ES2685450A1 - Nursery for living aquatic organisms (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Nursery for living aquatic organisms. The present invention relates to a nursery for living aquatic organisms comprising a plurality of storage trays, these comprising a bottom and a peripheral wall surrounding the bottom and delimiting an opening opposite the bottom and surface S, a means of feeding of the buckets with filtered and cooled water as well as an opening for the evacuation of the water attached to a collection means, at least one of the buckets (30) comprising an anti-franking device (305) to prevent the passage of organisms through of the opening, the device comprising a grid (3051) located at least partially on the evacuation opening (304) and extending over a part of the surface S, and a wall (3050) inclined with respect to the horizontal and joined to the grid to block any passage of aquatic organisms above it. (Machine-translation by Google Translate, not legally binding)

Description

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DESCRIPTION

Nursery for living aquatic organisms.

Field of the Invention

The present invention relates to a nursery for living aquatic organisms.

The invention finds a particularly important, but not exclusive, application for seaworms, particularly American worms that are used as live bait for recreational fishing in the sea.

These organisms are generally supplied at points of sale in large cardboard boxes that allow the transport of more than a hundred live worms per box.

These worms are subsequently reconditioned at the points of sale, when the purchase takes place by a consumer.

State of the art

In order to facilitate the work of sellers, long-term conditioning and conservation systems have been proposed for seaworms, which include a stack of retention trays and recycled water feeding means above the battery. In this regard, documents FR 2 847 767 and FR 2 963 871 can be mentioned in particular.

Each of these trays constitutes a sales package, in which the worms are conditioned in small quantities.

These conditioning systems provide complete satisfaction since they allow worms to be preserved for several months while avoiding any manipulation in the sale, which allows sellers to save time.

However, it happens that only the stack of trays is used, in the absence of water supply above the stack. In fact, the stack of trays can simply be placed in a refrigerated display case, which does not allow worms to be stored for a long time.

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On the other hand, potential buyers know that these worms for fishing are fragile organisms that are unable to live a long time outside their natural environment. However, these preparations do not allow buyers to easily control the health status of worms.

In addition, buyers often wish to have worms of different species and these trays are no longer suitable.

At some points of sale, worms are stored in a nursery, which should allow buyers to visualize them well before proceeding with their purchase.

However, this is not the case in practice because the natural instinct of these worms is to hide. For example, they can slide behind the stones, seaweed or even bury themselves in the marine substrate present at the bottom of the aquarium, place themselves in a hidden corner of the aquarium or even group together as a tight ball, thus making their ends invisible . In addition, in many cases, these worms are confused with the relief and color of the seabed and are less visible to the buyer as they remain attached to the ground and flee from the light.

Therefore, even presented in a nursery, it is not easy for a user to see these sea worms correctly, so that they can control their state of health.

In addition, it is often found that nursery operation is disturbed as worms are introduced into water inlets and outlets, obstructing them and preventing proper circulation of water in the nursery.

This therefore leads to a deterioration of the health status of worms.

Summary of the invention

The invention aims to alleviate these inconveniences by proposing a nursery for living aquatic organisms that guarantees their conservation for a long time, while allowing them to be presented in an attractive way for buyers and being adapted to the multiple varieties of organisms available in the market.

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Therefore, the invention particularly relates to a nursery for living aquatic organisms comprising a plurality of storage pails, said buckets comprising a bottom and a peripheral wall surrounding said bottom and delimiting an opening opposite said bottom and surface S , means for feeding said filtered and refrigerated water tanks as well as an opening for the evacuation of water, at least one of said cells comprising an anti-postage device for organisms comprising a grid located at least partly above the evacuation opening and extending over at least a part of said surface S, as well as a wall inclined with respect to the horizontal and connected to the grid so as to block any passage above it.

The presence of the anti-postage device allows to avoid the passage of aquatic organisms from the bucket to the evacuation means and therefore any risk of plugging and stopping the circulation of water in the bucket.

