CN104181009B - A kind of quantitative frame of zoobenthos collection - Google Patents

Abstract

The present invention provides a kind of quantitative frame of zoobenthos collection, it is characterised in that including：The certain framework of enclosed area；It is connected to the recovery rope of the framework；And it is connected to the framework, for making the framework be temporarily fixed to gather the water-bed fixing component of environment.

Description

A kind of quantitative frame of zoobenthos collection

Technical field

Dwelt the present invention relates to a kind of quantitative frame of zoobenthos collection, more particularly to the bottom of the collection environment stronger suitable for current The quantitative frame of animal collection.

Background technology

In surface water body, there is many planktonic organisms and zoobenthos, its to water environment evaluation monitoring, Hydrobiology, Ecological study has a very important value, people successively invented biological and zoobenthos the sampling apparatus of various floating and Method.

As plankton collecting device, plankton net is most commonly seen, according to survey objective, can be carried out with it The qualitative survey of planktonic organism and quantitative interview, or even qualitative research can also be carried out to the sand grain in water body with it.However, It still suffers from following deficiency：

In the quantitative interview of zooplankter, drainage amount is big (being usually 20L~50L water bodys), to field sampling personnel's Physical consumption is larger；

For the river of some severe contaminations, there are many volatile contaminants, in quantitative collection zooplankter, to sampling The healthy threat of person is larger；

Content of the sample contents (such as sand grain) of each grain-size grade in water body and they it can not accurately be quantified Between ratio.

In addition, as zoobenthos harvester, the difference of survey objective according to as qualitative survey and quantitative interview, Conventional quantitative interview instrument has：The inferior bottom sampler of Peter and its improvement type, it sinks under water by own wt, takes out certain face Long-pending bed mud, so as to calculate the quantity of zoobenthos in monitoring waters；Suo Bai nets, it is by the bottom in the sample boxes of certain area Matter is transferred in the string bag, so as to be collected into zoobenthos.Common qualitative survey instrument has D type nets, and it is by the bed mud of sampled point Etc. being collected into the string bag, then filter, screening obtains zoobenthos；Right angle net (operating type is identical with D type nets)；Artificial substratum Class sampling tool, is placed on sampled point for a period of time, after zoobenthos freely creeps into it, is collected, analyzes.So And, above-mentioned sampling tool exists following not enough：

In current zoobenthos sampling instrument, comprehensive universal deficiency, not yet occur it is a be applied to different water depth, and It is provided simultaneously with qualitative collection and the zoobenthos harvester of quantitative collection function；

The sampling tools such as above-mentioned sampling instrument, particularly D types net and rope uncle's net, need sample collector to carry sampling tool and paddle Sampling, therefore when the water body environment of sampling to be investigated is Mud Sediment or winter subglacial, physical efficiency requirement, protection to sample collector It is required that all very high；

To contaminative river, there are many noxious pollutants, when using above-mentioned zoobenthos sampling tool, often with water body Contact is more, and the threat to sample collector is larger；

In addition, artificial substratum class sampling tool is due to needing zoobenthos freely to creep into it, thus generally require by It is placed on a period of time (general 8 weeks or so) in investigation waters, and time-consuming for investigation, is unsuitable for large watershed flow-type sampling tune Look into, and investigation apparatus is easy by artificial destruction in placement process.

The content of the invention

The present invention is in view of researching and developing the problem of above-mentioned various existing sampling apparatuses.The present invention a technical scheme be A kind of quantitative frame of zoobenthos collection, including：The certain framework of enclosed area；It is connected to the recovery rope of the framework；And even It is connected to the framework, for making the framework be temporarily fixed to gather the water-bed fixing component of environment.

The fixing component can be anchor, pouring weight or be located at the fixed nail of at least diagonal position of the framework.It is described Fixed nail can be located at the upper and lower surface side of the framework.

The framework can be right-angled U, be had on two sides of the U-frame for making adopting with limit component The chute that suction nozzle is stretched into and slided.Now, the fixing component be located at respectively the U-frame frame two bottom comers and its The fixed nail of the open end of two sides, fixation nail can be located at two bottom comers and two side of the framework The upper and lower surface side of open end.

Can be at least diagonal position of the framework or two bottom comers of the U-frame frame and two side Open end is connected to buoy.

