CN103162733A - Eriocheir sinensis juvenile crab density measuring method at Yangtze estuary - Google Patents
Eriocheir sinensis juvenile crab density measuring method at Yangtze estuary Download PDFInfo
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- CN103162733A CN103162733A CN2013100206226A CN201310020622A CN103162733A CN 103162733 A CN103162733 A CN 103162733A CN 2013100206226 A CN2013100206226 A CN 2013100206226A CN 201310020622 A CN201310020622 A CN 201310020622A CN 103162733 A CN103162733 A CN 103162733A
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- juvenile crab
- eriocheir sinensis
- vasculum
- net
- string bag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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Abstract
The invention discloses an eriocheir sinensis juvenile crab density measuring method at Yangtze estuary. A push net type eriocheir sinensis juvenile crab gathering device is prepared for the eriocheir sinensis juvenile crab density measuring method at Yangtze estuary. The eriocheir sinensis juvenile crab density measuring method at Yangtze estuary is characterized in that the push net type eriocheir sinensis juvenile crab gathering device is composed of a push rod, a connecting rod, a gathering box, a fixing rod, a net bag, a cone-shaped net, a current meter, a dipsey, a float and a fishing wire. The push net type eriocheir sinensis juvenile crab gathering device utilizes that the pushing rod is fixed on the front portion of a nose of a juvenile crab sampling ship in a suspending manner, the juvenile crab sampling ship pushes the gathering device to go forward at a uniform velocity, and the current meter records flow velocity of water relative to a ship body, and records sampling time and the amount of the gathered juvenile crabs; the juvenile crab density is calculated through an equation of p= S/(T*V*1.2), wherein S stands for the amount of the gathered juvenile crabs, a unit is one; T is the sampling time, the unit is hour; V is the flow velocity of water relative to the ship body, the unit is meter per hour, 1.2 is the area of gathering box net opening, and the unit is square meter. The eriocheir sinensis juvenile crab density measuring method at Yangtze estuary can provide basis for protecting juvenile crab habitats and recovering ecology at Yangtze estuary.
Description
Technical field
The present invention relates to the density inspect method of juvenile crab.
Background technology
Eriocheir sinensis claims again river crab, steamed crab, is one of aquatic products of liking very much of China people.Eriocheir sinensis distributes very wide in China, formed take the Changjiang river, the Oujiang River, the Liaohe River be the main large population of Eriocheir sinensis 3, and wherein Yangtze Population all is better than other two populations at aspects such as proterties, output.The entrance of Changjiang River is the maximum optimum Eriocheir sinensis natural spawning site of China, and in last century Mo in annual May, the steamed crab culturist comes entrance of Changjiang River panic buying juvenile crab one after another, and natural juvenile crab is sold for 80,000 yuan/jin, is called as " soft gold in water ".The juvenile crab that the spawning ground, entrance of Changjiang River produces has irreplaceable vital role because of its good germplasm in the Eriocheir sinensis industry, supporting the high speed development of China's Eriocheir sinensis industry.At present, carry out instrument that the Eriocheir sinensis juvenile crab gathers in Changjiang River Estuary and comprise that the diddle-net, net bamboo weir, the ship that use plastic window screening or tygon bolting silk to make choose net etc.The time that waters, entrance of Changjiang River juvenile crab plays flood generally at the annual lunar calendar by the end of May, when at the incoming tide, juvenile crab trace back the river and on, just can utilize this moment diddle-net, net bamboo weir, ship to choose the sampling instrument such as net and fish for.In addition, carry out the method that juvenile crab fishes for and also have miniflow water mass trapping, lamp light trapping method; Bait is copied laws on arrests; Copy laws on arrests etc.The Eriocheir sinensis juvenile crab sent out between flood season in the entrance of Changjiang River; accurately grasping juvenile crab density and quantity fishes for scientific research all significant for production; yet less for entrance of Changjiang River juvenile crab density research at present; basically be in qualitative description and experience evaluation stage; lack and assess accurately numerical value; therefore in the urgent need to inventing the method for quantitatively determining of a kind of entrance of Changjiang River Eriocheir sinensis juvenile crab density; accurately grasp the eigenwert of juvenile crab density, in order to provide theoretical foundation and reference for entrance of Changjiang River juvenile crab habitat protection, restoration of the ecosystem and ecological risk assessment etc.