In advantageous embodiments, on the other hand and / or in addition to one and / or another of the following provisions:

- the evacuation opening is made in a cuvette wall, said anti-postage device comprising a substantially horizontal grid placed against said cuvette wall and a substantially vertical solid wall that extends at least partly above the grid ;

- the evacuation opening is made in a cuvette wall, said anti-postage device comprising a lattice tube from which an end wall communicates with the evacuation opening and from which the other end wall forms said inclined wall, a part of the tube located below the evacuation opening;

- the evacuation opening being located at the end of a substantially vertical tube, said anti-postage device comprising a grid surrounding said tube, a wall surrounding said grill and extending above said grid;

- the water supply means comprise a pipe that extends at least partially in the thickness of the peripheral wall of said bucket;

- the water supply means are arranged to inject the water according to a

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direction that forms an angle strictly less than 90 ° with respect to the side wall of said cuvette, to create a circular or semicircular stream of water in said cuvette when it is in operation;

- said cuvette comprises an articulated splint with respect to a transverse axis and which can adopt a first lowered position in which said surface S partly covers and a second elevated position;

- the cuvette comprises a transparent wall that closes at least partially its opening;

- the nursery comprises a tank located above the plurality of the storage pails, intended to be filled with water and to feed said gravity flow feeding means with water;

- the nursery comprises a water collecting means that comes from said evacuation means, a pipe for supplying water present in said collecting means to the feed tank thanks to pumping means as well as filtration and cooling means associated with said pipeline ;

- the filtering and cooling means are located downstream of the pumping means;

- the filtration means are of the mechanical and / or biological type;

- one of said cuvettes comprises water supply means that create a flow of water in the upper part of the bucket, so that a water circuit can be established in a stack of trays;

- the bottom of the cuvette comprises an evacuation opening covered by a removable sieve.

- the nursery comprises inflation means connected to the nursery air network;

- the nursery comprises means of dynamic presentation of living aquatic organisms, these means comprising a deposit at least in a manner

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substantially partial transparent, comprising a bottom and open at its opposite end to the bottom, the tank comprising at its bottom a plurality of holes intended for the passage of water and / or pressurized air.

The invention also relates to a method of long-term preservation and presentation of living aquatic organisms, in which certain organisms are freely disposed in buckets of a nursery according to the invention, these cuvettes being previously filled with water, while others organisms are preconditioned in bags made of a transparent or semi-transparent material, whose wall defines an open end provided with closure means, a plurality of holes being made in the wall of the bag and the dimensions of the holes chosen to let the water and gases but to retain the organisms inside the bags, these bags being partially filled with water, closed and then placed in at least a part of said buckets.

Advantageously, each bucket and / or each bag corresponds to a particular species of aquatic organisms.

Brief description of the drawings

The invention will be better understood from reading the following description of embodiments of a nursery according to the invention, given by way of non-limiting examples.

The description refers to the accompanying drawings, in which:

Figure 1 is a perspective view illustrating an example of a nursery according to an embodiment of the invention.

Figure 2 is a perspective view illustrating three buckets of the nursery illustrated in Figure 1 corresponding to an embodiment of an anti-postage device.

Figure 3 illustrates in more detail one of the cuvettes shown in Figure 2.

Figure 4 is a scheme of operation of the nursery according to the invention;

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Figure 5 is a partial sectional view of a bucket of a nursery according to the invention illustrating a first variant embodiment of the anti-postage device.

Figure 6 is a sectional view of a bucket of a nursery according to the invention illustrating a second variant embodiment of the anti-postage device.

Figure 7 is a partial sectional view of a nursery tray illustrated in Figure 1 corresponding to another embodiment.

Figure 8 is a perspective view of nursery pails according to the invention, illustrating a bag inflation device.

The elements common to the different figures will be designated by the same references.

Detailed description of embodiments of the invention

First of all, reference is made to Figure 1 which shows the general structure of a nursery according to an embodiment of the invention, the latter being intended to be implanted at a point of sale, for example on a large surface, near the counter of sales of tools, clothing and / or fishing equipment.

This nursery is organized for example around two counters 10 and 11 arranged substantially parallel and leaving between them a space in which sellers can move.

In general, the configuration of the counters can be chosen to facilitate and optimize the circulation of the vendors.

In the embodiment illustrated in Figure 1, these two counters are symmetrical with each other and their description will be made with reference to the counter 10.

