WO1989008389A1 - Tray for growing molluscs - Google Patents
Tray for growing molluscs Download PDFInfo
- Publication number
- WO1989008389A1 WO1989008389A1 PCT/AU1989/000099 AU8900099W WO8908389A1 WO 1989008389 A1 WO1989008389 A1 WO 1989008389A1 AU 8900099 W AU8900099 W AU 8900099W WO 8908389 A1 WO8908389 A1 WO 8908389A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tray
- trays
- floor
- mesh
- walls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
-
- 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
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Definitions
- the present invention relates to a tray for cultivating molluscs.
- the invention has particular application in the cultivation of oysters but is also suitable for mussels and scallops and the like.
- the following description refers to oysters only.
- oysters are cultivated from juvenile stage to maturity within the inter-tidal zone, the oysters being grown in oyster trays situated between low and high tide.
- Conventional trays are typically 6 to 9 feet in length and 3 feet in width.
- Various materials are used in the construction although timber has been generally preferred.
- Oysters are generally distributed over the floor of the oyster trays in spaced relationship from one another. In order to allow water circulation the oyster trays generally have a mesh floor.
- the sides of each tray are generally wooden and require treatment to prevent rapid deterioration as a result of immersion in sea water.
- the trays are generally supported on rails or racks so that the trays are situated in the inter tidal zone. Hitherto, the wooden sides of the trays have limited to some extent the lateral forces exerted on the oysters by virtue of tidal movement although under certain weather conditions the oysters have been found to be washed towards various areas of each tray. This results in the need to re-distribute the oysters over the floor of each tray by raking them.
- trays are used in single layers, leading to a fairly inefficient use of the oyster lease area.
- the trays are generally covered with a heshan type fabric or shade cloth to protect the growing oysters from predators such as fish.
- a tray for cultivating molluscs comprising a floor section and upstanding walls surrounding said floor section, the floor section and walls each having areas of mesh-like structure incorporated therein to facilitate circulation of water therethrough.
- the tray is constructed of plastic which is formed in an injection mold as an intregal structure. Being of plastic the tray does not require the treatment necessary to preserve it that wooden trays require. Another advantage of the embodiment having an integral structure is that the tray does not require assembly and is maintenance free, lasting several seasons compared to conventional wooden trays.
- the walls of the trays incorporate lugs to allow the trays to be clipped together on top of each other.
- Conventional trays cannot be usefully stacked on each other since the circulation through one tray to the next would be insufficient. This is so because conventional trays rely on water passing through the mesh in the bottom thereof, which mesh is covered by oysters thereby restricting the flow.
- the advantage of the present trays lies in the lateral circulation provided by the mesh sections of the side walls. Furthermore, stacking of the trays reduces the risk of oysters floating off trays or being attacked by predators.
- an individual tray or a group of trays stacked on top of one another is provided with a lid suitable for attachment to the one or top tray.
- the lid may be solid or of mesh. Unlike conventional trays in which the solid lid would significantly reduce the free circulation of water therethrough, the mesh sides of the tray provide adequate circulation even if the lid were solid.
- the tray is preferably designed with a grid-like structure in the floor section so that the shellfish do not bunch up when jostled in rough water.
- this grid is 100 mm square, having a height of 5 mm.
- the floor of the tray is preferably provided with 8 mm mesh.
- strengthening ribs may also be provided in the floor section. For example these could be preferably 40 mm high and conveniently divide the tray area into six portions. These ribs also help to avoid bunching up of the oysters.
- each tray is provided with a ring arrangement at each end which may be placed over a pipe secured into the floor of the lake or river etc.
- each tray or group of trays may be provided with buoyancy, and in conjunction with the ring arrangement, the tray or trays can float up and down with the tide, at any predetermined level relative to the water level.
- heat kill occurs when oysters are left out of the water for too long in the hot sun.
- Figure 1 is a perspective view of a tray according to the present invention
- SUBSTITUTE SHEET Figure 2 is a detail of the mesh areas of the floor and walls of the tray of Figure 1,
- FIG 3 is a detail of the clip system for the tray of Figure 1
- Figure 4 is a securing clip for attachment of the tray of Figure 1 to a float
- Figure 5 is a locking clip with which to secure each tray of Figure 1 to the next,
- Figure 6 is a plan view of the tray
- Figure 7 is a lid for the tray
- Figure 8 is a schematic diagram in side elevation of a pair of trays of Figure 1 attached together showing the way in which a third tray fits thereon, the trays being suspended from a flotation device.
