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Key points for autumn and winter rearing techniques of black carp, grass carp, silver carp and bighead carp broodstock
Broodstock rearing is an important part of the artificial propagation of black carp, grass carp, silver carp and bighead carp. The feeding and management work in autumn and winter directly affects the induced spawning results of the following year, so it must be given full attention. 1. Conditions and clearing of the broodstock pond. The pond for rearing broodstock should not only be close to the spawning pond but also have good water source conditions, and be convenient for irrigation and drainage. The pond bottom should have little mud; for silver carp and bighead carp ponds, a mud depth of 20 cm is sufficient, while black carp and grass carp ponds should contain little or no mud. The area should be 2000-3300 sq m, with a water depth of about 1.5 m. Broodstock rearing
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Prevention and Control Methods and Technical Key Points for Bighead Carp Emaciation Disease
1. Cause: Due to overstocking and insufficient feed, some fry or fingerlings cannot obtain enough feed, becoming emaciated and dying. 2. Symptoms: The diseased fish has a shrunken, thin, and emaciated body, a large head and small tail, a back resembling a knife blade, pale gill filaments, severe anemia, sluggish activity, and a darkened body color, dying shortly after. 3. Prevalence: This disease mostly occurs in the later stages of the fingerling rearing phase. It is caused by improper stocking density and mixing ratios and insufficient feeding in overwintering pond fingerlings and excessively densely stocked adult fish, especially in bighead carp.
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Methods and Techniques for Processing Silver Carp and Bighead Carp into Fish Balls
Silver carp and bighead carp, two of the "Four Major Chinese Carps," have many intermuscular bones and a flavor slightly inferior to other fish, so they often sell poorly, making the problem of processing and utilizing silver carp and bighead carp urgent to solve. Below is an introduction to the method of using silver carp and bighead carp to process and make fish balls. Auxiliary ingredient formula: based on 50 kg of fish meat, 1 kg of salt, 3 kg of starch, 0.5 kg of granulated sugar, 0.075 kg of monosodium glutamate, an appropriate amount of ginger juice, and a water content generally 50% to 60% of the fish meat weight. Key operating points: select
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Case study of silver carp and bighead carp cage culture
How many fish to stock in a cage is reasonable and correct should be determined according to the location and specific conditions. Generally speaking, in flowing water and in cages with high dissolved oxygen in the water, more can be stocked. In places with stable water, little wind and waves, and low oxygen in the water body, fewer can be stocked. In other words, the limit of stocking is when the oxygen in the cage can fully satisfy every fish. If the oxygen cannot meet the needs of the fish, it means the stocking is excessive. In fertile water (transparency of 25-30 cm), raising silver carp and bighead carp requires no feeding. Overall, the stocking amount can be based on the following
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What are the prevention and control methods for bighead carp emaciation disease
1. Cause: Due to excessive stocking density and insufficient feed, some fry or fingerlings cannot obtain enough feed and become emaciated and die. 2. Symptoms: The diseased fish has a shrunken, withered body, a large head and a small tail, a back like a knife blade, pale gill filaments, severe anemia, sluggish activity, and a darkened body color, dying not long after. 3. Prevalence: This disease mostly occurs in the later stage of the fingerling rearing phase. Fingerlings in overwintering ponds and overstocked adult fish are affected due to improper stocking density and mixing ratios and insufficient feeding, especially bighead carp.
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Do Bighead Carp Eat Phytoplankton? An Analysis of Their Feeding Habits
Bighead carp mainly feed on zooplankton, but also consume phytoplankton. According to research by Professor Ni Dashu, the average ratio of zooplankton to phytoplankton in the diet of bighead carp is 1:4.5. In terms of quantity, phytoplankton predominates, but in terms of biomass it is far surpassed by zooplankton, since on average a single zooplankton is 10 times larger than a single phytoplankton or more. Therefore, from an analysis of the feeding habits of bighead carp, the occurrence rate of phytoplankton is not low, but it is still zooplankton that plays the main nutritional role. Given this situation, the original Guangdong experience still leaves room for improvement, namely that the ratio of bighead carp to silver carp
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Key points of polyculture technology mainly for silver carp and bighead carp
With filter-feeding fish such as silver carp and bighead carp as the main cultured fish, appropriately polyculture other fish, with special attention to polyculturing fish that feed on organic detritus. During the rearing process, the main method used is applying farmyard manure. 1. The stocking amount of silver carp and bighead carp accounts for 70% to 70% of the total, and their output accounts for 60% to 70%. Their large-sized fingerlings are obtained by the method of supplementary culture in adult fish ponds. Silver carp and bighead carp fingerlings begin to be caught in rotation from May, with 6 to 7 rotational catches per year. After each rotational catch, large-sized fingerlings are immediately stocked supplementarily, and the number of supplementary stocked fingerlings is generally roughly equal to the number caught. 2. Mainly apply farm
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Cage Culture Technology for Silver Carp and Bighead Carp Fingerlings: Using Small and Medium-sized Reservoirs as Broodstock Bases
As the main drinking water source for Beijing, Miyun Reservoir plays a decisive role in the capital's economic development and social stability. In order to scientifically convert the nutrients and aquatic organisms in the water body of Miyun Reservoir, purify the water quality, and protect this basin of "water of life" for the capital, after the cancellation of cage fish farming, the Miyun County government increased the amount of fingerlings stocked, releasing 485,000 kg, nearly ten million individuals, of silver carp, bighead carp, bream, grass carp and other fingerlings into Miyun Reservoir each year, aiming to reduce the nutrient load of the water body through fishery production. However
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How to prevent and treat hemorrhagic ascites disease in bighead carp? A detailed guide to prevention and treatment strategies
As bighead carp has gradually become popular in the market, most ponds on the outskirts of our city have shifted from raising bighead carp as a secondary species to raising them as the main species. Bighead carp yields have grown from several dozen jin per mu when raised as a secondary species to over a thousand jin per mu now that they are the main species. Due to the increase in bighead carp farming density, the disease rate in bighead carp has also risen year by year, and mortality has climbed continuously, causing certain economic losses to farmers. Hemorrhagic ascites disease in bighead carp is an explosive infectious disease, also known as bacterial septicemia, and is caused by bacteria. Before the diseased fish die, they mostly swim slowly around the pond with darkened backs, and the mouths of the diseased fish
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How to identify grass carp, black carp, silver carp, and bighead carp with the naked eye
How to identify grass carp, black carp, silver carp, and bighead carp with the naked eye
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