Nutritional feed for breeding river crabs and preparation method thereof

Abstract

The invention belongs to the technical field of aquaculture, and relates to a nutritional feed for breeding river crabs and a preparation method thereof, the nutritional feed for breeding river crabs comprises the following raw materials by mass fraction: 30%-38% of bean dreg protein, 20%-30% of high protein powder, 7%-13% of edible mushroom concentrated feed, 5%-10% of fermented feed, 1%-5% of a phagostimulant, 0.5%-2% of a composite additive, and the balance of corn flour. The feed provided by the invention can significantly reduce the death rate of the river crabs and improve the yield of the river crabs.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture and relates to a nutritious feed for river crab breeding and a preparation method thereof. Background Art

[0002] The scientific name of river crab is Chinese mitten crab. It mainly lives in freshwater bodies such as rivers and lakes. It especially likes to live in water bodies with lush aquatic plants, fresh water quality and abundant natural bait. It is an important freshwater economic aquaculture crab in my country. River crabs are omnivorous animals, so the sources of feed for river crabs are relatively wide, including: natural bait, animal bait and artificial compound feed. Among them, natural feed mainly refers to plankton and various aquatic plants in the water body; animal feed refers to snails, shrimps, small fish, etc.

[0003] Traditional baits in river crab farming are generally wheat, corn, soybeans, cakes and meal mixed with fresh fish, which can easily lead to nutritional imbalance of river crabs and deterioration of crab pond water quality, causing an increase in the incidence of river crabs, which in turn affects the nutritional quality and yield of river crabs. Artificial compound feeds have the advantages of balanced nutrition, stable quality, and convenient feeding. They can meet the growth and development needs of river crabs, reduce waste and emissions, protect aquaculture water bodies, achieve sustainable and healthy development of river crab farming, and at the same time improve the quality and yield of river crabs, which meets the interests of farmers. Summary of the invention

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a nutritious feed for river crab farming and its preparation method and application in view of the deficiencies of the prior art. The present invention provides a preparation method for nutritious feed for river crab farming, which increases the yield of river crabs and improves the quality of river crabs.

[0005] In order to solve the above technical problems, the present invention discloses a nutritious feed for river crab farming and a preparation method and application thereof. The specific technical scheme is as follows:

[0006] A nutritious feed for river crab breeding, the formula of which is, by mass fraction, 30% to 38% of soybean dregs protein, 20% to 30% of high-protein powder, 7% to 13% of edible fungus concentrate feed, 5% to 10% of fermented feed, 1% to 5% of attractant, 0.5% to 2% of compound additive, and the rest is corn flour;

[0007] The composite additive is a combination of vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate.

[0008] Preferably, the formula is as follows, by mass fraction: 33% to 37% dregs of soybean protein, 23% to 28% of high-protein powder, 7% to 10% of edible fungus concentrate feed, 8% to 10% of fermented feed, 3% to 5% of attractants, 1% to 2% of compound additives, and the rest is corn flour.

[0009] Further preferably, the formula is as follows, by mass fraction: 35% dregs of soybean protein, 25% high-protein powder, 9% edible fungus concentrate feed, 8% fermented feed, 3% attractant, 1.5% compound additive, and the rest is corn flour.

[0010] Preferably, the okara protein has a detailed preparation method as shown in Chinese patent CN116268177A, and the continuous fermentation preparation method as shown in Example 3 thereof.

[0011] The high-protein powder has a crude protein content of >85% w / w. The detailed preparation method thereof can be found in Chinese patent CN116121078A, and the high-protein powder prepared by the preparation method described in Example 6 thereof can be found in detail.