- FIG. 1 shows in perspective
- Figure 6 shows in plan, an oyster tray which is a preferred embodiment of the invention.
- the oyster tray 10 is an injection molded tray of integral structure having a floor 11 and side walls 12.
- the floor 11 comprises a mesh structure 13, the mesh being 8 mm square in dimension.
- Superimposed on this mesh structure 13 is a grid-like structure 14, the grid-like structure being 100 mm square in area and having a height of 5 mm.
- Reinforcing ribs 15, 16 and 17 are provided on the floor 11 of the tray 10. Reinforcing ribs 15, 16 and 17 divide the total floor area 11 into six smaller areas.
- Side walls 12 have areas 18 which also consist of an 8 mm mesh portion similar to the mesh portion 13 of floor 10.
- the walls 12 are also provided with lugs 19 into which connecting elements 20 may be fitted. Pairs of lugs 19 are provided to allow stacking of several trays 10 by using alternate members of the pair as each row of trays is added. This is more clearly illustrated in Figure 8.
- FIG. 3 an alternate connector 21 is provided having a hole 22 in the upper portion to receive a nylon cord or the like for securing the tray to a flotation device such as shown in Figure 8.
- the connecting clips are shown in more detail in Figures 4 and 5 where Figure 5 shows the clip 20 having a pair of legs 24 and 25 at each end thereof which may be squeezed to pass through lug 19 and upon release legs 24 and 25 separate to engage in lug 19, being restrained from removal therefrom by virtue of lip 26. A thickened centre portion 27 of the connecting clip 20 stops the clip 20 passing right through lug 19.
- Figure 4 shows a clip 21 for connecting the tray to a flotation device using a nylon cord, the clip 21 having its bottom half 28 identical to one half of clip 20.
- the top half 29 consists of a flap portion having a central hole 22 therein.
- Clips 21 may be secured to flotation device 23 by means of nylon cord 29 tied through hole 22 and around flotation device 23, as illustrated in Figure 8.
- Tray 10 is also provided with rings 30 integrally formed in the end of the trays having holes 31 therein. These rings may be positioned on the poles 32 as illustrated in Figure 8.
- a lid 33 for the tray, or group of trays is shown in Figure 7.
- the lid can be conveniently tied to the upper most lugs 19 of the top tray 10 by means of connectors 34 or 35.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
A tray for cultivating molluscs, which is an injection molded tray of integral structure having a floor (11) and side-walls (12). The floor (11) comprises a mesh structure (13) onto which may be superimposed a grid-like structure (14), and reinforcing ribs (15, 16 and 17). Side-walls (12) have mesh-like areas (18) similar to the mesh portions (13) of floor (11). The walls (12) may also be provided with lugs (19) into which connecting elements (20) may be fitted to allow stacking of several trays to increase the number of trays per unit area of the oyster lease.
Description
TRAY FOR GROWING MOLLUSCS
TECHNICAL FIELD
The present invention relates to a tray for cultivating molluscs. The invention has particular application in the cultivation of oysters but is also suitable for mussels and scallops and the like. For convenience of reference the following description refers to oysters only.
BACKGROUND ART
Conventionally oysters are cultivated from juvenile stage to maturity within the inter-tidal zone, the oysters being grown in oyster trays situated between low and high tide. Conventional trays are typically 6 to 9 feet in length and 3 feet in width. Various materials are used in the construction although timber has been generally preferred. Oysters are generally distributed over the floor of the oyster trays in spaced relationship from one another. In order to allow water circulation the oyster trays generally have a mesh floor. The sides of each tray are generally wooden and require treatment to prevent rapid deterioration as a result of immersion in sea water.
The trays are generally supported on rails or racks so that the trays are situated in the inter tidal zone. Hitherto, the wooden sides of the trays have limited to some extent the lateral forces exerted on the oysters by virtue of tidal movement although under certain weather conditions the oysters have been found to be washed towards various areas of each tray. This results in the need to re-distribute the oysters over the floor of each tray by raking them.