Brief description of the drawings

Fig. 1 is the overall structure figure of the aquatile harvester of the embodiment of the present invention.

Fig. 2 be illustrate the embodiment of the present invention adopt the structural representation for inhaling device and its variation.

Fig. 3 is the figure of the construction for the quantitative frame and its variation for illustrating the present invention.

Fig. 4 be illustrate another variation quantitative frame construction and its with the figure for the cooperation for adopting suction nozzle.

Fig. 5 is the schematic diagram for the mechanism that explanation makes that classified filtering device rocks.

Fig. 6 is the structural representation for illustrating the sample collection device of the present invention.

Fig. 7 is the schematic diagram for the construction for illustrating the comb that the delivery port of suction pump is connected.

Fig. 8 is to illustrate the overall structure figure using aquatile harvester during vacuum suction mode.

Embodiment

Illustrate the present invention below by way of embodiment, but embodiment is only to illustrate, and is not constituted to present invention guarantor Protect the limitation of scope.

Illustrate the summary of the aquatile harvester of the present invention first.Fig. 1 is that the aquatile of the embodiment of the present invention is adopted The overall structure figure of acquisition means.The aquatile harvester of the embodiment of the present invention mainly includes adopting suction device 100 on the whole, divided Level filter 200, main body 300, sample collection device 400, suction pump 500, drainage collection device 600.Below for each Constitutive requirements are illustrated respectively.

(adopting suction device)

Fig. 2 be illustrate the embodiment of the present invention adopt the structural representation for inhaling device and its variation.As shown in Fig. 2 (a), Adopting suction device 100 includes adopting suction nozzle 101a, sucker rod 102.Suction nozzle 101a is adopted for long barrel shape, internal cavities are square along its length To being provided with elongated suction inlet.Sucker rod 102 is hard blank pipe, is easy to holding operation and control to adopt suction nozzle 101a movement, this is taken out One end of soup stick 102 is assemblied in the approximate mid-section position for adopting suction nozzle 101a length directions, the internal cavities with adopting suction nozzle 101a It is connected, when starting of pump station described later, adopts suction nozzle 101a and be based on its suction force and draw the aquatic biochron, the water and water drawn The objects to be checked such as raw biology are inhaled into sucker rod 102.The other end of sucker rod 102 can be connected with conduit 103 (not shown), The conduit 103 is soft conduit, is easy to the Object Oriented OO to be checked main body 300 described later by suction nozzle 101a absorptions are adopted.Need herein Illustrate, sucker rod 102 not adopts the essential features for inhaling device, for example, can also make to adopt leading for suction nozzle 101a and hard Pipe 103 is joined directly together, or separately by controlling to adopt suction nozzle with adopting the control stick of suction nozzle 101a bindings outside conduit 103 101a。

In addition, when being collected sampling to zoobenthos, because zoobenthos is freely distributed unlike planktonic organism In water body, but generally live in the more environment of the debris such as shale or cobble substrate, therefore only adopted sometimes with above-mentioned Suction nozzle 101a can not efficiently carry out pumping sample.For suitable for such sampling environment, the present inventor proposes as follows Variation adopts suction nozzle.

As shown in Fig. 2 (b), this variation adopt suction nozzle 101b it is above-mentioned adopt suction nozzle 101a on the basis of, in suction inlet Side is placed with the harrow nail of some teeth along suction inlet direction.When being collected sampling, cobble or impurity are pushed aside using the harrow nail, And disturbance is hidden in zoobenthos therein, while zoobenthos suction is adopted into suction nozzle 101a by suction inlet.Thus, can be by water Lump (such as stone, the fallen leaves, rubbish) rake at bottom is opened, also, can disturb the zoobenthos of respective regions, is easy to suction Collection.It is preferred that harrow nail to be arranged in the scanning direction advance side of suction inlet.In addition it is also possible to all be arranged with the rake in the both sides of suction inlet Nail, in order to which the shuttle-scanning for adopting suction nozzle is aspirated.

In addition, Fig. 2 (c) is proposed and another is adopted suction nozzle with harrow nail.This adopts suction nozzle 101c generally wolf's fang rod shapes, Caput is general cylindrical shape, and columnar one end closing, the other end is communicated in conduit 103, spread along columnar side surface circumference There are some harrow nails prominent laterally, the space between each harrow nail is scattered with suction inlet.Utilize the suction nozzle of adopting of the shape, same energy Water-bed lump (such as stone, fallen leaves, rubbish) rake is opened, while the zoobenthos of respective regions can be disturbed, is easy to Suction collection.

