Australian freshwater lobster egg anti-sticking liquid and application thereof

Abstract

The invention discloses Australian freshwater lobster egg anti-sticking liquid and application thereof, and relates to the field of lobster culture, the Australian freshwater lobster egg anti-sticking liquid comprises 0.5%-1.5% of albumin, 5%-15% of soybean lecithin, 5%-15% of vegetable oleic acid, and the balance of water. According to the shrimp egg anti-sticking liquid provided by the invention, attachment feet of female shrimps cannot be adhered to discharged fertilized eggs in a soaking manner, so that the fertilized eggs of the female shrimps are separated from the female shrimps under the condition of no mechanical or manual strong intervention, and the fertilized eggs are collected and then are subjected to centralized incubation, so that the survival rate of the female shrimps is improved. The situation that oocyte membranes of fertilized eggs are damaged due to territory consciousness when the Australian freshwater lobsters are fed in a concentrated mode can be effectively avoided, and therefore the hatching rate of the fertilized eggs is increased. The invention further provides a breeding device, under the cooperation of water flow, gravity and anti-sticky liquid, fertilized eggs can be separated from female shrimps, the separated fertilized eggs can be automatically collected in a centralized mode, manpower is saved, the time for the parent shrimps to stay in a temporary breeding pond can be shortened, and the workload of the hatching process is reduced through unified and centralized hatching.

Description

Technical Field

[0001] The present invention relates to the field of lobster farming, and particularly to a mucus prevention agent for Australian freshwater lobster eggs and its application. Background Art

[0002] The reproduction of Australian freshwater lobsters is relatively special. They have the habit of carrying eggs on their abdomens. Their egg-carrying capacity is relatively small, generally ranging from 200 to 1000 eggs. However, due to cannibalism, natural death and other reasons, generally only dozens of offspring can be finally bred by one broodstock, and at most only one or two hundred fry. Therefore, the large-scale production of fry is restricted. Moreover, Australian freshwater lobsters have a strong territorial awareness. It is common for them to fight and have broken limbs. When the broodstock dies, the eggs also die. During the reproduction process, only the density of the broodstock can be reduced, and the broodstock needs to be removed in time after hatching. In addition, the hatching time of the eggs is not uniform, and it is difficult to uniformly remove the broodstock, which puts higher requirements on facilities and management. Summary of the Invention

[0003] In view of the above deficiencies of the prior art, the present invention provides a mucus prevention agent for Australian freshwater lobster eggs and its application, which can reduce the loss of lobster eggs during intensive farming.

[0004] To achieve the above invention object, the technical solutions adopted by the present invention are as follows:

[0005] Provide a mucus prevention agent for Australian freshwater lobster eggs, which comprises 0.5% - 1.5% albumin, 5% - 15% soy lecithin and 5% - 15% oleic acid, and the rest is water.

[0006] A mucus prevention agent for Australian freshwater lobster eggs, which comprises 0.5% - 1.5% albumin, 5% - 15% soy lecithin and 5% - 15% vegetable oleic acid, and the rest is water.

[0007] Further, it comprises 1% albumin, 9% soy lecithin and 9% vegetable oleic acid, and the rest is water.

[0008] The present invention also provides an application of the above-mentioned mucus prevention agent for Australian freshwater lobster eggs, which is used to attach to the appendages of fertilized Australian freshwater female lobsters to prevent the fertilized eggs discharged by the female lobsters from adhering to the appendages of the female lobsters, facilitating the detachment of the fertilized eggs from the female lobsters.

[0009] The present invention also provides a method for farming Australian freshwater lobsters using the above-mentioned mucus prevention agent, which comprises the following steps:

[0010] S1: Placing the fertilized female lobsters in a breeding pond containing the mucus prevention agent for normal breeding;

[0011] S2: Collecting the fertilized eggs that have detached from the female lobsters and fallen to the bottom of the breeding pond, and separately incubating the collected fertilized eggs artificially.

[0012] The present invention also provides a breeding device for Australian red claw crayfish, which includes a breeding pond filled with the above-mentioned anti-mucus for shrimp eggs. A filter screen with a pore size larger than that of the fertilized eggs and smaller than that of the crayfish is arranged in the breeding pond. A fertilized egg collection port is arranged at the bottom of the breeding pond, and the fertilized egg collection port is connected to a fertilized egg hatching pond.

[0013] Furthermore, it also includes a water flow collection component for collecting fertilized eggs in real time. The water flow collection component includes a water pump. The output end of the water pump is connected to the breeding pond through an anti-mucus inlet. The input end of the water pump is connected to a shrimp egg anti-mucus preparation pond; the anti-mucus inlet is located above the filter screen; the top end of the fertilized egg hatching pond is located below the filter screen.

