Fermented grain bait as well as preparation method and application thereof

Abstract

The invention discloses fermented grain bait as well as a preparation method and application thereof, and relates to the technical field of feed. The fermented grain bait comprises the following components: a fermented culture obtained by fermenting basic grain bait with a lactobacillus salivarius zymophyte liquid and homogenizing cockroaches, and an adhesive slurry obtained by uniformly mixing sunflower plate pectin powder, dried corn stigma, calcium chloride and water. The basic grain bait and the cockroach homogenate serve as main raw materials, the fermentation culture is obtained through fermentation of the lactobacillus salivarius zymophyte liquid, fish luring components in the fermentation culture are rich, the extremely strong stimulation effect on the taste sense and the smell sense of fishes is achieved, the fish luring effect is improved, and the number of times of biting and hooking is increased. In addition, the prepared bait has excellent atomization performance and hook holding performance, and the fishing efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of feed, and in particular to a fermented grain fish bait and a preparation method and application thereof. Background Art

[0002] Fish bait is a kind of bait used to catch fish. Its purpose is to lure fish to a specific water area or lure fish to take the bait. Traditional fish bait is made from animal and plant materials that are edible to fish, and is simply mixed and processed. For example, plant materials such as soybean meal, bran, millet and corn grits are used, and animal materials such as Antarctic shrimp meal, fish meal, fish oil are used, and other pigments and flavoring ingredients are added to mix. In order to further promote the full release of the flavor components of the various raw materials of the fish bait and enhance the attractant effect, attractants are usually added to the fish bait. Common attractants include betaine, complex amino acids, etc. In addition, the raw materials of the fish bait are fermented with yeast, Lactobacillus plantarum, etc. to promote the release of the flavor components of the raw materials of the fish bait to achieve a better attractant effect.

[0003] The atomization performance and hook holding performance of fish bait are also aspects that anglers are concerned about. Atomization performance refers to the phenomenon that after the bait enters the water and moves, the fine particles in the bait separate from the main body of the bait and gradually dissolve in the water, and form a fog-like belt from bottom to top in the movement trajectory of the fish hook. Good atomization effect can quickly spread the fish-attracting ingredients in the bait, expanding the fishing point and having a positive significance for attracting fish. Hook holding performance refers to the ability and attachment time of the bait on the hook, which is generally determined by the viscosity of the bait itself. Different from the fish-attracting level reflected by atomization, hook holding performance is reflected in the behavior of fishing. Atomization is luring, and hook holding is fishing. The combination of luring and fishing jointly promotes the improvement of fishing efficiency.

[0004] In summary, in order to further enhance the fish attracting and retaining effect of fish bait and improve the fishing effect, the present invention proposes a fermented grain fish bait and a preparation method and application thereof. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fermented grain fish bait and a preparation method and application thereof.

[0006] The present invention is achieved by the following technical solution, which comprises the following steps:

[0007] The first aspect of the present invention provides a fermented grain fish bait, the ingredients of which include a fermentation culture obtained by fermenting a basic grain bait and cockroach homogenate with Lactobacillus salivarius fermentation liquid, and an adhesive slurry obtained by mixing sunflower pectin powder, dried corn silk, calcium chloride and water.

[0008] As a further optimization scheme of the present invention, the basic food bait includes, by weight, 50-60 parts of soybean meal, 5-10 parts of oat flour, 5-10 parts of bran, 10-20 parts of kudzu root powder, 10-20 parts of corn flour, 5-10 parts of sesame meal and 4-6 parts of licorice.

[0009] As a further optimization scheme of the present invention, the mass ratio of the fermentation culture to the adhesive slurry is 1:0.6-1.0.

[0010] As a further optimization scheme of the present invention, the adhesive slurry includes, by mass, 70-80 parts of sunflower pectin powder, 10-20 parts of dried corn silk, 1-5 parts of calcium chloride and 100-120 parts of water.

[0011] As a further optimization scheme of the present invention, the fermentation culture includes, by weight, 5-10 parts of fermentation bacteria liquid, 100-150 parts of basic food bait, 20-30 parts of cockroach homogenate, 2-5 parts of fermentation additives and 100-150 parts of water.

[0012] The second aspect of the present invention provides an application of a fermented grain fish bait as described above in improving fishing effects, wherein the fishing effects are reflected in any one or more of the number of bait bites, the number of bait hooks, the atomization performance of the bait, or the hook-holding performance of the bait.

