Kelp seedling cultivation method

Abstract

The invention relates to the technical field of kelp seedling cultivation, in particular to a kelp seedling cultivation method which is characterized by comprising the following steps: (1) obtaining a formula of a relation between kelp breaking force and frond width, frond thickness and stem mean value; (1) water flow seedling screening; (2) culturing in the sea; (3) detecting and screening the breaking force to obtain a formula; (2) seedling raising; (4) water flow seedling screening; (5) culturing in the sea; (6) screening seedlings; (7) culturing seedlings in the sea and growing by balancing weight; (8) detecting and screening the breaking force; (9) seedling raising. The method has the advantages of being simple, good in cultivation effect, low in seedling breaking rate and the like.

Description

Technical Field

[0001] The invention relates to the technical field of kelp seedling cultivation, in particular to a kelp seedling cultivation method with simple method, good cultivation effect and low seedling breakage rate. Background Art

[0002] As we all know, kelp is an important marine aquaculture algae in my country, with an annual output of up to 1.5 million tons. As a high-value marine food, kelp is rich in a variety of minerals and nutrients, and is widely used in food processing, industrial and medicinal applications. The kelp farming industry has brought considerable economic benefits, created a large number of employment opportunities in coastal areas, and further promoted international trade and economic development by exporting kelp processed products. Moreover, kelp can absorb nutrients such as nitrogen and phosphorus in the water, which helps to alleviate the problem of eutrophication of seawater. At the same time, its carbon fixation ability can also effectively reduce greenhouse gas emissions, and plays an important role in the protection of the marine ecological environment. In addition, kelp can also absorb nutrient pollution caused by terrestrial fertilizers, prevent the occurrence of algal blooms, and protect marine biodiversity.

[0003] During the kelp farming process, kelp will experience varying degrees of seedling drop. Taking the Sanggou Bay farming area, an important kelp farming area in my country, as an example, when clamping seedlings, the farming workers generally clamp 30-35 seedlings / 2.3m rope, but when harvesting kelp, there are only 20-25 seedlings left on the 2.3m rope, and in some high areas (water depth close to 30m), there are less than 10 kelp left on 1 rope. The above situation is also one of the most important factors limiting the deep-sea farming of kelp. The main reasons for seedling drop are: ① The kelp rhizoids are underdeveloped and not tightly attached to the seedling rope; ② The kelp rhizoids are well developed, but not attached to the roots, commonly known as "not grabbing the rope"; ③ The kelp rhizoids are too fragile and easily broken under the action of wind, waves and currents. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide a method for cultivating kelp seedlings which is simple, has good cultivation effect and low seedling breakage rate.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A method for cultivating kelp seedlings, characterized in that the cultivation method comprises the following steps: (I) The formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the kelp stem is obtained; (1) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. A water outlet hole is provided on the water outlet pipe. The water outlet hole faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (3) Breaking force detection and screening formula: the kelp seedlings cultivated in step (2) are placed in a kelp parameter detection device for detection, and the width, thickness and stalk average of each kelp are scanned and measured by a laser scanner, and the data are recorded. Then, 10 cm of the kelp obtained in step (2) is cut with the kelp rhizoids retained, and the broken kelp with each recorded number data is tested for breaking force using a breaking force device, and the maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, kelp width, kelp thickness and stalk average of the kelp are compared, and the 20% of the kelp seedlings with the maximum breaking force are screened out, and a formula for the relationship between the breaking force and the kelp width, kelp thickness and stalk average is generated according to the linear regression fitting curve; (ii) Seedling cultivation: (4) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. A water outlet hole is provided on the water outlet pipe. The water outlet hole faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (6) Screening seedlings: Place the 1000 kelp seedlings cultivated in step (5) in a kelp parameter detection device for detection, scan and measure the algae width, algae thickness, and stalk average of each kelp with a laser scanner, and record the data. The formula for the relationship between the breaking force and the algae width, algae thickness, and stalk average obtained in step (3) is used; the algae width, algae thickness, and stalk average of each kelp are respectively input, and finally 20% of the kelp seedlings with the maximum breaking force are screened out; (7) Raising kelp seedlings in the sea and growing them with weights: The kelp seedlings selected in step (6) are cultured in a clamped manner. Before being placed in the sea, a weight is placed around the neck of the kelp seedlings. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultured in the sea for 4-6 months until it reaches adulthood. When the kelp grows to a length of 3-5 m, the kelp is removed; (8) Breaking force detection and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device, the kelp pseudo-roots are retained, 1 m is taken from the root for breaking force detection, and the maximum breaking force of each kelp is recorded. After the recording is completed, the top 20% of the kelp is screened as seedlings according to the order of the maximum breaking force of the kelp; (9) Seedling cultivation: The seedlings screened in step (8) are used and cultivated. The seedlings after cultivation can be planted in large quantities.