[0014] Furthermore, the bottom of the breeding pond is funnel-shaped, and there are multiple anti-mucus inlets, and the multiple anti-mucus inlets are evenly distributed around the breeding pond in a circumferential manner.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention provides an anti-mucus for shrimp eggs, which can prevent the appendages of female shrimps from adhering to the discharged fertilized eggs through soaking, so that the fertilized eggs of female shrimps can be separated from the female shrimps without mechanical or artificial strong intervention. By collecting and centrally hatching the fertilized eggs, it can effectively avoid the damage of the egg membranes of fertilized eggs caused by territorial awareness during the centralized feeding of Australian red claw crayfish, thereby improving the hatching rate of fertilized eggs.

[0017] The present invention also provides a breeding device, which can realize the separation of fertilized eggs from female shrimps and automatically collect the separated fertilized eggs under the cooperation of water flow, gravity and anti-mucus, saving manpower, shortening the time of broodstock in the temporary breeding pond, and the unified centralized hatching also reduces the workload during the hatching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the breeding device for Australian red claw crayfish;

[0019] Figure 2 It is a top view structural diagram of the breeding pond;

[0020] Wherein, 1. Breeding pond, 2. Filter screen, 3. Fertilized egg collection port, 4. Fertilized egg hatching pond, 5. Water pump, 6. Anti-mucus inlet, 7. Shrimp egg anti-mucus preparation pond. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The specific embodiments of the present invention will be described below to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions created using the concept of the present invention are within the scope of protection.

[0022] Example 1

[0023] Food-grade albumin (98%) purchased from Kelelan (Shaanxi) Biotechnology Co., Ltd., food-grade soy lecithin (99%) from Anhui Weimao Biotechnology Co., Ltd., and food-grade oleic acid (99%) from Wuhan Kemic Pharmaceutical Technology Co., Ltd. were used to prepare 10 L of shrimp egg anti-mucus with different ratios. When preparing, tap water was used. For each ratio of the anti-mucus, female shrimps with eggs were immersed, and the immersion time was 5 - 10 min. The total number of fertilized eggs and the number of detached ones were counted, and the anti-adhesion rate was calculated as follows: anti-adhesion rate = number of detached fertilized eggs / (number of detached fertilized eggs + number of fertilized eggs adhering to the appendages). Each ratio was experimented three times, and the total number of detached fertilized eggs and the total number of fertilized eggs from the three experiments were used to calculate the desorption rate. The ratios and statistical results are shown in Table 1 below;

[0024] Table 1

[0025] Albumin Soybean lecithin Oleic acid Anti-adhesion rate Group 1 0.1％ 3％ 3% vegetable oleic acid 50.2％ Group 2 0.5％ 5％ 5% vegetable oleic acid 84.3％ Group 3 1％ 9％ 9% vegetable oleic acid 90.5％ Group 4 1.5％ 15％ 15% vegetable oleic acid 92.3％ Group 5 2％ 20％ 20% vegetable oleic acid 74.2％* Group 6 1.5％ 15％ 15% animal oleic acid 86.2％

[0026] As can be seen from Group 1 in Table 1, when the dosages of albumin, soy lecithin, and oleic acid in the anti-mucus are less than those given in the present invention, the fertilized eggs of female shrimps cannot be detached smoothly. From Groups 2 - 4, it can be seen that using the anti-mucus of the present invention can effectively make the fertilized eggs detach from the appendages of female shrimps.

[0027] From Groups 4 and 6, it can be seen that although the desorption rate can reach 86.2% when using animal oleic acid, it is worse than using vegetable oleic acid.

[0028] Among them, for the anti-mucus in Group 5, after the female shrimp was put in, the female shrimp struggled, which was inconvenient to operate and caused greater stimulation to the parent shrimp. Although the desorption rate was high, the cost was high, and the greater stimulation to the parent shrimp had a greater impact on the subsequent discharge and hatching of fertilized eggs.

[0029] Example 2

[0030] As Figure 1-2 shown, a breeding device for Australian freshwater crayfish includes a breeding pond 1 filled with the above-mentioned shrimp egg anti-mucus. A filter screen 2 with a pore size larger than that of fertilized eggs and smaller than that of crayfish is arranged in the breeding pond 1. A fertilized egg collection port 3 is arranged at the bottom of the breeding pond 1, and the fertilized egg collection port 3 is connected to a fertilized egg hatching pond 4.