Summary of the invention
The present invention need to solve is a kind of method that density measurement for entrance of Changjiang River Eriocheir sinensis juvenile crab provides simple and easy to do, precise and high efficiency, thereby provides reference for entrance of Changjiang River juvenile crab habitat protection, restoration of the ecosystem and ecological risk assessment.
technical scheme of the present invention is at first to be equipped with the formula Eriocheir sinensis juvenile crab harvester of pushing net, it is characterized in that described harvester is by push rod, connecting link, vasculum, fixed bar, the string bag, conic net, current meter, sinker, float, the fishing rope forms, vasculum is rectangular frame structure, length and width are high is respectively 1.8 meters, 1.5 rice and 0.8 meter, side up and down and the left and right side of vasculum are wrapped up by etting, and use the fishing lines colligation, the vasculum front is uncovered, 1 current meter of the anterior binding of vasculum, the vasculum rear end is connected with 1 tetragonal conic net network interface, conic net length is 2 meters, the conic net rear end connects the string bag of 1 rectangular parallelepiped, string bag length and width are high is respectively 0.6 meter, 0.5 rice and 0.4 meter, tighten string bag bottom, prevent that juvenile crab from escaping, connect float with the fishing rope above the string bag, connect sinker with the fishing rope below the string bag, the string bag is suspended in water, make vasculum, the mesh specification of the etting of conic net and the string bag is every square centimeter of 28-32 order, the vasculum both sides are connected with two push rods that are located at the top with connecting link respectively, two push rod front ends and middlely connect into rectangular frame with fixed bar, the formula of pushing net Eriocheir sinensis juvenile crab harvester utilizes the push rod unsettled fore front of being fixed in the juvenile crab sampling boat, utilizing the juvenile crab sampling boat to promote harvester at the uniform velocity moves ahead, utilize current meter to record water body with respect to the flow velocity of hull, and record the time of sampling and the juvenile crab quantity of collection, then calculate juvenile crab density by formula ρ=S ÷ (T * V * 1.2), wherein S is the juvenile crab quantity of collection, and unit is only, T is the time of sampling, and unit is hour, V be water body with respect to the flow velocity of hull, unit is m/h, 1.2 be the area of vasculum network interface, unit is square metre.
Outstanding feature of the present invention is that assay device structures is simply efficient, is easy to promote, and whole juvenile crab sampling operation simple flow is feasible.This method is measured from Real-time and is sent out, and can measure juvenile crab density by qualitative assessment, can provide reference data accurately for fishing and the scientific research of the Changjiang river Eriocheir sinensis juvenile crab.
Description of drawings
Fig. 1 is the formula of the pushing net Eriocheir sinensis juvenile crab harvester schematic diagram that this method is equipped with.
Embodiment
at first be equipped with the formula Eriocheir sinensis juvenile crab harvester of pushing net, this harvester is by push rod 1, connecting link 3, vasculum 4, fixed bar 6, the string bag 7, conic net 2, current meter 10, sinker 9, float 5, fishing rope 8 forms, vasculum is rectangular frame structure, length and width are high is respectively 1.8 meters, 1.5 rice and 0.8 meter, side up and down and the left and right side of vasculum are wrapped up by etting, and use the fishing lines colligation, the vasculum front is uncovered, 1 current meter of the anterior binding of vasculum, the vasculum rear end is connected with 1 tetragonal conic net network interface, conic net length is 2 meters, the conic net rear end connects the string bag of 1 rectangular parallelepiped, string bag length and width are high is respectively 0.6 meter, 0.5 rice and 0.4 meter, tighten string bag bottom, prevent that juvenile crab from escaping, connect float with the fishing rope above the string bag, connect sinker with the fishing rope below the string bag, the string bag is suspended in water, make vasculum, the mesh specification of the etting of conic net and the string bag is every square centimeter of 28-32 order, the vasculum both sides are connected with two push rods that are located at the top with connecting link respectively, two push rod front ends and middlely connect into rectangular frame with fixed bar, the formula of pushing net Eriocheir sinensis juvenile crab harvester utilizes the push rod unsettled fore front of being fixed in the juvenile crab sampling boat, utilizing sampling boat to promote harvester at the uniform velocity moves ahead, utilize current meter to record water body with respect to the flow velocity of hull, and record the time of sampling and the juvenile crab quantity of collection, then calculate juvenile crab density by formula ρ=S ÷ (T * V * 1.2), wherein S is the juvenile crab quantity of collection, and unit is only, T is the time of sampling, and unit is hour, V be water body with respect to the flow velocity of hull, unit is m/h, 1.2 be the area of vasculum network interface, unit is square metre.Said method carries out sampling determination juvenile crab density on June 15th, 2011 in north branch of Yangtze River Estuary, 0.5 hour sampling time, flow velocity 1 meter per second (3600 m/hs) of current meter record, gathering juvenile crab quantity is 1360, juvenile crab density p=1360 ÷ (0.5 * 3600 * 1.2)=0.63/m
3, accurately reflected the density feature of entrance of Changjiang River sampling at that time waters juvenile crab.
