CN113273533B - Method for measuring diameter of medium-and-large-sized jellyfish umbrella in visual inspection - Google Patents
Method for measuring diameter of medium-and-large-sized jellyfish umbrella in visual inspection Download PDFInfo
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- CN113273533B CN113273533B CN202110517800.0A CN202110517800A CN113273533B CN 113273533 B CN113273533 B CN 113273533B CN 202110517800 A CN202110517800 A CN 202110517800A CN 113273533 B CN113273533 B CN 113273533B
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- 241000242583 Scyphozoa Species 0.000 title claims abstract description 116
- 238000011179 visual inspection Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011160 research Methods 0.000 claims abstract description 8
- 230000000007 visual effect Effects 0.000 claims description 21
- 238000011835 investigation Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 241001126326 Cyanea <Cnidaria> Species 0.000 description 1
- 241001615905 Nemopilema nomurai Species 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 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 large jellyfish in visual inspection, which comprises the following steps: (1) Extending the cross rod out of the ship board, and fixing an jellyfish collecting net at the top of the cross rod; (2) Placing the drainage mother collecting net in the sea, after visual inspection starts, enabling a survey boat to run at a constant speed, enabling scientific researchers to stand at observation points for visual inspection, and fixing the visual inspection time of each station at 5min; (3) If the visual inspection time is not finished and the net bags are filled with jellyfish, alternately collecting and releasing the two jellyfish collecting nets until the visual inspection time reaches 5min or the collected jellyfish quantity meets the statistical requirement; (4) And the scientific researchers use a measuring tool to measure and count the diameter of the large jellyfish on the deck one by one. The method can carry out real measurement of the umbrella diameter of the jellyfish obtained by visual inspection, and realizes quantitative judgment of the number and the size of jellyfish at each visual inspection station so as to ensure the integrity, scientificity and usability of jellyfish data information obtained by the visual inspection method and facilitate the development of subsequent jellyfish population dynamic analysis and research work.
Description
Technical Field
The invention relates to the technical field of marine organism resource monitoring, in particular to a method for measuring the diameter of a large jellyfish in visual inspection.
Background
In recent years, jellyfish (Sha Zhe Nemopilema nomurai, white jellyfish cyanea nozakishinouye, etc.) at the lower end of the food chain explodes due to deterioration of marine environment, excessive fishing, etc., and seriously affects the marine ecosystem, the food net structure, the fishery production, etc. Therefore, the development of the large jellyfish monitoring work has important significance for the early warning of the vigorous development of jellyfish and the research of the mechanism of the vigorous development.
The conventional large jellyfish monitoring method mainly comprises netting gear investigation, acoustic investigation, visual inspection and the like. Various monitoring methods are required to acquire jellyfish data information as much as possible, including jellyfish quantity, jellyfish size (umbrella diameter size) and the like. In the visual investigation, the visual investigation time is set during the navigation of a predetermined route by using a survey vessel, and the number of jellyfish is counted by visual investigation within a predetermined time, but the jellyfish size, that is, the umbrella diameter visual effect is not ideal because: 1) Is that the visual estimation is subject to error compared to the actual measurement; 2) The sea water is refracted, and the visual force and perceived measurement of objects in the sea are changed after the refraction; 3) The jellyfish is three-dimensional, and the visual observation of the shape is sometimes not suitable for estimating the umbrella diameter. Therefore, it is difficult to quantitatively determine the size of the large jellyfish obtained in the visual inspection process, and only qualitative determination of the size or the diameter of the umbrella is performed. The jellyfish data obtained by visual inspection in this way is not complete, and the jellyfish size data is lacking, so that the subsequent research and data comparison are influenced.
For the above reasons, it is highly desirable to provide a method for measuring the diameter of a jellyfish during the visual inspection of a large jellyfish, so as to ensure the integrity, scientificity and usability of jellyfish data information obtained by the visual inspection method.