This counter comprises a plurality of drawers, drawers 3 and 9 comprising storage pails for aquatic organisms, containing drawers 4 technical means and a drawer 5 associated with the feeding means of the buckets

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with filtered and refrigerated water. Each of these drawers will be described in more detail below.

Reference is first made to Figures 2 and 3 which describe in greater detail the drawers 3 that are intended to be filled with water to receive aquatic organisms. It is the reason why the cuvettes are provided with anti-postage devices to prevent organisms from obstructing the means of evacuation of water present in the cuvettes.

Figure 2 thus shows a series of three storage pails 30, 31 and 32 that are present in the upper part of a drawer 3.

These three cuvettes being identical, the description will be made with respect to cuvette 30.

This comprises a bottom 300 and a peripheral wall 301 surrounding the bottom, this wall delimiting an opening opposite the bottom, of surface S.

In the embodiment illustrated in the figures, the wall 301 is double-sided. This allows the water supply means to pass through the thickness of the wall 301, as shown in Figure 3.

These feeding means comprise a pipe 302 that is connected at one end to a conduit 33, common to several cuvettes.

At its other end 303, the pipe 302 flows into the interior of the bowl 30.

In the upper part of the wall 301, an opening 304 is provided to evacuate the water present in the cuvette 3 when it reaches the level of this opening, the cuvette being fed regularly, even permanently, with filtered and cooled water.

This overflow opening is provided herein in the part of the side wall facing the conduit 33.

In the tray 30, an anti-postage device 305 is also provided, which in this case comprises a transverse wall 3050 and a grid 3051. This device is designed

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to prevent the passage of organisms through the overflow opening 304, particularly the passage of worms.

The transverse wall 3050, substantially vertical (perpendicular to the bottom 300), extends over a part of the height of the bucket, with respect to the overflow opening and in this case partly over the latter.

This transverse wall 3050 delimits with wall 301 two distinct surfaces S1 and S2, (the sum of which corresponds to the surface S defined by the opening of the cuvette), the surface S1 being defined between the part of the wall 301 comprising the overflow opening 304 and the transverse wall 3050 and the surface S2 corresponding to the rest of the surface defined by the opening of the cuvette.

A grid 3051 is arranged substantially horizontally (parallel to the bottom 300) and fixed on the transverse wall 3050 and on the wall 301, at a level lower than the overflow opening 304, so as to close the surface S1. This grid is therefore also located at the top of the cuvette wall. It extends over a part of the surface S.

It is understood that the wall 3050 serves as a support for the grid while preventing the passage of worms above it (since it extends above the grid). Obviously, this wall should not extend to the bottom 300 of the bucket since if not, the passage of water would be completely blocked.

In any description, it is understood as "a lower level of the opening" or "under the opening", a lower level in the lower part of this opening.

The surface S1 preferably corresponds to at least 10% of the total surface of the cuvette 30.

The size of the holes of this grid 3051 is chosen so as to prevent the passage of the aquatic organisms present in the bucket 30, such as sea worms.

The size of the holes may for example be between 2 mm and 3 mm.

This horizontal grid is therefore an effective obstacle for sea worms,

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even with relatively wide meshes.

Indeed, these worms naturally follow the evacuation current and therefore meet the grid. To the extent that their heads move permanently under the rack, they cannot access a precise hole. On the other hand, full of water, worms have no support. Therefore, the grid becomes an unstoppable obstacle to the passage of worms while allowing the passage of water due to its widened Maya.

On the other hand, undesirable debris such as mucus secreted by worms, with very sticky properties, contained in the water of the bucket, pass through the grid in a smaller amount due to the high position of the latter in the bucket.

It should also be stressed that, due to the large size of the holes, the grid is only very narrowly opposed to the passage of debris that can then be evacuated through the overflow opening.

In addition, the transverse wall 3050 prevents worms from passing over the grid, which would drag them through the opening 304.

This very effective solution can be compared to the classic solution that consists in placing a net that extends transversely and over the entire height of the tray.

When the network is in this position, worms can easily pass through it, especially because they can lean on each other to have more strength. Therefore, it is necessary to have a network of relatively closed meshes (for example having holes of approximately 0.5 mm), to prevent the passage of worms.

This therefore results in a significant inconvenience.

First, worms tend to accumulate against the network and partially obstruct it.

