CN101278662A

CN101278662A - Egg collector for artificially propagating loach

Info

Publication number: CN101278662A
Application number: CNA200810108046XA
Authority: CN
Inventors: 凌去非
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2008-05-13
Filing date: 2008-05-13
Publication date: 2008-10-08

Abstract

The invention discloses a fish nest used for breeding loach artificially, which comprises a pot with an opening at the top and palm barks. The pot has a double-layer structure, a separation net with 10 to 15mm of meshes is fixedly arranged between an upper layer and a lower layer, and the middle part of the upper surface of the separation net is provided with an inducing fish nest. The palm barks are laid on the inducing fish nest. The lower layer of the pot is provided with an egg-collecting bed with mesh holes which are less than or equal to 120 meshes, and the area of the egg-collecting bed is larger than 90 percent of the area of the pot bottom. At least a net piece at one lateral side of the lower layer of the pot is connected with a pot body in demountable form. The fish nest of the invention can effectively prevent parent fishes from swallowing germ cells, and the egg grain at the bottom of the pot can also be collected, which further improves the hatch rate of the germ cells, improves the breeding quantity of unit parent fish, thus being convenient for using and having good application prospect.

Description

The fish nest that a kind of artificial propagation loach is used

Technical field

The present invention relates to the device that a kind of cultured fishes are used, be specifically related to the fish nest that a kind of artificial propagation loach is used.

Background technology

Loach is described as " genseng in the water ", and its delicious flavour, fine and tender taste, nutritious according to one's analysis, contain protein 18.4 gram, fat 2.9 grams in every hectogram loach meat, and vitamin B1, A, C content are all higher than other fish.In addition, loach property is flat, flavor is sweet, go into liver spleen kidney, pharmaceutically also has higher value, and therefore, loach export trade amount increases year by year in recent years, and the consumption figure of domestic loach is also in rising trend.Because natural loach resource far can not satisfy people's consumption demand, therefore the loach aquaculture also enters the fast-developing phase; Simultaneously, loach is strong because of its adaptability, disease is few, survival rate is high, bait is easy to get, and has become important aquaculture object.

In the breeding process of loach, cultivating sufficient seed and improving the seed incubation rate is that key of success is cultured in decision.In the prior art, cultivate seed and mainly contain artificial insemination and two kinds of methods of natural spawning, and because the loach individuality is less, epidermal mucus is many, and the difficulty of therefore carrying out artificial insemination is very big, in addition, the artificial insemination process is very big to the damage of parent population, very easily causes parent population death in postpartum.Therefore, the seed that is used to propagate artificially at present mainly is by parent population natural mating, natural spawning obtains, a kind of loach artificial raise seedling method is disclosed as Chinese invention patent CN1177526C, parent population after hastening parturition is put into the net cage that is erected at spawning pond, and at net cage bottom laying palmae bark, lay eggs on bark to induce it, in order to prevent the parent population fertilized egg of eating, after laying eggs parent population is caught out from net cage, and in order to control the quantity of fertilized egg in the unit of water body according to the water body oxygen content, improve incubation rate, also collect the fertilized egg of adhering on the palmae bark and it is transferred in other net cages or the hatching pail, hatch then.

Yet, there is following shortcoming in above-mentioned artificial raise seedling method: 1. owing to often place tens groups even tens groups of parent populations in a net cage, and every tail raun egg-laying time is inconsistent, therefore be difficult to differentiate the parent population that lays eggs the back and do not lay eggs, can't really realize fishing for, simultaneously, fish for behavior and also can influence laying eggs of other parent populations; If 2. only place a pair of parent population in a net cage, then breeding efficiency can be reduced greatly, in addition, because the time that parent population lays eggs can't accurately be determined, the moment of therefore fishing for parent population from net cage is difficult to hold, and postpones to catch then to cause the parent population fertilized egg of eating, and has a strong impact on fertilized egg quantity; And because loach body corpusculum is sliding, action has caused certain difficulty also for the work of fishing for rapidly; 3. because loach fertilized egg is a microviscosity; easy natural unsticking and at the bottom of being slipped to case from palmae bark; it is active to add loach natural disposition; under it acutely moves about and stirs; most of ovum grain is slipped at the bottom of the case; because the ovum grain at the bottom of the case is difficult to collect, ovum grain quantity is difficult to improve incubation rate in the uncontrollable water body.

Summary of the invention

The purpose of this invention is to provide the fish nest that a kind of artificial propagation loach is used, can not only effectively prevent the parent population fertilized egg of eating, and can collect most of ovum grain, thereby further improve hatchability of fertile eggs, improve unit parent population output of seedling.

To achieve the above object of the invention, the technical solution used in the present invention is: the fish nest that a kind of artificial propagation loach is used, comprise open-topped net cage and palmae bark, described net cage is a double-decker, be fixed with mesh size between the levels and be the separate mesh between 10～15 millimeters, 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.

Above, the mesh of described separate mesh is identical with the mesh of net cage or approaching, can adopt the polythene net sheet to make its effect, prevent that loach is drilled into lower floor and eats up fertilized egg from mesh on the one hand, allow fertilized egg fall on the collection ovum bed on the other hand by mesh; The effect of described collection ovum bed is to collect the ovum grain, and its profile can be with identical or close at the bottom of the case, and its each length of side makes its area near the case floor space as far as possible near at the bottom of each corresponding case, thereby guarantees to drop on collection ovum bed from the ovum grain overwhelming majority of separate mesh landing; The mesh of described collection ovum bed is smaller or equal to 120 orders, and this is in order to collect fertilized egg, and this size is less than general ovum grain diameter, and can be by water and some superfine impurity; Collect back fertilized egg and can carry out scatter operation, thereby control ovum grain quantity, improve incubation rate, certainly, the ovum grain of collecting can also be placed flowing water environment, accelerate its hatching speed and improve incubation rate according to the water body oxygen content.

