Bionic blue crab wiredrawing compound feed and preparation method thereof

Abstract

The invention discloses a simulated ecological blue crab wiredrawing compound feed and a preparation method thereof. The simulated ecological blue crab wiredrawing compound feed comprises the following raw materials in parts by weight: 30-40 parts of fish steak powder, 15-25 parts of rice bran, 10-15 parts of shrimp head powder / shrimp shell powder, 10-15 parts of fish bone meal, 8-10 parts of alpha-starch, 5-10 parts of spirulina powder, 15-33 parts of a microbial source raw material, 2-4 parts of an inorganic raw material and 1-2 parts of a synthetic raw material. According to the feed, various raw materials such as the fish steak powder, the rice bran, the shrimp head powder / shrimp shell powder and the fish bone meal are scientifically proportioned, so that comprehensive nutrients, including proteins, carbohydrates, fat, vitamins and minerals, required by the growth of the blue crabs are provided.

Description

Technical Field

[0001] The invention discloses an ecologically simulated blue crab wire drawing compound feed and a preparation method thereof, and belongs to the field of blue crab breeding. Background Art

[0002] Currently, mud crab farming is booming around the world and has become an important part of the aquaculture industry.

[0003] However, with increasing stocking density and increasingly complex aquaculture environments, mud crabs face new challenges in nutritional needs and health management. Traditional mud crab feeds often suffer from nutritional imbalances, low digestibility, and water pollution. These factors lead to slow growth, weak disease resistance, and reduced meat quality, impacting aquaculture profitability and market competitiveness.

[0004] Specifically, the mud crab feed in the prior art may have the following deficiencies:

[0005] Single protein source: Some feeds rely on only one or a few protein sources, which cannot meet the blue crab's demand for diversified amino acids at different growth stages.

[0006] Deficiency of minerals and vitamins: The unreasonable ratio of minerals and vitamins in the feed leads to poor growth of the blue crab shell and decreased immunity.

[0007] Improper use of additives: Excessive or improper use of antibiotics, growth promoters and other additives not only increases breeding costs, but may also have a negative impact on the health of blue crabs and water quality.

[0008] Feed form and utilization rate: Traditional pellet feed easily scatters in water, leading to nutrient loss and water pollution, and reducing feed utilization rate.

[0009] Therefore, developing a nutritionally balanced, easily digestible, stable-shaped and environmentally friendly ecological blue crab silk-drawing feed is of great significance for improving the efficiency of blue crab farming and promoting the healthy growth of blue crabs. Summary of the Invention

[0010] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an ecological blue crab drawing feed and a preparation method thereof to solve the problems.

[0011] In order to achieve the above-mentioned purpose, the present invention realizes an ecological blue crab drawing compound feed through the following technical scheme, which includes the following raw materials in parts by weight: 30 to 40 parts of fish fillet powder, 15 to 25 parts of rice bran, 10 to 15 parts of shrimp head powder / shrimp shell powder, 10 to 15 parts of fish bone powder, 8 to 10 parts of α-starch, 5 to 10 parts of spirulina powder, 15 to 33 parts of microbial source raw materials, 2 to 4 parts of inorganic raw materials, and 1 to 2 parts of synthetic raw materials.

[0012] Preferably, the microbial source raw materials include the following raw materials in parts by weight: 10 to 20 parts of threonine bacterial protein, 2 to 5 parts of fermented soybean meal, and 3 to 8 parts of chlorella powder.

[0013] Preferably, the synthetic raw materials include the following raw materials in parts by weight: 0.5 to 1 part of gallnut extract and 0.5 to 1 part of curcumin.

[0014] Preferably, the inorganic raw materials include the following raw materials in parts by weight: 1 to 2 parts of minerals and 1 to 2 parts of salt.

[0015] A method for preparing ecological blue crab drawing compound feed comprises the following steps:

[0016] Step 1: Raw material pretreatment: sieve the fish fillet powder and rice bran separately to remove large particles; dissolve the synthetic raw materials and inorganic raw materials separately;

[0017] Step 2: Mix the raw materials: add fish fillet powder, rice bran, shrimp head powder / shell powder, fish bone powder, and threonine bacterial protein into a mixer in sequence and stir until uniform;

[0018] Add α-starch, spirulina powder, fermented soybean meal, and chlorella powder weighed according to percentage and stir again until evenly mixed;

[0019] Mixing the synthetic raw materials and the dissolved liquid of the inorganic raw materials in the form of spraying;

[0020] Step 3: Granulation: The material mixed in step 2 is evenly fed into the granulator through the feeder for granulation to form granular feed;

[0021] Step 4: Drying: Transfer the pelleted feed to a hot air circulation dryer until the moisture content of the pelleted feed drops to 12% or below.

