CN113273533A - Method for measuring visual measurement of medium-large-sized jellyfish umbrella diameter - Google Patents
Method for measuring visual measurement of medium-large-sized jellyfish umbrella diameter Download PDFInfo
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- CN113273533A CN113273533A CN202110517800.0A CN202110517800A CN113273533A CN 113273533 A CN113273533 A CN 113273533A CN 202110517800 A CN202110517800 A CN 202110517800A CN 113273533 A CN113273533 A CN 113273533A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000007 visual effect Effects 0.000 title claims abstract description 27
- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 238000011179 visual inspection Methods 0.000 claims abstract description 35
- 238000011160 research Methods 0.000 claims abstract description 11
- 238000011835 investigation Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 6
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- 230000000694 effects Effects 0.000 description 2
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- 206010027336 Menstruation delayed Diseases 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008447 perception Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/90—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K73/00—Drawn nets
- A01K73/02—Trawling nets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
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Abstract
The invention relates to a method for measuring the diameter of a middle-large jellyfish umbrella by visual measurement, which comprises the following steps: (1) extending the cross rod out of the ship board, wherein a jellyfish collecting net is fixed at the top of the cross rod; (2) putting a mother drainage collection net into the sea, after visual inspection is started, enabling an investigation ship to run at a constant speed, enabling scientific research personnel to stand at an observation point for visual inspection, and fixing the visual inspection time of each station for 5 min; (3) if the visual inspection time is not finished, the net bags are filled with jellyfishes, two jellyfish collecting nets are alternately put away and put away until the visual inspection time reaches 5min or the collected jellyfishes meet the statistical requirement; (4) and (4) carrying out umbrella diameter measurement and counting on the large jellyfishes on the deck one by scientific research personnel by using the measuring tool. The method can be used for truly measuring the umbrella diameter of the jellyfishes visually observed, so that the quantitative judgment of the quantity and the size of each visual observation station jellyfish is realized, the integrity, the scientificity and the usability of the jellyfish data information obtained by the visual observation method are ensured, and the dynamic analysis and the research work of the subsequent jellyfish population are facilitated.
Description
Technical Field
The invention relates to the technical field of marine organism resource monitoring, in particular to a method for measuring the umbrella diameter of a large-medium jellyfish by visual inspection.
Background
In recent years, jellyfishes (jellyfish cyanagakiiki kishinouye, etc.) at the lower end of a food chain explode with the reasons of deterioration of marine environment, over-fishing, etc., and seriously affect the marine ecosystem, the food net structure, fishery production, etc. Therefore, the development of large jellyfish monitoring work has important significance for jellyfish vigorous development early warning and vigorous development mechanism research.
The conventional large jellyfish monitoring method mainly comprises netting gear investigation, acoustic investigation, visual inspection and the like. Various monitoring methods need to acquire jellyfish data information as much as possible, including the number of jellyfishes and the size of the jellyfishes (the size of the umbrella diameter). In the visual inspection, the visual inspection time is set during the predetermined course sailing by the inspection ship, and the number of jellyfishes is counted by visual inspection within a predetermined time, but the visual effect of the size of the jellyfishes, that is, the diameter of the umbrella is not ideal, because: 1) the visual estimation has errors compared with the actual measurement; 2) the sea water is refracted, and the measurement of the perception of the object in the water is changed after the object is refracted; 3) is a jellyfish body type solid, and the shape which is measured by eyes is not suitable for estimating the diameter of the umbrella. Therefore, it is difficult to quantitatively determine the size of the obtained large jellyfishes during the visual observation, and only a qualitative determination is made as to whether the diameter of the umbrella is large or small. The jellyfish data acquired in such a way is not complete through visual inspection, and the data of the size of the jellyfish is lacked, so that the subsequent research and the data comparison are influenced.
For the reasons, the invention is urgently needed to invent a method for measuring the diameter of the umbrella of the visually-measured jellyfish in the visual measurement process of the large-scale jellyfish so as to ensure the integrity, the scientificity and the usability of the jellyfish data information acquired by the visual measurement method.
Disclosure of Invention
Aiming at the problem that the measurement of the size (diameter) of the jellyfish is difficult to quantify in the monitoring method of large jellyfish visual measurement, the invention provides the fishing device and the method for measuring the umbrella diameter of the large jellyfish visual measurement, which can capture the large jellyfish visually and measure the umbrella diameter of the large jellyfish so as to realize the quantitative judgment of the size of the jellyfish visual measurement.