[0031] It further includes a water flow collection component for collecting fertilized eggs in real time. The water flow collection component includes a water pump 5. The output end of the water pump 5 is connected to the breeding pond 1 through an anti-slime inlet 6. The input end of the water pump 5 is connected to a shrimp egg anti-slime preparation pond 7. The anti-slime inlet 6 is located above the filter screen 2. The top of the fertilized egg hatching pond 4 is located below the filter screen 2.

[0032] The bottom of the breeding pond 1 is funnel-shaped, and there are multiple anti-slime inlets 6. The multiple anti-slime inlets 6 are evenly distributed circumferentially around the breeding pond 1.

[0033] When the Australian freshwater crayfish is fertilized, the female shrimp is placed in the breeding pond 1 containing shrimp egg anti-slime. The breeding pond 1 serves as a temporary breeding pond. The fertilized female shrimp discharges fertilized eggs in the breeding pond 1. At this time, the shrimp egg anti-slime preparation pond 7 continuously prepares shrimp egg anti-slime, and the shrimp egg anti-slime is evenly introduced into the breeding pond 1 through the water pump 5. Under the gentle impact of the water flow, gravity, and the action of the shrimp egg anti-slime, the fertilized eggs discharged by the female shrimp fall towards the fertilized egg collection port 3 at the bottom of the breeding pond 1. The setting of the filter screen 2 prevents the female shrimp from passing through the filter screen 2, while the fertilized eggs are not affected. Due to the funnel-shaped bottom of the breeding pond 1, the fertilized eggs are naturally gathered together by the water flow and flow through the fertilized egg collection port 3 to the fertilized egg hatching pond 4. The whole process does not require manual or other mechanical intervention for collection. Driven by the gentle water flow, the fertilized eggs will not be damaged. When there are too many fertilized eggs and the fertilized egg collection port 3 is blocked, the water pump 5 stops working, and the introduction of shrimp egg anti-slime into the breeding pond 1 is suspended. Wait for the fertilized eggs to flow towards the fertilized egg hatching pond 4 under the action of gravity, and then turn on the water pump 5 after the blockage is solved. The fertilized egg hatching pond 4 creates an incubation environment and centrally incubates the collected fertilized eggs.

Claims

1. An anti-mucus for Australian freshwater crayfish eggs, characterized in that, It comprises 0.5% - 1.5% albumin, 5% - 15% soy lecithin and 5% - 15% oleic acid, with the balance being water.

2. The anti-mucus of Australian freshwater crayfish eggs according to claim 1, characterized in that, It comprises 0.5% - 1.5% albumin, 5% - 15% soy lecithin and 5% - 15% vegetable oleic acid, with the balance being water.

3. The anti-mucus of Australian red claw crayfish eggs according to claim 2, characterized in that, It comprises 1% albumin, 9% soy lecithin and 9% vegetable oleic acid, with the balance being water.

4. Use of the Australian freshwater crayfish eggs for preventing mucus as described in claim 1 or 2, characterized in that, It is used for attaching to the appendages of female Australian freshwater crayfish after fertilization, preventing the fertilized eggs discharged by the female shrimp from adhering to the appendages of the female shrimp, and facilitating the detachment of the fertilized eggs from the female shrimp.

5. A method for culturing Australian freshwater crayfish with anti-mucus according to claim 1 or 2, characterized in that, It includes the following steps: S1: Placing the fertilized female shrimp in a breeding pond containing anti-mucus for normal breeding; S2: Collecting the fertilized eggs that have detached from the female shrimp and fallen to the bottom of the breeding pond, and separately incubating the collected fertilized eggs artificially.

6. An aquaculture device for Australian freshwater crayfish, characterized in that, It includes a breeding pond (1), the breeding pond (1) is filled with the anti-mucus for shrimp eggs described in claim 1, a filter screen (2) with a pore size larger than the fertilized eggs and smaller than the crayfish is arranged in the breeding pond (1), a fertilized egg collection port (3) is arranged at the bottom of the breeding pond (1), and the fertilized egg collection port (3) is connected to a fertilized egg hatching pond (4).

7. The breeding device according to claim 6, characterized in that, It further includes a water flow collection component for collecting fertilized eggs in real time. The water flow collection component includes a water pump (5). The output end of the water pump (5) is connected to the breeding pond (1) through an anti-mucus inlet (6), and the input end of the water pump (5) is connected to an anti-mucus preparation pond (7) for shrimp eggs; the anti-mucus inlet (6) is located above the filter screen (2); the top end of the fertilized egg hatching pond (4) is located below the filter screen (2).

8. The breeding device according to claim 7, characterized in that, The bottom of the breeding pond (1) is funnel-shaped, and there are multiple anti-mucus inlets (6), and the multiple anti-mucus inlets (6) are evenly distributed in a circle around the breeding pond (1).

Images