[0022] Preferably, the gallnut extract weighed in parts by weight is added to water at a weight ratio of 1:5 to dissolve, and then curcumin is dissolved in ethanol at a ratio of 1:1 and added to water for dilution, and the water temperature for dissolution is controlled at 40-60°C.

[0023] Preferably, the minerals and salt are dissolved separately.

[0024] Preferably, in step 2, the time interval between each addition of α-starch, spirulina powder, fermented soybean meal, and chlorella powder is not less than 2 minutes.

[0025] When using, follow the steps below to prepare:

[0026] Step S1, weighing the particles prepared in step 4, adding liquid according to the weight ratio, and then stirring thoroughly;

[0027] Step S2, the materials mixed evenly in step S1 are fed evenly into a wire drawing feed machine through a feeder to form feed.

[0028] Preferably, the liquid in step S1 is water, fish oil, fish paste, or any one or more combinations thereof.

[0029] Beneficial effects

[0030] The feed of the present invention provides comprehensive nutrition required for the growth of blue crabs, including protein, carbohydrates, fat, vitamins and minerals, by scientifically proportioning multiple raw materials such as fish fillet powder, rice bran, shrimp head powder / shell powder, and fish bone powder.

[0031] The addition of microbial raw materials (threonine bacterial protein, fermented soybean meal, and chlorella powder) further enriches the amino acid composition and bioactive substances of the feed, which helps to improve the intestinal health and immunity of blue crabs;

[0032] The addition of bioactive substances such as spirulina powder, gallnut extract and curcumin significantly enhanced the immunity of mud crabs and improved their disease resistance.

[0033] Ingredients such as phycocyanin and β-carotene in spirulina powder, as well as chlorophyll and carotenoids in chlorella powder, help improve the meat quality of blue crabs, making them more delicious. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] The present invention provides a technical solution for an ecologically simulated blue crab drawing feed, comprising the following raw materials in parts by weight:

[0036] Basic ingredients: fish fillet powder: 30-40 parts; rice bran: 15-25 parts; shrimp head powder / shell powder: 10-15 parts; fish bone powder: 10-15 parts; α-starch: 8-10 parts; spirulina powder: 5-10 parts;

[0037] Microbial raw materials (15-33 parts in total): 10-20 parts of threonine bacterial protein; 2-5 parts of fermented soybean meal; 3-8 parts of chlorella powder

[0038] Inorganic raw materials (2-4 parts in total): 1-2 parts minerals; 1-2 parts salt

[0039] Synthetic raw materials (1-2 parts in total): 0.5-1 part of gallnut extract; 0.5-1 part of curcumin.

[0040] Fish fillet meal, as the primary protein source, is rich in essential amino acids and trace elements required for the growth of mud crabs. Its high protein and low fat content is well-suited to the carnivorous nature of mud crabs, helping to promote rapid growth and muscle development. The 30-40 serving ratio is designed to tailor protein intake to the different growth stages and culture environments of mud crabs. Juvenile crabs require higher protein levels to support rapid growth, so the ratio can be adjusted toward 40 servings. This can be reduced to 30 servings for adult crabs to avoid excess protein and environmental pollution.

[0041] Rice bran provides a rich source of carbohydrates and dietary fiber, serving as a vital source of energy for mud crabs. Furthermore, the B vitamins in rice bran contribute to the crab's metabolism and nervous system function. The 15-25 part rice bran ratio considers the crab's energy needs and the cost-effectiveness of the feed. During growth stages when energy requirements are high, the rice bran ratio can be increased appropriately; during periods of relatively stable energy requirements, the rice bran ratio can be reduced to optimize the overall nutritional profile of the feed.

[0042] Shrimp head and shell powders are rich in minerals such as calcium and phosphorus, as well as chitin, which plays a key role in the growth and hardness of mud crab shells. The chitin in shrimp shell powder also boosts the crab's immunity and disease resistance. A 10-15 part ratio ensures the crab receives sufficient minerals and chitin to support normal shell growth and renewal. The ratio can be increased during periods of active shell growth, while it can be reduced during slower growth periods.