[0012] The edible fungus concentrate feed is prepared according to the following method: adding edible fungi strains to a composite fermentation medium, fermenting under fermentation conditions of staged control of rotation speed and pH, obtaining mycelium through solid-liquid separation after the fermentation, and then dispersing and alkali-treating the mycelium to prepare the edible fungus concentrate feed;

[0013] Wherein, the composite fermentation medium comprises: 10-35 g / L corn sugar, 10-30 g / L corn steep liquor, 4-12 g / L ammonium sulfate, 0.5-1.5 g / L phosphoric acid, 0.1-1 g / L magnesium sulfate, 0.2-1.5 g / L bran, 0.02-0.2 g / L zinc sulfate, 0.002-0.2 g / L nicotinamide, 0.0005-0.05 g / L biotin, and pH 6.0. Preferably, the detailed preparation method thereof is shown in Chinese patent CN115843919A, wherein the bacterial liquid after fermentation under the condition of pH 5 / 400 rpm in Example 6 is separated, the bacterial body is directly dried and crushed, and the edible fungus concentrate feed is obtained by passing through a 100 mesh sieve.

[0014] The fermented feed is prepared according to the following method: the skin of ganoderma lucidum is inoculated into a seed liquid culture medium to obtain ganoderma lucidum seed liquid; the ganoderma lucidum fermentation culture medium, defoamer and the ganoderma lucidum seed liquid are added to a fermentation tank, water is added to make up to 60-80% of the volume of the fermentation tank, fermentation culture is carried out to obtain a fermentation product, centrifuge, and dry the precipitate to obtain the fermented feed. The detailed preparation method thereof is shown in Chinese patent CN117958352A, see Example 7 thereof for details, and the preparation is carried out according to the optimal fermentation culture medium and fermentation conditions.

[0015] The attractant is prepared by the following method: inoculating the seed liquid of the fungal species into the fungal fermentation medium for liquid fermentation to obtain the fermentation material, then subjecting the fermentation material to enzymatic hydrolysis and solid-liquid separation to obtain the filtrate, and finally concentrating the filtrate to obtain the paste attractant, or concentrating the filtrate and then spray drying to obtain the powder attractant; wherein the fungal species is a filamentous fungus or an edible fungus. The detailed preparation method is described in Example 4 of Chinese Patent CN116998599A.

[0016] Among them, in the composite additive, the mass ratio of vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate is 1:1:1:0.5:1.5:1.5:1:0.3:0.5.

[0017] The uridylic acid is uridylic acid sodium salt.

[0018] The cytidylic acid is 5'-cytidine monophosphate monohydrate.

[0019] The fructose-1,6-diphosphate is fructose-1,6-diphosphate calcium salt.

[0020] The river crab breeding nutritious feed of the present invention can be used for breeding river crabs for 4 months.

[0021] The per-acre yield of river crabs cultured using the river crab culture feed of the invention is 150-165 kg / acre, and the mortality rate of river crabs is 3.0%-4.5%.

[0022] Beneficial effects:

[0023] The present invention provides a nutritious feed for river crab breeding and a preparation method thereof. The nutritious feed provided by the present invention has a reasonable ratio and is rich in nutrition, thereby improving the utilization rate of the feed and reducing the crab pond water pollution phenomenon caused by excess feed in the current river crab breeding. In addition, the nutritious feed is additionally added with a composite additive, comprising nutrients such as multiple vitamins, nucleotides, amino acids, etc., which can improve the disease resistance of river crabs after consumption, achieve a lasting drug effect, and reduce the mortality rate of river crabs.

[0024] The nutrient feed for river crab breeding prepared by the present invention has both nutrient and antibacterial functions, improves the living conditions of river crabs, and increases the yield, quality and breeding benefits. The nutrient feed for river crab breeding prepared by the present invention is used to breed river crabs, which can increase the per-acre yield of river crabs by 10%-16%, reduce the mortality rate to below 4.5%, and significantly improve the breeding benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0026] Figure 1 The invention discloses a nutritious feed for breeding river crabs. DETAILED DESCRIPTION

[0027] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the contents described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0028] The experimental methods described in the following examples are all conventional methods unless otherwise specified; the materials, including corn flour, were purchased from Wenshang County Zhongcheng Grain Industry Co., Ltd., and the remaining materials were produced by Nanjing High-Tech University Biotechnology Research Institute Co., Ltd. and Jiangsu Jicui Industrial Biotechnology Research Institute Co., Ltd., as follows:

[0029] The detailed preparation method of the okara protein is shown in Chinese patent CN116268177A, and the continuous fermentation preparation method described in Example 3 thereof is shown in detail.

