CN101278662A - A fish nest for artificial breeding of loach - Google Patents

Abstract

The invention discloses a fish nest for artificial breeding of loach, which comprises a net cage with an open top and palm bark. The net cage has a double-layer structure, and a partition net with a mesh size of 10-15 mm is fixed between the upper and lower layers. , the middle part of the surface of the separating net is provided with an induced fish nest, and the palm bark is laid on the induced fish nest; the lower layer of the cage is provided with an egg-collecting bed with meshes less than or equal to 120 meshes, and the collected eggs The area of the egg bed is greater than 90% of the area of the bottom of the box; the mesh on at least one side of the lower layer of the net box is connected with the box body in a detachable manner. The fish nest of the invention can effectively prevent broodstock from devouring fertilized eggs, and can collect eggs at the bottom of the box, thereby further increasing the hatching rate of fertilized eggs and increasing the emergence of broodstock per unit, and is convenient to use and has good application prospects.

Description

A fish nest for artificial breeding of loach

technical field

The invention relates to a device for cultivating fish, in particular to a fish nest for artificially breeding loach.

Background technique

Loach is known as "Ginseng in Water", which is delicious, tender and nutritious. According to analysis, every 100 grams of loach meat contains 18.4 grams of protein, 2.9 grams of fat, and the content of vitamin B1, A, and C is higher than that of other fish. . In addition, loach is mild in nature, sweet in taste, and enters the liver, spleen and kidney. It also has high medical value. Therefore, in recent years, the export trade volume of loach has increased year by year, and the consumption of loach in China has also shown an upward trend. As natural loach resources are far from meeting people's consumption needs, loach aquaculture has entered a period of rapid development; at the same time, loach has become an important aquaculture object because of its strong adaptability, few diseases, high survival rate, and easy bait .

In the breeding process of loach, cultivating sufficient seedlings and improving the hatching rate of seedlings are the key to the success or failure of breeding. In the prior art, there are mainly two methods of artificial insemination and natural spawning for cultivating seedlings. However, due to the small size of the loach and a lot of mucus on the body surface, it is very difficult to carry out artificial insemination. In addition, the artificial insemination process will damage the parent fish Very large, it is very easy to cause postpartum death of broodstock. Therefore, the seed that is used for artificial culture mainly is to rely on broodstock natural mating, natural spawning to obtain at present, discloses a kind of loach artificial breeding method as Chinese invention patent CN1177526C, puts the broodstock after the induced labor into the net that is set up in the spawning pond and lay palm bark on the bottom of the net cage to induce it to lay eggs on the bark. In order to prevent the broodstock from swallowing the fertilized eggs, the broodstock will be caught from the cage after spawning, and in order to Control the number of fertilized eggs in a unit of water to increase the hatching rate, and also collect the fertilized eggs attached to the palm bark and transfer them to other cages or hatching buckets for incubation.

However, the above-mentioned artificial breeding method has the following disadvantages: 1. more than ten groups or even dozens of groups of broodstock are often placed in a net cage, and the spawning time of each female fish is inconsistent, so it is difficult to distinguish between spawning and non-spawning At the same time, the fishing behavior will also affect the spawning of other broodstock; ②If only one pair of broodstock is placed in a net cage, the efficiency of seedling breeding will be greatly reduced. In addition, because the spawning time of the broodstock cannot be accurate Therefore, it is difficult to grasp the timing of catching broodstock from net cages, and delayed catching will cause broodstock to swallow fertilized eggs, seriously affecting the number of fertilized eggs; and because loach is small and slippery, it moves quickly, which also causes certain difficulties to fishing work. Difficulty; ③Because the loach fertilized eggs are slightly sticky, they are easy to naturally debond and slide to the bottom of the box from the palm bark. In addition, the loach is naturally active, and under its violent swimming and stirring, most of the eggs slide to the bottom of the box. Because the eggs at the bottom of the box are difficult to collect, the number of eggs in the water body cannot be controlled, so it is difficult to improve the hatching rate.

