A method for cultivating kelp seedlings

Abstract

This invention relates to the field of kelp seedling cultivation technology, specifically a method for cultivating kelp seedlings. The method is characterized by the following steps: (I) obtaining a formula relating the breaking force of kelp to the width, thickness, and average value of the thallus; (1) water flow screening; (2) sea cultivation; (3) breaking force testing and screening to obtain the formula; (II) seedling cultivation; (4) water flow screening; (5) sea cultivation; (6) seedling screening; (7) sea cultivation and weighted growth; (8) breaking force testing and screening; (9) seedling cultivation. This method has the advantages of being simple, having good cultivation effect, and low seedling breakage rate.

Description

Technical Field

[0001] This invention relates to the field of kelp seedling cultivation technology, specifically a simple method for cultivating kelp seedlings with good cultivation results and low seedling breakage rate. Background Technology

[0002] As is well known, kelp is an important marine aquaculture algae in my country, with an annual production of up to 1.5 million tons. As a high-value marine food, kelp is rich in various minerals and nutrients, and has wide applications in food processing, industry, and medicine. Kelp farming has brought considerable economic benefits, created numerous job opportunities in coastal areas, and further promoted international trade and economic development through the export of processed kelp products. Moreover, kelp can absorb nutrients such as nitrogen and phosphorus from water bodies, helping to alleviate eutrophication. Its carbon sequestration capacity also effectively reduces greenhouse gas emissions, playing a vital role in protecting the marine ecological environment. In addition, kelp can absorb nutrient pollution caused by terrestrial fertilizers, prevent algal blooms, and protect marine biodiversity.

[0003] During kelp cultivation, kelp seedling loss occurs to varying degrees. Taking the Sangou Bay kelp cultivation area, a major kelp farming region in my country, as an example, when clamping seedlings, farmers typically clamp 30-35 seedlings per 2.3m rope. However, at harvest time, only 20-25 seedlings remain on the 2.3m rope. In some higher areas (water depths approaching 30m), less than 10 seedlings remain on a single rope. This situation is one of the most significant factors limiting deep-sea kelp cultivation. The main reasons for seedling loss are: ① Incomplete development of kelp rhizoids, resulting in insufficient adhesion to the seedling rope; ② Well-developed kelp rhizoids, but they do not adhere to the root system, commonly known as "not gripping the rope"; ③ Kelp rhizoids are too fragile and easily break under the influence of wind, waves, and currents. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple, effective, and low-breakage method for cultivating kelp seedlings.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A method for cultivating kelp seedlings, characterized by the following steps:

[0007] (I) Formula for the relationship between the breaking force of kelp and the width, thickness and average value of the thallus;

[0008] (1) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling rope. The initial flow rate of the water outlet is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet holes so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain.

[0009] (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0010] (3) Formula for screening by breaking force test: The kelp seedlings cultivated in step (2) are placed in the kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk are scanned and measured by the laser scanner. The data are recorded. Then, the kelp obtained in step (2) is cut off with the kelp rhizoids at 10cm. The broken kelp of each record number is then tested for breaking force by the breaking force device. The maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, thallus width, thallus thickness, and average value of the stalk are compared. The kelp seedlings with the maximum breaking force of 20% are screened out. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk is generated according to the linear regression fitting curve.

[0011] (II) Seedling raising:

[0012] (4) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling rope. The initial flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet hole so that the daily seedling loss rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain.

[0013] (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0014] (6) Seedling selection: 1000 kelp seedlings cultivated in step (5) were placed in a kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk were scanned and measured by a laser scanner. The data were recorded. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk obtained in step (3) was used. The thallus width, thallus thickness, and average value of stalk of each kelp were input respectively. Finally, 20% of the kelp seedlings with the largest breaking force were selected.

[0015] (7) Seedling cultivation and weighted growth in the sea: The kelp seedlings selected in step (6) are carried out in the sea. Before placing them in the sea, a weight is attached to the neck of the kelp seedling. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultivated in the sea for 4-6 months until it becomes an adult. After the kelp grows to 3-5m in length, it is removed.