[0030] The high-protein powder has a detailed preparation method as shown in Chinese patent CN116121078A, and the high-protein powder prepared by the preparation method described in Example 6 is shown in detail.

[0031] The edible fungus concentrate feed has a detailed preparation method as shown in Chinese patent CN115843919A, wherein the conditions in Example 6 are as follows: pH 5 / 400rpm, the bacterial liquid is separated after fermentation, the bacterial bodies are directly dried and crushed, and the edible fungus concentrate feed is obtained by passing through a 100-mesh sieve.

[0032] The fermented feed has a detailed preparation method as described in Chinese patent CN117958352A, see Example 7 thereof for details, and is prepared according to the optimal fermentation medium and fermentation conditions.

[0033] The detailed preparation method of the food attractant is described in Example 4 of Chinese Patent CN116998599A.

[0034] The composite additive comprises vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate;

[0035] Among them, vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridine monophosphate, cytidine monophosphate, threonine, N-acetylneuraminic acid and fructose-1,6-bisphosphate mainly provide nutrients such as vitamins and amino acids for river crabs, while cyclic adenosine monophosphate and fructose-1,6-bisphosphate can also be used as high-energy compounds to provide energy for the growth and metabolism of river crabs. The ratio of these substances should be kept as low as possible while ensuring the provision of nutrition.

[0036] Therefore, in the composite additive described in the following examples, the mass ratio of vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate is 1:1:1:0.5:1.5:1.5:1:0.3:0.5.

[0037] Wherein, the uridine monophosphate is uridine monophosphate sodium salt.

[0038] The cytidylic acid is 5'-cytidine monophosphate monohydrate.

[0039] The fructose-1,6-diphosphate is fructose-1,6-diphosphate calcium salt.

[0040] The river crab breeding site described in the following embodiments is No. 182, Zhangjiagou, Yongfu Village, Yangjiang Town, Gaochun District, Nanjing City, with a breeding area of ​​50 mu.

[0041] Coordinate A longitude: 118.78332900 latitude: 31.33047000

[0042] Coordinate B longitude: 118.79056000 latitude: 31.33085600

[0043] Coordinate C Longitude: 118.78390400 Latitude: 31.32375300

[0044] Coordinate D longitude: 118.79057800 latitude: 31.32379200

[0045] Preparation location: Danhu Cold Storage, Yangjiang Town, Gaochun District (S360 South) Longitude: 118.88050800 Latitude: 31.33000070

[0046] Example 1

[0047] A method for preparing a nutritious feed for river crab breeding is as follows:

[0048] Prepare the feed accurately according to the following weight ratio: 35% dregs protein, 25% high protein powder, 9% edible fungus concentrate feed, 8% fermented feed, 3% attractant, 1.5% compound additive, and 18.5% corn flour.

[0049] The above components are mixed evenly with a mixer until the color of the feed is uniform, dried naturally, and stored in a cool, dry and ventilated place for later use. The feed prepared in this embodiment is as follows: Figure 1 shown.

[0050] Example 2

[0051] A method for preparing nutritious feed in river crab farming is as follows:

[0052] The feed was accurately prepared according to the following weight ratio: 37% dregs protein, 26% high protein powder, 10% edible fungus concentrate feed, 9% fermented feed, 4% attractant, 2% compound additive, and 12% corn flour.

[0053] Use a blender to evenly mix the above components until the color of the feed is uniform, dry it naturally, and store it in a cool, dry and ventilated place for later use.

[0054] Example 3

[0055] A method for preparing nutritious feed in river crab farming is as follows:

[0056] Prepare the feed accurately according to the following weight ratio: 33% dregs protein, 23% high protein powder, 7% edible fungus concentrate feed, 5% fermented feed, 2% attractant, 0.5% compound additive, and 29.5% corn flour.

