Yield recording method suitable for Antarctic krill underwater continuous pumping fishing boat

Abstract

The invention discloses a yield recording method suitable for an antarctic krill underwater continuous pumping fishing boat, and belongs to the field of aquatic product fishing. A flow scale is installed in front of a krill fishing temporary storage tank; averagely dividing a day into 12 fishing periods by taking 00: 00 as a starting point; distinguishing left and right side netting gears, and recording fishing information of the netting gears respectively; recording the reading of the flow scale and the position of the fishing boat in each fishing period; sampling the euphausia superba catches flowing through the flow scale in each time period, and measuring the moisture content of the euphausia superba catches; and calculating the euphausia superba fishing net weight of each fishing time period of each net according to the reading of the flow scale and the water content. According to the method, discharging control over the krill in the temporary storage tank is not needed, only the reading of the flow scale needs to be recorded at the starting moment and the ending moment of the fishing period, operation is easy and cheap, and production efficiency is improved. And the freshness of the krill is preserved to the greatest extent, so that the processing quality of the krill is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of aquatic fishing, and particularly relates to a method for recording the yield of an underwater continuous pump suction fishing vessel suitable for Antarctic krill. Background Art

[0002] The underwater continuous pump suction fishing technology is the most advanced fishing technology in the Antarctic krill fishery at present. For underwater continuous pump suction fishing vessels for krill, a flow meter is installed after the krill catch temporary storage tank. After the krill are pumped up, they first enter the temporary storage tank for temporary storage. When processing is required, they are then discharged and weighed by the flow meter. According to the regulations for yield recording, it is required to determine the fishing volume and fishing location of krill within every two-hour period. In theory, this requires the krill catch in the temporary storage tank to be continuously discharged from the temporary storage tank without staying in the tank. However, this is impossible in actual production because only when the krill catch reaches a certain amount can shrimp meal processing be carried out. When the yield is poor, it may take a long time to reach the processing volume requirement; and when the catch yield is particularly good, the product processing cannot keep up, so shrimp are discharged according to the processing volume, and the remaining krill will be temporarily stored in the temporary storage tank. This results in the inability to confirm the fishing volume of krill within two hours. To solve this problem, the Norwegian fishing vessels use multiple temporary storage tanks for krill catch, alternating their use, measuring the volume of krill in the temporary storage tank once every two hours, recording the relative fishing volume of krill within every two hours based on the volume change, and using this as a ratio. At the end of the day, the weight data of the krill passing through the flow meter is then distributed to each period according to this ratio. During the operation process, any temporary storage tank cannot perform both the operations of shrimp intake and discharge simultaneously, that is, within the specified two hours, either only shrimp are discharged or only shrimp are taken in. Although this can meet the requirements of yield recording, there are obvious drawbacks. One is that the operation is complex, the calculation is cumbersome, and it is time-consuming and laborious; the other is that it affects the quality of krill. Krill have autolytic enzymes in their bodies and will quickly deteriorate after death, and this kind of operation requires the krill catch to be stored in the temporary storage tank for at least two hours, which cannot meet the processing standards of frozen raw shrimp products. Summary of the Invention

[0003] The purpose of the present invention is to solve the defects existing in the prior art, and to propose a method for recording the yield of an underwater continuous pump suction fishing vessel suitable for Antarctic krill.

[0004] To achieve the above purpose, the present invention adopts the following technical solution:

[0005] A method for recording the yield of an underwater continuous pump suction fishing vessel suitable for Antarctic krill, and the specific steps of this yield recording method are as follows:

[0006] Step 1: Install the flow meter before the krill catch temporary storage tank;

[0007] Step 2: Starting from 00:00, divide a day into 12 fishing periods on average;

[0008] Step 3: Distinguish the net gears on the left and right sides and record their fishing information separately;

[0009] Step 4: Record the readings of the flowmeter and the positions of the fishing vessels during each fishing period;

[0010] Step 5: Take samples of the krill catches flowing through the flowmeter during each period and measure their moisture content;

[0011] Step 6: Calculate the net weight of the krill catches of each net gear during each fishing period based on the flowmeter readings and the moisture content.

[0012] As a further solution of the present invention, the specific installation position of the flowmeter in Step 1 is as follows:

[0013] Step 1.1: Install the flowmeter at the position after the krill draining tank and before the krill temporary storage tank, ensuring that all the krill flowing out of the draining tank pass through the flowmeter for weighing and then enter the krill temporary storage tank or are diverted directly into the production line.

