CN103931527A - Method for performing large-scale breeding on freshwater crayfish seedlings - Google Patents

Abstract

The invention relates to the field of crayfish cultivation, in particular to a method for performing large-scale breeding on freshwater crayfish seedlings. The method is characterized by comprising the step of pond reconstruction, wherein a pond is changed to be a pond body with the width of 20 m and length within 300 m, after sludge in the pond bottom is cleaned, fine sand with the thickness of 30 cm to 50 cm is laid, the position from the pond bottom water draining position to the upstream water inlet position slides upwards according to the 15-degree slope, the deepest water level reaches 1.8 m, the shallowest water level keeps 30 cm, high-stem-tip subaquatic plants are suitable for being planted in the shallow water area, water is injected into the area with the deep water position about 1.8 m and the shallow water area position about 30 cm before seedling feeding by 7 to 10 days, 50 kg broken tea cakes are used in each mu for being soaked in the water for 12 hours, and then the freshwater crayfish seedlings are evenly poured into the whole pond. According to the technical scheme, the method reduces the attack rate and the death rate, the seedling survival rate is high, long-distance transport is facilitated, and the cultivation efficiency is improved.

Description

A kind of method of freshwater crayfish seedling propagation in scale

Technical field

The present invention relates to cultivation cray field, is a kind of method of freshwater crayfish seedling propagation in scale.

Background technology

Freshwater crayfish disease is few, growth conditions wide adaptability, and feeding habits are wide, fast growth, aquaculture cost is low.Become at present domestic homely delicacies, also favored by external European Union member countries, price rises according to climbing anxious in recent years, and supply falls short of demand simultaneously.Cause thus the phenomenon at breeding process Prawn seedling critical shortage, its main cause is that female shrimp oogenesis amount is few, and after juvenile prawn departs from parent, survival rate is extremely low.

Summary of the invention

The object of the invention is to provide a kind of method of freshwater crayfish seedling propagation in scale.

The present invention is achieved like this: a kind of method of freshwater crayfish seedling propagation in scale, it is characterized in that pond transformation: pond is changed into 20m wide, 300m is with the pond body of interior length, the fine sand of the peace and quiet rear place mat 30cm-50cm of mud at the bottom of pond, at the bottom of pond drainage position to the upstream place of water inlet by sliding on 15 degree slope aspects, it is dark that deep water level will reach 1.8m, shallow water position keeps 30cm dark, at the suitably high bar tip aquatic plant of plantation of shoal, the ridge, pond is wide more than 2.5m, and more than exceeding 80cm from maximum water level, surrounding is by water level place plantation weeping willow, throw seedling and water was injected to depths 1.8m left and right in first 7-10 days, behind shallow water 30cm left and right, evenly splash in full pond after 12 hours with the broken tea cake immersion of 50kg for every mu, the selection and culture of parent shrimp: selecting the complete healthy male and female shrimp of the four limbs appendage of age more than 10 months 3-4 month, ratio is 2:1, the single weight of female shrimp is more than 40g, more than the long 6cm of body, more than the single weight 70g of male shrimp, body length is more than 8cm, choose to concentrate after close shrimp and sterilize completely with 10 minutes prawn bodies of saline sook of 5%, then be evenly invested in pond along pond surrounding in male and female 2:1 ratio, throw in and select fine day 8:00 in the morning left and right of gentle breeze to throw in by 25 for every square metre, by shrimp body weight 3-5% feedstuff feeding, in per kilogram feed, add the each 20g of Ginseng Root Powder and Isatis Root to mix thoroughly and spread throwing, mid-April, female shrimp closed on oogenesis, decocted and was spilled into the 7-10 days that throws something and feeds after mixing evenly in feed after 4 hours with the bighead atractylodes rhizome, the root of large-flowered skullcap by the each 10g of per kilogram feed, young shrimp departs from after parent, add Ginseng Root Powder, the each 10g of allicin to throw something and feed 1 week after mixing thoroughly with granule manufactured feed per kilogram, per kilogram feed adds fishbone dust 30g simultaneously, and the tea cake that mixed feed has been thrown something and fed after rear 2-3 days every mu of water surface 8kg fragmentation soaks full pond after 12 hours and evenly spills, after the large quantities of decortications of juvenile prawn, in per kilogram feed, add again 30g fishbone dust, connect and throw 3 days, then by normally throwing something and feeding, overwinter management: temperature during lower than 5 DEG C 200 kilograms of throwings of every mu of thick sea salt of use be spread in water body.

Owing to having adopted technique scheme, reduce the incidence of disease, reduce lethality, seedling percent is high, is also convenient to long-distance transport, has improved cultivation efficiency.

