CN114051964A - Perch micropterus salmoides fry screening system and method - Google Patents
Perch micropterus salmoides fry screening system and method Download PDFInfo
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- CN114051964A CN114051964A CN202111348308.1A CN202111348308A CN114051964A CN 114051964 A CN114051964 A CN 114051964A CN 202111348308 A CN202111348308 A CN 202111348308A CN 114051964 A CN114051964 A CN 114051964A
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- 238000012216 screening Methods 0.000 title claims abstract description 62
- 241001125889 Micropterus salmoides Species 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 20
- 241000269799 Perca fluviatilis Species 0.000 title description 3
- 239000004568 cement Substances 0.000 claims abstract description 22
- 210000001503 joint Anatomy 0.000 claims description 33
- 241000251468 Actinopterygii Species 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000007796 conventional method Methods 0.000 claims description 4
- 230000004083 survival effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009395 breeding Methods 0.000 description 8
- 230000001488 breeding effect Effects 0.000 description 6
- 238000012258 culturing Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000037406 food intake Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000384 rearing effect Effects 0.000 description 2
- 241000291280 Micropterus floridanus Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012364 cultivation method Methods 0.000 description 1
- 238000012136 culture method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000001418 larval effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/90—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination
- A01K61/95—Sorting, grading, counting or marking live aquatic animals, e.g. sex determination specially adapted for fish
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
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- 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
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Abstract
The invention discloses a micropterus salmoides fry screening system and a micropterus salmoides fry screening method, and belongs to the technical field of micropterus salmoides fry cultivation. The cage frame is rotatably connected with the fixing frame, the cage is arranged on the cage frame, and the width and the depth of the cage are smaller than those of the cement pond. According to the invention, through the classified screening and cultivation of the net cages, the negative effects caused by the specification difference of fries are eliminated, the damage to the fries is reduced, and the survival rate is improved.
Description
Technical Field
The invention relates to the technical field of largemouth bass fry breeding, in particular to a largemouth bass fry screening system and a method.
Background
In the process of fry rearing of largemouth bass, because of uneven ingestion, the difference in specification is easily formed, and in the fry stage, the largemouth fry can swallow a small fry which is half of the length of the largemouth bass, which is also an important reason for the low rearing survival rate. At present, the largemouth bass fry breeding mainly adopts a traditional fry pond breeding method and an intensive breeding method. The former is through breeding zooplankton in the pond as the initial feed, along with the growth of fry, uses artifical compound feed gradually, because of the micropterus salmoides is carnivorous fish, can receive the influence of taming the food pressure and feeding nature when being compelled to select artifical compound feed, the fry growth desynchronization appears, difference acceleration increase trend between the individual. The phenomenon that the larval black bass fry is eaten a little is mainly generated at the stage of the body length of about 22 cm. Because the water surface of a general pond is large, fish fries are difficult to screen and are affected by uneven ingestion, the survival rate of the fry breeding in the pond is always low, the breeding pond occupies a large area of the pond, the labor intensity is high, fine management is not facilitated, and particularly, large-scale fry production is difficult to deal with. Under such circumstances, intensive seedling culture methods are gradually employed. Intensive cultivation of micropterus salmoides fry is generally carried out in a greenhouse cement pond and a cultivation barrel, and the problem of uneven growth still exists in the feeding process due to high cultivation density, so that the micropterus salmoides fry are regularly screened and classified for cultivation.
At present, screening largemouth bass fry is manually operated by using a traditional fish screen, pond drainage is needed before screening, the fry is caught by pulling a net, and classified cultivation is carried out after screening. In the process of breeding the largemouth bass fry, the largemouth bass fry needs to be screened once every week or so. The fry screening consumes a large amount of manpower and material resources, and the fry can be damaged, infected and infected with diseases in the operation process, so that the survival rate and the quality of the fry are seriously influenced.
Therefore, how to provide a system and a method for screening micropterus salmoides fries becomes a problem to be considered by the people in the field.