[0043] Fish bone meal is a natural source of calcium and phosphorus, effectively supplementing the mineral needs of mud crabs during their growth. The collagen in fish bone meal also contributes to the toughness and elasticity of the mud crab's shell, improving its impact resistance. Similar to shrimp head and shell meal, a 10-15 part ratio is used to ensure the mud crabs receive adequate minerals and collagen. The ratio of fish bone meal can be adjusted appropriately depending on the growth stage of the mud crab and the breeding environment.

[0044] α-starch acts as a binder, increasing the viscosity and formability of the feed, making it less likely to scatter in water and improving feed utilization. It also provides a certain amount of energy for the mud crabs, facilitating digestion and absorption. The 8-10 parts ratio ensures good formability and viscosity while preventing excessive starch from causing digestive problems for the mud crabs. The α-starch ratio can be adjusted appropriately based on the feed's formability requirements and the mud crabs' digestive capacity.

[0045] Spirulina powder is rich in protein, vitamins, minerals, and various bioactive substances, such as phycocyanin and beta-carotene. These ingredients can significantly enhance the immune system of mud crabs, promote healthy growth, and improve meat quality. A 5-10 part spirulina powder ratio is designed to provide comprehensive nutritional support for mud crabs while avoiding excessive spirulina powder that can lead to increased feed costs. The spirulina powder ratio can be adjusted appropriately based on the growth needs of the mud crabs and feed costs.

[0046] Threonine bacterial protein is a high-quality protein obtained through microbial fermentation. Its balanced amino acid profile makes it easily digestible and absorbable by mud crabs. Furthermore, the beneficial metabolites produced during microbial fermentation promote the crab's intestinal health. A 10-20 part ratio is designed to provide the mud crab with ample high-quality protein while leveraging the beneficial effects of microbial fermentation. The ratio can be increased during periods of vigorous growth, while it can be reduced during slower growth periods.

[0047] Fermented soybean meal undergoes microbial fermentation, removing anti-nutritional factors and improving protein digestibility and utilization. Furthermore, the beneficial microorganisms produced during the fermentation process improve the intestinal flora of mud crabs and promote their healthy growth. A feed ratio of 2 to 5 parts per 100g of fermented soybean meal is designed to provide the appropriate amount of fermented soybean meal to supplement the crab's protein needs and promote intestinal health. The proportion of fermented soybean meal can be adjusted appropriately based on the crab's growth stage and feed costs.

[0048] Chlorella powder is rich in protein, vitamins, minerals, and various bioactive substances, such as chlorophyll and carotenoids. These ingredients can enhance the immune system of mud crabs, improve their disease resistance, and promote their growth and reproduction. A 3-8 serving ratio is designed to provide comprehensive nutritional support for mud crabs while leveraging the bioactive properties of chlorella powder. The ratio of chlorella powder can be adjusted appropriately based on the growth needs of the mud crabs and feed costs.

[0049] Minerals, such as calcium, phosphorus, and magnesium, are essential nutrients for the growth of mud crabs. These elements play an important role in skeletal growth, shell formation, and maintaining physiological functions. A 1-2 part ratio is designed to ensure adequate mineral support for mud crabs. The mineral ratio can be adjusted appropriately based on the growth stage and culture environment of the mud crab to meet its needs at different stages of growth.

[0050] Salt provides blue crabs with the necessary sodium and chloride ions to maintain electrolyte balance and osmotic pressure. A moderate amount of salt can also stimulate the crab's appetite and promote digestion and absorption. The 1-2 part salt ratio ensures that blue crabs receive the appropriate amount of salt. Too much salt can cause an osmotic imbalance in the blue crab's body, affecting its healthy growth; too little salt may not meet its physiological needs. Therefore, the salt ratio must be adjusted appropriately based on the blue crab's growth needs and the culture environment.

[0051] Gallnut extract has antibacterial and anti-inflammatory biological activities, which can enhance the immunity of blue crabs and improve their disease resistance. At the same time, gallnut extract can also promote wound healing and tissue repair in blue crabs. The ratio range of 0.5 to 1 parts is designed to provide blue crabs with an appropriate amount of gallnut extract support. Too much gallnut extract may lead to increased feed costs; too little gallnut extract may not fully exert its biological activity. Therefore, the ratio of gallnut extract needs to be appropriately adjusted according to the growth needs of blue crabs and feed costs.