[0013] The third aspect of the present invention provides a method for preparing the fermented grain fish bait as described above, comprising the following steps:

[0014] (1) According to the formula, sunflower pectin powder, dried corn silk, calcium chloride and water are weighed and mixed to obtain a mixed slurry;

[0015] (2) inoculating Lactobacillus salivarius into an activation medium to obtain activated bacteria, selecting the activated bacteria and inoculating them into a bacterial fermentation medium for cultivation, and filtering to obtain a fermentation broth;

[0016] (3) mixing the fermentation bacterial liquid with the basic food bait, cockroach homogenate, fermentation aid and water according to the formula, performing fermentation culture to obtain a fermentation culture, and drying it for later use;

[0017] (4) The fermented culture obtained in step (3) is subjected to extrusion puffing treatment to obtain a primary puffed material. After cooling, half of the adhesive slurry obtained in step (1) is sprayed into the primary puffed material to obtain a primary mixed wet material. The mixed wet material is subjected to extrusion puffing to obtain a secondary puffed material. After cooling, the remaining amount of the adhesive slurry is sprayed into the secondary puffed material to obtain a secondary mixed wet material. The secondary mixed wet material is then subjected to mechanical extrusion processing and then dried to obtain the fermented grain fish bait.

[0018] As a further optimization scheme of the present invention, in the step (3), the fermentation temperature is 30-35° C. and the fermentation time is 24-48 h.

[0019] As a further optimization scheme of the present invention, in the step (4), the extrusion puffing is carried out using a twin-screw extruder, the puffing temperature is 100-120° C., the puffing pressure is 8-10 MPa, and the puffing time is 30-40 s.

[0020] As a further optimization scheme of the present invention, in the steps (3) and (4), the drying is carried out at a constant temperature of 40° C. so that the water weight percentage of the secondary mixed wet material after mechanical extrusion processing is less than 15%.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The present invention uses basic food bait and cockroach homogenate as main raw materials, and utilizes Lactobacillus salivarius fermentation liquid to ferment to obtain fermentation culture. The rich enzyme system produced during the fermentation process of Lactobacillus salivarius can degrade polysaccharides, proteins and other flavor substances in the raw materials to release rich fish-attracting ingredients, which has a strong stimulating effect on the taste and smell of fish, improves the fish-attracting effect, increases the number of bites and hooks, and improves the fishing efficiency.

[0023] (2) The adhesive slurry used in the present invention is composed of sunflower pectin powder, dried corn silk, calcium chloride and water as main raw materials. Sunflower pectin powder has good viscosity and dried corn silk is helpful to form a cross-linked "network structure" inside the bait when the adhesive slurry is sprayed onto the fermentation culture to prepare the bait, which helps the adhesion between the bait components and improves the hook-holding ability of the bait.

[0024] (3) The present invention integrates the time of adding the adhesive slurry into the two puffing processes of the fermentation culture, which helps to fully puff the raw materials while promoting the adhesion between the raw materials, optimizes the internal structure of the bait so that the bait has both excellent atomization and hook-holding properties, helps to release the attractant ingredients for a long time, achieves a better effect of attracting and retaining fish, and thereby increases the number of times the bait bites the hook and is hooked. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technicians in this field can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0026] 1. Reagents and Materials

[0027] Unless otherwise specified, the reagents and materials used in this example are commercially available products.

[0028] Lactobacillus plantarum ATCC 8014 and Lactobacillus salivarius ATCC 11741 were both obtained from Shanghai Collection Biotechnology Center.

[0029] The activation medium was a commercially available PDA medium, and the fermentation liquid medium was a commercially available NA liquid medium.

[0030] The preparation method of Lactobacillus salivarius fermentation broth is to inoculate Lactobacillus salivarius into PDA culture medium, activate and culture at 25°C until the number of viable bacteria reaches 10 10 / mL, pick the activated bacteria and inoculate them into NA liquid culture medium at a volume ratio of 5%, culture them at 30°C for 5 days, and filter to obtain the fermented bacterial liquid. The preparation method of cockroach homogenate is to add the living cockroaches into water at a volume ratio of 1:20, then crush and pulp them, and filter them to obtain the homogenate.

[0031] Example 1

[0032] The fermented food bait provided in this embodiment comprises the following steps:

[0033] (1) By weight, 80 parts of sunflower pectin powder, 10 parts of dried corn silk, 5 parts of calcium chloride and 120 parts of water were added to obtain an adhesive slurry.