Disclosure of Invention
Aiming at the difficult problem that the measurement of the size (umbrella diameter) of the jellyfish in the monitoring method of the large jellyfish visual inspection is difficult to quantify, the invention provides a capturing device and a capturing method for measuring the umbrella diameter of the large jellyfish in the visual inspection, which can capture the large jellyfish visual inspection and measure the umbrella diameter of the large jellyfish so as to realize quantitative judgment of the size of the jellyfish in the visual inspection.
The invention adopts the following technical means:
the method for measuring the diameter of the medium-and-large-sized jellyfish umbrella in visual inspection is characterized in that a fishing device is arranged on a survey ship, the fishing device comprises a bracket, a cross rod and a jellyfish collecting net, the brackets are fixed on the sides of the survey ship, one end of the cross rod is connected with the bracket, the other end of the cross rod is connected with the jellyfish collecting net, a net mouth of the jellyfish collecting net is a circular steel ring, a net is connected behind the net mouth, a net bag is connected behind the net cover, and meshes of the net bag are consistent with those of the net cover; 2 jellyfish collecting nets are arranged on two sides of the investigation ship;
the method comprises the following steps:
(1) Survey the ship navigation to appointed visual station, make the horizontal pole stretch out the ship board through the support operation, the horizontal pole head is fixed on support, horizontal pole middle part and stretch out the end top through rope and ship board fixed connection, lighten the horizontal bar and navigate the atress that appears because of the jellyfish in the netting gear in-process of ship, in order to guarantee the stability of horizontal pole in the use;
(2) Before formal work, a worker puts 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 mouth is adjusted to ensure that 90% of the area of the net mouth is below the sea surface, and then the rope length 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 mouth in the sea can be ensured only by putting the net mouth into the sea during normal work; after the visual inspection starts, a scientific research person stands at an observation point to conduct visual inspection, a survey ship runs at a constant speed according to a preset route, the visual inspection time is fixed at each visual inspection station for 5 minutes, and jellyfish observed by the eyesight enters a net bag of a jellyfish collecting net;
(3) If the visual inspection time unit of 5min is not finished and the jellyfish is filled in the net bag, the jellyfish collecting net is pulled up from the sea rapidly, collected jellyfish is released and concentrated on the deck, meanwhile, another jellyfish collecting net on the side of the ship board is put into the sea, if the jellyfish is filled in the net bag again, the jellyfish collecting net is pulled up, the first jellyfish collecting net which is released is put into the sea again, and the process is repeated until visual inspection is finished or the collected jellyfish quantity meets the requirement of statistics on the sample quantity;
(4) The scientific researchers measure and count the diameter of the jellyfish one by using a measuring tool for the large jellyfish concentrated on the deck.
Further, the cross rod is 2-2.5 m long, the diameter of the jellyfish collecting net mouth is 2-2.5 m, the length of the net is 2.5-3 m, and the length of the net bag is 2-2.5 m. The setting of the size of the cross bar and the size of the net mouth is used for capturing jellyfish in a visual range as much as possible, and in visual work, the observation radius, the size of the cross bar and the size of the net mouth can be adjusted according to actual conditions.
Further, the mesh size is 1cm, 3cm or 10cm.
Further, the survey vessel speed was 5 to 6 knots.
Further, the eye force observation range is a semicircle with a radius of 5 m-8 m by taking the center position of the bow as the center of the circle.
Compared with the prior art, the invention has the following advantages:
(1) In the large jellyfish visual measurement process, umbrella diameter measurement can be carried out on the jellyfish obtained by visual measurement, and quantitative judgment of jellyfish size in visual measurement is realized, so that the integrity, scientificity and usability of jellyfish data information obtained by a visual measurement method are ensured.
(2) The jellyfish quantity and jellyfish size data of each visual station can be accurately collected, and the subsequent jellyfish population dynamic analysis and research work can be conveniently carried out.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a fishing apparatus employed in the present invention;
wherein, 1-support, 2-horizontal pole, 3-jellyfish collecting net, 301-net gape, 302-net clothing, 303-net bag.