[0057] Use a blender to evenly mix the above components until the color of the feed is uniform, dry it naturally, and store it in a cool, dry and ventilated place for later use.

[0058] Example 4

[0059] A method for preparing nutritious feed in river crab farming is as follows:

[0060] Prepare the feed accurately according to the following weight ratio: 37% dregs protein, 28% high protein powder, 10% edible fungus concentrate feed, 10% fermented feed, 5% attractant, 2% compound additive, and 8% corn flour.

[0061] Use a blender to evenly mix the above components until the color of the feed is uniform, dry it naturally, and store it in a cool, dry and ventilated place for later use.

[0062] Example 5

[0063] A method for preparing nutritious feed in river crab farming is as follows:

[0064] The feed was accurately prepared according to the following weight ratio: 36% soybean dregs protein, 27% high protein powder, 8% edible fungus concentrate feed, 9% fermented feed, 4% attractant, 1.5% compound additive, and 14.5% corn flour.

[0065] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0066] Example 6

[0067] A method for preparing nutritious feed in river crab farming is as follows:

[0068] Prepare the feed accurately according to the following weight ratio: 33% dregs protein, 25% high protein powder, 9% edible fungus concentrate feed, 9% fermented feed, 1.5% attractant, 1% compound additive, and 21.5% corn flour.

[0069] Use a blender to evenly mix the above components until the color of the feed is uniform, dry it naturally, and store it in a cool, dry and ventilated place for later use.

[0070] Comparative Example 1

[0071] The preparation method of the high-protein powder in the present invention is detailed in Chinese patent CN116121078A. The protein content of the high-protein powder is above 80%, which mainly provides protein for the growth of river crabs. Traditional river crab feed mainly uses fish meal as a protein source. Therefore, the high-protein powder in the feed formula of Example 1 is replaced with an equal amount of fish meal.

[0072] The feed formula is calculated by weight: 35% soybean dregs protein, 25% fish meal, 9% edible fungus concentrate feed, 8% fermented feed, 3% attractant, 1.5% compound additive, and 18.5% corn flour.

[0073] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0074] Comparative Example 2

[0075] The detailed preparation method of the soybean dregs protein in the present invention is shown in Chinese patent CN116268177A. By reusing the wet soybean dregs, a byproduct of the soybean product production process, the protein and amino acid content is increased to provide nutrition for the growth of river crabs. The bean cake in the traditional river crab feed has a short shelf life and is prone to mold and deterioration. The soybean dregs protein in the feed formula of Example 2 is replaced with an equal amount of soybean cake.

[0076] The feed formula is calculated by weight: 37% soybean cake, 26% high-protein powder, 10% edible fungus concentrate feed, 9% fermented feed, 4% attractant, 2% compound additive, and 12% corn flour.

[0077] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0078] Comparative Example 3

[0079] The edible fungus concentrate feed in the present invention is an invention patent of the company, which has low cost, is rich in nutrients such as amino acids and vitamins, and provides nutrition for the growth of river crabs. The edible fungus concentrate feed in the feed formula of Example 3 is replaced with an equal amount of vegetable cake powder.

[0080] The feed formula is calculated by weight: 33% soybean dregs protein, 23% high protein powder, 7% vegetable cake powder, 5% fermented feed, 2% attractant, 0.5% compound additive and 29.5% corn flour.

[0081] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0082] Comparative Example 4

[0083] The detailed preparation method of the fermented feed in the present invention is shown in Chinese patent CN117958352A, which is prepared from byproduct raw materials such as wine lees, cassava residue, potato residue, kelp residue, pepper residue and Chinese medicine residue as substrates, has low cost, is rich in nutrients such as amino acids and vitamins, and provides nutrition for the growth of river crabs. The fermented feed in the feed formula of Example 4 is replaced with an equal amount of sweet potato powder.