Contents of the invention

The purpose of the present invention is to provide a fish nest for artificial breeding of loach, which can not only effectively prevent broodstock from devouring fertilized eggs, but also collect most of the eggs, thereby further improving the hatching rate of fertilized eggs and increasing the emergence of broodstock per unit.

In order to achieve the above-mentioned purpose of the invention, the technical scheme that the present invention adopts is: a kind of fish nest that artificial breeding loach is used, comprises the net cage of top opening and palm tree bark, and described net cage is double-layer structure, and is fixedly installed between the upper and lower floors. There is a separation net with a mesh size of 10-15 mm, and an induced fish nest is placed in the middle of the surface of the separation net, and the palm bark is laid on the induced fish nest; An egg-collecting bed with meshes less than or equal to 120 meshes is provided, and the area of the egg-collecting bed is greater than 90% of the area of the bottom of the box; the mesh on at least one side of the lower layer of the net box forms a detachable connection with the box body.

In the above, the mesh of the separating net is the same as or close to the mesh of the cage, and can be made of polyethylene mesh. Its effect is to prevent loach from drilling to the lower floor from the mesh to eat fertilized eggs on the one hand, and to eat fertilized eggs on the other hand. Allow the fertilized eggs to drop onto the egg-collecting bed through the mesh; the function of the egg-collecting bed is to collect eggs, and its shape can be the same or similar to the bottom of the box, and the length of each side is as close as possible to the bottom of each corresponding box, so that its area is close to the bottom of the box area, so as to ensure that most of the eggs that slide from the separation net fall on the egg collection bed; the mesh of the egg collection bed is less than or equal to 120 mesh, which is to collect fertilized eggs, and the size is smaller than the general egg diameter. And can pass through water and some very fine impurities; fertilized eggs can be dispersed after collection, so as to control the number of eggs according to the oxygen content of the water body and improve the hatching rate. Of course, the collected eggs can also be placed in a flowing water environment , to speed up their hatching and increase their hatching rate.

In the above technical solution, the height of the lower layer of the cage is between 10 and 15 centimeters.

In a further technical solution, the induced fish nest is in the shape of a square, and its side length is between one-third and two-thirds of the side length of the partition net, usually, preferably one-half.

In the above, the use of induced fish nests and the laying of palm bark on it is to induce broodstock to lay eggs on the palm bark. This can not only speed up the spawning speed, but more importantly, it can control the spawning site. The induced fish nest is placed in the middle of the separation net, so that the fertilized eggs fall from the middle, so as to collect eggs to the maximum extent.

In a further technical solution, the egg-collecting bed is located on the bottom surface of the cage.

When the present invention is used, several groups of broodstock are placed on the upper layer of the net cage, and after they lay eggs on the palm bark, most of the fertilized eggs will pass through the separation due to the natural debonding of the fertilized eggs and the stirring of the water body by the broodstock. The net falls to the lower egg-collecting bed, and since the mesh at the bottom of at least one side of the cage is detachable, the egg-collecting bed can be freely moved out of the cage through the gap of the mesh, thereby collecting most of the eggs, and then can Carry out the next incubation operation. In this process, since the broodstock is placed on the upper layer of the net cage, the fertilized eggs and broodstock are separated by the separation net, so there will be no situation of swallowing fertilized eggs, and the number of eggs is guaranteed; and the setting of the egg collection bed can be maximized. Collect eggs to the greatest extent, and increase the hatching rate of fertilized eggs through subsequent operations such as dispersal; the combination of these two steps can greatly increase the emergence of unit broodstock.

Due to the adoption of the above-mentioned technical solution, compared with the prior art, the present invention has the following advantages:

1. Since the fish nest of the present invention adopts a double-layer net cage structure, the fertilized eggs and parent fish can be separated by a separation net, thereby preventing the parent fish from swallowing the fertilized eggs and ensuring the number of eggs to the greatest extent.

2. Since the present invention adopts the egg collection bed to collect eggs, and cooperates with the mesh of the detachable structure at the bottom of the side of the box, most of the fertilized eggs can be moved out of the cage, thereby collecting most of the eggs, so as to facilitate the next step. One-step hatching operation, such as subsequent egg dispersal operation and placing in a flowing water environment, can greatly increase the hatching rate of fertilized eggs.