In addition, Fig. 2 (d) is proposed and another is adopted suction nozzle with harrow nail.This adopts suction nozzle 101d generally seedpod of the lotus head, lotus Some harrow nails prominent laterally are scattered with the general plane part of fluffy head, the space between each harrow nail is scattered with suction inlet. Using the suction nozzle of adopting of the shape, water-bed lump (such as stone, fallen leaves, rubbish) rake can equally be opened, meanwhile, it can disturb The zoobenthos of dynamic respective regions, is easy to suction to gather.

Furthermore it is preferred that the gross area of the suction inlet shown in (a) of figure 2 above~(d), with sucker rod (or conduit) and adopting suction The sectional area of head connection quite, swabbing pressure during suction is adopted with guarantee.

(quantitative frame)

In addition, when needing to carry out the quantitative collection of such as zoobenthos, quantitative frame can be set to adopt suction device to coordinate 100 work.Fig. 3 is the figure of the construction for the quantitative frame and its variation for illustrating the present invention.Fig. 3 (a) shows a kind of quantitative frame 104, it includes the framework 1041 of rectangle (containing square), is connected to the recovery rope 1042 of framework 1041, is connected to framework 1041 fixation anchor 1043.

A pair of length of sides of design framework 1041, make its one side and the above-mentioned suction inlet length phase for adopting suction nozzle (101a or 101b) When, and design its another pair length of side so that the quantitative area needed for meeting.

The one end for reclaiming rope 1042 is connected to quantitative frame 1041, and the other end is grasped by user, for reclaiming quantitative frame.

Because in quantitative collection zoobenthos, quantitative frame 104 is actually positioned at the bottom, especially stronger in current When, quantitative frame is easily moved, and causes the area inaccurate for intending quantitative collection.Therefore fixed anchor 1043 is set so that quantitative Frame 104 falls into behind the bottom and is not moved.Herein it should be noted that as long as the position of quantitative frame 104 can temporarily be fixed Component, however it is not limited to above-mentioned fixation anchor 1043, for example, can also be pouring weight 1044 as shown in Fig. 3 (b), or Person sets fixed nail 1045 as shown in Fig. 3 (c) at least diagonal position of framework 1041 (being four corners in this example), So that when quantitative frame 104 is placed in into the bottom, fixed nail 1045 can stretch into the mud or crack of stone at the bottom, so that accurately fixed fixed Measure frame 104.At this time it is also possible to which the upper and lower surface in framework 1041 sets fixed nail 1045 respectively so that no matter framework 1041 falls Which is face-down when entering the bottom, and can be transferred through respective face fixes the effectively fixed position of nail 1045.Further, it is also possible to such as Fig. 3 (d) shown in connect floating by cotton rope respectively at least diagonal position (in this example for four corners) position of framework 1041 like that Mark 1046, buoy 1046 can not only make quantitative frame 104 smoothly fall into the bottom according to required posture, be also used as quantitative frame 104 station location marker is played a role, especially in the sampling environment of water turbidity, and this effect is protruded very much.Certainly, buoy 1046 gross buoyancy is less than quantitative frame 104 weight of itself, to enable quantitative frame 104 to sink under water.

Certainly, above-described quantitative frame is applicable not only to the aquatile harvester of the present invention, moreover it is possible to effectively fit Zoobenthos harvester for prior art, such as the primary net of rope, D types net, right angle net.