[0016] (8) Breaking force test and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device. The kelp rhizomes are retained. A 1m sample is taken from the root for breaking force test. The maximum force of each kelp breaking is recorded. After the record is completed, the top 20% of the kelp are selected as seedlings according to the order of the maximum force of the kelp breaking.

[0017] (9) Seedling cultivation: Use the seedlings selected in step (8) and cultivate them. The seedlings can be planted in large quantities.

[0018] The seedling rack in step (1) or step (4) of the present invention includes a frame, a cultivation box on the frame, water outlet pipes connected side by side at the upper end of the cultivation box, seedling ropes after planting seedlings connected to the box below the water outlet pipes, an inclined seedling guide plate installed on the box below the seedling ropes, a seedling outlet on the side of the cultivation box, the lower end of the seedling guide plate extending to the seedling outlet position of the cultivation box, a sieve hole connected to the lower part of the seedling guide plate, a drain outlet at the bottom of the cultivation box, a drain pipe installed at the drain outlet, the drain pipe connected to the inlet of the water outlet pipe on the cultivation box via a water pump, the water pump being a variable frequency water pump, and the water flow rate of the water outlet pipe being adjusted by the water pump.

[0019] In step (7) of the present invention, the counterweight block has a structure including a hook and a counterweight block. The left and right sides of the counterweight block are respectively provided with insertion holes. The hook is set as an open ring. The two ends of the open ring are respectively inserted into the counterweight block to realize the detachable connection of the counterweight block. By replacing the counterweight block, the tensile strength of the neck of the kelp during the growth process can be increased.

[0020] The structure of the kelp parameter detection mechanism in step (3) of the present invention includes a support, a conveyor belt, a laser scanner, and a controller. The conveyor belt is installed on the support, and the roller at one end of the conveyor belt is connected to the drive motor. The laser scanner is installed on the support, with the scanning end of the laser scanner facing the direction of the conveyor belt. The laser scanner is connected to the controller. The laser scanner scans and photographs the kelp passing on the conveyor belt. The controller analyzes the signal transmitted by the laser scanner to obtain the thallus width, thallus thickness, and average stalk and stem parameters of each kelp.

[0021] The breaking force device in step (3) or step (8) of the present invention includes a breaking seat, a support rod, a clamp, a pull rope, a tension gauge, and a tension sensor. The left side of the breaking seat is connected to the support rod, the side of the support rod is connected to the clamp, the right side of the breaking seat is connected to the guide rail, a slider is installed on the guide rail, the slider is fixedly connected to the tension gauge, the slider is fixedly connected to the output end of the linear motor, the tension gauge is connected to the tension sensor, the kelp cultivated in step (2) is cut, the cut kelp leaf ends are clamped by the clamp, the cut kelp root faces the tension gauge, the hook of the tension gauge is connected to the pull rope, the pull rope is looped around the neck of the kelp, and then the linear motor is started. The linear motor drives the slider to move, which in turn drives the tension gauge to move. When the kelp is broken, the reading of the tension gauge is the breaking force reading. The tension sensor transmits the tension gauge reading at this moment to the controller, and the controller records the breaking force of the kelp.

[0022] The formula in step (3) of this invention is used for linear regression fitting within each breeding cycle. Each seedling cycle is 3 years. In the first year, step (i) is performed to obtain the formula for the relationship between kelp breaking force and thallus width, thallus thickness, and average value of the petiole. Based on the formula for the relationship between kelp breaking force and thallus width, thallus thickness, and average value of the petiole, the seedlings in step (ii) are performed every year for the next 1-3 years.

[0023] Because of the above-mentioned structure, this invention has the advantages of simple method, good cultivation effect and low seedling breakage rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the seedling rack structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the counterweight structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the kelp parameter detection mechanism of the present invention.