The technical means adopted by the invention are as follows:
a method for measuring the diameter of a middle-large jellyfish umbrella through visual measurement is characterized in that a fishing device is arranged on an investigation ship and comprises a support, a cross rod and a jellyfish collecting net, the supports are fixed on the ship boards on two sides of the investigation ship, one end of the cross rod is connected with the support, the other end of the cross rod is connected with the jellyfish collecting net, a net opening of the jellyfish collecting net is a circular steel ring, a net is connected behind the net opening, a net bag is connected behind the net opening, and the meshes of the net bag are consistent with those of the net; 2 jellyfish collecting nets are arranged on two sides of the survey ship;
the method comprises the following steps:
(1) the survey ship sails to an appointed visual inspection station, the cross rod extends out of the ship board through the operation of the support, the head of the cross rod is fixed on the support, the middle part of the cross rod and the top of the extending end are fixedly connected with the ship board through a rope, the stress of the cross rod caused by the existence of a jellyfish in a net during the ship sailing process is reduced, and the stability of the cross rod during the use process is ensured;
(2) before formal work, workers put the jellyfish collecting net fixed at the top of the cross rod into the sea according to a preset ship speed, the length of a rope between the cross rod and the net port is adjusted to ensure that 90% of the area of the net port is below the sea level, then the length of the rope in the state is fixed, so that the net, the rope and the cross rod are fixed, and the sinking and floating state and the collecting effect of the net port in the sea can be ensured only by putting the net port into the sea during normal work; after the start of visual inspection, scientific researchers stand at an observation point for visual inspection, an investigation ship runs at a constant speed according to a preset air route, the fixed visual inspection time of each visual inspection station is 5min, and jellyfishes observed visually enter a net bag of a jellyfish collecting net;
(3) if the net bag is not finished by visual inspection within 5min, the jellyfish collecting net is quickly pulled up from the sea, the collected jellyfishes are released and concentrated on the deck, meanwhile, the other jellyfish collecting net on the side of the ship board is placed into the sea, if the net bag is filled up again with the jellyfishes, the jellyfish collecting net is pulled up, the first jellyfish collecting net which has released the jellyfishes is placed into the sea again, and the process is repeated continuously until the visual inspection is finished or the number of the collected jellyfishes meets the requirement of statistics on the sample amount;
(4) the scientific research personnel measure and count the diameters of the jellyfish umbrellas one by using the measuring tool for the large jellyfish concentrated on the deck.
Furthermore, the length of the cross rod is 2-2.5 meters, the diameter of a net opening of the jellyfish collecting net is 2-2.5 meters, the length of the netting is 2.5-3 meters, and the length of the net bag is 2-2.5 meters. The arrangement of the size of the cross bar and the size of the net opening aims to capture the jellyfishes in the visual range as much as possible, and the observation radius, the size of the cross bar and the size of the net opening can be adjusted according to actual conditions in visual work.
Further, the mesh size is 1cm, 3cm or 10 cm.
Furthermore, the speed of the survey ship is 5-6 knots.
Furthermore, the visual observation range is a semicircle with the center position of the bow as the center of a circle and the radius of 5 m-8 m.
Compared with the prior art, the invention has the following advantages:
(1) in the large jellyfish visual measurement process, the umbrella diameter of the visually measured jellyfish can be measured, the quantitative judgment of the size of the jellyfish in the visual measurement is realized, and the integrity, the scientificity and the usability of the jellyfish data information obtained by the visual measurement method are ensured.
(2) The jellyfish quantity and the jellyfish size data of each visual measurement station can be accurately collected, and the dynamic analysis of the jellyfish population and the development of research work can be facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a fishing apparatus used in the present invention;
wherein, 1-support, 2-horizontal bar, 3-jellyfish collecting net, 301-net mouth, 302-netting and 303-net sac.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and specific examples, but the present invention is not limited to the following examples.
Example 1
As shown in fig. 1, a fishing device is arranged on the survey ship, the fishing device comprises a support 1, a cross rod 2 and a jellyfish collecting net 3, the supports 1 are fixed on the ship boards on two sides of the survey ship, one end of the cross rod 2 is connected with the support 1, the other end of the cross rod is connected with the jellyfish collecting net 3 through a connecting rope, a net opening 301 of the jellyfish collecting net is a circular steel ring, a net 302 is connected behind the net opening 301, and a net bag 303 is connected behind the net 302; 2 jellyfish collecting nets 3 are arranged on two sides of the investigation ship; the diameter of the net opening of the jellyfish collecting net is 2 meters, the length of the net is 2.5 meters, and the length of the net bag is 2 meters; adjusting the mesh size according to the growth stage of the large jellyfish, wherein the mesh size is 1cm from 5 months to 6 middle days (from the late period of the jellyfish saucer to the early period of the young jellyfish), the mesh size is 3cm from the late 6 th to the early 7 th (from the young jellyfish to the adult jellyfish), and the mesh size is 10cm from the middle 7 th to 10 months (from the adult jellyfish); A. the two positions B are positions for placing the support on the ship board, and AB is the length of the support; AC. BD is the length of the cross bar, 2 meters; EF. EG is visual radius, 5 m; e is an observation point;
when the survey ship runs at a constant speed of 5 knots according to a preset route, the visual inspection time of each visual inspection station position is fixed to be 5 min. After the survey ship reaches a designated visual station, the cross bar is extended out of the ship board through the operation of the support, the head of the cross bar is fixed on the support, and the middle part and the top of the cross bar are fixed on the ship board through connecting ropes. Before formal work, workers put the jellyfish collecting net fixed at the top of the cross rod into the sea according to a preset ship speed, the length of a rope between the cross rod and the net port is adjusted to ensure that 90% of the area of the net port is below the sea level, then the length of the rope in the state is fixed, so that the net, the rope and the cross rod are fixed, and the sinking and floating state and the collecting effect of the net port in the sea can be ensured only by putting the net port into the sea during normal work; after the visual inspection is started, a scientific research worker stands at a bow observation point for visual inspection, the visual inspection range is a semicircle with the center position of the bow as the center and the radius of the semicircle being 5m, meanwhile, other workers place the jellyfish collecting net fixed at the top of the cross rod into the sea, and most of jellyfishes observed visually enter net bags of the jellyfish collecting nets on the two sides of the ship. If the number of the collected jellyfishes is too large within the observation time, if the jellyfishes are fully filled in the net bags after 5min visual inspection is not finished, the jellyfish net is quickly pulled up from the sea, the collected jellyfishes are released and concentrated on the deck, meanwhile, another jellyfish collecting net is placed into the sea, if the net bags are fully filled again, the collecting net is pulled up, the first collecting net which has released the jellyfishes is placed into the sea again, the process is repeated continuously, the jellyfish collecting net is alternately used to obtain more large jellyfishes until the visual inspection time of the visual inspection station reaches 5min or the number of the collected jellyfishes reaches 50. According to the theory of statistics, 50 samples can better meet the requirement of statistics on the sample size.