In the technique scheme, the height of described net cage lower floor is between 10 to 15 centimetres.

Further technical scheme, 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, usually, be advisable with 1/2nd.

Above, the fish nest is induced in employing, and lay palmae bark thereon, be in order to induce parent population on palmae bark, to lay eggs, this can not only accelerate the speed of laying eggs, and more important is to control the place of laying eggs, and the fish nest of inducing of matrix pattern is placed separate mesh middle part, make fertilized egg fall down, thereby collect the ovum grain to greatest extent from the middle part.

Further technical scheme, the described ovum berth that collects is on the bottom surface of described net cage.

When the present invention uses, earlier some groups of parent populations are placed on the upper strata of net cage, treat that it is after laying eggs on the palmae bark, because the natural unsticking of fertilized egg and parent population are to the stirring of water body, most of fertilized egg can be passed separate mesh and be fallen on lower floor's collection ovum bed, because the net sheet of at least one side bottom of net cage is dismountable, therefore collecting the ovum bed can freely shift out net cage by net sheet breach, thereby collect most ovum grain, can carry out next step hatching operation then.In this process,, fertilized egg and parent population are separated by separate mesh, the situation of eating fertilized egg therefore can not occur, guaranteed the quantity of ovum grain because parent population is placed on the net cage upper strata; And the ovum grain can be farthest collected in being provided with of collection ovum bed, and by follow-up operations such as dispersion, improves the fertilized egg hatching rate; This two step combines, and can improve unit parent population output of seedling greatly.

Because the employing of technique scheme, compared with prior art, the present invention has following advantage:

1. because fish nest of the present invention has adopted the Double-level Reticulated box structure, fertilized egg and parent population can be separated by separate mesh, thereby prevent the parent population fertilized egg of eating, farthest guarantee the quantity of ovum grain.

2. because the present invention has adopted collection ovum bed to collect the ovum grain, and the net sheet of cooperation casing side bottom demountable structure, most of fertilized egg can be shifted out net cage, thereby collect most ovum grain, so that carry out next step hatching operation, as the grain scatter operation of following adopted ovum and be positioned over flowing water environment, can improve the fertilized egg hatching rate greatly.

3. net cage of the present invention can continue to use, and is easy to use as long as change collection ovum bed and induce the fish nest, has a good application prospect.

Description of drawings

Accompanying drawing 1 is the structural representation of the embodiment of the invention one.(mesh does not draw)

Wherein: 1, net cage; 2, separate mesh; 3, collection ovum bed; 4, net sheet; 5, induce the fish nest.

Embodiment

Below in conjunction with embodiment the present invention is further described, but should limit protection scope of the present invention with this:

Embodiment one:

The fish nest that a kind of artificial propagation loach is used, comprise open-topped net cage 1 and palmae bark, described net cage 1 is a double-decker, be fixed with mesh between the levels and be 10～15 millimeters separate mesh 2, be provided with at the middle part of described separate mesh 2 upper surfaces and induce fish nest 5, described palmae bark evenly to be laid on described inducing on the fish nest 5; The lower floor of described net cage 1 is provided with mesh smaller or equal to 120 purpose collection ovum beds 3, and the area of described collection ovum bed 3 is 96.04% of a case floor space; The net sheet 4 of at least one side of described net cage lower floor constitutes detachable the connection with casing.

In the technique scheme, the described fish nest of inducing is a matrix pattern, and its length of side is 1/2nd at the bottom of the described case.

Above, described double-deck net cage is to be the reinforcing bar of the 0.8cm square framework that to make a length of side be 100cm with diameter, sets up second layer square steel bar framework at 12cm place, distance bottom surface.Four sides of whole framework and bottom surface surround with the polythene net sheet of mesh 1.5cm, and wherein the fence net of a side is net sheet the plastics self-thread gluing and the corresponding casing connection at 0～12cm place at distance bottom surface height, makes it folding freely.

Above, described collection ovum bed is to be the reinforcing bar of the 0.5cm square frame that to make a length of side be 98cm with diameter, and seam is put 120 purpose bolting silks on it.

Above, the described fish nest of inducing is four length of sides 50cm * 50cm matrix pattern framework made from the reinforcing bar of 0.5cm, evenly lays some palmae barks on it.

During actual the use, collection ovum bed is placed following one deck of double-deck net cage, induce the fish nest to place top one deck of double-deck net cage, later parent population places the net cage upper strata with hastening parturition, after treating natural spawning, collect most of ovum grain, to collect the ovum bed at net sheet breach and shift out net cage by the net cage side bottom, the ovum grain of collecting can be distributed in the water body, to place 60000～80000 ovum grains in every cubic metre of water body is good, perhaps will induce fish nest and collection ovum bed to be suspended from together in circular hatching channal or the hatchery and hatch.

Above facility is tested and is used in the scientific base of aquatic products research institute of University Of Suzhou, facts have proved, adopt after this facility, parent population survival rate in postpartum was from bringing up to 87% by original test-tube 65%, and the female parent population unit of loach output of seedling has improved about 30%.

Claims

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.