[0027] Figure 4 This is a schematic diagram of the breaking force device of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] As shown in the attached figure, a method for cultivating kelp seedlings is characterized by the following steps:

[0030] (I) Formula for the relationship between the breaking force of kelp and the width, thickness and average value of the thallus;

[0031] (1) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling rope. The initial flow rate of the water outlet is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet holes so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain.

[0032] (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0033] (3) Formula for screening by breaking force test: The kelp seedlings cultivated in step (2) are placed in the kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk are scanned and measured by the laser scanner. The data are recorded. Then, the kelp obtained in step (2) is cut off with the kelp rhizoids at 10cm. The broken kelp of each record number is then tested for breaking force by the breaking force device. The maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, thallus width, thallus thickness, and average value of the stalk are compared. The kelp seedlings with the maximum breaking force of 20% are screened out. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk is generated according to the linear regression fitting curve.

[0034] (II) Seedling raising:

[0035] (4) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling curtain rope. The initial flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet hole so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain.

[0036] (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0037] (6) Seedling selection: 1000 kelp seedlings cultivated in step (5) were placed in a kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk were scanned and measured by a laser scanner. The data were recorded. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk obtained in step (3) was used. The thallus width, thallus thickness, and average value of stalk of each kelp were input respectively. Finally, 20% of the kelp seedlings with the largest breaking force were selected.

[0038] (7) Seedling cultivation and weighted growth in the sea: The kelp seedlings selected in step (6) are carried out in the sea. Before placing them in the sea, a weight is attached to the neck of the kelp seedling. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultivated in the sea for 4-6 months until it becomes an adult. After the kelp grows to 3-5m in length, it is removed.

[0039] (8) Breaking force test and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device. The kelp rhizomes are retained. A 1m sample is taken from the root for breaking force test. The maximum force of each kelp breaking is recorded. After the record is completed, the top 20% of the kelp are selected as seedlings according to the order of the maximum force of the kelp breaking.

[0040] (9) Seedling cultivation: Use the seedlings selected in step (8) and cultivate them. The seedlings can be planted in large quantities.

[0041] Furthermore, the seedling rack in step (1) or step (4) includes a frame 1, a cultivation box 2 is provided on the frame 1, and water outlet pipes 3 are connected side by side to the upper end of the cultivation box 2. Seedling curtain ropes 4 after planting seedlings are connected to the box below the water outlet pipes 3. Inclined seedling guide plates 5 are installed on the box below the seedling curtain ropes 4. Seedling outlets 6 are provided on the side of the cultivation box 2. The lower end of the seedling guide plate 5 extends to the seedling outlet 6 of the cultivation box 2. The lower end of the seedling guide plate 5 is provided with sieve holes 7 that communicate with the lower part of the box of the cultivation box 2. A drain outlet is provided at the bottom of the box of the cultivation box 2. A drain pipe 8 is installed at the drain outlet. The drain pipe 8 is connected to the inlet of the water outlet pipe 3 on the cultivation box 2 via a water pump. The water pump 9 is a variable frequency water pump 9, and the water flow rate of the water outlet pipe 3 is adjusted by the water pump 9.

[0042] Furthermore, in step (7), the structure of the counterweight includes a hook 10 and a counterweight 11. The left and right sides of the counterweight 11 are respectively provided with insertion holes 12. The hook 10 is an open ring. The two ends of the open ring are respectively inserted into the counterweight 11 to realize the detachable connection of the counterweight 11. By replacing the counterweight 11, the tensile strength of the neck during the growth of kelp can be increased.

[0043] Furthermore, the structure of the kelp parameter detection mechanism in step (3) includes a support 13, a conveyor belt 14, a laser scanner 15, and a controller 16. The conveyor belt 14 is installed on the support 13, and the roller at one end of the conveyor belt 14 is connected to the drive motor. The laser scanner 15 is installed on the support 13, with the scanning end of the laser scanner 15 facing the direction of the conveyor belt 14. The laser scanner 15 is connected to the controller 16. The laser scanner 15 scans and photographs the kelp passing on the conveyor belt 14. The controller 16 analyzes the signal transmitted by the laser scanner 15 to obtain the thallus width, thallus thickness, and average stalk and stem parameters of each kelp.