Claims (1)
1. entrance of Changjiang River Eriocheir sinensis juvenile crab density inspect method, the present invention is equipped with the formula Eriocheir sinensis juvenile crab harvester of pushing net, and it is characterized in that described harvester is by push rod, connecting link, vasculum, fixed bar, the string bag, conic net, current meter, sinker, float, the fishing rope forms, and vasculum is rectangular frame structure, and length and width are high is respectively 1.8 meters, 1.5 rice and 0.8 meter, side up and down and the left and right side of vasculum are wrapped up by etting, and use the fishing lines colligation, the vasculum front is uncovered, 1 current meter of the anterior binding of vasculum, vasculum rear end are connected with 1 tetragonal conic net network interface, and conic net length is 2 meters, the conic net rear end connects the string bag of 1 rectangular parallelepiped, and string bag length and width are high is respectively 0.6 meter, 0.5 rice and 0.4 meter, tighten string bag bottom, prevents that juvenile crab from escaping, and connects float with the fishing rope above the string bag, connects sinker with the fishing rope below the string bag, the string bag is suspended in water, the making vasculum, the mesh specification of the etting of conic net and the string bag is every square centimeter of 28-32 order, the vasculum both sides are connected with two push rods that are located at the top with connecting link respectively, two push rod front ends and middlely connect into rectangular frame with fixed bar, the formula of pushing net Eriocheir sinensis juvenile crab harvester utilizes the push rod unsettled fore front of being fixed in the juvenile crab sampling boat, utilizing the juvenile crab sampling boat to promote harvester at the uniform velocity moves ahead, utilize current meter to record water body with respect to the flow velocity of hull, and record the time of sampling and the juvenile crab quantity of collection, then calculate juvenile crab density by formula ρ=S ÷ (T * V * 1.2), wherein S is the juvenile crab quantity of collection, and unit is only, T is the time of sampling, and unit is hour, V be water body with respect to the flow velocity of hull, unit is m/h, 1.2 be the area of vasculum network interface, unit is square metre.
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| CN2013100206226A CN103162733A (en) | 2013-01-21 | 2013-01-21 | Eriocheir sinensis juvenile crab density measuring method at Yangtze estuary |
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| CN2013100206226A CN103162733A (en) | 2013-01-21 | 2013-01-21 | Eriocheir sinensis juvenile crab density measuring method at Yangtze estuary |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606496A (en) * | 2009-07-13 | 2009-12-23 | 大连獐子岛渔业集团股份有限公司 | Japanese scallop sea area breeding method |
| CN201509513U (en) * | 2009-06-19 | 2010-06-23 | 中国水产科学研究院长江水产研究所 | River fish collection device |
| CN102017920A (en) * | 2010-11-05 | 2011-04-20 | 大连獐子岛渔业集团股份有限公司 | Method for collecting indoors cultivated natural patinopecten yesoensis larvae by trawling |
| CN102487868A (en) * | 2011-12-09 | 2012-06-13 | 中国水产科学研究院淡水渔业研究中心 | Coreius heterodon fry collection, holding culture and long-distance transportation method |
| CN102805057A (en) * | 2012-07-16 | 2012-12-05 | 宁波大学 | Nondestructive catching method for blue crab seeds |
| CN202603425U (en) * | 2012-06-07 | 2012-12-19 | 福建省水产研究所 | Seed collecting net cage device |
-
2013
- 2013-01-21 CN CN2013100206226A patent/CN103162733A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509513U (en) * | 2009-06-19 | 2010-06-23 | 中国水产科学研究院长江水产研究所 | River fish collection device |
| CN101606496A (en) * | 2009-07-13 | 2009-12-23 | 大连獐子岛渔业集团股份有限公司 | Japanese scallop sea area breeding method |
| CN102017920A (en) * | 2010-11-05 | 2011-04-20 | 大连獐子岛渔业集团股份有限公司 | Method for collecting indoors cultivated natural patinopecten yesoensis larvae by trawling |
| CN102487868A (en) * | 2011-12-09 | 2012-06-13 | 中国水产科学研究院淡水渔业研究中心 | Coreius heterodon fry collection, holding culture and long-distance transportation method |
| CN202603425U (en) * | 2012-06-07 | 2012-12-19 | 福建省水产研究所 | Seed collecting net cage device |
| CN102805057A (en) * | 2012-07-16 | 2012-12-05 | 宁波大学 | Nondestructive catching method for blue crab seeds |
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Application publication date: 20130619 |