ponds, shallow ponds still account for a large proportion. The water of this kind of pond is shallow, the drainage and irrigation is not matched, some are seasonally flooded into ponds, breed traditional fish, produce little fish, the benefit is very low. In order to explore the ways to increase production, increase income and increase efficiency of this kind of ponds, for two consecutive years from 1993 to 1994, we have a total area of 9.7 mu and a maximum water depth of 1. 5%. The experiment of main culture of freshwater Pomfret in shallow ponds was carried out in rice ponds, and satisfactory results were obtained in the absence of oxygen enrichment facilities: an average yield of 227 kg per mu in 1994.
2019-01-16 -
Summer is the golden season for fish farming. How to manage fish ponds well in summer?
Summer is the golden season for fish farming. How to manage fish ponds well in summer?
2018-07-14 -
High-yielding techniques of cultivating grass carp in ponds for two seasons a year
High-yielding techniques of cultivating grass carp in ponds for two seasons a year
2018-09-08 -
Pay attention to fishing in autumn
First, choose a good fishing time. When fishing, choose before and after dawn when it is sunny and the fish do not float their heads. At this time, fishing has the least impact on pond fish, and the fresh fish caught can be supplied to the morning market in time. When haze, muggy weather and pond fish have floating heads or fish diseases, it is not appropriate to draw nets to catch fish, so as not to cause a large number of dead fish and cause unnecessary economic losses. Second, stop eating or feeding less before capture. Stop eating or reduce the amount of feed the day before fishing, and do not feed a large amount of concentrate to increase the weight of fresh fish on the market. Because of
2019-01-15 -
Prediction and Rescue of Fish flooding Pond
The temperature is high in summer and autumn, and the microbial activity is active. if the amount of fertilization and feeding in the fish pond is large, it is easy to cause the fish to float due to hypoxia. If it is not rescued in time, the fish will suffocate to death. Therefore, at ordinary times, it is necessary to strengthen the management of fish ponds, do a good job in forecasting, and rescue the phenomenon of floating head of fish in time to prevent fish flooding in the pond. Signs in front of the floodpond in the afternoon of hot weather, if it is found that a large number of bubbles are produced by organic fermentation in the pond, covering 1 / 2 of the water area of the pond, it can be heard far away from the pond.
2019-01-16 -
What should we pay attention to when catching pond fish in autumn?
First, pay attention to the weather. In autumn, the fishing must be carried out before and after the dawn of sunny days, cool climate and non-floating head of the pond fish, which has the least impact on the fish in the pond and can supply the fresh fish caught in the morning market in time. Haze, muggy weather is not suitable for net fishing, so as not to cause a large number of dead fish. In addition, it is not suitable to catch fish in ponds when they have floating heads or fish diseases. Second, feed should be restricted before arrest. After the fish is full, the oxygen consumption increases, and it will jump and flee when pulling the net, which is easy to cause casualties. Therefore, the catch was made by pulling the net.
2019-01-16 -
Beware of fish flooding in summer and autumn high temperature season
The phenomenon of fish flooding often occurs in fish ponds due to negligence in management, which has caused great losses to fish farmers. In order to prevent pond fish from flooding, the symptoms, causes and control measures are briefly introduced as follows, which can be used as a reference for fish farmers. 1 symptoms of the disease pond fish floating head due to severe hypoxia, scattered throughout the pond, mouth opened and closed, calmly and directly from the surface of the air to absorb oxygen, serious slowly turn up, struggling to maintain balance, so repeated several times after the abdomen died upward. 2 dead fish species
2019-01-16 -
Treatment of fish flooding pond
Treatment of fish flooding pond
2018-07-23 -
Fish and shrimp savior for external use
Character: this product is composed of An and B compound drugs, An is yellow brown powder, B is reddish transparent liquid. Function and use: external medicine, mainly to prevent and cure bacteria, virus disease and anoxic floating head of fish and shrimp. Usage and dosage: (1) sprinkle in the whole pond: the concentration of preventing and curing bacterial and viral diseases of fish and shrimp is (1.5-3.0) ppm. (2) the concentration of rescuing fish and shrimp floating head was (2.0-3.0) ppm.
2019-01-16 -
What would a floating stone look like with a touch of moss? Teach you how to grow and how to care.
Spongy rock congealed by natural pumice magma. It gets its name because of its many pores, light weight, small bulk density and being able to float on the water surface. Natural pumice is characterized by light weight, high strength, acid and alkali resistance, corrosion resistance, no pollution, no radioactivity, etc.
2018-06-23