[0034] (2) By weight, 50 parts of soybean meal, 10 parts of oatmeal, 5 parts of bran, 20 parts of kudzu root powder, 10 parts of corn flour, 5 parts of sesame meal and 6 parts of liquorice are mixed evenly to obtain a basic food bait for later use. Then, according to the formula, 5 parts of fermentation liquid, 150 parts of basic food bait, 20 parts of cockroach homogenate, 5 parts of fermentation additives and 100 parts of water are mixed evenly to obtain a mixture, the mixture is fermented and cultured at 35° C. for 24 hours to obtain a fermentation culture, and the water weight percentage of the secondary mixed wet material after mechanical extrusion granulation is lower than 15% at a constant temperature of 40° C. for later use.

[0035] (3) According to the mass ratio of fermentation culture to adhesive slurry of 1:0.6, the fermentation culture prepared in step (2) is put into a twin-screw extruder for primary expansion, the expansion temperature is 120°C, the expansion pressure is 8 MPa, and the expansion time is 30 s to obtain a primary expansion material. After cooling, half of the adhesive slurry obtained in step (1) is sprayed into the primary expansion material according to the formula amount to obtain a primary mixed wet material. The primary mixed wet material is put into a twin-screw extruder for secondary expansion to obtain a secondary expansion material. The expansion conditions are the same as the primary expansion. After cooling, the remaining formula amount of adhesive slurry is sprayed into the secondary expansion material to obtain a secondary mixed wet material. The secondary mixed wet material is then mechanically extruded and granulated. Finally, the water weight percentage of the secondary mixed wet material after mechanical extrusion granulation is reduced to less than 15% under a constant temperature of 40°C to obtain the fermented grain fish bait.

[0036] Example 2

[0037] The fermented food bait provided in this embodiment comprises the following steps:

[0038] (1) By weight, 70 parts of sunflower pectin powder, 20 parts of dried corn silk, 1 part of calcium chloride and 100 parts of water are mixed to obtain an adhesive slurry.

[0039] (2) According to the weight ratio, 60 parts of soybean meal, 5 parts of oatmeal, 10 parts of bran, 10 parts of kudzu root powder, 20 parts of corn flour, 10 parts of sesame meal and 4 parts of liquorice are mixed evenly to obtain a basic food bait for later use. Then, according to the formula, 10 parts of fermentation bacteria liquid, 100 parts of basic food bait, 30 parts of cockroach homogenate, 2 parts of fermentation additives and 150 parts of water are mixed evenly to obtain a mixture, the mixture is fermented and cultured at 30° C. for 48 hours to obtain a fermentation culture, and the water weight percentage of the secondary mixed wet material after mechanical extrusion granulation is lower than 15% at a constant temperature of 40° C. for later use.

[0040] (3) According to the mass ratio of the fermentation culture to the adhesive slurry of 1:1, the fermentation culture prepared in step (2) is put into a twin-screw extruder for primary expansion, the expansion temperature is 100°C, the expansion pressure is 10MPa, and the expansion time is 40s to obtain a primary expansion material, and after cooling, the adhesive slurry obtained in step (1) is sprayed into the primary expansion material according to half of the formula amount to obtain a primary mixed wet material. The primary mixed wet material is put into a twin-screw extruder for secondary expansion, and the expansion conditions are the same as the primary expansion to obtain a secondary expanded material. After cooling, the remaining formula amount of adhesive slurry is sprayed into the secondary expansion material to obtain a secondary mixed wet material, and then the secondary mixed wet material is mechanically extruded and granulated. Then, the water weight percentage of the mechanically extruded secondary mixed wet material is made less than 15% under a constant temperature of 50°C to obtain the fermented grain fish bait.

[0041] Example 3

[0042] The fermented food bait provided in this embodiment comprises the following steps:

[0043] (1) By weight, 75 parts of sunflower pectin powder, 15 parts of dried corn silk, 3 parts of calcium chloride and 110 parts of water were added to obtain an adhesive slurry.