[0014] As a further solution of the present invention, the specific method for dividing the fishing periods in Step 2 is as follows:

[0015] Step 2.1: Starting from 00:00, divide a day into 12 periods on average, with each 2 hours as a fishing period, that is, divided into 12 fishing periods such as 00:00 - 02:00, 02:00 - 04:00......22:00 - 24:00;

[0016] Step 2.2: During the net - laying stage, if the fishing start time is not at an integer hour, record it according to the actual time. For example, if fishing starts at 00:35, the fishing time of this net - laying is recorded as 00:35 - 02:00;

[0017] Step 2.3: During the net - hauling stage, if the fishing end time is not at an integer hour, record it according to the actual time. For example, if fishing ends at 23:35, the fishing time of this net - hauling is recorded as 22:00 - 23:35.

[0018] As a further solution of the present invention, the specific method for distinguishing the net gears on the left and right sides in Step 3 is as follows:

[0019] Step 3.1: Set a number for each of the net gears on both sides;

[0020] Step 3.2: Record the fishing time of each of the net gears on both sides according to the method in Step 1 respectively. Record each fishing period of each net as a fishing net - haul and set a unique net serial number.

[0021] As a further solution of the present invention, the specific methods for reading the flow scale and recording the positions of fishing vessels in step 4 are as follows:

[0022] Step 4.1: Record the longitude and latitude positions of the fishing vessel at the start and end of each fishing period respectively.

[0023] Step 4.2: Record the cumulative readings of the left and right flow scales at the start and end of each fishing period respectively.

[0024] Step 4.3: Subtract the reading of the flow scale at the start of fishing from the reading at the end of fishing in each fishing period, and record the gross weight of the krill catch in this period.

[0025] As a further solution of the present invention, the specific steps for measuring the moisture content of the krill catch in step 5 are as follows:

[0026] Step 5.1: Take samples of the krill catch flowing through the flow scale in each fishing period respectively, and take 10 samples of a certain weight each time.

[0027] Step 5.2: Weigh the 10 samples respectively and record the gross weight (including moisture) of each sample; Step 5.3: Use a sieve and a basket to drain the water from the samples for more than half an hour until the water in the samples is completely drained.

[0028] Step 5.4: After the water drainage is completed, weigh the samples again respectively and record the net weight (excluding moisture) of each sample.

[0029] Step 5.5: Calculate the moisture content of each sample by using the weights before and after water drainage, and take the average value of the moisture contents of the 10 samples as the moisture content of the krill catch in this fishing period.

[0030] As a further solution of the present invention, the specific steps for calculating the net weight of the krill catch in step 6 are as follows:

[0031] Step 6.1: Calculate the net weight of the krill catch in this fishing trip by using the gross weight of the krill catch of each net on each side recorded in step 4 and the moisture content of the krill catch of this net in this fishing period recorded in step 5.

[0032] Step 6.2: If the left and right nets share a flow scale, allocate the net weight of the krill catch of the two nets according to the actual fishing duration of the two nets in the same fishing period.

[0033] As a further solution of the present invention, the specific calculation formula for the net weight of the krill catch in step 6.1 is as follows:

[0034] m = M * (1 - F), where m represents the net weight of krill caught during the fishing period; M represents the weight of krill flowing through the flowmeter during the fishing period (gross weight of catch); F represents the moisture content of the krill catch flowing through the flowmeter during the fishing period.

[0035] As a further solution of the present invention, the specific calculation formula for the yield distribution when two sets of net gears share one flowmeter in step 6.2 is as follows:

[0036] m1 = m * h1 / (h1 + h2), m2 = m * h2 / (h1 + h2), where m represents the net weight of krill caught during the fishing period; h1 and h2 respectively represent the actual fishing durations of net gear 1 and 2 during the fishing period; m1 and m2 respectively represent the net weights of krill caught by net gear 1 and 2 during the fishing period.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. Simplify operations, improve efficiency, and ensure the processing quality of krill. The new yield recording method applicable to Antarctic krill underwater continuous pump suction fishing vessels installs the flowmeter before the krill temporary storage tank. After the krill is pumped onto the ship, it directly flows through the flowmeter for weighing after draining, and then enters the temporary storage tank. Compared with the prior art, there is no need to control the discharge of krill in the temporary storage tank, and only the readings of the flowmeter need to be recorded at the beginning and end of the fishing period. The operation is simple and inexpensive, improving production efficiency. Since there is no need to control the discharge of the krill catch, the krill is weighed immediately after draining through the flowmeter and then can enter the production line for processing. Compared with the prior art where krill has to be stored in the temporary storage tank for at least 2 hours, the freshness of krill is maximally preserved, thereby ensuring the processing quality of krill. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the installation structure of the flowmeter in the prior art of the present invention;

