Sectional type obstructing sausage-shaped feed for improving feeding efficiency of blue crabs

Abstract

The utility model relates to the technical field of aquaculture. A sectional type obstructing sausage-shaped feed for improving the feeding efficiency of blue crabs comprises a feed base body, the feed base body is of a sausage-shaped structure, the outer diameter of the feed base body is larger than 1 cm, and the axial length of the feed base body is larger than the radial length of the feed base body; the feed base body comprises a core nutrition layer, a feed base layer and an outer casing made of a waterproof breathable material which are sequentially arranged from inside to outside; the core nutrition layer is made of protein nutrients; the periphery of the feed base body is connected with a ribbon. The structure of the feed is optimized, so that the blue crabs can actively ingest the feed conveniently. The gradient distribution arranged inside and outside is beneficial to nutrient enrichment and absorption in the breeding period and the middle and later period of breeding of the blue crabs, and the outer casing is arranged and provided with the air holes, so that the feed is ensured to have better water resistance while food calling is realized.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture technology, specifically to feed. Background Technology

[0002] The vast majority of mud crab breeding uses live razor clams as feed. However, razor clams are expensive, of inconsistent quality, and prone to spoiling water, inevitably introducing a large number of pathogens and reducing the survival rate, development quality, and egg-carrying quality of mud crabs during the breeding period. Other mud crab farmers use frozen miscellaneous fish or even low-value shellfish to raise mud crabs during the breeding period. However, frozen fish have disadvantages such as high cost, easy spoilage of water, and carrying pathogens. Low-value shellfish are nutritionally deficient and also prone to spoilage of water and carrying pathogens, neither of which conforms to the development direction of sustainable aquaculture. A highly efficient fattening feed that can replace live razor clams has not yet been developed.

[0003] Furthermore, in the aquaculture sector, common feed forms in China include powder, granules, and flakes, which satisfy the needs of most aquaculture species. However, conventional feeds cannot meet the feeding and development requirements of mud crabs during their breeding period. On the one hand, adult mud crabs have heavy claws, making it very difficult for them to pick up granular or small-diameter formulated feeds. Moreover, uncoated formulated feeds soften and break easily when exposed to water, making them extremely difficult to pick up or remove. This is because the feed is made by extrusion, resulting in a short formation time in water, making it easily crushed by the crab's claws, leading to low utilization and significant nutrient loss. Large, compressed granular feeds are even more prone to breakage due to limitations in processing equipment. On the other hand, mud crabs have low feeding efficiency and slow feeding reactions. The dissolution rate of traditional uncoated feeds in water is much faster than the feeding reaction time of mud crabs.

[0004] Many domestic crab farmers have tried feeding mud crabs with pelleted feed, but the crabs barely eat it, resulting in very poor results. Therefore, how to break through traditional production processes and get mud crabs in their breeding season to actively and willingly consume artificial feed is one of the problems that mud crab farming technicians are hoping to solve. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a segmented, barrier-type sausage-shaped feed to improve the feeding efficiency of mud crabs, thereby solving at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides a segmented barrier sausage-shaped feed to improve the feeding efficiency of mud crabs, comprising a feed matrix, characterized in that the feed matrix has a sausage-shaped structure, the outer diameter of the feed matrix is ​​greater than 1 cm, and the axial length of the feed matrix is ​​greater than the radial length.

[0007] The feed matrix includes, from the inside out, a core nutrient layer, a feed base layer, and an outer casing made of waterproof and breathable material;

[0008] The core nutrient layer is made of protein nutrients;

[0009] The feed substrate is attached to a ribbon for easy handling.

[0010] This invention optimizes the structure of the feed, making it easier for mud crabs to actively consume it.

[0011] The gradient distribution inside and outside the feed is beneficial for the enhanced absorption of nutrients during the breeding and later stages of crab farming. The outer casing, with its ventilation holes, attracts feed while ensuring good water resistance. The core nutrient layer contains the most easily soluble and lost protein nutrients, which will not dissolve when not ingested. These nutrients are then actively picked up and consumed by the crabs, maximizing protein utilization. The gradient release of nutrients with different solubilities ensures a more comprehensive range of nutrients in the feed, preventing loss and improving nutrient utilization.

[0012] By adding a ribbon, it is easier to pick up, put down, weigh, and count the amount of food consumed.

[0013] More preferably, a lipid transition layer is sandwiched between the core nutrient layer and the feed base layer.