Embodiment

Below in conjunction with example, the invention will be further described.

The transformation in pond: pond is changed into 20m wide, 300m, with the pond body of interior length, requires the good water nonpollution of native mud viscosity, irrigation and drainage are convenient, and Tu Chi is based upon hidding and sunny side place, is north-south, be convenient to solar radiation, improve cray parent shrimp and the required organic calcium of little son shrimp itself.The fine sand of the peace and quiet rear place mat 30cm-50cm of mud at the bottom of pond, being conducive to close shrimp juvenile prawn looks for food, at the bottom of pond drainage position to the upstream place of water inlet by sliding on 15 degree slope aspects, it is dark that deep water level will reach 1.8m, shallow water position keeps 30cm dark, suitably plant high bar tip aquatic plant at shoal and prevent birds harm, can not plant too close simultaneously, have influence on solar radiation, because the depth of water shallow great disparity in pond is larger, better growing environment is provided to close shrimp and juvenile prawn, the ridge, pond is wide more than 2.5m, and more than exceeding 80cm from maximum water level, so that selecting to adapt to position, close shrimp burrows, surrounding is by water level place plantation weeping willow, because weeping willow root system is many especially, and thin, can be born in water body, attachment is provided to the juvenile prawn that departs from parent, greatly improve juvenile prawn survival rate.Soil pond is narrow and grow, is convenient to evenly throw something and feed feed, thereby reduces close shrimp, and juvenile prawn strives the food phenomenon that struggles against.Before throwing seedling, water was injected to depths 1.8m left and right in 7-10 days, behind shallow water 30cm left and right, evenly splash in full pond after 12 hours with the broken tea cake immersion of 50kg for every mu, to the wild fishes in water body, swamp eel, loach and other biology that has life to endanger to cray kill, the protein of tea cake can play again regulating water quality in water body, cultivates the plankton in water body.The selection and culture of parent shrimp: selecting the complete healthy male and female shrimp of the four limbs appendage of age more than 10 months 3-4 month, ratio is 2:1, the single weight of female shrimp is more than 40g, more than the long 6cm of body, more than the single weight 70g of male shrimp, body length is more than 8cm, choose to concentrate after close shrimp and sterilize completely with 10 minutes prawn bodies of saline sook of 5%, then be evenly invested in pond along pond surrounding in male and female 2:1 ratio, throw in and select fine day 8:00 in the morning left and right of gentle breeze to throw in by 25 for every square metre, after throwing in, 2-3 days parent shrimps will be looked for food after substantially conforming in a large number, at this moment by shrimp body weight 3-5% feedstuff feeding, in per kilogram feed, add Ginseng Root Powder and the each 20g of Radix Isatidis powder end to mix thoroughly and spread throwing, owing to containing various trace elements in ginseng, can make frightened juvenile prawn tonifying primordial Qi, And builds up health.In Radix Isatidis, containing Multiple components such as amino acid, there is antibacterial, antiviral effect, reduced the probability of falling ill in shrimp seedling breeding process, for the healthy growth of cray lays a solid foundation.1 Zhou Houzai that stops using adds the 20g allicin 5-7 days that throws something and feeds in per kilogram feed, and allicin is a kind of broad spectrum antibiotic, for cray cultivation, can obviously strengthen shrimp seedling appetite, reduce the incidence of disease, reduce lethality, improve the growth rate of shrimp seedling.Mid-April, female shrimp closed on oogenesis, decoct and be spilled into the 7-10 days that throws something and feeds after mixing evenly in feed after 4 hours by the each 10g of per kilogram feed with the bighead atractylodes rhizome, the root of large-flowered skullcap, the bighead atractylodes rhizome is containing volatile oil, wherein be mainly the liquor-saturated material that waits of rhizoma atractylodis, there is antiabortive effect, thereby effectively improve the egg laying rate of red swamp of female shrimp, shift to an earlier date the female shrimp oogenesis phase, stimulate the sexual maturity of male shrimp, improve fertilized egg rate, laid hard constructional components for female shrimp lays eggs to the raising of juvenile prawn survival rate, the method only has 300 left and right to bring up to 450 left and right by original every female shrimp oogenesis, up to more than 500.At the beginning of 5 months by the end of April, water temperature is more than 20 DEG C time, parent shrimp starts mating, fertilized egg process in female shrimp abdomen 40-70 days is young shrimp, young shrimp one can be lived on one's own life after departing from parent, initiatively ingest, at this moment add Ginseng Root Powder with granule manufactured feed per kilogram, after mixing thoroughly, the each 10g of allicin throws something and feeds 1 week, per kilogram feed adds fishbone dust 30g simultaneously, supplement the required calcareous juvenile prawn decortication that contributes in close shrimp and juvenile prawn body, strengthen juvenile prawn physique, the tea cake that mixed feed has been thrown something and fed after rear 2-3 days every mu of water surface 8kg fragmentation soaks full pond after 12 hours and evenly spills, again effectively kill the wild fishes in water body, swamp eel, the natural enemy of the crays such as loach, avoiding juvenile prawn to be subject to life in decortication and life threatens, while can kill close shrimp and juvenile prawn is attached to external parasite, promotes the unified decortication of juvenile prawn, avoids the unsuccessful caused syndrome of juvenile prawn decortication.After the large quantities of decortications of juvenile prawn, add in per kilogram feed 30g fishbone dust again, connect and throw 3 days, supply juvenile prawn is calcareous again, accelerates juvenile prawn shell hardening speed, reduces the lethality of juvenile prawn in decortication process, then by normally throwing something and feeding.Overwinter management: enter autumn end, a large amount of close shrimps and juvenile prawn have entered cave, strengthen winter management preparation, temperature during lower than 5 DEG C 200 kilograms of throwings of every mu of thick sea salt of use be spread in water body, because every 100g sea salt contains abundant nutritive element, can make like this water temperature improve a lot, can make again close shrimp in water body, supplement various elements, strengthen close shrimp physique, reduce the lethality of close shrimp in During Overwintering Period, because the algae in winter water body is all not suitable with growth, so water quality can not worsen, change water after stopping to throw salt.