Visual inspection is used as a large jellyfish monitoring means, the number statistics mainly depends on the visual inspection, and the jellyfish size statistics is realized through the method. During working, scientific research personnel measure and count the diameters of the jellyfish umbrellas one by using the measuring tool for the large jellyfish concentrated on the deck. And if the number of each large jellyfish at each visual station is not more than 50, all the large jellyfishes are measured and sampled, and otherwise, the umbrella diameter data of the 50 jellyfishes are measured. Therefore, the jellyfish quantity and the jellyfish size data of each visual station can be collected, and the dynamic analysis of the jellyfish population and the development of research work can be facilitated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for measuring the diameter of a medium-large jellyfish umbrella through visual measurement is characterized in that a fishing device is arranged on an investigation ship and comprises a support, a cross rod and a jellyfish collecting net, the supports are fixed on the ship boards on two sides of the investigation ship, one end of the cross rod is connected with the support, the other end of the cross rod is connected with the jellyfish collecting net, a net opening of the jellyfish collecting net is a circular steel ring, a net is connected behind the net opening, a net bag is connected behind the net opening, and the mesh of the net bag is consistent with that of the net; 2 jellyfish collecting nets are arranged on two sides of the survey ship;
the method comprises the following steps:
(1) the survey ship sails to an appointed visual inspection station, the cross rod extends out of the ship board through the operation of the support, the head of the cross rod is fixed on the support, and the middle part of the cross rod and the top of the extending end are connected with the ship board through a rope;
(2) before formal work, the jellyfish collecting net fixed at the top of the cross rod is placed into the sea according to a preset ship speed, the length of a rope between the cross rod and the net opening is adjusted to ensure that 90% of the area of the net opening is below the sea level, and then the length of the rope in the state is fixed; after the start of visual inspection, the survey ship drives at a constant speed according to a preset air route, and the visual inspection working time of each visual inspection station is fixed to be 5 min; scientific researchers stand at an observation point to carry out visual inspection, and jellyfishes observed by eyes enter the net bags of the jellyfish collecting net;
(3) if the net bag is not finished by visual inspection within 5min, the jellyfish collecting net is quickly pulled up from the sea, the collected jellyfishes are released and concentrated on the deck, meanwhile, the other jellyfish collecting net on the side of the ship board is placed into the sea, if the net bag is filled up again with the jellyfishes, the jellyfish collecting net is pulled up, the first jellyfish collecting net which has released the jellyfishes is placed into the sea again, and the process is repeated continuously until the visual inspection is finished or the number of the collected jellyfishes meets the requirement of statistics on the sample amount;
(4) the scientific research personnel measure and count the diameters of the jellyfish umbrellas one by using the measuring tool for the large jellyfish concentrated on the deck.
2. The method of claim 1, wherein the cross bar is 2-2.5 m long, the jellyfish collecting net has a net mouth diameter of 2-2.5 m, the net is 2.5-3 m long, and the net bag is 2-2.5 m long.
3. The method of claim 1, wherein the mesh size is 1cm, 3cm, or 10 cm.
4. The method of claim 1, wherein the survey vessel speed is 5-6 knots.
5. The method of claim 1, wherein the visual observation range is a semicircle with a radius of 5m to 8m and centered on the center of the bow.
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| CN202110517800.0A CN113273533B (en) | 2021-05-12 | 2021-05-12 | Method for measuring diameter of medium-and-large-sized jellyfish umbrella in visual inspection |
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| CN112613239A (en) * | 2020-11-24 | 2021-04-06 | 国家海洋局北海环境监测中心(中国海监北海区检验鉴定中心） | Jellyfish disaster early warning model construction method |
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