In addition, unwanted wastes can no longer pass through the network and also tend to accumulate against it.

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In both cases, the passage of water is partially prevented, which can lead to overflows and requires continuous cleaning of the bucket and the net.

It can be seen that the situation would be identical with a net placed directly against the overflow opening.

Therefore, in operation, the bucket 30 is filled with water, the water level being then established in the lower part of the overflow opening 304, flush with the grid 3051.

Preferably, the end 303 of the pipe 302 is not perpendicular to the wall 301 and for example forms with it an angle of less than 45 °. This allows to create a substantially circular current inside the bucket 30, which will drag the aquatic organisms 6 previously placed in the bucket 30 filled with water.

This current particularly provides the illusion that organisms are in the sea and is particularly attractive to buyers.

On the other hand, the transverse wall 3050 as well as the grid 3051 prevent the worms from accessing the overflow opening 304. Therefore, any risk of obstruction of this opening and / or the leakage of the sea worms is eliminated, which ensures a good functioning of the water circuit and therefore a long-term conservation of the worms present in the bucket.

The invention is not, however, limited to the anti-postage device just described and other embodiments can be contemplated.

Therefore, the grid is not necessarily located horizontally. It could also be inclined with respect to the bottom 300, for example at 45 °. The combination of this grid and the transverse wall located in front of the overflow opening and partly under the latter is always impossible to cross through the worms.

Similarly, wall 3050 is not necessarily vertical. It is sufficient that it is inclined upwards with respect to the bottom 300 to prevent the passage of the worms.

On the other hand, the transverse wall 3050 and the grid 3051 may be integrated in a sieve

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removably arranged in cuvette 3. This solution makes it easier to clean the rack.

Finally, the grid could also cover the entire surface of the cuvette, the transverse wall being then constituted by the cuvette's own wall or, conversely, only covering a part of the surface S1 located around the evacuation opening 304.

Figures 5 and 6 illustrate two other embodiments of this anti-postage device.

Figure 5 shows the bottom 300 and the wall 301 of the cuvette 3, as well as the overflow opening 304, located at the top of the cuvette wall. The latter flows into an evacuation duct 34.

The anti-postage device 306 in this case comprises a tube closed at its two ends 3061, 3062, all the walls of the tube being made of a grid of the type of the grid 3051.

The section of the tube 306 is greater than that of the opening 304.

Figure 5 shows that the end wall 3062 located in front of the opening 304 is attached to the evacuation conduit 34. However, it could also be envisaged to apply the end wall 3062 against the wall 301, so that it completely covers the opening 304. This tube is therefore also located at the top of the cuvette.

The tube 306 is located substantially horizontally (parallel to the bottom 300).

With the water level carrying the reference 308, Figure 5 shows that the tube 306 is located in front of the overflow opening 304, a part of the tube being located under this opening such that it is submerged and thus extends over a part of the surface S of the cuvette opening.

The end wall 3061 of the tube prevents worms from penetrating inside the tube. This wall can also be solid.

Figure 6 shows another variant in which the evacuation opening 304 is not located in

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the wall 301 of the cuvette 3 but inside the bucket itself 3. The evacuation means then consist of a tube 3040 open at its two ends, which extends substantially vertically, of which a lower end is connected to the conduit of discharge 34 and from which the other (upper) end 304 allows the passage of the water present in the bucket into the conduit 34 and thus constitutes the evacuation opening. This upper end is located at the top of the bucket.

The anti-postage device 309 in this case comprises a grid 3090 and a wall 3091.

This wall can for example be annular. Its section is superior to that of tube 3040 and the wall is arranged so that it surrounds it at the level of the upper end 304.

Figure 6 shows that the grid 3090 extends substantially horizontally over a part of the surface S of the cuvette opening and is fixed to the wall 3091 so that it is located under the opening 304. It remains however located in the top of the bucket.

In this case, in addition, the grid 3090 is of the type of the grid 3051 and prevents the passage of the worms into the space defined by the annular wall 3091. On the other hand, the wall 3091 prevents the worms from passing over the grid to reach evacuation opening 304.

Therefore, in all cases, the grid is located near the high level of the water in the bucket when it is filled with water and, preferably, slightly below the high level of the water in order to make it flush with it.