[0084] The feed formula is calculated by weight: 37% soybean dregs protein, 28% high protein powder, 10% edible fungus concentrate feed, 10% sweet potato powder, 5% attractant, 2% compound additive, and 8% corn flour.

[0085] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0086] Comparative Example 5

[0087] The detailed preparation method of the attractant in the present invention is shown in Chinese patent CN116998599A, which uses filamentous fungi with strong odor as raw materials, replacing traditional animal liver hydrolyzate, achieving 100% utilization of all components, no pollution discharge, and high production efficiency. The attractant in the feed formula of Example 5 is replaced with an equal amount of bone meal.

[0088] The feed formula is calculated by weight: 36% soybean dregs protein, 27% high protein powder, 8% edible fungus concentrate feed, 9% fermented feed, 4% bone meal, 1.5% compound additives, and 14.5% corn flour.

[0089] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0090] Comparative Example 6

[0091] The composite additive of the present invention contains a variety of amino acids, nucleotides and other substances, and has high biological activity. The composite additive in the feed formula of Example 6 is replaced with an equal amount of mineral additive (calcium formate, active ingredient content ≥ 99%).

[0092] The feed formula is calculated by weight: 33% dregs protein, 25% high protein powder, 9% edible fungus concentrate feed, 9% fermented feed, 1.5% attractant, 1% mineral additive and 21.5% corn flour.

[0093] Use a mixer to mix all the ingredients evenly until the color of the feed is uniform, dry it naturally, and store it in a cool, dry and ventilated place for later use.

[0094] Comparative Example 7

[0095] The original feed formula for river crab farming is calculated by weight as follows: fish meal 20%, soybean cake powder 25%, vegetable cake powder 15%, corn powder 25%, sweet potato powder 10%, bone meal 3%, and mineral additives 2%.

[0096] Use a blender to mix all components evenly until the color of the feed is uniform, dry naturally, and store in a cool, dry and ventilated place for later use.

[0097] In the same breeding area, the crabs in 36 mu of crab ponds were fed with the feeds formulated in Examples 1 to 6, and 6 mu of crab ponds were fed with each formula in Example 1 to 7; 2 mu of crab ponds were fed with the feed formulas in Comparative Examples 1 to 7, respectively. Except for the different feeds used, the rest of the feeding conditions such as breeding density, aquatic plant species, and water quality management were the same for the crabs in the 50 mu crab ponds. The amount of feed fed was determined according to the size, density, season, and weather of the crabs. The feed was released twice a day on average, and the average daily dosage was flexibly adjusted with the changes in seasons. The feeding amounts of different feeds were the same. The feed prepared by the present invention was fed 4 months after the seedlings were put in, and the feeding time was 4 months. The results are shown in Table 1. Under the same feeding amount, the feed formula prepared by the present invention has a better breeding effect.

[0098] The mortality rates described in Table 1 were calculated as follows:

[0099] Number of surviving crabs = yield per mu / (average weight of male and female crabs),

[0100] Mortality rate = 1-(number of surviving crabs / number of crabs released) x 100%.

[0101] Table 1. Yield of river crab per mu

[0102] Group Yield (kg / mu) mortality rate(%) Example 1 160.2 4.1 Comparative Example 1 151.3 5.2 Example 2 155.9 5.3 Comparative Example 2 147.2 5.8 Example 3 153.1 3.9 Comparative Example 3 147.9 4.6 Example 4 158.3 4.2 Comparative Example 4 149.4 5.0 Example 5 153.0 5.1 Comparative Example 5 141.5 5.7 Example 6 157.6 4.8 Comparative Example 6 152.6 5.9 Comparative Example 7 (Original Feed Formula) 138.5 9.4

[0103] It can be seen from Table 1 that compared with the original feed breeding conditions (Comparative Example 7), after using nutritious feed, the per mu yield of river crabs increased by 10%-16%, and the mortality rate was significantly reduced; after replacing the components of the formula of the present invention with the same functional components (Comparative Examples 1-6), the river crab yield was lower than the river crab yield of the corresponding embodiment. The formula of the present invention effectively increases the crab yield, enhances the breeding effect, and is in line with the interests of farmers.