[0052] Curcumin possesses multiple biological activities, including antioxidant, anti-inflammatory, and antibacterial properties, significantly enhancing the immune system and disease resistance of mud crabs. It also promotes digestion, absorption, and growth and development. Similar to gallnut extract, the 0.5-1 part ratio is designed to provide the appropriate amount of curcumin for mud crabs. The curcumin ratio can be adjusted appropriately based on the growth needs of the mud crabs and feed costs.

[0053] A method for preparing an ecological blue crab drawing feed comprises the following steps:

[0054] Step 1: Raw material pretreatment:

[0055] Sieve the fish fillet powder and rice bran separately to remove large particles of impurities;

[0056] The synthetic raw materials (gallic nut extract, curcumin) and inorganic raw materials (minerals, salt) are dissolved separately.

[0057] The specific dissolution method is:

[0058] The gallnut extract was added into water at a weight ratio of 1:5 and dissolved;

[0059] Dissolve curcumin in ethanol at a ratio of 1:1, then dilute it in the above water. The dissolution water temperature should be controlled at 40-60°C.

[0060] Minerals and salt can be dissolved separately. Alternatively, you can directly purchase the corresponding solutions.

[0061] Step 2: Mix the raw materials:

[0062] Add the pre-treated fish fillet powder, rice bran, shrimp head powder / shell powder, fish bone powder, and threonine bacterial protein into the mixer in sequence and stir until evenly mixed;

[0063] Then add α-starch, spirulina powder, fermented soybean meal, and chlorella powder weighed according to percentage, adding each time interval not less than 2 minutes, and continue stirring until uniform;

[0064] Finally, the pretreated synthetic raw materials and the dissolved liquid of the inorganic raw materials are added into the mixer in the form of spraying to participate in the final mixing.

[0065] Step 3: Granulation:

[0066] The mixed materials are evenly fed into the pelletizer through the feeder for pelleting to form granular feed.

[0067] Step 4: Drying:

[0068] The pelleted feed is transferred to a hot air circulation dryer and dried until the moisture content is reduced to 12% or below. A high moisture content can easily cause the feed to mold, affecting storage and use; a low moisture content can make the feed brittle and easily break, so maintaining a moisture content of 12% is ideal.

[0069] Feed preparation method

[0070] When in use, the prepared pelleted feed can be further formulated by the following steps:

[0071] Step S1, weighing the particles prepared in step 4, adding liquid according to the weight ratio, and then stirring thoroughly;

[0072] Step S2: The evenly mixed material is evenly fed into a drawing feed machine through a feeder to form the final required drawing feed.

[0073] Example 1

[0074] Basic ingredients: 35 parts of fish fillet powder; 20 parts of rice bran; 12 parts of shrimp head powder / shrimp shell powder; 12 parts of fish bone powder; 9 parts of α-starch; 7 parts of spirulina powder.

[0075] Microbial source raw materials: 15 parts of threonine bacterial protein; 3 parts of fermented soybean meal; 5 parts of chlorella powder.

[0076] Inorganic raw materials: 1.5 parts of minerals; 1.5 parts of table salt.

[0077] Synthetic raw materials: 0.7 parts of gallnut extract and 0.7 parts of curcumin.

[0078] The raw materials in the above-mentioned parts by weight are processed using a method for preparing an ecological blue crab drawing feed to obtain the particles prepared in step four.

[0079] When in use, add water and fish oil, wherein the water added is 30 parts by weight of the total mass of the prepared particles, and the fish oil added is 5 parts by weight of the total mass of the prepared particles, and then stir evenly. Then, the mixture is evenly fed into a wire drawing feed machine through a feeder to form feed.

[0080] Juvenile crabs require higher protein intake to support their rapid growth and muscle development, so the fish fillet powder ratio tends to be higher (35 parts out of 30-40 parts).

[0081] Rice bran (20 servings): provides rich carbohydrates and dietary fiber, which are important sources of energy metabolism and meet the high energy needs of young crabs.

[0082] Shrimp head powder / shrimp shell powder (12 parts) and fish bone powder (12 parts): Rich in minerals such as calcium and phosphorus, they help the growth and hardness of young crab shells.