It is understood that the anti-postage devices just described are also effective in preventing the passage of organisms other than earthworms, such as crustaceans, molluscs or live baits.

Reference is now made to Figure 7 which illustrates in greater detail one of the buckets 90 of a drawer 9 comprising three of them, referenced 90, 91 and 92. The three drawers are identical.

Figure 7 shows that the cuvette 90 comprises a bottom 900 and a peripheral wall 910 that surrounds it and delimits an opening opposite the bottom.

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At the bottom of the cuvette, a long-term conditioning and preservation system of the type described in FR 2 847 767 is provided.

This system 901 comprises a stack of trays 903 to 909, each comprising a container intended to contain one or more aquatic organisms and a lid that covers at least partially the upper surface of the container.

A thin substrate such as sand, vermiculite or any other bed can be provided at the bottom of the trays.

On the other hand, each container has a water inlet 9030 to 9090 and a water outlet 9031 to 9091, whereby a water circuit is established that crosses the container, the inlet being 9030 to 9090 located at a height higher than the from exit 9031 to 9091.

As shown in Figure 7, the inlet is arranged in the tray cover and the outlet in the wall of the container.

On the other hand, the containers are arranged head-to-head so that the positioning of the entrance and the exit is reversed, alternatively in the stack, without this being imperative.

In the cuvette 90 a water supply is also provided in the upper part of the cuvette consisting of a series of tubes arranged along the wall 910, such as the tube 902 which extends substantially vertically and of which one end (lower) is connected to the feed conduit 33, its other end 9020 (upper) being open. It is through this that a water flow escapes whose flow can be controlled by appropriate means (not shown).

Therefore, the system 901 is arranged under the upper end 9020 of at least one tube, such that the water flow reaches the tray 903 located at the top of the stack.

The series of tubes could also be provided inside the double wall 910.

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Thanks to the water flow, a water circuit is established within each tray, all the water circuits being connected between them.

The water that comes out of the water outlet 9091 of the tray 909 reaches the bottom 900 of the bowl.

Figure 7 shows that the bottom 900 comprises a recess 9000 that flows, through an opening 9001, into a space 9002 located on the bottom 900 and that is connected to the means for evacuating the water (not shown).

Advantageously, in the recess 9000, a removable sieve 9003 is disposed that allows filtering the debris present in the water and which can be easily cleaned.

As illustrated in Figure 3, certain worms 6 can be pre-conditioned in bags 7 made of a transparent or semi-transparent material, and whose wall comprises a plurality of holes whose dimensions are chosen to allow water and air to pass but to retain the worms inside the bag.

These bags 7 are previously partially filled with water, worms are arranged inside, the bag is then closed and submerged in the bucket 30 filled with water.

A material that forms a ballast and / or a material that forms a bed for seaworms can also be deposited in certain bags.

Thanks to the air contained in the bags 7, they can float in the bucket 30, producing exchanges between the bags and the water in the bucket 3 which allows the organisms to be kept in a good state of health. This can be easily verified by potential buyers when a water bag is taken out.

On the other hand, this pre-conditioning allows considerably reducing the waiting time of buyers.

It may be desired in certain cases to constitute an air bag in the bag for a specific contribution.

Thus, Figure 8 illustrates inflation means 2 comprising a tube 20 in the form

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U inverted which is mounted between two cuvettes 30 and 31 (represented in this case schematically without anti-postage device). This tube is connected at one end to the duct 55 of the main air network, by means of a duct 21 that passes to the double wall 301 of the cuvette 30 and is open at the other end 22 of the U.

This duct 55 is connected to an air pump 56 and is part of an air network used to oxygenate the water of the filtration system.

A tap 23 is provided in the conduit 22 to allow the user to control the arrival of air at the open end of the tube.

As shown in Figure 8, the open end 22 of the tube 20 is located near the water level 308 in the bucket 30, which allows air to be introduced into the bag 7 while the bag (and thus a part of the holes) is in the water. This makes inflation effective by reducing air leaks through the holes.

On the other hand, the tube 20 is preferably pivotally mounted, which allows it to be used for two adjacent cuvettes 30 and 31.