One particular disadvantage of presently known trays is the lack of circulation of water through the trays since the oysters effectively cover much of the bottom mesh of each tray. This also means that trays cannot be stacked on each other. Conventionally therefore, trays are used in single
layers, leading to a fairly inefficient use of the oyster lease area. The trays are generally covered with a heshan type fabric or shade cloth to protect the growing oysters from predators such as fish.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide an improved tray in which some or all of the above disadvantages are ameliorated. According to the present invention there is provided a tray for cultivating molluscs comprising a floor section and upstanding walls surrounding said floor section, the floor section and walls each having areas of mesh-like structure incorporated therein to facilitate circulation of water therethrough.
Preferably the tray is constructed of plastic which is formed in an injection mold as an intregal structure. Being of plastic the tray does not require the treatment necessary to preserve it that wooden trays require. Another advantage of the embodiment having an integral structure is that the tray does not require assembly and is maintenance free, lasting several seasons compared to conventional wooden trays.
Preferably the walls of the trays incorporate lugs to allow the trays to be clipped together on top of each other. This allows for the trays to be stacked on top of each other to increase the number of trays per unit area of lease. Conventional trays cannot be usefully stacked on each other since the circulation through one tray to the next would be insufficient. This is so because conventional trays rely on water passing through the mesh in the bottom thereof, which mesh is covered by oysters thereby restricting the flow. The advantage of the present trays lies in the lateral circulation provided by the mesh sections of the side walls. Furthermore, stacking of the trays reduces the risk of oysters floating off trays or being attacked by predators.
Preferably an individual tray or a group of trays stacked on top of one another is provided with a lid suitable for attachment to the one or top tray. The lid may be solid or of mesh. Unlike conventional trays in which the solid lid would significantly reduce the free circulation of water therethrough, the mesh sides of the tray provide adequate circulation even if the lid were solid.
The tray is preferably designed with a grid-like structure in the floor section so that the shellfish do not bunch up when jostled in rough water. Preferably this grid is 100 mm square, having a height of 5 mm. The floor of the tray is preferably provided with 8 mm mesh. In addition strengthening ribs may also be provided in the floor section. For example these could be preferably 40 mm high and conveniently divide the tray area into six portions. These ribs also help to avoid bunching up of the oysters.
Preferably each tray is provided with a ring arrangement at each end which may be placed over a pipe secured into the floor of the lake or river etc. By means of a suitable flotation system each tray or group of trays may be provided with buoyancy, and in conjunction with the ring arrangement, the tray or trays can float up and down with the tide, at any predetermined level relative to the water level. By correct location of the tray (i.e. suspended under water by means of the flotation system), heat kill can be drastically eliminated. Heat kill occurs when oysters are left out of the water for too long in the hot sun.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to better understand the invention reference is made to the accompanying drawings which are an illustration of the preferred embodiment. It is to be understood that the invention is not limited to the specific forms as shown in the drawings of which:
Figure 1 is a perspective view of a tray according to the present invention,
SUBSTITUTE SHEET
Figure 2 is a detail of the mesh areas of the floor and walls of the tray of Figure 1,
Figure 3 is a detail of the clip system for the tray of Figure 1,
Figure 4 is a securing clip for attachment of the tray of Figure 1 to a float,
Figure 5 is a locking clip with which to secure each tray of Figure 1 to the next,
Figure 6 is a plan view of the tray,
Figure 7 is a lid for the tray, and
Figure 8 is a schematic diagram in side elevation of a pair of trays of Figure 1 attached together showing the way in which a third tray fits thereon, the trays being suspended from a flotation device.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring specifically to the Figures, Figure 1 shows in perspective, and Figure 6 shows in plan, an oyster tray which is a preferred embodiment of the invention. The oyster tray 10 is an injection molded tray of integral structure having a floor 11 and side walls 12. The floor 11 comprises a mesh structure 13, the mesh being 8 mm square in dimension. Superimposed on this mesh structure 13 is a grid-like structure 14, the grid-like structure being 100 mm square in area and having a height of 5 mm. Reinforcing ribs 15, 16 and 17 are provided on the floor 11 of the tray 10. Reinforcing ribs 15, 16 and 17 divide the total floor area 11 into six smaller areas.