[0083] Spirulina powder (7 parts), threonine bacterial protein (15 parts): provide comprehensive nutritional support, enhance the immunity of young crabs and promote their healthy growth.

[0084] Synthetic raw materials (0.7 parts of gallnut extract and 0.7 parts of curcumin): have antibacterial and anti-inflammatory biological activities, and improve the disease resistance of young crabs.

[0085] Example 2

[0086] Basic ingredients: 30 parts of fish fillet powder; 25 parts of rice bran; 10 parts of shrimp head powder / shell powder; 15 parts of fish bone powder; 8 parts of α-starch; 10 parts of spirulina powder.

[0087] Microbial source raw materials: 10 parts of threonine bacterial protein; 5 parts of fermented soybean meal; 8 parts of chlorella powder.

[0088] Inorganic raw materials: 1.5 parts of minerals; 1.5 parts of table salt.

[0089] Synthetic raw materials: 0.7 parts of gallnut extract and 0.7 parts of curcumin.

[0090] The raw materials in the above-mentioned parts by weight are processed using a method for preparing an ecological blue crab drawing feed to obtain the particles prepared in step four.

[0091] When in use, add water and fish oil, wherein the water added is 20 parts by weight of the total mass of the prepared particles, and the fish oil added is 20 parts by weight of the total mass of the prepared particles, and then stir evenly. Then, the mixture is evenly fed into a wire drawing feed machine through a feeder to form feed.

[0092] Fish fillet powder (30 servings): Compared to the juvenile crab stage, the protein demand of the middle crab stage is slightly lower, but it still needs to be maintained at a high level to support its stable growth, so the ratio of fish fillet powder is adjusted to 30 servings.

[0093] Rice bran (25 parts): The energy demand of crabs in the middle stage is relatively stable, and the proportion of rice bran should be appropriately increased to optimize the cost-effectiveness of the feed.

[0094] Shrimp head powder / shell powder (10 parts) and fish bone powder (15 parts): continue to provide essential minerals and chitin to support the normal growth and renewal of the crab shell.

[0095] Spirulina powder (10 servings): Increase the proportion of spirulina powder to provide more comprehensive nutritional support and improve meat quality.

[0096] Microbial source raw materials (10 parts of threonine bacterial protein, 5 parts of fermented soybean meal, 8 parts of chlorella powder): promote the intestinal health of crabs through the beneficial effects of microbial fermentation.

[0097] Inorganic raw materials and synthetic raw materials are kept in appropriate proportions to meet the basic physiological needs of crabs and improve their disease resistance.

[0098] Example 3

[0099] Basic ingredients: 40 parts of fish fillet powder; 15 parts of rice bran; 15 parts of shrimp head powder / shrimp shell powder; 10 parts of fish bone powder; 10 parts of α-starch; 5 parts of spirulina powder.

[0100] Microbial source raw materials: 20 parts of threonine bacterial protein; 2 parts of fermented soybean meal; 3 parts of chlorella powder.

[0101] Inorganic raw materials: 2 parts minerals; 1 part table salt.

[0102] Synthetic raw materials: 1 part of gallnut extract; 0.5 part of curcumin.

[0103] The raw materials in the above-mentioned parts by weight are processed using a method for preparing an ecological blue crab drawing feed to obtain the particles prepared in step four.

[0104] When in use, add water, fish oil and fish paste, wherein the water added is 10 parts by weight of the total mass of the prepared particles, the fish oil added is 5 parts by weight of the total mass of the prepared particles, and the fish paste added is 30 parts by weight of the total mass of the prepared particles. Then stir evenly and then evenly feed the mixture into the drawing feed machine through the feeder to form feed.

[0105] Fish fillet powder, as the protein requirement of adult crabs is lower than that of juvenile crabs, but considering that adult crabs still need a certain amount of protein to support their physiological activities, and the ratio of fish fillet powder in this example is 40 parts, it can be regarded as meeting the basic needs while not reducing excessively to avoid affecting health. The actual adjustment idea is to reduce the high demand relative to the rapid growth period of juvenile crabs, but still maintain a high level.

[0106] Rice bran (15 parts): The energy demand of adult crabs is relatively stable, so the proportion of rice bran should be appropriately reduced to reduce feed costs.

[0107] Shrimp head powder / shrimp shell powder (15 parts) and fish bone meal (10 parts): The shell growth of adult crabs is relatively slow, and the mineral demand is slightly reduced, but the ratio of shrimp head powder / shrimp shell powder remains high to support shell maintenance, and the ratio of fish bone meal is appropriately reduced.