[0044] Further, the breaking force device in step (3) or step (8) includes a breaking seat 17, a support rod 18, a clamp 19, a pull rope 20, a tension gauge 21, and a tension sensor 22. The left side of the breaking seat 17 is connected to the support rod 18, the side of the support rod 18 is connected to the clamp 19, the right side of the breaking seat 17 is connected to the guide rail 23, a slider 24 is installed on the guide rail 23, the slider 24 is fixedly connected to the tension gauge 21, the slider 24 is fixedly connected to the output end of the linear motor 25, the tension gauge 21 is connected to the tension sensor 22, and step (2) cultivation The kelp is cut, and the ends of the cut kelp leaves are clamped by clip 19. The root of the cut kelp faces the direction of the tension gauge 21. The hook of the tension gauge 21 is connected to the pull rope 20, which is looped around the neck of the kelp. Then, the linear motor 25 is started, which drives the slider 24 to move, and in turn drives the tension gauge 21 to move. At the moment when the kelp is broken, the reading of the tension gauge 21 is the breaking force reading. The tension sensor 22 transmits the reading of the tension gauge 21 at this moment to the controller 16, and the controller 16 records the breaking force of the kelp.

[0045] Furthermore, the formula in step (3) is used for linear regression fitting within each breeding cycle. Each seedling cycle is 3 years. In the first year, step (1) is performed to obtain the formula relating kelp breaking force to thallus width, thallus thickness, and average stipe. Based on the formula relating kelp breaking force to thallus width, thallus thickness, and average stipe, seedlings can be raised annually in step (2) for the next 1-3 years.

[0046] Example:

[0047] A method for cultivating kelp seedlings, characterized by the following steps:

[0048] (I) Formula for the relationship between the breaking force of kelp and the width, thickness and average value of the thallus;

[0049] (1) Water flow screening: 10,000 kelp seedlings are planted on the seedling curtain rope, the seedling curtain rope is on the seedling rack, the seedling rack is equipped with a water outlet pipe, the water outlet pipe is equipped with a water outlet hole, the water outlet hole faces the seedling curtain rope, the initial flow rate of the water outlet hole is 0.5-0.8m / s, the cultivation period is 2 months, within two months, the flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%, and finally on the 60th day, 10% or 1,000 seedlings remain.

[0050] (2) Cultivation in the sea: The 1,000 seedlings selected in step (1) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0051] (3) Formula for screening by breaking force test: 1000 kelp seedlings cultivated in step (2) were placed in a kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk of each kelp were scanned and measured by a laser scanner. The data were recorded. Then, the kelp obtained in step (2) was cut off with the kelp rhizoids intact for 10cm. The broken kelp of each recorded number was then tested for breaking force using a breaking force device. The maximum force of each kelp breaking was recorded. After the recording was completed, the breaking force, thallus width, thallus thickness, and average value of the stalk of the kelp were compared. 200 kelp seedlings were screened out. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk was generated based on the linear regression fitting curve.

[0052] (II) Seedling raising:

[0053] (4) Water flow screening: 10,000 kelp seedlings are planted on the seedling curtain rope, which is on the seedling rack. A water outlet pipe is installed on the seedling rack, and the water outlet pipe has a water outlet hole facing the seedling curtain rope. The initial flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, the flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% (1,000 seedlings) remain.

[0054] (5) Cultivation in the sea: The 1,000 seedlings selected in step (4) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed.

[0055] (6) Seedling selection: The 1,000 kelp seedlings cultivated in step (5) were placed in a kelp parameter testing institution for testing. The thallus width, thallus thickness, and average value of the stalk were scanned and measured by a laser scanner. The data were recorded. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of the stalk obtained in step (3) was used. The thallus width, thallus thickness, and average value of the stalk of each kelp were input respectively, and 200 kelp seedlings were finally selected.