Disclosure of Invention
In view of the above, the invention provides a micropterus salmoides fry screening system and method, and the invention eliminates the negative effects caused by the difference of fry specifications through the graded screening and cultivation of the net cages, reduces the damage to fries and improves the survival rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a macrostoma perch seed screening system, includes cement pond, net cage frame, mount and a plurality of box with a net, the cement pond is used for setting up the box with a net and cultivates the fry, the mount clamps on the long ridge of cement pond both sides, the net cage frame is installed on the mount, the net cage frame rotates with the mount to be connected, the support frame of net cage frame sets up to two-layer for install the box with a net of different meshes, the width and the degree of depth of box with a net are less than the cement pond.
Further, the net cage frame comprises an outer support frame, an outer fixing rod, an inner support frame and a bolt, the outer support frame is arranged on the outer fixing rod, the inner support frame is arranged on the inner fixing rod, the inner fixing rod is welded on the outer fixing rod, threaded holes are formed in the center positions of the outer fixing rod and the inner fixing rod, the bolt is in threaded connection with the outer fixing rod and the inner fixing rod, the net cage upper net is tied at two ends of the outer fixing rod, the net cage of the outer net cage is fixed by the outer support frame, the net cage of the inner net cage is tied at two ends of the inner fixing rod, and the net cage of the inner net cage is fixed by the inner support frame.
Furthermore, the outer support frame is circular, oval or rectangular, and the inner support frame is circular, oval or rectangular.
Furthermore, the end side surface of the net cage of the outer layer is half of the shape of the outer support frame, and the end side surface of the net cage of the inner layer is half of the shape of the inner support frame.
Furthermore, the meshes of the net cage are evenly arranged by more than five grades according to the length of the fry ranging from 2cm to 12 cm.
Furthermore, the net cage is made of hard materials, and is woven by net wires with the diameter of more than 1 mm.
Furthermore, the small balls are arranged on the steel ropes of the net cage at certain intervals, and when the net cage is replaced, the cage opening of a new net cage is sleeved under the cage opening of an old net cage from top to bottom, and the steel ropes are tensioned, so that the new net cage and the old net cage are in seamless butt joint, and fish escape is prevented in the replacement process.
Further, the fixing frame comprises a clamping frame and a clamping column, the clamping column is installed on the clamping frame and provided with a height adjusting device, a clamping seam is arranged at the top end of the clamping column and provided with a clamping pit, and the head of the bolt is clamped in the clamping pit.
A screening method of micropterus salmoides fries is characterized by comprising the following steps:
s1, pre-screening and cultivating, namely installing a dense-mesh net cage on an inner support frame of a net cage frame, stocking 1.8-2.2 cm of fish fries, cultivating for five to seven days according to a conventional method, and then carrying out one-to five-stage screening and cultivating;
s2, grading, screening and cultivating:
a. primary screening and cultivation: a second-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the dense-mesh net cage; the outer supporting frame is sleeved with a first-level net cage. Leading the fry into a second-stage net cage, wherein the larger fry is left in the second-stage net cage due to density stress, the smaller fry enters a first-stage net cage, and the first-stage net cage and the second-stage net cage are cultivated for seven to ten days when the feed is fed;
b. secondary screening and cultivation: the inner support frame at the upper half part of the net cage frame is provided with a third-stage net cage which is in butt joint with the second-stage net cage; the outer support frame is sleeved with a second-level net cage which is in butt joint with the first-level net cage, the fry is guided into the butt-joint net cage, larger fry can stay in the guided third-level net cage due to the stress of density, smaller fry can swim into the second-level net cage, and the second-level net cage is firstly followed by the third-level net cage when the feed is fed. Cultivating for seven to ten days;
c. and (3) three-stage screening and cultivation: a fourth-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the third-stage net cage; the outer supporting frame is sleeved with a third-stage net cage which is in butt joint with the second-stage net cage. The fry is guided into the butted net cages, because of density stress, the larger fry can stay in the guided four-stage net cage, the smaller fry can swim out to enter the three-stage net cage, and the three-stage net cage and the four-stage net cage are arranged after the feed is fed. Cultivating for seven to ten days;
d. four-stage screening and cultivation: a fifth-level net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the fourth-level net cage; the outer support frame is sleeved with a four-stage net cage which is in butt joint with the three-stage net cage, the fries are guided into the butt-jointed net cage, large fries can stay in the guided five-stage net cage due to the stress of density, small fries can swim out to enter the four-stage net cage, and the fries are cultivated for seven to ten days after the four-stage net cage and the five-stage net cage when being fed with feed;
e. five-stage screening and cultivation: a six-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the five-stage net cage; the outer support frame is sleeved with a five-stage net cage which is in butt joint with the four-stage net cage, the fry is guided into the butt joint net cage, large fry can remain in the guided six-stage net cage due to the stress of density, and small fry can swim out;
f. cultivating for seven to ten days, then clearing the pond, combining the seedlings in the six-level and five-level net cages and the cement pond together, dividing the seedlings into three categories, and carrying out conventional reinforced cultivation, wherein the seedlings are cultivated for eighteen to twenty-two days, and the body length reaches 11.5cm-12.5 cm.