[0014] The lipid transition layer specifically addresses the difficulty of adding fatty acids to existing compound feeds, thus enriching the supplementation of lipid nutrition.

[0015] More preferably, the lipid transition layer is made of fatty acids.

[0016] More preferably, the lipid transition layer is a fatty acid capsule;

[0017] The feed matrix includes ring-shaped feeds arranged sequentially along the axial direction, with gaps between adjacent ring-shaped feeds.

[0018] This facilitates the movement of the ring-shaped feed relative to the core nutrient layer, breaking through the lipid transition layer and allowing fatty acids to penetrate into the feed matrix and core nutrient layer, thus improving fatty acid absorption.

[0019] More preferably, the lipid transition layer is cotton thread impregnated with a fatty acid solution;

[0020] The cotton thread is provided with at least three strands;

[0021] The outer side of the core nutrient layer is provided with a limiting groove for embedding the cotton thread.

[0022] This facilitates the fixation of the lipid transition layer, and at the same time, the fixation of the lipid transition layer facilitates the penetration of fatty acid solution from the cotton thread inside and out.

[0023] More preferably, the ribbon is fixed at the junction of adjacent annular feeds.

[0024] More preferably, two ribbons are provided, and the two ribbons are fixed at both ends along the axial direction of the feed matrix.

[0025] Alternatively, the ribbon may be arranged along the axial direction of the feed matrix.

[0026] More preferably, the outer side of the feed matrix is ​​covered with an attractant layer formed by an attractant.

[0027] More preferably, the outer side of the feed base layer is covered with an attractant layer formed by an attractant.

[0028] More preferably, the axial length of the feed matrix is ​​3 to 6 times the outer diameter.

[0029] More preferably, the volume of the feed base layer accounts for 5-10% of the volume of the feed matrix.

[0030] The volume of the lipid transition layer is 25%-45% of the volume of the feed matrix.

[0031] The core nutrient layer occupies 50-65% of the volume of the feed matrix.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] This invention optimizes the structure of the feed, making it easier for mud crabs to actively feed while preventing the feed layer from dissolving too quickly in the water through segmented barriers. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is another structural schematic diagram of the present invention.

[0036] In the diagram: 1 is the core nutrient layer, 2 is the lipid transition layer, 3 is the feed base layer, 4 is the outer casing, and 5 is the ribbon. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] See Figure 1 as well as Figure 2Specific Embodiment 1: A segmented barrier sausage-shaped feed to improve the feeding efficiency of mud crabs, comprising a feed substrate with a sausage-shaped structure, an outer diameter greater than 1 cm, and an axial length greater than the radial length; the feed substrate includes a core nutrient layer 1, a feed base layer 3, and an outer casing 4 made of waterproof and breathable material arranged sequentially from the inside out; the core nutrient layer 1 is made of protein nutrients; and a ribbon 5 is attached to the periphery of the feed substrate. This invention optimizes the structure of the feed, facilitating active feeding by mud crabs.

[0039] The gradient distribution inside and outside facilitates the absorption of nutrients during the breeding and later stages of crab farming. The gradient release of nutrients with different solubilities ensures that the feed contains a more comprehensive range of nutrients and is less prone to loss, thereby improving nutrient utilization. The core nutrient layer 1 contains the most easily soluble and lost protein nutrients, which will not dissolve when not ingested. After the crabs actively crush and pick them up, they will be ingested first, maximizing the utilization rate of protein.

[0040] Protein nutrients come from the meat of sandworms, shellfish, or fish and shrimp, after sterilization and disinfection. Sandworms are an important protein source for mud crabs in nature. Shellfish such as blue clams, clams, oysters, and cockles have tender meat and high protein content, making them a favorite food of mud crabs. Their rich protein content meets the needs of mud crabs' rapid growth. Fish and shrimp are good sources of protein for mud crabs. Common small fish such as sardines and mackerel, as well as mysids, are not only rich in protein but also contain other nutrients that contribute to the healthy growth of mud crabs.

[0041] Protein nutrients can also come from high-protein seaweeds such as kelp, agar, and wakame. In natural marine environments, algae can also be a component of the mud crab's diet. At the same time, in artificial breeding environments, an appropriate amount of algae can improve water quality and provide some nutrition for the mud crabs.

[0042] See Figure 1 A lipid transition layer 2 is sandwiched between the core nutrient layer 1 and the feed base layer 3. This lipid transition layer specifically addresses the difficulty of adding fatty acids to existing compound feeds, enriching the supply of lipid nutrients. The lipid transition layer is made of fatty acids.