[0006] The seedling raising rack in step (1) or step (4) of the present invention comprises a frame body, a cultivation box is arranged on the frame body, the upper ends of the cultivation boxes are connected to water outlet pipes in parallel, the box body below the water outlet pipes is connected to seedling ropes after planting seedlings, an inclined seedling guide plate is installed on the box body below the seedling rope, a seedling outlet is arranged on the side of the cultivation box, 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 connected to the lower part of the box body of the cultivation box, a drain outlet is arranged at the bottom of the box body of the cultivation box, a drain outlet is installed at the drain outlet, the drain pipe is connected to the inlet of the water outlet pipe on the cultivation box through a water pump, the water pump is set as a variable frequency water pump, and the water outlet flow rate of the water outlet pipe is adjusted by the water pump.

[0007] The structure of the counterweight block in step (7) of the present invention includes a hook ring and a counterweight block, and the left and right sides of the counterweight block are respectively provided with insertion holes, and the hook ring is configured as an open ring, and 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 its growth process can be increased.

[0008] The structure of the kelp parameter detection mechanism in step (3) described in the present invention includes a bracket, a conveyor belt, a laser scanner, and a controller. The bracket is equipped with a conveyor belt, and a roller at one end of the conveyor belt is connected to a drive motor. The bracket is equipped with a laser scanner, and the scanning end of the laser scanner faces 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 algae width, algae thickness, and stalk mean parameters of each kelp.

[0009] The breaking force device in step (3) or step (8) of the present invention comprises 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, and the right side of the breaking seat is connected to a 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 off, and the ends of the cut kelp leaves are clamped by the clamp. The root of the cut kelp faces the direction of the tension gauge. The hook of the tension gauge is connected to the pull rope, and the pull rope is put on the neck of the kelp. Then the linear motor is started, and the linear motor drives the slider to move, and then drives the tension gauge to move. At the moment 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.

[0010] The formula in step (3) of the present invention is a linear regression fitting performed within each breeding cycle. Each seedling raising cycle is 3 years. In the first year, step (i) is performed to obtain the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae. Then, based on the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae, step (ii) can be performed every year for the next 1-3 years.

[0011] The invention has the advantages of simple method, good cultivation effect, low seedling breakage rate, etc. due to the adoption of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a seedling raising frame of the present invention.

[0013] Figure 2 It is a schematic diagram of the structure of the counterweight block of the present invention.

[0014] Figure 3 It is a schematic diagram of the structure of the kelp parameter detection mechanism of the present invention.

[0015] Figure 4 It is a schematic diagram of the structure of the breaking force device of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings: As shown in the accompanying drawings, a method for cultivating kelp seedlings is characterized in that the steps of the cultivation method are as follows: (I) The formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the kelp stem is obtained; (1) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. A water outlet hole is provided on the water outlet pipe. The water outlet hole faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (3) Breaking force detection and screening formula: the kelp seedlings cultivated in step (2) are placed in a kelp parameter detection device for detection, and the width, thickness and stalk average of each kelp are scanned and measured by a laser scanner, and the data are recorded. Then, 10 cm of the kelp obtained in step (2) is cut with the kelp rhizoids retained, and the broken kelp with each recorded number data is tested for breaking force using a breaking force device, and the maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, kelp width, kelp thickness and stalk average of the kelp are compared, and the 20% of the kelp seedlings with the maximum breaking force are screened out, and a formula for the relationship between the breaking force and the kelp width, kelp thickness and stalk average is generated according to the linear regression fitting curve; (ii) Seedling cultivation: (4) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. The water outlet pipe is provided with a water outlet hole, which faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (6) Screening seedlings: Place the 1000 kelp seedlings cultivated in step (5) in a kelp parameter detection device for detection, scan and measure the algae width, algae thickness, and stalk average of each kelp with a laser scanner, and record the data. The formula for the relationship between the breaking force and the algae width, algae thickness, and stalk average obtained in step (3) is used; the algae width, algae thickness, and stalk average of each kelp are respectively input, and finally 20% of the kelp seedlings with the maximum breaking force are screened out; (7) Raising kelp seedlings in the sea and growing them with weights: The kelp seedlings selected in step (6) are cultured in a clamped manner. Before being placed in the sea, a weight is placed around the neck of the kelp seedlings. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultured in the sea for 4-6 months until it reaches adulthood. When the kelp grows to a length of 3-5 m, the kelp is removed; (8) Breaking force detection and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device, the kelp pseudo-roots are retained, 1 m is taken from the root for breaking force detection, and the maximum breaking force of each kelp is recorded. After the recording is completed, the top 20% of the kelp is screened as seedlings according to the order of the maximum breaking force of the kelp; (9) Seedling cultivation: The seedlings screened in step (8) are used and cultivated. The seedlings after cultivation can be planted in large quantities.