The invention has the beneficial effects that: in the seedling cultivation process, seedling screening is not needed, only the net cage needs to be simply replaced, and the operation is simple, so that the method is suitable for large-scale seedling cultivation. The cultured similar seedlings have uniform specification and the survival rate is obviously improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of the net cage frame of the invention.
Fig. 3 is a schematic structural view of the fixing frame of the present invention.
The net cage fixing device comprises a net cage frame 1, a cement pond 2, a fixing frame 3, an inner fixing rod 4, an outer supporting frame 5, an outer fixing rod 6, an inner supporting frame 7, a bolt 8, a clamping column 9, a clamping frame 10 and a clamping pit 11.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in figures 1-3, the invention discloses a largemouth black bass fry screening system which comprises a cement pond 2, net cage frames 1, a fixing frame 3 and a plurality of net cages, wherein the cement pond 2 is used for erecting the net cages and cultivating fries, the fixing frame 3 is clamped on a long ridge of the cement pond 2, the fixing frames 3 are arranged in pairs, the net cage frames 1 are arranged on the fixing frame, the net cage frames 1 are rotatably connected with the fixing frame 3, the supporting frames of the net cage frames 1 are arranged into two layers and used for installing net cages with different meshes, the net cages are arranged on the net cage frames 1, the width of the cement pond 2 is 6 meters, the depth is 1.3 meters, the length of the net cages is 5 meters, and the depth is 1 meter.
The net cage frame 1 is used for supporting and fixing a net cage and comprises an outer supporting frame 5, an outer fixing rod 6, an inner fixing rod 4, an inner supporting frame 7 and a bolt 8, the outer supporting frame 5 is arranged on the outer fixing rod 6, the inner supporting frame 7 is arranged on the inner fixing rod 4, the inner fixing rod 4 is welded on the outer fixing rod 6, threaded holes are formed in the center positions of the outer fixing rod 6 and the inner fixing rod 4, the bolt 8 is in threaded connection with the outer fixing rod 6 and the inner fixing rod 4, the net cage upper line of the outer layer is tied at two ends of the outer fixing rod 6, the net cage of the outer layer is fixed by the outer supporting frame 5, the net cage upper line of the inner layer is tied at two ends of the inner fixing rod 4, and the net cage of the inner layer is fixed by the inner supporting frame 7. The outer support frame 5 can be round, oval or rectangular, the inner support frame 7 can be round, oval or rectangular, the shapes of the outer support frame 5 and the inner support frame 7 can be the same or different, in the embodiment, the outer support frame 5 is round, and the inner support frame 7 is rectangular. The end side surface of the outer layer net cage is half of the shape of an outer support frame 5, the end side surface of the inner layer net cage is half of the shape of an inner support frame 7, and the net cage frame 1 is used for facilitating the replacement of the net cage.
The net cages play a dual role of cultivation and screening, the critical period of cultivation is required to be started from 2cm to 12cm of fry body length, meshes of the net cages are classified into first-grade to sixth-grade net cages from small to large according to 2cm to 12cm of fry body length, and the net cages are woven by hard net wires with the diameter of more than 1 mm.
The small balls are arranged on the steel ropes of the net cage at certain intervals, and when the net cage is replaced, the cage opening of a new net cage is sleeved below the cage opening of an old net cage from top to bottom, and the steel ropes are tensioned, so that the new net cage and the old net cage are in seamless butt joint, and fish escape is prevented in the replacement process.