Every mu of water surface uses after this new technique scheme more than can produce seedling 450000 tails, increase than before 30%, survival rate is brought up to more than 90% by 60% original left and right, and the healthy vigor of 98% juvenile prawn is all improved largely, for later growing up healthy and sound of breeding process Prawn laid a good foundation, also be convenient to long-distance transport, reduced lethality in transit simultaneously.

  

Claims (1)

1. the method for a freshwater crayfish seedling propagation in scale, it is characterized in that pond transformation: pond is changed into 20m wide, 300m is with the pond body of interior length, the fine sand of the peace and quiet rear place mat 30cm-50cm of mud at the bottom of pond, at the bottom of pond drainage position to the upstream place of water inlet by sliding on 15 degree slope aspects, it is dark that deep water level will reach 1.8m, shallow water position keeps 30cm dark, and at the suitably high bar tip aquatic plant of plantation of shoal, the ridge, pond is wide more than 2.5m, and more than exceeding 80cm from maximum water level, surrounding is by water level place plantation weeping willow, throw seedling and water was injected to depths 1.8m left and right in first 7-10 days, behind shallow water 30cm left and right, evenly splash in full pond after 12 hours with the broken tea cake immersion of 50kg for every mu, the selection and culture of parent shrimp: selecting the complete healthy male and female shrimp of the four limbs appendage of age more than 10 months 3-4 month, ratio is 2:1, the single weight of female shrimp is more than 40g, more than the long 6cm of body, more than the single weight 70g of male shrimp, body length is more than 8cm, choose to concentrate after close shrimp and sterilize completely with 10 minutes prawn bodies of saline sook of 5%, then be evenly invested in pond along pond surrounding in male and female 2:1 ratio, throw in and select fine day 8:00 in the morning left and right of gentle breeze to throw in by 25 for every square metre, by shrimp body weight 3-5% feedstuff feeding, in per kilogram feed, add the each 20g of Ginseng Root Powder and Isatis Root to mix thoroughly and spread throwing, mid-April, female shrimp closed on oogenesis, decocted and was spilled into the 7-10 days that throws something and feeds after mixing evenly in feed after 4 hours with the bighead atractylodes rhizome, the root of large-flowered skullcap by the each 10g of per kilogram feed, young shrimp departs from after parent, add Ginseng Root Powder, the each 10g of allicin to throw something and feed 1 week after mixing thoroughly with granule manufactured feed per kilogram, per kilogram feed adds fishbone dust 30g simultaneously, and the tea cake that mixed feed has been thrown something and fed after rear 2-3 days every mu of water surface 8kg fragmentation soaks full pond after 12 hours and evenly spills, after the large quantities of decortications of juvenile prawn, in per kilogram feed, add again 30g fishbone dust, connect and throw 3 days, then by normally throwing something and feeding, overwinter management: temperature during lower than 5 DEG C 200 kilograms of throwings of every mu of thick sea salt of use be spread in water body.