[0017] Furthermore, the seedling raising rack in step (1) or step (4) comprises a frame 1, on which a cultivation box 2 is provided, the upper ends of the cultivation boxes 2 are connected to water outlet pipes 3 in parallel, the box below the water outlet pipes 3 is connected to a seedling curtain rope 4 after the seedlings are planted, an inclined seedling guide plate 5 is installed on the box below the seedling curtain rope 4, a seedling outlet 6 is provided on the side of the cultivation box 2, the lower end of the seedling guide plate 5 extends to the position of the seedling outlet 6 of the cultivation box 2, the lower end of the seedling guide plate 5 is provided with a sieve hole 7 connected to the lower part of the box body of the cultivation box 2, a drain outlet is provided at the bottom of the box body of the cultivation box 2, a drain outlet is installed, the drain outlet is connected to the inlet of the water outlet pipe 3 on the cultivation box 2 through a water pump, and the water pump 9 is set to a variable frequency water pump 9, and the water outlet flow rate of the water outlet pipe 3 is adjusted by the water pump 9.

[0018] Furthermore, the structure of the counterweight block in the step (7) includes a hook ring 10 and a counterweight block 11, and the left and right sides of the counterweight block 11 are respectively provided with insertion holes 12, and the hook ring 10 is configured as an open ring, and the two ends of the open ring are respectively inserted into the counterweight block 11 to realize the detachable connection of the counterweight block 11. By replacing the counterweight block 11, the tensile strength of the neck of the kelp during the growth process can be increased.

[0019] Furthermore, the structure of the kelp parameter detection mechanism in step (3) includes a bracket 13, a conveyor belt 14, a laser scanner 15, and a controller 16. The conveyor belt 14 is installed on the bracket 13, and a roller at one end of the conveyor belt 14 is connected to a drive motor. The laser scanner 15 is installed on the bracket 13, and the scanning end of the laser scanner 15 is facing 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 algae width, algae thickness, and stalk mean parameters of each kelp.

[0020] Further, the breaking force device in step (3) or step (8) comprises a breaking seat 17, a support rod 18, a clamp 19, a pull rope 20, a tension meter 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 meter 21, the slider 24 is fixedly connected to the output end of the linear motor 25, the tension meter 21 is connected to the tension sensor 22, and step (2) is cultivated. The kelp is cut off, and the end of the cut kelp leaf is clamped by the clip 19. The root of the cut kelp is toward the direction of the dynamometer 21. The hook of the dynamometer 21 is connected with the pull rope 20. The pull rope 20 is put on the neck of the kelp, and then the linear motor 25 is started. The linear motor 25 drives the slider 24 to move, and then drives the dynamometer 21 to move. At the moment the kelp is broken, the reading of the dynamometer 21 is the breaking force reading. The tension sensor 22 transmits the dynamometer 21 reading at this moment to the controller 16, and the controller 16 records the breaking force of the kelp.

[0021] Furthermore, the formula in step (3) is a linear regression fit performed within each breeding cycle. Each seedling raising cycle is 3 years. In the first year, step (i) is performed to obtain the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae. Then, based on the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae, step (ii) can be performed every year for the next 1-3 years.