The invention also provides a screening method of micropterus salmoides fries, which is to cultivate 1.8-2.2 cm micropterus salmoides fries according to the following modes:
s1, pre-screening and cultivating, namely mounting a dense-mesh net cage on an inner support frame 7 of a net cage frame, stocking 1.8-2.2 cm of largemouth black bass fry (the largemouth black bass fry is primarily cultivated in half a month after being opened), cultivating for five days according to a conventional method, and then carrying out one-to-five-stage screening and cultivating;
s2, grading, screening and cultivating:
a. primary screening and cultivation: a second-level net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the dense-mesh net cage; the outer supporting frame 5 is sleeved with a first-level net cage. And (4) guiding the fry into the second-stage net cage, wherein larger fry are remained in the second-stage net cage due to density stress, and smaller fry enter the first-stage net cage. When the feed is fed, the first-stage net cage is firstly carried out, and then the second-stage net cage is carried out, and the feed is cultivated for seven days;
b. secondary screening and cultivation: a third-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the second-stage net cage; the outer supporting frame 5 is sleeved with a secondary net cage which is in butt joint with the primary net cage. And (3) leading the fry into the butted net cages, wherein the larger fry can stay in the led-in third-stage net cage due to the density stress, and the smaller fry can swim into the second-stage net cage. When the feed is fed, the second-level net cage is firstly arranged and then the third-level net cage is arranged. Cultivating for seven days;
c. and (3) three-stage screening and cultivation: a fourth-level net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the third-level net cage; the outer supporting frame 5 is sleeved with a third-level net cage which is in butt joint with the second-level net cage. The fry is guided into the butted net cages, and due to the stress of density, the larger fry can stay in the guided four-stage net cages, and the smaller fry can swim out to enter the three-stage net cages. When the feed is fed, the three-stage net cage is firstly arranged and then the four-stage net cage is arranged. Cultivating for seven days;
d. four-stage screening and cultivation: a five-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is in butt joint with the four-stage net cage; the four-stage net cage is sleeved on the outer support frame 5 and is in butt joint with the three-stage net cage. And (3) leading the fry into the butted net cages, wherein the larger fry can stay in the five-stage net cages after leading in and the smaller fry can swim out to enter the four-stage net cages due to density stress. When the feed is fed, the four-stage net cage is firstly arranged and then the five-stage net cage is arranged. Cultivating for seven days;
e. five-stage screening and cultivation: a six-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is in butt joint with the five-stage net cage; the outer supporting frame 5 is sleeved with a five-stage net cage which is in butt joint with the four-stage net cage. The fry is guided into the butted net cages, and due to the stress of density, larger fry can remain in the guided six-stage net cages, and smaller fry can swim out;
f. cultivating for seven days, then clearing the pond, combining the seedlings in the six-level and five-level net cages and the cement pond together, and dividing the seedlings into three categories to carry out conventional reinforced cultivation. Culturing for twenty days until the body length reaches 11.5cm-12.5 cm.
In the seedling released in the No. 5/month and No. 10 seedling of the embodiment, the average survival rate is improved by 20 percent according to the calculation of each square meter through the cultivation process. Three batches of fries are subjected to reinforced cultivation, six-level and five-level net cages are subjected to reinforced cultivation, the weight specification of the result is uniform, the difference is not significant (p < 0.05), the total amount accounts for 85.1%, the fish fries in the cement pond are subjected to reinforced cultivation, the specification is uniform, the fish fries account for 14.9% of the total amount, and the difference is significant (p < 0.01 < 0.05).
Example 2
In this embodiment, the width of the cement pond 2 of the largemouth bass fry screening system is 5.5 meters, the depth is 1.2 meters, the width of the net cage is 5 meters, and the depth is 1 meter.