In addition, Fig. 4 be illustrate another variation quantitative frame 104 construction and its with the figure for the cooperation for adopting suction nozzle 101. As shown in figure 4, quantitative frame 104 is right angle " u "-shaped, have chute 105 on two sides of the " u "-shaped frame, base length with The length for adopting suction nozzle 101 is engaged.In addition, as shown in figure 4, what the two ends for adopting suction nozzle 101 were protruded laterally with one respectively Limit component 106, in the present embodiment, the limit component 106 are the nail-like with minor diameter part and large-diameter portion, the one of minor diameter part End is connected to the side for adopting suction nozzle 101, and the other end is connected to large-diameter portion.The path length of minor diameter part is slightly less than the chute of quantitative frame 104 105 width so that chute can be stretched into and moved along chute；The path length of large-diameter portion is more than the width of chute 105 so that work as path When portion is stretched into chute, large-diameter portion is stuck in the outside of quantitative frame 104, and shifting of the suction nozzle 101 on the direction of quantitative frame base is adopted in limitation It is dynamic.Thus, when to use quantitative frame 104, the minor diameter part of limit component 106 at the two ends of suction nozzle 101 will be adopted respectively from correspondence cunning One end of groove is slipped into, under the limitation of large-diameter portion, and adopting suction nozzle 101 can only move along chute 105.Adopting the length one of suction nozzle 101 In the case of fixed, by the length of the chute on the side of the quantitative frame of design, required quantitative area can be just acquired.

In addition, fixation anchor, weight block, the technical characteristic for fixing nail, buoy on above-described quantitative frame, quantitative Frame can also have therein a variety of simultaneously, will now have the technique effect that each feature is brought concurrently.

(classified filtering device)

Return to the unitary construction that classified filtering device 200 is shown in Fig. 1, Fig. 1.In the example in fig 1, classified filtering is filled Put including three layers of screen 201,202,203 being arranged on being inclined relative to horizontal on the screen frame 301 of main body 300.Three Metafiltration sieve 201,201,203 sieve aperture (mesh) successively reduce, so as to sort out different-grain diameter object to be checked (for example float Swim biology, zoobenthos, sand grain etc.).The specific size of the sieve aperture of each metafiltration sieve needs design i.e. according to actual sampling Can.

In addition, screens at different levels are set with certain angle of inclination with respect to the horizontal plane so that be fed into the to be checked of screen Object can flow downward while being filtered, so as to compared with when horizontally disposed screen, be more beneficial under gravity on one side Object to be checked being uniformly distributed on screen, ensure the effect that fully filters, also help the collection of sample collection device, i.e. Because screen is inclined, as long as therefore screen lower end set sample collection device 400, the filtrate being filtered out will be in water It is collected into automatically in sample collection device 400 under the washing away of stream, operation is collected without specially carrying out cleaning again.

The state installed while three metafiltration sieve parallel oblique is illustrated that in Fig. 1, screen series is not limited to three layers, for example, also may be used To be one layer, preferably more than two layers, more preferably more than three layers, it can increase or decrease as needed.Multilayer screen is not yet Necessarily parallel oblique, can respectively set according to adequacy requirement of the states (such as flow velocity, flow) of current or filtering etc. The angle of inclination of fixed each layer.In addition, each metafiltration sieve may not be and tilt in one direction, but intersected with "the" shape state and inclined Tiltedly.

In addition, when the water turbidity aspirated up is larger, can to improve the efficiency of filtering, strengthening the effect of filtering So that each metafiltration sieve is rocked.On realizing the mechanical realization rocked, for example, it can will be rotated and turned using crank connecting rod apparatus Reciprocating theory of mechanics is turned to, such as shown in Fig. 5 (a), crank shaft device is installed in the side of screen frame 301 302, and respectively by connecting rod connecting crank shaft device 302 and screen at different levels, specifically, one end of connecting rod is with can be along crank axle The mode that freely rotates of circumferencial direction be connected to the crank-pin of crank shaft device 302, the other end is in mode free to rotate It is connected to screen.In addition, the head and the tail two ends of screens at different levels are respectively erected on the slide rail set by screen frame 301 so that filters at different levels Sieve can slide laterally under the drive of crank connecting rod apparatus along slide rail.As the manner of screens at different levels, herein exemplified with cunning Rail, but it is also possible to using other machinery construction, such as four angles of each metafiltration sieve are messenger wire can be hung by way of Free Slosh Hang on last layer screen or screen frame 301, thus, when making the main axis of crank shaft device 302, crank-pin drivening rod Move back and forth, and then drive each metafiltration sieve regularly to rock.In addition it is also possible to only make the screen 201 of the superiors be connected to song Arbor device 302, other each metafiltration screenings are not relatively fixed for example, by the mode of welding and the screen 201 of the superiors, by This, when the superiors' screen 201 is rocked with crank shaft device 302, below each metafiltration sieve is also synchronous rocks.