[0022] Example: A method for cultivating kelp seedlings, characterized in that the cultivation method comprises the following steps: (I) The formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the kelp stem is obtained; (1) Screening seedlings by water flow: 10,000 kelp seedlings are planted on a seedling curtain rope, which is on a seedling raising rack. A water outlet pipe is installed on the seedling raising rack. The water outlet pipe is provided with a water outlet hole, which faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10%, i.e., 1,000 seedlings, are left on the 60th day. (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 for growth. The kelp is cultivated in the sea for 0.8 to 1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (3) Breaking force detection and screening formula: 1000 kelp seedlings cultivated in step (2) are placed in a kelp parameter detection device for detection, and the width, thickness and stalk average of each kelp are scanned and measured by a laser scanner, and the data are recorded. Then, 10 cm of the kelp obtained in step (2) is cut off with the kelp rhizoids retained, and then the broken kelp with each recorded number data is tested for breaking force using a breaking force device, and the maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, kelp width, kelp thickness and stalk average of the kelp are compared, and 200 kelp seedlings are screened out, and a formula for the relationship between breaking force and kelp width, kelp thickness and stalk average is generated according to the linear regression fitting curve; (ii) Seedling cultivation: (4) Screening seedlings by water flow: 10,000 kelp seedlings are planted on a seedling curtain rope, which is on a seedling raising rack. A water outlet pipe is installed on the seedling raising rack. The water outlet pipe is provided with a water outlet hole, which faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10%, i.e., 1,000 seedlings, are left on the 60th day. (5) Cultivation in the sea: The 1000 seedlings selected in step (4) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (6) Screening seedlings: Place the 1000 kelp seedlings cultivated in step (5) in a kelp parameter detection device for detection, scan and measure the algae width, algae thickness, and stalk average of each kelp with a laser scanner, and record the data. The formula for the relationship between the breaking force and the algae width, algae thickness, and stalk average obtained in step (3) is used; the algae width, algae thickness, and stalk average of each kelp are input respectively, and finally 200 kelp seedlings are screened out; (7) Raising kelp seedlings in the sea and growing them with weights: The 200 kelp seedlings selected in step (6) are cultured in a clamped manner. Before being placed in the sea, a weight is placed around the neck of the kelp seedlings. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultured in the sea for 4-6 months until it reaches adulthood. When the kelp grows to a length of 3-5 m, the kelp is removed; (8) Breaking force detection and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device, the kelp pseudo-roots are retained, 1 m is taken from the root for breaking force detection, and the maximum breaking force of each kelp is recorded. After the recording is completed, the top 20% of the kelp is screened as seedlings according to the order of the maximum breaking force of the kelp; (9) Seedling cultivation: The seedlings screened in step (8) are used and cultivated. The seedlings after cultivation can be planted in large quantities.

[0023] The weight of the above-mentioned counterweight blocks is 50% of the weight of a single kelp. For example, if the kelp is cultivated for four months, the first month, second month, third month and fourth month are 0.25kg, 0.5kg, 1.25kg and 1.5kg respectively. This is because, for the same batch of culture, the heaviest is 40% higher than the lightest on average. The weight gain data is calculated based on the growth curve of kelp culture in Sanggou Bay.

[0024] SPSS 26 software was used to perform multiple linear regression, and the calculation method was stepwise. This method can remove redundant, interfering, and repeated data and obtain the minimum credible parameter representing the breaking force. Therefore, the formula in step (3) is: kelp breaking force = -7.055 + 1.448 * algae width (cm) + 9.041 * algae thickness (mm) + 1.553 * stalk mean (mm).

[0025] By adopting the above-mentioned seedling raising method, since the kelp broken in step (8) can also be used for seedling raising, the kelp grown after the seedling raising has the advantages of tougher algae and more developed rhizoids, thereby reducing the seedling drop rate during the breeding period, saving seedlings, and being suitable for breeding in areas with higher winds and waves. According to preliminary statistics, after one generation of screening using this method, the seedling drop rate of the offspring kelp is reduced by 5-10%. Due to the adoption of the above-mentioned structure, the present invention has the advantages of simple method, good breeding effect, low seedling breakage rate, low seedling drop rate, etc.