[0104] The present invention provides a crab breeding nutritious feed and a method for preparing the same. There are many methods and approaches to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A nutritious feed for river crab breeding, characterized in that: The formula is as follows by mass fraction: 30% to 38% soybean dregs protein, 20% to 30% high protein powder, 7% to 13% edible fungus concentrate feed, 5% to 10% fermented feed, 1% to 5% attractant, 0.5% to 2% compound additive, and the rest is corn flour; The composite additive is a combination of vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate.

2. The nutritious feed for river crab breeding according to claim 1, characterized in that: Calculated by mass fraction, the formula is: 33% to 37% dregs of soybean protein, 23% to 28% of high-protein powder, 7% to 10% of edible fungus concentrate feed, 8% to 10% of fermented feed, 3% to 5% of attractants, 1% to 2% of compound additives, and the rest is corn flour.

3. The nutritious feed for river crab breeding according to claim 1, characterized in that: Calculated by mass percentage, the formula is: 35% soybean dregs protein, 25% high protein powder, 9% edible fungus concentrate feed, 8% fermented feed, 3% attractant, 1.5% compound additive, and the rest is corn flour.

4. The nutritious feed for river crab breeding according to claim 1, characterized in that: The crude protein content of the high-protein powder is greater than 85% w / w.

5. The nutritious feed for river crab breeding according to claim 1, characterized in that: The edible fungus concentrate feed is prepared according to the following method: adding edible fungi strains to a composite fermentation medium, fermenting under fermentation conditions of staged control of rotation speed and pH, obtaining mycelium through solid-liquid separation after the fermentation, and then dispersing and alkali-treating the mycelium to prepare the edible fungus concentrate feed; The composite fermentation medium comprises the following components: 10-35 g / L corn sugar, 10-30 g / L corn steep liquor, 4-12 g / L ammonium sulfate, 0.5-1.5 g / L phosphoric acid, 0.1-1 g / L magnesium sulfate, 0.2-1.5 g / L bran, 0.02-0.2 g / L zinc sulfate, 0.002-0.2 g / L nicotinamide, 0.0005-0.05 g / L biotin, and a pH of 6.

0.

6. The nutritious feed for river crab breeding according to claim 1, characterized in that: The fermented feed is prepared according to the following method: the skin of ganoderma lucidum is inoculated into a seed liquid culture medium to obtain ganoderma lucidum seed liquid; the ganoderma lucidum fermentation culture medium, defoaming agent and the ganoderma lucidum seed liquid are added into a fermentation tank, water is added to make up to 60-80% of the volume of the fermentation tank, fermentation culture is carried out to obtain a fermentation product, centrifuge, and the precipitate is taken and dried to obtain the fermented feed.

7. The nutritious feed for river crab breeding according to claim 1, characterized in that: The attractant is prepared according to the following method: inoculating the seed liquid of the fungal species into the fungal fermentation medium for liquid fermentation to obtain the fermentation material, then subjecting the fermentation material to enzymatic hydrolysis and solid-liquid separation to obtain the filtrate, and finally concentrating the filtrate to obtain a paste-like attractant, or concentrating the filtrate and then spray-drying it to obtain a powdered attractant; wherein the fungal species is a filamentous fungus or an edible fungus.

8. The nutritious feed for river crab breeding according to any one of claims 1 to 7, characterized in that: In the composite additive, the uridine monophosphate is uridine monophosphate sodium salt; and the fructose-1,6-diphosphate is fructose-1,6-diphosphate calcium salt.

9. The nutritious feed for river crab breeding according to any one of claims 1 to 7, characterized in that: In the composite additive, the mass ratio of vitamin C, vitamin D, lysine, cyclic adenosine monophosphate, uridylic acid, cytidylic acid, threonine, N-acetylneuraminic acid and fructose-1,6-diphosphate is 1:1:1:0.5:1.5:1.5:1:0.3:0.5.

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