The cultivation method of this embodiment is:
s1, pre-screening and cultivating, namely mounting a dense-mesh net cage on an inner support frame 7 of a net cage frame, stocking 1.8-2.2 cm of largemouth black bass fry (the largemouth black bass fry is primarily cultivated in half a month after being opened), cultivating for five days according to a conventional method, and then carrying out one-to-five-stage screening and cultivating;
s2, grading, screening and cultivating:
a. primary screening and cultivation: a second-level net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the dense-mesh net cage; the outer supporting frame 5 is sleeved with a first-level net cage. And (4) leading the fry into the second-stage net cage, wherein the larger fry is remained in the second-stage net cage due to the density stress, and the smaller fry enters the first-stage net cage. When the feed is fed, the first-stage net cage is firstly and the second-stage net cage is secondly used for culturing for ten days;
b. secondary screening and cultivation: a third-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the second-stage net cage; the outer support frame is sleeved with a secondary net cage 5 which is in butt joint with the primary net cage. And (3) leading the fry into the butted net cages, wherein the larger fry can stay in the led-in third-stage net cage due to the density stress, and the smaller fry can swim into the second-stage net cage. When the feed is fed, the second-level net cage is firstly arranged and then the third-level net cage is arranged. Cultivating for ten days;
c. and (3) three-stage screening and cultivation: a fourth-level net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is butted with the third-level net cage; the outer support frame is sleeved with a third-stage net cage 5 which is in butt joint with the second-stage net cage. The fry is guided into the butted net cages, and due to the stress of density, the larger fry can stay in the guided four-stage net cages, and the smaller fry can swim out to enter the three-stage net cages. When the feed is fed, the three-stage net cage is firstly arranged and then the four-stage net cage is arranged. Cultivating for ten days;
d. four-stage screening and cultivation: a five-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is in butt joint with the four-stage net cage; the four-stage net cage is sleeved on the outer support frame 5 and is in butt joint with the three-stage net cage. And (3) leading the fry into the butted net cages, wherein the larger fry can stay in the five-stage net cages after leading in and the smaller fry can swim out to enter the four-stage net cages due to density stress. When the feed is fed, the four-stage net cage is firstly arranged and then the five-stage net cage is arranged. Cultivating for ten days;
e. five-stage screening and cultivation: a six-stage net cage is arranged on an inner support frame 7 at the upper half part of the net cage frame and is in butt joint with the five-stage net cage; the outer supporting frame 5 is sleeved with a five-stage net cage which is in butt joint with the four-stage net cage. The fry is guided into the butted net cages, and due to the stress of density, larger fry can remain in the guided six-stage net cages, and smaller fry can swim out;
f. cultivating for ten days, then clearing the pond, combining the seedlings in the six-level and five-level net cages and the cement pond together, and dividing the seedlings into three categories to carry out conventional reinforced cultivation. Culturing for twenty days until the body length reaches 11.8cm-13.2 cm.
In the seedling released in the No. 5/month and No. 10 seedling of the embodiment, the average survival rate is 73% and is improved by more than 20% according to the calculation of each square meter through the cultivation process. The weight specification of the three batches of fries is uniform through reinforced cultivation, the weight specification of the six-level and five-level net cages is uniform through reinforced cultivation, the difference is not obvious (p is less than 0.05), the total amount accounts for 80%, and the specification is uniform and the difference is obvious (0.01 is less than 0.05) through reinforced cultivation of the fries in the cement pond.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (9)
1. The largemouth bass fry screening system is characterized by comprising a cement pond, a net cage frame, a fixing frame and a plurality of net cages, wherein the cement pond is used for erecting the net cages and cultivating fries, the fixing frame is clamped on long ridges on two sides of the cement pond, the net cage frame is installed on the fixing frame and is rotatably connected with the fixing frame, two layers of supporting frames of the net cage frame are arranged and used for installing the net cages with different meshes, and the width and the depth of each net cage are smaller than those of the cement pond.
2. The micropterus salmoides fry screening system of claim 1, wherein the net cage support comprises an outer support frame, outer fixing rods, inner fixing rods, an inner support frame and bolts, the outer support frame is arranged on the outer fixing rods, the inner support frame is arranged on the inner fixing rods, the inner fixing rods are welded on the outer fixing rods, the outer fixing rods and the inner fixing rods are provided with threaded holes at central positions, the bolts are in threaded connection with the outer fixing rods and the inner fixing rods, the net cage headlines of the outer net cage are tied at two ends of the outer fixing rods, the net jackets of the outer net cage are fixed by the outer support frame, the net cages of the inner net cage are tied at two ends of the inner fixing rods, and the net jackets of the inner net cage are fixed by the inner support frame.