Detailed Description
The technical scheme 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 a investigation ship, the fishing device comprises a bracket 1, a cross rod 2 and a jellyfish collecting net 3, the bracket 1 is fixed on the sides of the investigation ship, one end of the cross rod 2 is connected with the bracket 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 cover 302 is connected behind the net opening 301, and a net bag 303 is connected behind the net cover 302; 2 jellyfish collecting nets 3 are arranged on two sides of the investigation ship; the diameter of the net mouth 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; according to the growth stage of large jellyfish, the mesh size is adjusted to be 1cm in the middle of 5 months to 6 months (the end stage of jellyfish dish-shaped body to the young jellyfish stage), 3cm in the middle of 6 months to 7 months (the young jellyfish to the adult jellyfish), and 10cm in the middle of 7 months to 10 months (the adult jellyfish stage); A. two positions B are the positions where the ship board is placed on the bracket, and AB is the length of the bracket; AC. BD is the length of the cross bar, 2 meters; EF. EG is visual radius, 5m; e is an observation point;
when the survey vessel was traveling at a constant speed of 5 knots according to a predetermined course, the visual inspection time for each visual inspection station was fixed at 5 minutes. After the investigation ship reaches the appointed visual station, the transverse bar extends out of the ship board through the operation of the support, the head of the transverse bar is fixed on the support, and the middle part and the top of the transverse bar are fixed on the ship board through connecting ropes. Before formal work, a worker puts 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 mouth is adjusted to ensure that 90% of the area of the net mouth is below the sea surface, and then the rope length 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 mouth in the sea can be ensured only by putting the net mouth into the sea during normal work; after the visual inspection starts, a scientific research person stands at the ship head observation point for visual inspection, the visual inspection range is a semicircle with the center of the ship head as the center and the radius of 5m, and meanwhile, other staff put the jellyfish collecting net fixed at the top of the cross rod into the sea, and most of jellyfish observed by the eye force can enter the net bags of the jellyfish collecting nets at the two sides of the ship. If too many jellyfishes are collected in the observation time, if the jellyfishes are fully filled in the net bags after 5min visual inspection, the jellyfishes net is quickly pulled up from the sea, collected jellyfishes are released and concentrated on a deck, meanwhile, another jellyfish collecting net is placed in the sea, if the net bags are fully filled again by the jellyfishes, the collecting net is pulled up, the first jellyfish collecting net which is completely released is placed in the sea again, the above processes are continuously repeated, and the jellyfish collecting net is alternately used to obtain more large jellyfishes until the visual inspection time of the visual inspection station position 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.
The visual inspection is used as a large jellyfish monitoring means, the statistics of the number mainly depends on visual inspection, and the statistics of jellyfish size is realized by the method. During working, scientific researchers measure and count the diameter of the jellyfish one by using a measuring tool for large jellyfish concentrated on the deck. If the number of the large jellyfish in each visual station is not more than 50, all measuring and sampling are carried out, otherwise, 50 head jellyfish diameter data are measured. Therefore, jellyfish quantity and jellyfish size data of each visual station can be collected, and follow-up jellyfish population dynamic analysis and research work can be conveniently carried out.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. The method for measuring the diameter of the medium-and-large-sized jellyfish umbrella in visual inspection is characterized in that a fishing device is arranged on a survey ship and comprises a bracket, a cross rod and jellyfish collecting nets, wherein the brackets are fixed on the ship sides of the two sides of the survey ship, one end of the cross rod is connected with the bracket, the other end of the cross rod is connected with the jellyfish collecting nets, net openings of the jellyfish collecting nets are circular steel rings, a net clothing is connected behind the net openings, net bags are connected behind the net clothing, and meshes of the net bags are consistent with meshes of the net clothing; 2 jellyfish collecting nets are arranged on two sides of the investigation ship;