[0044] (2) According to the weight ratio, 55 parts of soybean meal, 7.5 parts of oat flour, 7.5 parts of bran, 15 parts of kudzu root powder, 15 parts of corn flour, 7.5 parts of sesame meal and 5 parts of liquorice are mixed evenly to obtain a basic food bait, which is set aside. Then, according to the formula, 7.5 parts of fermentation liquid, 125 parts of basic food bait, 25 parts of cockroach homogenate, 3.5 parts of fermentation additives and 125 parts of water are mixed evenly to obtain a mixture, the mixture is fermented and cultured at 35° C. for 24 hours, and the fermentation culture is obtained by drying. The water weight percentage of the secondary mixed wet material after mechanical extrusion granulation is lower than 15% at a constant temperature of 40° C., which is set aside.

[0045] (3) The mass ratio of the fermentation culture to the adhesive slurry is 1:0.8 and the preparation process is the same as in Example 1.

[0046] Verification test

[0047] 1. In order to explore the influence of the composition of fish bait on the application effect of fermented grain fish bait, based on the composition of the fermentation culture disclosed in Example 1, the following comparative examples were set:

[0048] Comparative Example 1 is different from Example 1 in that: in the composition of the fermentation culture, the Lactobacillus plantarum fermentation liquid is used instead of the Lactobacillus salivarius fermentation liquid in the same mass fraction.

[0049] Comparative Example 2: The difference from Example 1 is that in the composition of the fermentation culture, the cockroach homogenate is replaced by the earthworm homogenate of the same mass.

[0050] Comparative Example 3: The difference from Example 1 is that, in the composition of the fermentation culture, Lactobacillus salivarius fermentation liquid is not added, and the same mass parts of basic food bait are used instead, that is, the fermentation culture is replaced by a mixture obtained by mixing 155 parts of basic food bait, 20 parts of cockroach homogenate, 5 parts of fermentation additives and 100 parts of water according to the formula and drying.

[0051] Comparative Example 4: The difference from Example 1 is that in the composition of the adhesive slurry, the sunflower pectin powder is replaced by the same mass portion of apple pectin powder.

[0052] Comparative Example 5: The difference from Example 1 is that in the composition of the adhesive slurry, dry corn silk is not added and is replaced by crushed corn silk powder in the same amount by weight.

[0053] Example 1 and Comparative Examples 1-5 were prepared according to the method for preparing fermented grain fish bait disclosed in Example 1 to obtain fish bait samples, which were respectively recorded as fish baits AF.

[0054] First, the application effects of baits AF were measured, and fishing tests were conducted using baits AE. In addition, commercially available Longwanghen brand fish bait was used as a control.

[0055] The test site is a fish pond in Feidong County, Hefei City, with an area of ​​5.74 mu and a stocking density of 100-120 per mu. The farmed fish are grass carp, bream, etc. The baits AE and the baits are put on the fish hooks in turn. After the routine preparation operations before the fishing test, the number of bites and hooks of each group within one hour are recorded respectively. During the operation of hooking and hanging baits, the timing is suspended. Three repetitions are performed, and the results are rounded. The statistical results are shown in Table 1.

[0056] Table 1. Results of fishing tests

[0057]

[0058]

[0059] From Table 1, it can be seen that compared with bait D which does not contain fermented Lactobacillus salivarius and has not undergone fermentation treatment, baits AC and EF have added fermented bacteria and undergone fermentation. The fermentation treatment promotes the decomposition of raw materials such as polysaccharides and proteins and the release of fish attracting ingredients, which has a strong stimulating effect on the taste and smell of fish, improves the fish attracting effect, increases the number of bites and hooks, and improves fishing efficiency.

[0060] Bait A uses fermented bacteria liquid of Lactobacillus salivarius to improve the attractant effect of bait compared to bait B using fermented bacteria liquid of Lactobacillus plantarum. By comparing bait A and bait C, it can be seen that the addition of cockroach homogenate in fish bait has the same attractant effect as traditional earthworms because of its rich protein, providing application prospects for the resource utilization of cockroaches. By comparing baits EF, it can be seen that the adjustment of the composition of the adhesive slurry has no significant effect on the overall attractant effect of the bait, which is equivalent to the attractant effect of bait A.

[0061] 2. In order to explore the influence of bait preparation technology on the application effect of fermented grain bait, the bait preparation technology was adjusted according to the following comparative proportion.