[0056] (7) Seedling cultivation and weighted growth in the sea: 200 kelp seedlings selected in step (6) are screened and then placed in the sea. Before placing them in the sea, a weight is attached to the neck of the kelp seedling. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultivated in the sea for 4-6 months until it becomes an adult. After the kelp grows to 3-5m in length, it is removed.

[0057] (8) Breaking force test and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device. The kelp rhizomes are retained. A 1m sample is taken from the root for breaking force test. The maximum force of each kelp breaking is recorded. After the record is completed, the top 20% of the kelp are selected as seedlings according to the order of the maximum force of the kelp breaking.

[0058] (9) Seedling cultivation: Use the seedlings selected in step (8) and cultivate them. The seedlings can be planted in large quantities.

[0059] The weight of the aforementioned counterweight is 50% of the weight of a single kelp piece. For example, if the kelp is cultivated for four months, the weights for the first, second, third, and fourth months are 0.25kg, 0.5kg, 1.25kg, and 1.5kg, respectively. This is because, in the same batch of kelp, the heaviest piece is 40% heavier than the lightest piece. The weight gain data is calculated based on the growth curve of kelp cultivation in Sangou Bay.

[0060] Using SPSS 26 software, multiple linear regression was employed, with a stepwise calculation method. This method removes redundant, interfering, and repetitive data, obtaining the minimum reliable parameters representing the breaking force. Therefore, the formula in step (3) is: Kelp breaking force = -7.055 + 1.448 * thallus width (cm) + 9.041 * thallus thickness (mm) + 1.553 * mean stalk (mm).

[0061] Using the above-mentioned seedling cultivation method, since the kelp broken in step (8) can still be used for seedling cultivation, the kelp grown after seedling cultivation has advantages such as more resilient algae and more developed rhizoids, thereby reducing the seedling drop rate during cultivation, saving seedling usage, and is suitable for cultivation in areas with higher winds and waves; according to preliminary statistics, after screening the first generation using this method, the seedling drop rate of the offspring kelp is reduced by 5-10% compared to the previous generation. Due to the above-mentioned structure, this invention has the advantages of simple method, good cultivation effect, low seedling breakage rate, and low seedling drop rate.

Claims

1. A method for cultivating kelp seedlings, characterized in that... The steps of the cultivation method are as follows: (I) Formula for the relationship between the breaking force of kelp and the width, thickness and average value of the thallus; (1) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling curtain rope. The initial flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet hole so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain. (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed. (3) Formula for screening by breaking force test: The kelp seedlings cultivated in step (2) are placed in the kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk are scanned and measured by the laser scanner. The data are recorded. Then, the kelp obtained in step (2) is cut off with the kelp rhizoids at 10cm. The broken kelp of each record number is then tested for breaking force by the breaking force device. The maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, thallus width, thallus thickness, and average value of the stalk are compared. The kelp seedlings with the maximum breaking force of 20% are screened out. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk is generated according to the linear regression fitting curve. (II) Seedling raising: (4) Water flow screening: Take kelp seedlings and plant them on the seedling curtain rope. The seedling curtain rope is on the seedling rack. The seedling rack is equipped with a water outlet pipe with water outlet holes facing the seedling curtain rope. The initial flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. During the two months, adjust the flow rate of the water outlet hole so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, on the 60th day, 10% of the seedlings remain. (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling rack and placed in the sea to grow. They are cultivated in the sea for 0.8-1.2 months. After the kelp grows to 20cm in length, the kelp is removed. (6) Seedling selection: 1000 kelp seedlings cultivated in step (5) were placed in a kelp parameter testing institution for testing. The width of the thallus, the thickness of the thallus, and the average value of the stalk were scanned and measured by a laser scanner. The data were recorded. The formula for the relationship between breaking force and thallus width, thallus thickness, and average value of stalk obtained in step (3) was used. The thallus width, thallus thickness, and average value of stalk of each kelp were input respectively. Finally, 20% of the kelp seedlings with the largest breaking force were selected. (7) Seedling cultivation and weighted growth in the sea: The kelp seedlings selected in step (6) are carried out in the sea. Before placing them in the sea, a weight is attached to the neck of the kelp seedling. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultivated in the sea for 4-6 months until it becomes an adult. After the kelp grows to 3-5m in length, it is removed. (8) Breaking force test and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device. The kelp rhizomes are retained. A 1m sample is taken from the root for breaking force test. The maximum force of each kelp breaking is recorded. After the record is completed, the top 20% of the kelp are selected as seedlings according to the order of the maximum force of the kelp breaking. (9) Seedling cultivation: Use the seedlings selected in step (8) and cultivate them. The seedlings can be planted in large quantities.