Figures 2 and 3 also show that each cuvette 30 to 32 comprises a splint 307 to 327 that is mounted in rotation with respect to a transverse axis. In the illustrated embodiment, the board 307 is mounted on the transverse wall 3050.

It is therefore mobile in a first lowered position in which it covers the grid 3051 (it is the case for the cuvettes 31 and 32 illustrated in Figure 2) and therefore partially the surface S and a second raised position, in which it leaves the visible grid 3051 (this is the case for the tray 30 illustrated in Figure 2).

Therefore, in its first position, the splint allows sellers to have a work space, particularly to condition the worms according to customer orders or to put the pre-conditioning bags 7.

It can also serve as armrests.

In the second position of the splint, it is possible to have access in particular to the water supply conduit 33 of the cuvettes.

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The tray 30 may be completed by a transparent wall that partially closes the surface S2. This transparent wall allows to protect the aquatic organisms, allowing at the same time that the buyers see them evolve in the storage pails.

Reference is now made to Figures 1 and 4 to explain the general operation of the nursery according to the invention.

The nursery comprises a tank "high water tank" 50 filled with water and which is for example placed in the upper part of the drawer 5. It is natural or reconstituted seawater.

Therefore, this tank 50 is located above the nursery cuvettes, for example the nursery trays 30, 31 and 32, relative to the ground.

The lower part of this tank 50 is connected to various pipes 33 that feed the storage tanks.

Therefore, the different pipes 302, 312, 322 that provide water to each bucket 30, 31, 32 receive water from tank 50 by gravity flow.

The overflow of the tank 50 (arrow 54) as well as the overflows 304, 314, 324 of the different storage tanks are poured into collection means 330 located in the lower part of the drawers 5 and 3.

The water present in the collection bowl 330 is pumped by means of the pump 53 to pass to mechanical and biological filtration means 51, particularly located in the drawer 5.

Pump 53 may also be located in drawer 5.

Figure 4 schematically illustrates the main air network comprising the duct 55 and the pump 56 illustrated in Figure 8 as well as a duct 57 attached to the pump 56 and to the filtration means 51, so as to supply air to the same.

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After passing through the means 51, the water is conducted through a tank 52 comprising oyster shells, which may be located in the lower part of the drawer 3. This tank particularly allows the pH of the water to be stabilized.

At the exit of the tank 52, the water passes through a cooling system 40, for example also located in the drawer 5, before returning to the tank 50.

Thus, the general structure of the nursery according to the invention allows both to present and conserve aquatic organisms for a long time, to house different technical means necessary for the operation of the nursery and to offer available surfaces for information presentations on the panels of the different drawers visible by buyers, particularly through a multimedia device (for example flat screens).

To make the presentation of the products even more attractive, a dynamic presentation device 8 of living organisms can be arranged on a drawer 4.

Such a device comprises a reservoir 80 with a bottom 81 and, at its opposite end, an opening closed by a lid 82.

The tank comprises at its bottom a plurality of holes intended for the passage of water and / or pressurized air.

This device 8 is designed to generate currents inside the tank 80, which makes it possible to move the worms and make them perfectly visible to an outside observer located near the device, whatever its viewing angle.

Particularly advantageously, the device also comprises a tube placed inside the tank and open at its two ends, and at least substantially transparent in part, the lower end of this tube being positioned at a distance from the bottom of the tank and in the vertical of the holes, while its upper opening is at least partly located closer to the bottom of the tank than the upper end of the tank.

Thanks to this arrangement, it is possible, once the tank is full of water, to create ascending and descending currents inside the tank and thus controlling

totally positioning and displacement of worms in the device.

It is thus possible to obtain a movement of the worms from the bottom up or from the top down, of which the speed can be regulated and that it will give the impression that the earthworms dance a strange dance.

The device also creates special effects that contribute to the valorization of the aquatic organisms it contains, giving them the impression of dancing in the eyes of the observers, possibly accompanying them with appropriate music.

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As is evident and as it turns out from the foregoing, the present invention is not limited to the embodiments described more particularly. On the contrary it covers all its variants and in particular those in which the different drawers that house the nursery's constituent means are arranged differently.