[0043] See Figure 2The lipid transition layer 2 can be a fatty acid capsule; the feed matrix 3 includes annular feeds arranged sequentially along the axial direction, with gaps between adjacent annular feeds. This facilitates the movement of the annular feeds relative to the core nutrient layer, breaking through the lipid transition layer and allowing fatty acids to permeate into the feed matrix 3 and the core nutrient layer 1, thus improving fatty acid absorption. A ribbon is fixed at the connection point of adjacent annular feeds. Alternatively, the lipid transition layer can be cotton thread impregnated with a fatty acid solution; at least three cotton threads are provided; a limiting groove for embedding the cotton thread is opened on the outer side of the core nutrient layer. This facilitates the fixation of the lipid transition layer, and simultaneously, the fixation of the lipid transition layer facilitates the permeation of the fatty acid solution on the cotton thread inside and outside.

[0044] The material of feed base layer 3 is traditional roughage. This application will not go into detail.

[0045] The outer side of the feed matrix is ​​covered with an attractant layer formed by an attractant agent. By setting an outer casing 4 with air holes, the feed is attracted to food while ensuring good water resistance.

[0046] The outer casing 4 can be made of either animal or plant-based materials. Animal casings can be pig or sheep intestines. They have good edibility and adhesive properties, allowing them to be torn open by the crab and eaten using its claws. They are also waterproof and breathable. Plant-based casings can be sodium alginate and guar gum plant-based casings. They are also edible and prioritize environmental friendliness and cost-effectiveness.

[0047] The addition of ribbons 5 facilitates the handling, weighing, and recording of feed intake. Two ribbons 5 are provided, fixed at both ends along the axial direction of the feed substrate. Alternatively, the ribbons 5 can be arranged along the axial direction of the feed substrate.

[0048] The feed matrix has a large diameter, with an outer diameter greater than 1 cm. Preferably, the outer diameter is less than 5 cm. The axial length of the feed matrix is ​​3 to 6 times the outer diameter, which conforms to the picking and grasping feeding habits of mud crabs. The volume of the feed base layer accounts for 5-10% of the volume of the feed matrix. The volume of the lipid transition layer accounts for 25%-45% of the volume of the feed matrix. The volume of the core nutrient layer accounts for 50-65% of the volume of the feed matrix. This proportion meets the nutritional requirements of mud crabs.

[0049] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A segmented barrier sausage feed for improving the feeding efficiency of blue crabs, comprising a feed matrix, characterized in that, The feed substrate is in a sausage-shaped structure, the outer diameter of the feed substrate is greater than 1 cm, and the axial length of the feed substrate is greater than the radial length; The feed substrate comprises a core nutrition layer, a feed substrate layer and an outer casing made of waterproof and breathable material arranged in sequence from inside to outside; The material of the core nutrition layer is protein nutrients; The periphery of the feed substrate is connected with a ribbon.

2. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs according to claim 1, wherein: The core nutrition layer and the feed substrate layer are clamped with a lipid transition layer.

3. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs according to claim 2, wherein: The material of the lipid transition layer is fatty acid.

4. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 2, wherein: The lipid transition layer is a fatty acid capsule; The feed substrate comprises annular feedings arranged in sequence along the axial direction, and gaps exist between adjacent annular feedings.

5. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 2, wherein: The lipid transition layer is a cotton thread soaked with a fatty acid solution; The cotton thread is provided with at least three; The outer side of the core nutrition layer is provided with a limiting groove for embedding the cotton thread.

6. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 4, wherein: The ribbon is fixed at the connection of adjacent annular feedings.

7. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 1, wherein: The ribbon is provided with two, and the two ribbons are fixed at the two ends of the axial direction of the feed substrate.

8. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 1, wherein: The outer side of the feed substrate is covered with an attractant layer formed by an attractant.

9. The segmented barrier sausage feed for enhancing the feeding efficiency of blue crabs of claim 1, wherein: The axial length of the feed substrate is 3-6 times the outer diameter.

10. The segmented barrier sausage-shaped feed for improving the feeding efficiency of blue crabs according to claim 2, characterized in that: The volume of the feed substrate layer is 5-10% of the volume of the feed substrate; The volume of the lipid transition layer is 25%-45% of the volume of the feed substrate; The volume of the core nutrition layer is 50-65% of the volume of the feed substrate.

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