CN1088727A

CN1088727A - Method for breeding bullfrogs

Info

Publication number: CN1088727A
Application number: CN92111785A
Authority: CN
Inventors: 刘国安; 秦兆贵; 陈学文; 孟刚; 孟蒲芳
Original assignee: XIANGTAN AQUATIC PRODUCTS INST
Current assignee: XIANGTAN AQUATIC PRODUCTS INST
Priority date: 1992-12-28
Filing date: 1992-12-28
Publication date: 1994-07-06

Abstract

Method for breeding bullfrogs belongs to the breed of general biology.This method is provided with the net cage of culturing bullfrog in water surface 0.5m depths, the area of net cage accounts for 8～20% of total coverage of water in the water body, bullfrog all carries out net cage from tadpole to the full feeding process that becomes the frog, bait table is set in the net cage, and throw something and feed with manufactured feed, net cage adopts floating type and fixed two kinds of fixing means in water body, the mesh of net cage is 16～18 orders.The bullog cultivation method of the ecological combination of the fish frog makes full use of water body, and the fish frog is interests each other, saves land used, water, labour and expense, improves fish and frog yield simultaneously, is a kind of cost-effective breed bullfrog method.

Description

Method for breeding bullfrogs

Method for breeding bullfrogs belongs to the breed of general biology.

The bullog cultivation of present China, the tadpole stage generally directly puts in a suitable place to breed in water body, being transferred to shallow-layer clear water pond middle-high density after the metamorphosis, to culture disclosed as CN1033143A be this method, and number of patent application 89105800.1 disclosed be the froglet after the metamorphosis to be put into the frog pond that is provided with bait table culture; The problem that these cultural methods exist is: the area in tadpole pond generally should be 3～4 times of frog pool area, so floor space is big; With cement pit high-density rearing bullfrog, the excreta of the frog, residual bait etc. are stayed in the pond, and bullfrog is immersed in then morbidity easily in the pond of this pollution all day, therefore must regularly scrub frog pond and change water, to keep the cleaning of cement pit and water body, this raising method need consume more labour.How to make full use of water body, make the fish frog in the water body interests each other of growing, improve the total economic benefit of water body, can save the labour again then is purpose of the present invention.

The technical scheme that realizes the object of the invention is that the net cage of culturing bullfrog is set in water surface 0.5m depths, the area of net cage accounts for 8～20% of the water body gross area in the water body, bullfrog all carries out net cage from tadpole to the overall process that becomes the frog, the fixed form that net cage is provided with in water body has floating type and fixed, and the net cage mesh is 16～18 orders.

Be described in further detail the present invention below in conjunction with accompanying drawing.

Fig. 1 bullfrog net cage schematic diagram;

The fixed tank tower schematic diagram of Fig. 2;

Fig. 3 floating type tank tower schematic diagram;

Net cage schematic layout pattern in Fig. 4 water body.

In water surface the cage culture bullfrog is set, make in the water body fish frog interests each other, all excretas of the frog (dung, urine, decortication) and residual bait are stayed in the water body, a part can directly be utilized by fish, another part can be utilized by plankton in the water body after bacterial decomposition, promoted planktonic procreation in the water body, plankton is again that tadpole and fish utilize, and promotes growing of fish and tadpole; Simultaneously material is in the benign cycle in the water body, makes water body " live and feel well ".According to test, the depth of water is 1.5 meters throughout the year, and the fishpond of per mu yield fresh fish 250～300 kilograms (thick, thin squamas half and half) is provided with the foster frog net cage that accounts for the gross area 8～20%, the material that substantially can not need refertilize, thereby the fertilizer expenses of saving the fishpond; The mesh of frog case is generally 16～18 orders, plankton is along with the net cage of can freely coming in and going out that flows of water, data according to plankton and water chemistry mensuration show, water chemistry that net cage is inside and outside and plankton reaction basically identical, there is not significant difference on the statistics, though the tadpole in the net cage or the frog can not freely be come in and gone out with net cage fish outward, the tadpole and the frog utilize plankton in the water body and dissolved oxygen, mineral salt but with the fish equalization.Be arranged on the frog case on water body top layer, because the diffusion naturally of solute and material is recycling in the water body, water body remains pure and fresh, so both can save the labour who scrubs frog pond and change water, the tadpole or the frog are lived in the sufficient water body of dissolved oxygen, thereby it is vigorous to ingest, fast growth, the tadpole that hatches need in net cage can be finished metamorphosis in about 45 days, support frog method ahead of time than tradition, individual weight increases more than 15% than the tradition method of supporting, tadpole distortion ratio average out to 97%, higher by 16～22% than the foster method of tradition, it is that fish and plankton utilize that the bullog cultivation method of the ecological combination of this fish frog makes the excreta of the frog, and planktonic growth can be used as the bait of tadpole or fish, thereby interests promote mutually each other, are beneficial to fish frog bumper harvests.

The net cage (figure one) of culturing bullfrog is different from fish culture cage, the most tangible difference is mesh, fish box mesh minimum is 1 * 1cm, and the mesh of frog case is 16～18 orders, the material of net cage can form with plastics, nylon, the braiding of continuous synthetic fibre, and the size of net cage has several specifications: as 3 * 3 * 1.5(M), and 2 * 2 * 1.5(M) or 3 * 3 * 0.75(M), visual water depth, the object of shape and breed and deciding.