Side walls 12 have areas 18 which also consist of an 8 mm mesh portion similar to the mesh portion 13 of floor 10.
The walls 12 are also provided with lugs 19 into which connecting elements 20 may be fitted. Pairs of lugs 19 are provided to allow stacking of several trays 10 by using alternate members of the pair as each row of trays is added. This is more clearly illustrated in Figure 8.
SUBSTITUTE SHEET
As shown in Figure 3 an alternate connector 21 is provided having a hole 22 in the upper portion to receive a nylon cord or the like for securing the tray to a flotation device such as shown in Figure 8. The connecting clips are shown in more detail in Figures 4 and 5 where Figure 5 shows the clip 20 having a pair of legs 24 and 25 at each end thereof which may be squeezed to pass through lug 19 and upon release legs 24 and 25 separate to engage in lug 19, being restrained from removal therefrom by virtue of lip 26. A thickened centre portion 27 of the connecting clip 20 stops the clip 20 passing right through lug 19. Figure 4 shows a clip 21 for connecting the tray to a flotation device using a nylon cord, the clip 21 having its bottom half 28 identical to one half of clip 20. The top half 29 consists of a flap portion having a central hole 22 therein.
Clips 21 may be secured to flotation device 23 by means of nylon cord 29 tied through hole 22 and around flotation device 23, as illustrated in Figure 8. Tray 10 is also provided with rings 30 integrally formed in the end of the trays having holes 31 therein. These rings may be positioned on the poles 32 as illustrated in Figure 8.
A lid 33 for the tray, or group of trays is shown in Figure 7. The lid can be conveniently tied to the upper most lugs 19 of the top tray 10 by means of connectors 34 or 35.
j^STjruTTTr^
Claims
1. A tray for cultivating molluscs comprising a floor section and upstanding walls surrounding said floor section, the floor section and walls each having areas of mesh-like structure incorporated therein to facilitate circulation of water therethrough.
2. A tray according to claim 1 wherein the tray is constructed of plastic which is formed as an intregal structure.
3. A tray according to any one of the preceding claims wherein the walls of the trays incorporate lugs to allow the trays to be clipped together on top of each other to form a group of stacked trays.
4. A tray according to claim 3 wherein an individual tray or a group of trays stacked on top of one another is provided with a lid suitable for attachment to the one or top tray, the lid being solid or having mesh-like portions.
5. A tray according to any one of the preceding claims wherein the floor of the tray is provided with 8 mm mesh.
6. A tray according to any one of the preceding claims wherein the tray has a grid-like structure in the floor section so that the molluscs do not bunch up when jostled in rough water.
7. A tray according to claim 6 wherein the grid-like structure will be 100 mm square, having a height of 5 mm.
8. A tray according to any one of the preceding claims wherein strengthening ribs are also provided in the floor section, these ribs being preferably 40 mm high and dividing the tray area into six portions.
9. A tray according to any one of the preceding claims wherein each tray is provided with a ring arrangement at each end which may be placed over a pipe secured into the floor of the lake or river etc, so that by means of a suitable flotation system each tray or group of trays is provided with buoyancy, and in conjunction with the ring
SUBSTITUTE SHEET arrangement, the tray or trays can float up and down with the tide, at any predetermined level relative to the water level.