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Claims (14)

5 10 fifteen twenty 25 30 35 1. Nursery for living aquatic organisms characterized in that it comprises a plurality of storage pails (30 to 32; 90 to 92), said buckets comprising a bottom (300, 310, 320; 900) and a peripheral wall (301, 311, 321; 901) surrounding said bottom and delimiting an opening opposite said bottom and surface S, feeding means (33) of said cuvettes with filtered and cooled water, as well as an opening (304, 314, 324, 9001 ) for the evacuation of water attached to a collection means, at least one of said cuvettes (30 to 32) comprising an anti-postage device (305, 306, 309) to prevent the passage of organisms through said opening, said device comprising a grid (3051, 306, 3090) located at least partly under the evacuation opening (304), and extending over a part of said surface S, as well as a wall (301, 3050, 3061, 3091) inclined with respect to the horizontal and attached to the grid so that b Loquea any step of aquatic organisms over it. 2. Nursery according to claim 1, characterized in that the evacuation opening (304) is made in a wall (301) of the bucket, said anti-lock device (305) comprising a substantially horizontal grid (3051) placed against said wall of the bucket and a solid wall (301, 3050) substantially vertical that extends at least partly above the grid. 3. Nursery according to claim 1, characterized in that the evacuation opening (304) is made in a cuvette wall, said anti-postage device comprising a lattice tube (306) of which an end wall (3062) communicates with the evacuation opening (304) and of which the other end wall (3061) forms said inclined wall, a part of the tube being located under the evacuation opening. 4. Nursery according to claim 1, characterized in that the evacuation opening (304) is located at the end of a substantially vertical tube (3040), wherein said anti-postage device (309) comprises a grid (3090) which said tube (3040) surrounds, surrounding a wall (3091) said grid and extending above said grid. 5. Nursery according to one of claims 1 to 4, characterized in that the water supply means comprise a pipe (302; 902) that extends at least partially in the thickness of the peripheral wall (301; 910) of said bucket. 5 10 fifteen twenty 25 30 35 6. Nursery according to one of claims 1 to 5, characterized in that the water supply means are arranged to inject water according to a direction that forms an angle strictly less than 90 ° with respect to the side wall of said bucket, to create a circular or semicircular stream of water in said at least one cuvette when it is in operation. 7. Nursery according to one of claims 1 to 6, characterized in that said at least one tray (30, 31, 32) comprises a splint (307, 317, 327) articulated with respect to a transverse axis and which can adopt a first lowered position in which said surface S partially covers and a second raised position. 8. Nursery according to one of claims 1 to 7, characterized in that at least one of said cuvettes comprises a transparent wall that closes at least partially its opening. 9. Nursery according to one of claims 1 to 8, characterized in that it comprises a tank (50) located above the plurality of the storage pails, intended to be filled with water and to provide water to said flow feeding means by gravity. A nursery according to one of claims 1 to 9, comprising a stack of trays intended to contain one or more aquatic organisms, characterized in that at least one of said buckets (90 to 92) comprises water feeding means ( 902) that create a flow of water in the upper part of the bucket, so that a water circuit can be established in said stack of trays (903 to 909). 11. Nursery according to claim 10, characterized in that the bottom (900) of at least one of said cuvettes comprises an evacuation opening (9001) covered by a removable sieve (9003). 12. Nursery according to one of claims 1 to 9, comprising an air network, characterized in that inflation means (2) are provided connected to said nursery air network. 13. Nursery according to one of claims 1 to 12, characterized in that it comprises means (8) for dynamic presentation of living aquatic organisms, these comprising means a reservoir (80) at least partly substantially transparent comprising a bottom and open at its opposite end to the bottom, said reservoir comprising at its bottom a plurality of holes intended for the passage of water and / or pressurized air. 5 14. Method of long-term preservation and presentation of living aquatic organisms, characterized in that certain organisms are freely disposed in buckets (30, 31, 32) of a nursery according to one of claims 1 to 13, these buckets being previously filled with water, while other organisms are preconditioned in bags (7) made of a transparent or semi-transparent material, whose wall defines an open end provided with closing means, a plurality of holes being made in the wall of the bag and the dimensions of the holes chosen to allow water and gases to pass through but to retain the organisms inside the bags, these bags being partially filled with water, closed and then placed in at least a part of said bags. cuvettes, each bucket corresponding, preferably, to a particular species of aquatic organisms.