One is these are only, the mechanical schemes rocked are also not necessarily limited to crank axle linkage, for example, can also pass through cam The any-modes such as device, connecting rod of eccentric wheel device realize this effect.In addition, being also not necessarily limited to make each metafiltration sieve is synchronous to rock, only The object to be checked after the screen filtering of upper strata can be received entirely by ensureing the screen of lower floor, and certain layer can also be only made as needed Screen rock.

Illustrated above screen frame is motionless, make the relative example rocked of each metafiltration sieve.In addition, can also be such as Fig. 5 (b) each metafiltration sieve is relatively fixed with screen frame shown in like that, whole filter is driven by the crank shaft device 302 for being installed on main body Screen frame (unit) and screen are rocked relative to main body.

In addition, when the aspirator using vacuum suction mode described later, can be by being installed on the crank axle of main body Device 302 drives whole suction filtration case to be rocked relative to main body.

(sample collection device)

The general structure of the sample collection device 400 of the embodiment of the present invention is shown in Fig. 1.In the embodiment in figure 1, sample 400 points of product collection device is two kinds -- basket type collector 400a and funnel type collector 400b.As shown in Fig. 6 (a), basket type is received Storage 400a is the basket that bottom plate is scattered with the sieve aperture consistent with the slot size of the screen of corresponding stage, is typically installed at most upper The tail end of metafiltration sieve 201, the purpose is to collect larger-size object to be checked that the superiors' screen 201 is filtered out etc., and passes through Its filter opening will likely drain to the funnel type collector 400b of lower floor containing the water body of object to be checked.

As shown in Fig. 6 (b), funnel type collector 400b include being installed in bell mouth 400b1 at the tail end of screen, Sectional area from bell mouth 400b1 gradually downward the convergent cone-shaped collection face 400b2 in side, be connected to cone-shaped collection face 400b2's The collector 400b3 of the bottom and controlled valve 400b4 installed in collector 400b3 bottom, the funnel type collector 400b bell mouth is designed to receive the filtrate that corresponding screen is filtered out completely.As needed, can also be in the cone The sieve aperture consistent with the slot size of the screen of corresponding stage is spread on shape collection surface 400b2, with further fully filtering.In addition, It is with graduated transparent collector that collector 400b3, which can also be made,.Herein it should be noted that above-mentioned basket type collector 400a and non-invention necessary constitutive requirements, can also be not provided with basket type collector 400a and all set leakage for each metafiltration sieve Bucket type collector 400b carrys out sample grading sample.

(aspirator)

As shown in fig. 7, aspirator has suction pump 500, can be conventional water pump, in main body 300, it enters The mouth of a river is connected to the conduit 103 adopted and inhale device 100, and delivery port arranges water the superiors' screen 201 to classified filtering device 200, It is preferred that arranging to its initiating terminal.Now, to make the water that suction comes up arrange as homogeneously as possible to screen 201, can as shown in Figure 7 that Sample makes the delivery port of suction pump 500 be connected to the comb 501 with the discharge outlet concordant with the initiating terminal of screen 201.Comb 501 Discharge outlet be erected near the initiating terminal of screen 201.

In addition, to avoid object to be checked, particularly aquatile from being crushed by water pump, it would however also be possible to employ the side of vacuum suction Formula.Specifically, classified filtering device 200, main body 300, sample collection device 400 be placed in as shown in Figure 8 closed In suction filtration case 701, make to produce negative pressure in suction filtration case by suction filter pump (vavuum pump), based on the negative pressure, connected via conduit 103 Adopting suction device 100 and will produce suction in suction filtration case, realizes the purpose adopted and absorb collection.

(drainage collection device)

Reference picture 1, main body 300 is provided with drainage collection device 600 in the lower section of multilayer screen, in the drainage collection device Post processing is collected so as to which each metafiltration to be sieved through to the water after filter in 600 bottom equipped with the controlled valve 601 that drainage is bled off can be made.This Outside, drainage collection device 600 can also be transparent material, and with the scale for being used to weigh drainage volume, quantitatively to adopt Concentration regard the amount of drainage as quantitative foundation.