10. A tray for cultivating molluscs substantially as described herein in conjunction with the drawings.
I
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPI7196 | 1988-03-11 | ||
| AUPI719688 | 1988-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1989008389A1 true WO1989008389A1 (en) | 1989-09-21 |
Family
ID=3772907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AU1989/000099 Ceased WO1989008389A1 (en) | 1988-03-11 | 1989-03-13 | Tray for growing molluscs |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1989008389A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2242811A (en) * | 1990-04-10 | 1991-10-16 | James Alexander Fraser | Scallop growing tray |
| NL1008082C2 (en) * | 1998-01-21 | 1999-07-22 | Jacobus Johannes Boersen | Apparatus and method for breeding shellfish. |
| FR2974275A1 (en) * | 2011-04-21 | 2012-10-26 | Sylvain Huchette | Plate for shellfish i.e. abalone, breeding structure, has four flanges extending on four sides of square bottom, respectively, where bottom and flanges are made of mesh for flow of water through mesh |
| CN102919169A (en) * | 2012-10-19 | 2013-02-13 | 中国科学院海洋研究所 | Device and method for cultivating atrina pectinata parent shellfish |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR855799A (en) * | 1939-06-06 | 1940-05-20 | Box for breeding or storing oysters | |
| FR1209057A (en) * | 1957-07-16 | 1960-02-29 | Oyster basket | |
| FR1211067A (en) * | 1958-10-01 | 1960-03-14 | A Gallot & H Labadie Ets | Metal frame for oyster farming |
| US2989945A (en) * | 1959-07-27 | 1961-06-27 | Edwin H Ford | Seafood farming apparatus |
| FR1356207A (en) * | 1960-04-04 | 1964-03-27 | Improvements made to oyster racks used for the farming and culture of oysters and all other shellfish, crops and farming in a marine environment | |
| US3702599A (en) * | 1971-05-27 | 1972-11-14 | Vanguard Industries | Shellfish growout tray |
| US4186687A (en) * | 1978-07-18 | 1980-02-05 | Gilpatric Donald S | Method for growing oysters and other molluscs |
| US4231322A (en) * | 1979-07-02 | 1980-11-04 | Gilpatric Donald S | Apparatus for growing oysters and other molluscs |
| FR2466192A1 (en) * | 1979-09-28 | 1981-04-10 | Devin Francis | Structure for breeding shellfish - has openwork baskets containing young stacked in rows on platforms and held by braced side clamps |
| FR2590765A1 (en) * | 1985-12-02 | 1987-06-05 | Intermas Sa | Mesh container for breeding oysters and the like |
-
1989
- 1989-03-13 WO PCT/AU1989/000099 patent/WO1989008389A1/en not_active Ceased
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR855799A (en) * | 1939-06-06 | 1940-05-20 | Box for breeding or storing oysters | |
| FR1209057A (en) * | 1957-07-16 | 1960-02-29 | Oyster basket | |
| FR1211067A (en) * | 1958-10-01 | 1960-03-14 | A Gallot & H Labadie Ets | Metal frame for oyster farming |
| US2989945A (en) * | 1959-07-27 | 1961-06-27 | Edwin H Ford | Seafood farming apparatus |
| FR1356207A (en) * | 1960-04-04 | 1964-03-27 | Improvements made to oyster racks used for the farming and culture of oysters and all other shellfish, crops and farming in a marine environment | |
| US3702599A (en) * | 1971-05-27 | 1972-11-14 | Vanguard Industries | Shellfish growout tray |
| US4186687A (en) * | 1978-07-18 | 1980-02-05 | Gilpatric Donald S | Method for growing oysters and other molluscs |
| US4231322A (en) * | 1979-07-02 | 1980-11-04 | Gilpatric Donald S | Apparatus for growing oysters and other molluscs |
| FR2466192A1 (en) * | 1979-09-28 | 1981-04-10 | Devin Francis | Structure for breeding shellfish - has openwork baskets containing young stacked in rows on platforms and held by braced side clamps |
| FR2590765A1 (en) * | 1985-12-02 | 1987-06-05 | Intermas Sa | Mesh container for breeding oysters and the like |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2242811A (en) * | 1990-04-10 | 1991-10-16 | James Alexander Fraser | Scallop growing tray |
| GB2242811B (en) * | 1990-04-10 | 1993-11-24 | James Alexander Fraser | Scallop growing tray |
| NL1008082C2 (en) * | 1998-01-21 | 1999-07-22 | Jacobus Johannes Boersen | Apparatus and method for breeding shellfish. |
| WO1999037141A1 (en) * | 1998-01-21 | 1999-07-29 | Zuidema, Jan, Martien | Device and method for cultivating shellfish |
| FR2974275A1 (en) * | 2011-04-21 | 2012-10-26 | Sylvain Huchette | Plate for shellfish i.e. abalone, breeding structure, has four flanges extending on four sides of square bottom, respectively, where bottom and flanges are made of mesh for flow of water through mesh |
| CN102919169A (en) * | 2012-10-19 | 2013-02-13 | 中国科学院海洋研究所 | Device and method for cultivating atrina pectinata parent shellfish |
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