The fixed form of frog case has floating type and fixed two kinds.Floating type net cage as shown in Figure 3 is provided with, the available timber of framework (2), bamboo or buoyancy plastics are made, make sinker with stone, on the column (1), column was grown about 2 meters around net cage was fixed on tree lace, can make of bamboo bar or batten, about 0.5 meter of every root post entry is surfaced about 1.5 meters, about 5～6 root posts in every limit around the net cage, for frog case guard is fully launched, the peripheral upper, middle and lower of guard is all used clasp (available cloth nail is made the toggle shape) and is separately fixed on the column; For making the fixing firm of net cage, available horizontal bamboo bar is linked to be integral body between all columns, the first road cross bar (3) is located at 50cm place, underwater, the second road cross bar (4) is located at about 1.5m place on the water surface, frame bamboo wood and be barricaded as cloudy canopy (5) with other materials and prevent sun direct projection again on the second road cross bar, the net cage fixed form of this floating type is suitable for the water body that the water surface is big, water level is more stable deeply again, should adopt this fixed as the pool more than 10 mu, reservoir, lake arm.Fixed net cage as shown in Figure 2, strut length will be more than 3 meters, and skewer is gone in the earth of water body bottom, the first road cross bar is located at long-term water level place, second road is located at about 50cm place on the water surface, high temperature season should set up cloudy canopy again on the 3rd road cross bar of 1m place setting on the water surface, this fixed form is suitable for the water body that area is less, water level is more shallow.

The fixed form of net cage also can be determined with the breed stage of bullfrog, raise tadpole and can adopt the net cage of highly about 70cm, erection mode should be used fixed, and for making full use of the water surface, this type of net cage can be put into pond on a hill in order to irrigate, when pond on a hill water level after " double rush for harvesting and sowing " reduces gradually, survive the winter tadpole also metamorphosis can be moved to other water bodys, continue to culture.

The net cage area accounts for the little water body below 8～20%, two mu of the gross area of water body, and fertility is thinner again, the about big water body more than 8%, five mu of the net cage area of placement, and the area of net cage can account for 15～20%, specifically looks the decision of water body fertility again.For water body inside and outside guaranteeing net cage exchanges fully, the layout of net cage is answered science, reasonable.Net cage setting should be adopted layout shown in Figure 4 in the general water body, the net cage spacing is about 1.5m, line-spacing 2～3m, be located at three directions in east, south, west of water body, both be beneficial to the inside and outside water body exchange of casing, be beneficial to the fish pond again and work when catching hairnet and draw in the net, but big water bodys such as lake, reservoir are not limit by this then.

The cage culture bullfrog also should be provided with bait table in case, the tadpole bait table is suspended on the net cage center, and the 10cm place, underwater of long-term water level is on abnormal back bait table should be bubbled through the water column.Put tadpole amount in a suitable place to breed by every square metre of net cage planimeter, put into 150～180 of tadpoles about 3cm, and by 3～8% of the TBW manufactured feed of throwing something and feeding, raised about 45 days, when tadpole was abnormal, bait table changed bullfrog food platform in net cage, and by 3～5% of the TBW of last food platform froglet, the manufactured feed of throwing something and feeding, the setting of bait table in the net cage can be provided with 1～3 according to froglet quantity, bait table is made of wooden frame and fiber cloth, and area can be 1m ²For about.The throw something and feed bait of froglet, general twice, 4～5 months every days, every square metre of net cage can produce 11～13 kilograms of the individual commodity frogs of 150～300 grams, and is higher more than 9% than cement pit output.Feed and raise season, scrubbed the food platform 1～2 time in every month, can in net cage, carry out, net cage was reached near waters sterilize 2～3 times dosage 1～2g/m with bleaching powder in every month ³, support frog survival rate to improve.

The method for breeding bullfrogs of the ecological combination in the fish pond that the present invention proposes, both do not wanted frog pond, do not build the tadpole pond yet, raising overall process from tadpole to the commodity frog is all finished net cage, support the frog than tradition and save land used, water, labour and expense, the tadpole distortion ratio is higher by 22% than cement pit simultaneously, higher by 15% than earth pond, abnormal time ratio tradition is supported the frog ahead of time more than 25 days, yield per unit area is higher by 8% than earth pond, and is higher by 12% than cement pit, breed fish 30～40 yuan of fertilizer costs of every mu of saving simultaneously, per mu yield improves 8～17%, is a kind of cost-effective method for breeding bullfrogs.

Claims

1, a kind of method for breeding bullfrogs, comprise employing food platform, feed with manufactured feed, feature of the present invention also is to be provided with in water surface 0.5m depths the net cage of breed bullfrog, the area of net cage accounts for 8～20% of the water body gross area in the water body, and bullfrog all carries out net cage from tadpole to the full breeding process that becomes the frog.

2, by the described method for breeding bullfrogs of claim 1, the fixed form that net cage is provided with in water body has floating type and fixed.

3, by claim 1 or 2 described method for breeding bullfrogs, the net cage mesh that it is characterized in that culturing bullfrog is 16～18 orders.