3. The net cage of the present invention can be used continuously, as long as the egg collection bed and induced fish nest are replaced, it is easy to use and has a good application prospect.

Description of drawings

Accompanying drawing 1 is the structure diagram of embodiment 1 of the present invention. (mesh not shown)

Among them: 1. Cage; 2. Separation net; 3. Egg collection bed; 4. Mesh; 5. Induced fish nest.

Detailed ways

The present invention will be further described below in conjunction with embodiment, but should not limit protection scope of the present invention with this:

Embodiment one:

A fish nest for artificial breeding of loach, comprising a net cage 1 with an open top and palm bark, the net cage 1 has a double-layer structure, and a partition net 2 with a mesh size of 10 to 15 mm is fixed between the upper and lower layers , the middle part of the upper surface of the separating net 2 is provided with an induced fish nest 5, and the palm bark is evenly laid on the induced fish nest 5; Egg bed 3, the area of the ovum-collecting bed 3 is 96.04% of the box bottom area; the mesh 4 on at least one side of the lower layer of the net box is detachably connected to the box body.

In the above technical solution, the induced fish nest is in the shape of a square, and its side length is 1/2 of the bottom of the box.

In the above, the double-layer net cage is made of a steel bar with a diameter of 0.8 cm into a cube frame with a side length of 100 cm, and a second layer of square steel bar frame is erected at 12 cm from the bottom surface. The four sides and the bottom of the whole frame are surrounded by polyethylene mesh with a mesh size of 1.5cm, and the mesh on one side of the wall mesh at a height of 0-12cm from the bottom is connected to the corresponding box with plastic self-adhesive buckles, so that It can open and close freely.

In the above, the described egg collection bed is made of a steel bar with a diameter of 0.5cm and is a square frame with a side length of 98cm, on which 120 mesh sieves are sewn.

In the above, the induced fish nest is a 50cm x 50cm grid-shaped frame made of 0.5cm steel bars, on which some palm bark is uniformly laid.

In actual use, the egg-collecting bed is placed on the lower layer of the double-layer cage, the induced fish nest is placed on the upper layer of the double-layer cage, and the broodstock after induced spawning is placed on the upper layer of the cage. After natural spawning, Collect most of the eggs, move the egg-collecting bed out of the cage through the mesh gap at the bottom of the side of the cage, and then disperse the collected eggs into the water body, preferably 60,000-80,000 eggs per cubic meter of water , or suspend the induced fish nest and the egg collection bed together in the hatching ring or the hatching pool for hatching.

The above facilities were tested and applied in the scientific research base of Soochow University Fisheries Research Institute. Practice has proved that after adopting this facility, the postpartum survival rate of broodstock increased from 65% of the original artificial insemination to 87%, and the emergence of loach female broodstock per unit Increased by about 30%.

Claims (4)

1. fish nest that the artificial propagation loach is used, comprise open-topped net cage and palmae bark, it is characterized in that: described net cage is a double-decker, be fixed with mesh size between the levels and be 10～15 millimeters separate mesh, be placed with at the middle part of described separate mesh upper surface and induce fish nest, described palmae bark to be laid on described inducing on the fish nest; Be provided with mesh in the lower floor of described net cage smaller or equal to 120 purpose collection ovum beds, the area of described collection ovum bed is greater than 90% of case floor space; The net sheet of at least one side of described net cage lower floor constitutes detachable the connection with casing.

2. the fish nest that artificial propagation loach according to claim 1 is used is characterized in that: the height of described net cage lower floor is between 10 to 15 centimetres.

3. the fish nest that artificial propagation loach according to claim 1 is used is characterized in that: the described fish nest of inducing is a matrix pattern, its length of side the described separate mesh length of side 1/3rd to 2/3rds between.

4. the fish nest that artificial propagation loach according to claim 1 is used is characterized in that: the described ovum berth that collects is on the bottom surface of described net cage.

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