3. The micropterus salmoides fry screening system of claim 2, wherein the outer support frame is circular, oval or rectangular, and the inner support frame is circular, oval or rectangular.
4. The micropterus salmoides fry screening system of claim 3, wherein the end side of the outer cage is half of the shape of the outer support frame, and the end side of the inner cage is half of the shape of the inner support frame.
5. The micropterus salmoides fry screening system of claim 4, wherein meshes of the net cages are evenly arranged in more than five grades according to the fry length of 2cm to 12 cm.
6. The micropterus salmoides fry screening system of claim 5, wherein the net cage is woven by hard net wires with the diameter of more than 1 mm.
7. The largemouth bass fry screening system of claim 5, wherein the steel ropes of the net cage are provided with small balls at certain intervals, when the net cage is replaced, the cage mouth of a new net cage is sleeved under the cage mouth of an old net cage from top to bottom, and the steel ropes are tightened, so that the new net cage and the old net cage are in seamless butt joint, and fish escape is prevented in the replacement process.
8. The micropterus salmoides fry screening system of claim 2, wherein the fixing frame comprises a clamping frame and a clamping column, the clamping column is arranged on the clamping frame and is provided with a height adjusting device, the top end of the clamping column is provided with a clamping seam, the clamping seam is provided with a clamping socket, and the cap head of the bolt is clamped in the clamping socket.
9. A micropterus salmoides fry screening method is characterized in that the micropterus salmoides fry screening system of the claims 1-8 is adopted to cultivate the micropterus salmoides fry in the following way:
s1, pre-screening and cultivating, namely installing a dense-mesh net cage on an inner support frame of a net cage frame, stocking 1.8-2.2 cm of fish fries, cultivating for five to seven days according to a conventional method, and then carrying out one-to five-stage screening and cultivating;
s2, grading, screening and cultivating:
a. primary screening and cultivation: a second-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the dense-mesh net cage; the outer supporting frame is sleeved with a first-level net cage. The fry is guided into the second-stage net cage from the rotary net cage frame, the larger fry is left in the second-stage net cage due to the stress of density, the smaller fry enters the first-stage net cage, and the first and second net cages are cultivated for seven to ten days when the feed is fed;
b. secondary screening and cultivation: the inner support frame at the upper half part of the net cage frame is provided with a third-stage net cage which is in butt joint with the second-stage net cage; sleeving a second-stage net cage on the outer support frame, butting with the first-stage net cage, and guiding the fries into the butted net cages, wherein larger fries can remain in the guided third-stage net cage due to density stress, and smaller fries can swim into the second-stage net cage;
c. and (3) three-stage screening and cultivation: a fourth-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the third-stage net cage; sleeving a third-stage net cage on the outer support frame, butting with the second-stage net cage, and guiding the fries into the butted net cages, wherein due to density stress, larger fries can remain in the guided fourth-stage net cage, and smaller fries can swim out to enter the third-stage net cage, and are cultivated for seven to ten days after the third-stage net cage and the fourth-stage net cage are fed with feed;
d. four-stage screening and cultivation: a fifth-level net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the fourth-level net cage; the outer support frame is sleeved with a four-stage net cage which is in butt joint with the three-stage net cage, the fry is guided into the butt-joint net cage, large fry can stay in the guided five-stage net cage due to the stress of density, and small fry can swim out to enter the four-stage net cage. When the feed is fed, the four-stage net cages are firstly carried out, and then the five-stage net cages are carried out, and the feed is cultivated for seven to ten days;
e. five-stage screening and cultivation: a six-stage net cage is arranged on an inner support frame at the upper half part of the net cage frame and is in butt joint with the five-stage net cage; the outer support frame is sleeved with a five-stage net cage which is in butt joint with the four-stage net cage, the fry is guided into the butt joint net cage, large fry can remain in the guided six-stage net cage due to the stress of density, and small fry can swim out;
f. cultivating for seven to ten days, then clearing the pond, combining the seedlings in the six-level and five-level net cages and the cement pond together, dividing the seedlings into three categories, and carrying out conventional reinforced cultivation, wherein the seedlings are cultivated for eighteen to twenty-two days, and the body length reaches 11.5cm-12.5 cm.
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