2. The method for cultivating kelp seedlings according to claim 1, characterized in that... The seedling rack in step (1) or step (4) includes a frame, on which a cultivation box is provided. The upper end of the cultivation box is connected to a water outlet pipe in parallel. The seedling curtain rope after planting the seedlings is connected to the box below the water outlet pipe. The box below the seedling curtain rope is equipped with an inclined seedling guide plate. The side of the cultivation box is provided with a seedling outlet. The lower end of the seedling guide plate extends to the seedling outlet position of the cultivation box. The lower end of the seedling guide plate is provided with a sieve hole that communicates with the lower part of the cultivation box. The bottom of the cultivation box is provided with a drain outlet. A drain pipe is installed at the drain outlet. The drain pipe is connected to the inlet of the water outlet pipe on the cultivation box via a water pump. The water pump is a variable frequency water pump. The water flow rate of the water outlet pipe is adjusted by the water pump.

3. The method for cultivating kelp seedlings according to claim 1, characterized in that... The structure of the counterweight in step (7) includes a hook and a counterweight. The counterweight has insertion holes on the left and right sides respectively. The hook is an open ring. The two ends of the open ring are inserted into the counterweight to realize the detachable connection of the counterweight. By replacing the counterweight, the tensile strength of the neck during the growth of kelp can be increased.

4. The method for cultivating kelp seedlings according to claim 1, characterized in that... The structure of the kelp parameter detection mechanism in step (3) includes a support, a conveyor belt, a laser scanner, and a controller. The conveyor belt is installed on the support, and the roller at one end of the conveyor belt is connected to the drive motor. The laser scanner is installed on the support, with the scanning end of the laser scanner facing the direction of the conveyor belt. The laser scanner is connected to the controller. The laser scanner scans and photographs the kelp passing on the conveyor belt. The controller analyzes the signal transmitted by the laser scanner to obtain the thallus width, thallus thickness, and average stalk and stem parameters of each kelp.

5. The method for cultivating kelp seedlings according to claim 1, characterized in that... The breaking force device in step (3) or step (8) includes a breaking seat, a support rod, a clamp, a pull rope, a force gauge, and a force sensor. The left side of the breaking seat is connected to the support rod, the side of the support rod is connected to the clamp, the right side of the breaking seat is connected to the guide rail, a slider is installed on the guide rail, the slider is fixedly connected to the force gauge, the slider is fixedly connected to the output end of the linear motor, the force gauge is connected to the force sensor, the kelp cultivated in step (2) is cut, the cut kelp leaf ends are clamped by the clamp, the cut kelp root faces the force gauge, the hook of the force gauge is connected to the pull rope, the pull rope is looped around the neck of the kelp, and then the linear motor is started. The linear motor drives the slider to move, which in turn drives the force gauge to move. When the kelp is broken, the reading of the force gauge is the breaking force reading. The force sensor transmits the force gauge reading at this moment to the controller, and the controller records the breaking force of the kelp.

6. The method for cultivating kelp seedlings according to claim 1, characterized in that... The formula in step (3) is used for linear regression fitting within each breeding cycle. Each seedling cycle is 3 years. In the first year, step (1) is performed to obtain the formula for the relationship between kelp breaking force and thallus width, thallus thickness, and average value of the stalk. Based on the formula for the relationship between kelp breaking force and thallus width, thallus thickness, and average value of the stalk, the seedlings in step (2) are performed every year for the next 1-3 years.

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