[0062] Comparative Example 6: The difference from Example 1 is that in step (3): the fermentation culture prepared in step (2) is put into a twin-screw extruder for primary expansion according to a mass ratio of the fermentation culture to the adhesive slurry of 1:0.6, the expansion temperature is 120°C, the expansion pressure is 8MPa, and the expansion time is 30s to obtain a primary expansion material, and after cooling, the adhesive slurry obtained in step (1) is sprayed into the primary expansion material to obtain a primary mixed wet material. The mixed wet material is put into a twin-screw extruder for secondary expansion, and the expansion conditions are the same as the primary expansion to obtain a secondary expansion material, and the secondary expansion material is granulated to obtain the fermented grain fish bait.

[0063] Comparative Example 7: The difference from Example 1 is that in step (3): the fermentation culture prepared in step (2) is put into a twin-screw extruder for primary expansion, the expansion temperature is 120°C, the expansion pressure is 8MPa, and the expansion time is 30s to obtain a primary expansion material, and after cooling, the adhesive slurry obtained in step (1) is sprayed into the primary expansion material according to the formula amount to obtain a primary mixed wet material. Then, the primary mixed wet material is mechanically extruded and granulated, and then, the water weight percentage of the secondary mixed wet material after mechanical extrusion and granulation is made less than 15% under a constant temperature of 40°C to obtain the fermented grain fish bait.

[0064] Comparative Example 8: The difference from Example 1 is step (3): the fermentation culture and the binding slurry are mixed in a mass ratio of 1:0.6 to obtain a mixed wet material, the mixed wet material is mechanically extruded and granulated, and then, the water weight percentage of the secondary mixed wet material after mechanical extrusion and granulation is reduced to less than 15% under a constant temperature of 40°C, so as to obtain the fermented grain fish bait.

[0065] Comparative Example 9: The difference from Example 1 lies in step (3): the fermentation culture and the adhesive slurry are mixed in a mass ratio of 1:0.6 to obtain a mixed wet material, the mixed wet material is put into a twin-screw extruder for puffing, the puffing temperature is 120°C, the puffing pressure is 8 MPa, the puffing time is 30 s, and the puffed material is granulated to obtain the fermented grain fish bait.

[0066] The fish baits prepared in Comparative Examples 6-9 were counted as fish bait HK.

[0067] The atomization performance and hook holding performance of baits A, EF and HK were tested respectively.

[0068] Atomization performance refers to the phenomenon that after the bait enters the water and moves, the fine particles in the bait separate from the main body of the bait, gradually dissolve in the water, and form a fog-like belt from bottom to top in the movement trajectory of the fishhook. Good atomization effect can quickly spread the fish-attracting ingredients in the bait, expanding the fishing point and having a positive significance for attracting fish. Hook-holding performance refers to the ability and duration of the bait to adhere to the hook. Generally, it is determined by the viscosity of the bait itself. Different from the fish-attracting level reflected by atomization, hook-holding performance is reflected in the behavior of fishing. Atomization is luring, and hook-holding is fishing. The combination of luring and fishing promotes the improvement of fishing efficiency.

[0069] The test method adopts laboratory test method to carry out the test.

[0070] Specifically, a 1m×1m×1m container was filled with water (the amount of water was at least half of the volume of the beaker), and the water was allowed to flow in the container at a flow rate of 0.2m / s. The baits were hooked up using fishing lines and hooks and placed in the container in a suspended state so that the baits were immersed in the water. The time when the baits of each group began to atomize was recorded, and the time from the time the baits entered the water to the time when they began to atomize, as well as the time from the time the baits dissolved to the time when the baits were separated from the hooks, was recorded. Five replicates were set for each experimental group. The results were averaged, with one decimal place retained. The statistical results are shown in Table 2.

[0071] Table 2. Test results of atomization performance and hook holding performance

[0072]

[0073] It can be seen from Table 2 that the ingredients and preparation process of the bait have a certain influence on the atomization performance and hook-holding performance of the bait. It can be seen from the table that bait A has a shorter atomization time and a longer hook-holding time, and can be quickly atomized and dissolved in water, which promotes the rapid release of fish attracting ingredients in the bait. At the same time, the bait has a long hook-holding time, which prolongs the dissolution time of the bait in water. The bait can continuously release the attracting ingredients during the slow dissolution process, retaining the fish for a long time.

[0074] The difference between bait EF and bait A lies in the adjustment of the adhesive slurry composition. From the data in the table, it can be seen that the addition of dried corn silk to the adhesive slurry helps to form a cross-linked "network" structure inside the bait when the adhesive slurry is sprayed on the fermented culture to prepare the bait, which helps to bond between the components and improve the hook-holding performance of the bait. In addition, the reason why bait A is better than bait E is speculated to be that the use of sunflower pectin instead of apple pectin makes the adhesive slurry have better viscosity, which in turn makes the prepared bait have better hook-holding performance.