the diameter of the jellyfish collecting net mouth is 2-2.5 meters, the length of the net is 2.5-3 meters, the length of the net bag is 2-2.5 meters, and the mesh size is 1cm, 3cm or 10cm;
the method comprises the following steps:
(1) The investigation ship sails to a specified visual station, the cross rod extends out of the ship board through the operation of the bracket, the head of the cross rod is fixed on the bracket, and the middle part and the top of the extending end of the cross rod are connected with the ship board through ropes;
(2) Before formal work, placing the jellyfish collecting net fixed at the top of the cross rod into the sea according to a preset ship speed, ensuring that 90% of the area of the net opening is below the sea surface by adjusting the length of the rope between the cross rod and the net opening, and fixing the rope length in the state; after the visual inspection starts, the investigation ship runs at a constant speed according to a preset route, and the visual inspection working time of each visual inspection station is fixed to be 5 minutes; the scientific research personnel stand at the observation point to carry out visual inspection, and the visual force observation range is a semicircle with the center of the bow as the center and the radius of 5-8 m; jellyfish observed by the eye force enters a net sac of a jellyfish collecting net;
(3) If the visual inspection time unit of 5min is not finished and the jellyfish is filled in the net bag, the jellyfish collecting net is pulled up from the sea rapidly, collected jellyfish is released and concentrated on the deck, meanwhile, another jellyfish collecting net on the side of the ship board is put into the sea, if the jellyfish is filled in the net bag again, the jellyfish collecting net is pulled up, the first jellyfish collecting net which is released is put into the sea again, and the process is repeated until visual inspection is finished or the collected jellyfish quantity meets the requirement of statistics on the sample quantity;
(4) The scientific researchers measure and count the diameter of the jellyfish one by using a measuring tool for the large jellyfish concentrated on the deck.
2. The method of claim 1, wherein the cross bar is 2 to 2.5 meters long.
3. The method of claim 1, wherein the survey vessel speed is 5 to 6 knots.
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CN107568173A (en) * | 2017-10-26 | 2018-01-12 | 浙江海洋大学 | A kind of quantitative collection method of top layer colloid jellyfish |
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CN103053481A (en) * | 2013-01-11 | 2013-04-24 | 国家***北海环境监测中心 | Quantitative sampling netting gear for large jellyfishes in oceanic surface layers |
CN205455456U (en) * | 2015-12-15 | 2016-08-17 | 上海航盛船舶设计有限公司 | Ship is catched to two otter board krills of two booms |
CN109068617B (en) * | 2016-02-23 | 2021-05-25 | 创新海洋***股份有限公司 | Aquaculture fish fence with dead object catching device |
CN205567480U (en) * | 2016-04-29 | 2016-09-14 | 辽宁省海洋水产科学研究院 | Jellyfish acetabulum culture apparatus |
CN206333231U (en) * | 2016-11-15 | 2017-07-18 | 浙江省海洋水产研究所 | A kind of automatic lift net formula fishing gear for fishing for simultaneously subregion collection fish shrimp crab |
CN206192240U (en) * | 2016-11-29 | 2017-05-24 | 辽宁省海洋水产科学研究院 | Jellyfish umbrella portion diameter measuring device |
CN108502113B (en) * | 2018-04-28 | 2020-08-28 | 广东海洋大学 | Fishing system |
CN108782478A (en) * | 2018-08-03 | 2018-11-13 | 中国水产科学研究院东海水产研究所 | Jellyfish intercepts finishing device and its application method |
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Publication number | Priority date | Publication date | Assignee | Title |
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KR20180071554A (en) * | 2016-12-20 | 2018-06-28 | 한밭대학교 산학협력단 | the Young of fishes protective device for Inverted fish trap |
CN107568173A (en) * | 2017-10-26 | 2018-01-12 | 浙江海洋大学 | A kind of quantitative collection method of top layer colloid jellyfish |
CN112613239A (en) * | 2020-11-24 | 2021-04-06 | 国家***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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