In addition, described in the explanation such as (b) previously for Fig. 5, making screen frame and each metafiltration sieve integrally phase When being rocked for pedestal, funnelform drainage collector can be set below orlop screen, and lead to as shown in the figure Cross the funnelform drainage collection device 600 that flexible pipe is connected to lower section.By using the flexible pipe connection for ensureing abundant length, energy Only make screen frame and each metafiltration sieve entirety to rock, without making the larger drainage collection device of the quality for filling drainage of lower section 600 rock together, therefore can reduce the load for rocking power source (such as crank shaft device).

Similarly, in the aspirator of vacuum suction mode utilized as noted above, can as shown in Fig. 5 (c), It is provided for collecting in suction filtration bottom portion and exports the flexible pipe of drainage, the other end of flexible pipe is sealedly attached to the closed of lower section and fallen Funnelform drainage collection device 600.By using the flexible pipe connection for ensureing abundant length, it can rock only suction filtration case, without The drainage collection device 600 that the quality for filling drainage of lower section must be made larger is rocked together, therefore can be reduced and be rocked power source (for example Crank shaft device) load.

Herein it should be noted that the necessary constitutive requirements of the drainage collection device and non-invention.

(course of work of aquatile harvester)

Illustrate the overall work process of the aquatile harvester of the embodiment of the present invention below.

Adopt suction suction force of the device 100 based on suction pump 500 and suction is containing needing to be adopted object (such as life of swimming from water Thing, zoobenthos, sand grain etc.) water, the water is directed to the superiors' screen of classified filtering device 200 by conduit 103 201 initiating terminal, and filtered because of the inclination of screen while being flowed to screen tail end, the sieve aperture of screen 201 is larger, therefore warp The filtering of sieves 201, larger filtrate slides with the angle of inclination of screen to be collected into basket type collector 400a.Through Cross the water after the superiors' screen 201 is filtered and flow to second layer screen 202, by the filtering of the screen 202, with the screen 202 The sample of time large scale (particle diameter) is collected into corresponding funnel type collector 400b.Similarly, by the mistake of second layer screen 202 Water after filter continues towards third layer screen 203, by the filtering of the screen 203, is received with the corresponding funnel type of screen 203 The sample of reduced size (particle diameter) is collected into storage 400b.Finally, the drainage after the filtering of third layer screen 203 is have passed through to enter Enter drainage collection device 600, subsequent treatment (for example directly drain, or be used as quantitative foundation) is carried out as needed.Pass through Above procedure, completes the basic aquatile collecting work of the embodiment of the present invention.

At this it should be noted that said respectively by each part of aquatile harvester in this specification It is bright, and in the explanation of each part, illustrate its variation or improve feature, these variations and improve feature can be with Various combinations are carried out, the technical scheme after combination is by the Overlay with these features.

It is described above, only it is the preferred embodiments of the present invention, any formal limitation not is made to the present invention, though So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification For the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, the technical spirit according to the present invention Any simple modification, equivalent variations and the modification made to above example, throw away and belong in the range of technical solution of the present invention.

Claims (7)

1. a kind of quantitative frame of zoobenthos collection, it is characterised in that including：

The certain framework of enclosed area,

The recovery rope of the framework is connected to, and

It is connected to the framework, for making the framework be temporarily fixed to gather the water-bed fixing component of environment；

The framework is right-angled U, chute is had on two sides of the U-frame, the chute is described in the U-frame The open end of side is opened, for making the suction nozzle of adopting with limit component stretch into and slide.

2. the quantitative frame of zoobenthos collection as claimed in claim 1, it is characterised in that

The fixing component is anchor.

3. the quantitative frame of zoobenthos collection as claimed in claim 1, it is characterised in that

The fixing component is pouring weight.

4. the quantitative frame of zoobenthos collection as claimed in claim 1, it is characterised in that

The fixing component is the fixation of the open end for two bottom comers and two side for being located at the U-frame frame respectively Nail.

5. the quantitative frame of zoobenthos collection as claimed in claim 4, it is characterised in that

The fixation is equipped with two bottom comers of the U-frame frame and the upper and lower surface side of the open end of two side Nail.

6. the quantitative frame of zoobenthos collection as claimed in claim 1, it is characterised in that

Buoy is connected with least diagonal position of the U-frame frame.

7. the quantitative frame of zoobenthos collection as claimed in claim 6, it is characterised in that

Buoy is respectively connected with two bottom comers of the framework and the open end of two side.