[0075] The difference between bait HK and bait A lies in the different preparation processes. When preparing bait JK, the fermented culture and the adhesive slurry are directly mixed and then mechanically processed or puffed. From the results, its atomization performance and hook holding performance are not as good as bait A. Bait H and bait A are both puffed twice during preparation. The structure of the raw materials after puffing is more porous and fluffy. From the results in the table, both have good atomization performance, but the hook holding performance of bait H is correspondingly reduced. The hook holding performance of bait A is better than that of bait H because of the different timing of adding the adhesive slurry. Bait A dissolves the timing of adding the adhesive slurry between the two puffing treatments, which helps to fully puff the raw materials while promoting the adhesion between the raw materials, thereby making the bait have both excellent atomization and hook holding performance.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A fermented grain fish bait, characterized in that: The fermented grain fish bait comprises a fermented culture obtained by fermenting a basic grain bait with Lactobacillus salivarius fermented bacterial liquid and cockroach homogenate, and an adhesive slurry obtained by mixing sunflower pectin powder, dried corn silk, calcium chloride and water.

2. A fermented grain fish bait according to claim 1, characterized in that: The basic food bait comprises, by weight, 50-60 parts of soybean meal, 5-10 parts of oatmeal powder, 5-10 parts of bran, 10-20 parts of kudzu root powder, 10-20 parts of corn flour, 5-10 parts of sesame meal and 4-6 parts of liquorice.

3. A fermented grain fish bait according to claim 1, characterized in that: The mass ratio of the fermentation culture to the adhesive slurry is 1:0.6-1.

0.

4. A fermented grain fish bait according to claim 1, characterized in that: The adhesive slurry comprises, by weight, 70-80 parts of sunflower pectin powder, 10-20 parts of dried corn silk, 1-5 parts of calcium chloride and 100-120 parts of water.

5. The fermented grain fish bait according to claim 1, characterized in that: The fermentation culture comprises, by weight, 5-10 parts of fermentation bacterial liquid, 100-150 parts of basic food bait, 20-30 parts of cockroach homogenate, 2-5 parts of fermentation additives and 100-150 parts of water.

6. An application of the fermented grain bait as claimed in any one of claims 1 to 5 in improving fishing effect, characterized in that: The fishing effect is reflected in any one or more of the number of times the bait is bitten, the number of times the bait is hooked, the atomization performance of the bait, or the hook holding performance of the bait.

7. A method for preparing a fermented grain fish bait as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: (1) According to the formula, sunflower pectin powder, dried corn silk, calcium chloride and water are weighed and mixed to obtain a mixed slurry; (2) inoculating Lactobacillus salivarius into an activation medium to obtain activated bacteria, selecting the activated bacteria and inoculating them into a bacterial fermentation medium for cultivation, and filtering to obtain a fermentation broth; (3) mixing the fermentation bacterial liquid with the basic food bait, cockroach homogenate, fermentation aid and water according to the formula, performing fermentation culture to obtain a fermentation culture, and drying it for later use; (4) The fermentation culture obtained in step (3) is subjected to extrusion puffing treatment to obtain a primary puffed material. After cooling, half of the adhesive slurry obtained in step (1) is sprayed into the primary puffed material to obtain a primary mixed wet material. The mixed wet material is subjected to extrusion puffing to obtain a secondary puffed material. After cooling, the remaining amount of the adhesive slurry is sprayed into the secondary puffed material to obtain a secondary mixed wet material. The secondary mixed wet material is then mechanically extruded and dried to obtain the fermented grain fish bait.

8. The method for preparing a fermented grain fish bait according to claim 7, characterized in that: In the step (3), the fermentation temperature is 30-35° C. and the fermentation time is 24-48 hours.

9. The method for preparing fermented grain fish bait according to claim 7, characterized in that: In the step (4), the extrusion puffing is carried out using a twin-screw extruder, the puffing temperature is 100-120° C., the puffing pressure is 8-10 MPa, and the puffing time is 30-40 s.

10. The method for preparing fermented grain fish bait according to claim 7, characterized in that: In the steps (3) and (4), drying is carried out at a constant temperature of 40° C. to make the water weight percentage of the secondary mixed wet material after mechanical extrusion processing less than 15%.

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