[0040] Figure 2 It is a schematic diagram of the installation structure of the flowmeter of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0041] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0042] Embodiment 1

[0043] Refer to Figure 2 , a new yield recording method applicable to Antarctic krill underwater continuous pump suction fishing vessels, and the specific steps of this yield recording method are as follows:

[0044] Install the flowmeter before the krill catch temporary storage tank.

[0045] Specifically, install the flow scale at a position after the krill draining tank and before the krill temporary storage tank to ensure that all the krill flowing out of the draining tank pass through the flow scale for weighing and then enter the krill temporary storage tank or are diverted directly into the production line.

[0046] Distinguish the net gears on the starboard and port sides and record their fishing information separately. For example, the net gear on the starboard side is 1 and the net gear on the port side is 2.

[0047] Specifically, taking 00:00 as the starting point, divide a day into 12 time periods on average, with each 2-hour period as a fishing time period, that is, divided into 12 fishing time periods such as 00:00 - 02:00, 02:00 - 04:00......22:00 - 24:00; during the net casting stage, if the fishing start time is not at an integer hour, record it according to the actual time. For example, if fishing starts at 00:35, the fishing time of this net is recorded as 00:35 - 02:00; during the net hauling stage, if the fishing end time is not at an integer hour, record it according to the actual time. For example, if fishing ends at 23:35, the fishing time of this net is recorded as 22:00 - 23:35.

[0048] Record the readings of the flow scale and the position of the fishing boat for each fishing time period.

[0049] Specifically, record the longitude and latitude positions of the fishing boat at the start and end times of each fishing time period; record the cumulative readings of the flow scales on the starboard and port sides at the start and end times of each fishing time period; subtract the reading of the flow scale at the start of the fishing time period from the reading at the end of the fishing time period of each fishing time period and record it as the gross weight of the krill catch in this time period.

[0050] Take samples of the krill catch flowing through the flow scale for each time period and measure their moisture content.

[0051] Specifically, take samples of the krill catch flowing through the flow scale separately within each fishing time period, taking 10 samples of a certain weight each time; weigh the 10 samples separately and record the gross weight (including moisture) of each sample; use a sieve and a basket to drain the samples for more than half an hour until the moisture in the samples is drained completely; after draining, weigh the samples separately again and record the net weight (excluding moisture) of each sample; calculate the moisture content of each sample based on the weights before and after draining, and take the average of the moisture contents of the 10 samples as the moisture content of the krill catch in this fishing time period.

[0052] Calculate the net weight of the krill catch for each net gear in each fishing time period based on the readings of the flow scale and the moisture content.

[0053] Specifically, calculate the net weight of the krill catch in this net by using the gross weight of the krill catch of each net gear in each fishing time period and the moisture content of the krill catch of this net gear in this fishing time period.

[0054] In this embodiment, the specific calculation formula for the net weight of krill caught is as follows:

[0055] m = M*(1 - F), where m represents the net weight of krill caught during this fishing period; M represents the weight of krill flowing through the flowmeter during this fishing period (gross weight of catch); F represents the moisture content of the krill catch flowing through the flowmeter during this fishing period.

[0056] Specifically, if the netting gears on both the port and starboard sides share one flowmeter, the net weight of krill caught by the two netting gears is allocated according to the actual fishing duration of the two netting gears during the same fishing period.

[0057] In this embodiment, the specific calculation formula for the yield allocation when the two netting gears share one flowmeter is as follows:

[0058] m1 = m*h1 / (h1 + h2), m2 = m*h2 / (h1 + h2), where m represents the net weight of krill caught during this fishing period; h1 and h2 respectively represent the actual fishing durations of netting gear 1 and netting gear 2 during this fishing period; m1 and m2 respectively represent the net weights of krill caught by netting gear 1 and netting gear 2 during this fishing period.