[0108] Spirulina powder (5 servings): The demand for comprehensive nutrition in adult crabs is slightly reduced, so the proportion of spirulina powder should be reduced accordingly.

[0109] Microbial source raw materials (20 parts of threonine bacterial protein, 2 parts of fermented soybean meal, and 3 parts of chlorella powder): The ratio of threonine bacterial protein is increased to supplement the high-quality protein that adult crabs may lack; the ratio of fermented soybean meal and chlorella powder is reduced, but still maintained in a certain amount to promote intestinal health.

[0110] Inorganic raw materials (2 parts of minerals, 1 part of table salt) and synthetic raw materials (1 part of gallnut extract, 0.5 part of curcumin): maintain an appropriate ratio to meet the basic physiological needs of adult crabs and improve disease resistance, while avoiding excessive amounts that lead to increased costs.

[0111] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are intended to be included therein.

[0112] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An ecological blue crab drawing feed, characterized by: The invention comprises the following raw materials in parts by weight: 30 to 40 parts of fish fillet powder, 15 to 25 parts of rice bran, 10 to 15 parts of shrimp head powder / shrimp shell powder, 10 to 15 parts of fish bone powder, 8 to 10 parts of α-starch, 5 to 10 parts of spirulina powder, 15 to 33 parts of microbial source raw materials, 2 to 4 parts of inorganic raw materials, and 1 to 2 parts of synthetic raw materials.

2. The ecological blue crab drawing feed according to claim 1, characterized in that: The microbial source raw materials include the following raw materials in parts by weight: 10 to 20 parts of threonine bacterial protein, 2 to 5 parts of fermented soybean meal, and 3 to 8 parts of chlorella powder.

3. The ecological blue crab drawing feed according to claim 1, characterized in that: The synthetic raw materials include the following raw materials in parts by weight: 0.5 to 1 part of gallnut extract and 0.5 to 1 part of curcumin.

4. The ecological blue crab drawing feed according to claim 1, characterized in that: The inorganic raw materials include the following raw materials in parts by weight: 1 to 2 parts of minerals and 1 to 2 parts of salt.

5. A method for preparing an ecological blue crab drawing feed, characterized by: The following steps are involved: Step 1: Raw material pretreatment: sieve the fish fillet powder and rice bran separately to remove large particles; dissolve the synthetic raw materials and inorganic raw materials separately; Step 2: Mix the raw materials: add fish fillet powder, rice bran, shrimp head powder / shell powder, fish bone powder, and threonine bacterial protein into a mixer in sequence and stir until uniform; Add α-starch, spirulina powder, fermented soybean meal, and chlorella powder weighed according to percentage and stir again until evenly mixed; Mixing the synthetic raw materials and the dissolved liquid of the inorganic raw materials in the form of spraying; Step 3: Granulation: The material mixed in step 2 is evenly fed into the granulator through the feeder for granulation to form granular feed; Step 4: Drying: Transfer the pelleted feed to a hot air circulation dryer until the moisture content of the pelleted feed drops to 12% or below.

6. The method for preparing an ecological blue crab drawing feed according to claim 5, characterized in that: The gallnut extract weighed in parts by weight was added to water at a weight ratio of 1:5 to dissolve, and then curcumin was dissolved in ethanol at a ratio of 1:1 and added to water for dilution. The water temperature for dissolution was controlled at 40-60°C.

7. The method for preparing an ecological blue crab drawing feed according to claim 5, characterized in that: Dissolve the minerals and salt separately.

8. The method for preparing an ecological blue crab drawing feed according to claim 5, characterized in that: In step 2, the α-starch, spirulina powder, fermented soybean meal, and chlorella powder are added later with the time interval of each addition not less than 2 minutes.

9. The method for preparing an ecological blue crab drawing feed according to claim 5, characterized in that: When using, follow the steps below to prepare: Step S1, weighing the particles prepared in step 4, adding liquid according to the weight ratio, and then stirring thoroughly; Step S2, the materials mixed evenly in step S1 are fed evenly into a wire drawing feed machine through a feeder to form feed.

10. The method for preparing the ecological blue crab drawing feed according to claim 9, characterized in that: The liquid in step S1 is water, fish oil, fish paste, or any one or more combinations thereof.