Claims

1. A method for cultivating kelp seedlings, characterized in that The steps of the cultivation method are as follows: (I) The formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the kelp stem is obtained; (1) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. A water outlet pipe is provided with a water outlet hole, which faces the seedling curtain rope. The initial water outlet flow rate of the water outlet hole is 0.5-0.8 m / s. The cultivation period is 2 months. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (2) Cultivation in the sea: The seedlings selected in step (1) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (3) Breaking force detection and screening formula: the kelp seedlings cultivated in step (2) are placed in a kelp parameter detection device for detection, and the width, thickness and stalk average of each kelp are scanned and measured by a laser scanner, and the data are recorded. Then, 10 cm of the kelp obtained in step (2) is cut with the kelp rhizoids retained, and the broken kelp with each recorded number data is tested for breaking force using a breaking force device, and the maximum force of each kelp breaking is recorded. After the recording is completed, the breaking force, kelp width, kelp thickness and stalk average of the kelp are compared, and the 20% of the kelp seedlings with the maximum breaking force are screened out, and a formula for the relationship between the breaking force and the kelp width, kelp thickness and stalk average is generated according to the linear regression fitting curve; (ii) Seedling cultivation: (4) Screening seedlings by water flow: Take kelp seedlings and plant them on seedling curtain ropes, which are placed on seedling raising racks. A water outlet pipe is installed on the seedling raising rack. The water outlet pipe is provided with a water outlet hole, which faces 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. Within two months, the water outlet flow rate of the water outlet hole is adjusted so that the daily seedling drop rate is between 1.5% and 2.5%. Finally, 10% of the seedlings remain on the 60th day. (5) Cultivation in the sea: The seedlings selected in step (4) are taken out from the seedling raising rack and placed in the sea for growth. The kelp is cultivated in the sea for 0.8-1.2 months. When the kelp grows to 20 cm in length, the kelp is removed; (6) Screening seedlings: Place the 1000 kelp seedlings cultivated in step (5) in a kelp parameter detection device for detection, scan and measure the algae width, algae thickness, and stalk average of each kelp with a laser scanner, and record the data. The formula for the relationship between the breaking force and the algae width, algae thickness, and stalk average obtained in step (3) is used; the algae width, algae thickness, and stalk average of each kelp are respectively input, and finally 20% of the kelp seedlings with the maximum breaking force are screened out; (7) Raising kelp seedlings in the sea and growing them with weights: The kelp seedlings selected in step (6) are cultured in a clamped manner. Before being placed in the sea, a weight is placed around the neck of the kelp seedlings. As the kelp grows, the weight of the weight is gradually increased. The kelp is cultured in the sea for 4-6 months until it reaches adulthood. When the kelp grows to a length of 3-5 m, the kelp is removed; (8) Breaking force detection and screening: The kelp cultivated in step (7) is tested for breaking force using a breaking force device, the kelp pseudo-roots are retained, 1 m is taken from the root for breaking force detection, and the maximum breaking force of each kelp is recorded. After the recording is completed, the top 20% of the kelp is screened as seedlings according to the order of the maximum breaking force of the kelp; (9) Seedling cultivation: The seedlings screened in step (8) are used and cultivated. The seedlings after cultivation can be planted in large quantities.

2. A method for cultivating kelp seedlings according to claim 1, characterized in that The seedling raising frame in step (1) or step (4) comprises a frame body, a cultivation box is arranged on the frame body, the upper ends of the cultivation boxes are connected to water outlet pipes in parallel, the box body below the water outlet pipes is connected to the seedling curtain rope after the seedlings are planted, the box body below the seedling curtain rope is installed 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 connected to the lower part of the box body of the cultivation box, the bottom of the box body of the cultivation box is provided with a drain outlet, the drain outlet is installed with a drain pipe, the drain pipe is connected to the inlet of the water outlet pipe on the cultivation box through a water pump, the water pump is set as a variable frequency water pump, and the water outlet flow rate of the water outlet pipe is adjusted by the water pump.

3. A method for cultivating kelp seedlings according to claim 1, characterized in that The structure of the counterweight block in step (7) comprises a hook ring and a counterweight block, wherein the left and right sides of the counterweight block are respectively provided with insertion holes, and the hook ring is configured as an open ring, wherein both ends of the open ring are respectively inserted into the counterweight block to realize a detachable connection of the counterweight block. By replacing the counterweight block, the tensile strength of the neck of the kelp during its growth process can be increased.

4. A 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 bracket, a conveyor belt, a laser scanner, and a controller. The bracket is equipped with a conveyor belt, and a roller at one end of the conveyor belt is connected to a drive motor. The bracket is equipped with a laser scanner, and the scanning end of the laser scanner faces 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 algae width, algae thickness, and stalk mean parameters of each kelp.

5. A method for cultivating kelp seedlings according to claim 1, characterized in that The breaking force device in step (3) or step (8) comprises 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, and the right side of the breaking seat is connected to a 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 off, and the ends of the cut kelp leaves are clamped by the clamp. The root of the cut kelp faces the direction of the tension gauge. The hook of the tension gauge is connected to the pull rope, and the pull rope is put on the neck of the kelp. Then the linear motor is started, and the linear motor drives the slider to move, and then drives the tension gauge to move. At the moment 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.

6. A method for cultivating kelp seedlings according to claim 1, characterized in that The formula in step (3) is a linear regression fit performed in each breeding cycle. Each seedling raising cycle is 3 years. In the first year, step (i) is performed to obtain the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae. Based on the formula for the relationship between the breaking force of kelp and the width, thickness and mean value of the algae, step (ii) can be performed every year for the next 1-3 years.

Images