[0059] Embodiment 2

[0060] Take the netting gear on the starboard side as 1 and the netting gear on the port side as 2. For example: Netting gear 1 starts fishing at 00:45 and ends at 16:10; Netting gear 2 starts fishing at 03:35 and ends at 23:20. Specifically, the fishing time records of the two netting gears are shown in Table 1;

[0061] Table 1 shows the start and end times of fishing for the port and starboard netting gears

[0062] Net gear number Net haul serial number Start fishing time End fishing time 1 1 0:45 2:00 1 2 2:00 4:00 2 3 3:35 4:00 1 4 4:00 6:00 2 5 4:00 6:00 1 6 6:00 8:00 2 7 6:00 8:00 1 8 8:00 10:00 2 9 8:00 10:00 1 10 10:00 12:00 2 11 10:00 12:00 1 12 12:00 14:00 2 13 12:00 14:00 1 14 14:00 16:00 2 15 14:00 16:00 1 16 16:00 16:10 2 17 16:00 18:00 2 18 18:00 20:00 2 19 20:00 22:00 2 20 22:00 23:20 .

[0063] Record the readings of the flowmeter and the position of the fishing vessel during each fishing period.

[0064] Specifically, record the longitude and latitude positions of the fishing vessel at the start and end moments of each fishing period; record the cumulative readings of the port and starboard flowmeters at the start and end moments of each fishing period; subtract the reading of the flowmeter at the start of the fishing period from the reading at the end of the fishing period for each fishing period, and record the result as the gross weight of the krill catch during this period. Examples of the records of the fishing vessel position, flowmeter readings, and gross weight of catch for each fishing period are shown in Table 2;

[0065] Table 2 shows the start and end times, positions, and gross weight of catch for the port and starboard netting gears

[0066]

[0067]

[0068] For each period, the krill catch flowing through the flowmeter is sampled and its moisture content is measured.

[0069] Specifically, within each fishing period, the krill catch flowing through the flowmeter is sampled separately. Each time, 10 samples of a certain weight are taken; the 10 samples are weighed separately, and the gross weight (including moisture) of each sample is recorded; the samples are drained using a sieve and a basket for more than half an hour until the moisture in the samples is completely drained; after the draining is completed, the samples are weighed again separately, and the net weight (excluding moisture) of each sample is recorded; the moisture content of each sample is calculated based on the weights before and after draining, and the average value of the moisture contents of the 10 samples is recorded as the moisture content of the krill catch in this fishing period. Taking the measurement of the moisture content of the catch in Haul 1 as an example, the measurement result is shown in Table 3;

[0070] Table 3 Weights of the extracted samples before and after draining

[0071]

[0072] Based on the flowmeter readings and moisture content, calculate the net weight of the krill catch for each net in each fishing period.

[0073] Specifically, use the gross weight of the krill catch of each net on each side during each fishing period and the moisture content of the krill catch of this net during this fishing period to calculate the net weight of the krill catch for this haul.

[0074] In this embodiment, the specific calculation formula for the net weight of the krill catch is as follows:

[0075] m = M * (1 - F), where m represents the net weight of the krill catch in this fishing period; M represents the weight of the krill flowing through the flowmeter during this fishing period (gross fishing weight); F represents the moisture content of the krill catch flowing through the flowmeter during this fishing period. Taking the calculation of the net fishing weight of Haul 1 as an example, its gross fishing weight M is 18635 kg, and the moisture content of the catch F is 0.15, then the net fishing weight m = 18635 kg * (1 - 0.15) = 15840 kg. The complete fishing data record for this day is shown in Table 4;

[0076] Table 4 Complete fishing data for this day

[0077]

[0078]

[0079] Specifically, if the nets on the left and right sides share one flowmeter, then allocate the net weight of the krill catch for the two nets according to the actual fishing duration of the two nets during the same fishing period.

[0080] In this embodiment, the specific calculation formula for the yield distribution when two sets of fishing gear share one flow scale is as follows:

[0081] m1 = m * h1 / (h1 + h2), m2 = m * h2 / (h1 + h2), where m represents the net weight of krill caught during this fishing period; h1 and h2 respectively represent the actual fishing durations of fishing gear 1 and 2 during this fishing period; m1 and m2 respectively represent the net weights of krill caught by fishing gear 1 and 2 during this fishing period. Taking the fishing times of fishing trips 2 and 3 as an example, assuming the flow scale reading at 2:00 is 18635 kg and the reading at 4:00 is 49820 kg, and assuming the moisture content of the catch during this fishing period is 0.15, then:

[0082] m = (49820 - 18635) kg * (1 - 0.15) = 26507 kg;

[0083] h1 = (4:00 - 2:00) = 2 hours;

[0084] h2 = (4:00 - 3:45) = 0.25 hours;

[0085] m1 = 26507 kg * 2 / (2 + 0.25) = 23562 kg;

[0086] m2 = 26507 kg * 0.25 / (2 + 0.25) = 2945 kg.

[0087] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and should not be used to limit the protection scope of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. A method for recording the production of Antarctic krill underwater continuous pumping fishing vessels, characterized in that: The specific steps of the production recording method are as follows: Step 1: Install the flow meter before the krill catch temporary storage tank; Step 2: Taking 00:00 as the starting point, divide the day into 12 fishing periods; Step 3: Distinguish the left and right fishing gears and record their fishing information respectively; Step 4: Record the flow scale reading and the location of the fishing boat during each fishing period; Step 5, sampling the krill catch flowing through the flow meter in each period and measuring its moisture content; Step 6: Calculate the net weight of krill caught in each fishing period for each net according to the flow scale reading and moisture content.

2. A method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific location of the flow scale in step 1 is as follows: install the flow scale after the krill drain tank and before the krill temporary storage tank to ensure that all krill are weighed by the flow scale after flowing out of the drain tank, and then enter the krill temporary storage tank or be diverted to directly enter the production line.

3. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific method for dividing the fishing period in step 2 is as follows: Step 2.1: Taking 00:00 as the starting point, divide the day into 12 periods on average, with each 2 hours being a fishing period, that is, 00:00-02:00, 02:00-04:00...22:00-24:00, a total of 12 fishing periods; Step 2.2: During the net-setting phase, if the start time of fishing is not at the hour, the actual time shall be recorded; Step 2.3: During the net-pulling stage, if the end time of fishing is not at the hour, the actual time shall be recorded.

4. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific method for distinguishing the left and right nets described in step 3 is as follows: Step 3.1: Set a number for each of the two sides of the net; Step 3.2: Record the fishing time of the two sides of the nets according to the method in step 1, record each fishing period of each net as a fishing time, and set a unique net serial number.

5. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific method of recording the flow scale reading and fishing vessel position in step 4 is as follows: Step 4.1: Record the latitude and longitude of the fishing vessel at the beginning and end of each fishing period; Step 4.2: Record the cumulative readings of the port and starboard flow scales at the beginning and end of each fishing period; Step 4.3: Subtract the flow scale reading at the beginning of each fishing period from the flow scale reading at the end of the fishing period to record the gross weight of krill caught during that period.

6. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific steps of measuring the moisture content of krill catch described in step 5 are as follows: Step 5.1: Sample the krill catch passing through the flow scale during each fishing period, taking 10 samples of a certain weight each time; Step 5.2: Weigh 10 samples separately and record the gross weight (including water content) of each sample; Step 5.3: Use a sieve and a frame to drain the sample for more than half an hour until all the water in the sample is drained; Step 5.4: After draining, weigh the samples again and record the net weight of each sample; Step 5.5: Use the weight before and after draining to calculate the moisture content of each sample, and take the average value of the moisture content of 10 samples as the moisture content of the krill catch during the fishing period.

7. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 1, characterized in that: The specific steps for calculating the net weight of krill caught in step 6 are as follows: Step 6.1: Calculate the net weight of krill caught in this fishing trip by using the gross weight of krill caught by each side of the net recorded in step 4 and the moisture content of krill caught by the net in the fishing period recorded in step 5; Step 6.2: If the left and right side nets share a flow scale, the net weight of krill caught by the two nets will be allocated according to the actual fishing time of the two nets during the same fishing period.

8. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 7, characterized in that: The specific calculation formula for the net weight of krill caught in step 6.1 is as follows: m=M*(1-F), where m represents the net weight of krill caught during the fishing period; M represents the weight of krill flowing through the flow scale during the fishing period, that is, the gross weight of the catch; and F represents the moisture content of the krill caught passing through the flow scale during the fishing period.

9. The method for recording the production of Antarctic krill underwater continuous pumping fishing vessels according to claim 7, characterized in that: The specific calculation formula for production distribution when two nets share one flow scale as described in step 6.2 is as follows: m1=m*h1 / (h1+h2), m2=m*h2 / (h1+h2), where m represents the net weight of krill caught during the fishing period; h1 and h2 represent the actual fishing time of nets 1 and 2 during the fishing period respectively; m1 and m2 represent the net weight of krill caught by nets 1 and 2 respectively during the fishing period.

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