77 results about "River prawn" patented technology

The invention provides a macrobrachium rosenbergii quality grading system based on machine vision. The macrobrachium rosenbergii quality grading system based on machine vision comprises a prawn body placing platform used for placing macrobrachium rosenbergii to be tested; the three-dimensional acquisition module comprises a structured light projection device, a binocular stereo camera and a flight time depth sensor; and the three-dimensional reconstruction module is used for constructing the data of the three-dimensional acquisition module into a complete three-dimensional point cloud model through a data fusion algorithm and a point cloud registration algorithm. According to the macrobrachium rosenbergii quality grading system based on machine vision, the overall scheme has robustness and expandability, the system is suitable for various large-scale farms and grading scenes, and the intelligent level of macrobrachium rosenbergii quality control is greatly improved.

The invention discloses a macrobrachium rosenbergii cherax ratio prediction and breeding method based on phenotypic omics analysis, which comprises the following steps: selecting a plurality of macrobrachium rosenbergii for multi-generation breeding, recording pedigree data of each individual, and constructing a macrobrachium rosenbergii breeding database; the method comprises the following steps: extracting phenotypic characteristics of macrobrachium at different culture stages, analyzing a rule between a growth index and a chelate ratio, carrying out heritability evaluation, and constructing a macrobrachium phenotypic omics network; the growth path of macrobrachium rosenbergii is analyzed, abnormal events in the breeding period are recognized, and a macrobrachium rosenbergii growth situation network is generated; constructing a macrobrachium phenotype knowledge map, and constructing a macrobrachium cherax ratio prediction model; and performing data acquisition on a macrobrachium rosenbergii population to be bred to obtain early phenotypic data, performing breeding decision, and performing breeding path recommendation on bred individuals by using the macrobrachium rosenbergii phenotypic knowledge graph. Meanwhile, whether the breeding path is deviated or not in the breeding process is analyzed, and a correction scheme is formulated for pushing, so that the breeding period of the macrobrachium is shortened, and the breeding accuracy and efficiency are improved.

The invention relates to the technical field of phenotype measurement in aquatic genetic breeding, in particular to a macrobrachium rosenbergii small-size shrimp high-throughput phenotype measurement method and measurement system. According to the method, a camera obscura environment is constructed through a white shooting bottom plate, a dark extinction inner wall and an LED area array light source in a measuring box body, and illumination is adaptively adjusted by combining rough segmentation of a preview and analysis of a local gray histogram, so that stable bimodal gray distribution is formed between a shrimp body and a background. On the basis, a segmentation-key point combined deep learning model is adopted, a shrimp body mask and a standard key point are output at the same time, topological consistency loss constraints of a framework side length proportion and an included angle are introduced in training, and key point mismarking and drifting caused by the transparent body color are remarkably reduced. According to the method, rapid, non-contact, high-precision and high-throughput measurement of macrobrachium rosenbergii small-specification individual phenotype parameters and weight is realized, and a high-quality structured phenotype database is provided for genetic evaluation and multi-character combined selection.

The invention discloses a macrobrachium rosenbergii probiotic biofloc technology (BFT) culture system construction method based on an SBOS-FOS composite carbon source, and belongs to the technical field of aquaculture. The total ratio of SBOS (soybean oligosaccharide) and FOS (fructo-oligosaccharide) in the composite carbon source is 2%-10%, and the balance is glucose; and adding the composite carbon source into a macrobrachium rosenbergii culture system according to the C / N ratio of (10: 1)-(20: 1) according to the feed protein content in the culture water body. Through a specific ratio of SBOS to FOS, the content of functional probiotics in a culture water body is specifically increased, stable control of ammonia nitrogen and nitrite nitrogen and directional optimization of a carbon source-flora-host three-level regulation and control network in a BFT system are realized, the weight gain rate (WG), the specific growth rate (SGR) and digestive enzyme activity (trypsin and amylase) of macrobrachium rosenbergii are increased, and the survival rate of the macrobrachium rosenbergii is increased. The abundance of probiotics in the water body and the immune gene expression of the macrobrachium rosenbergii are obviously improved.

The application discloses a kind of high-activity mysis of macrobrachium rosenbergii screening method, belong to aquaculture technical field.The method includes: pre-treatment of immersion washing, using 100 mesh nylon net to catch I stage mysis, stirring treatment in the first immersion washing container containing 100ppm formaldehyde and 6 ‰ brackish water;First light source induction screening, using 580-595nm, 1500-2000lux LED light source induction above second immersion washing container, and high-activity I stage larvae that float up are collected in batches;Disinfection treatment, after soaking with 20-30ppm povidone iodine, rinse;Again light source induction screening, after the larvae are developed into II stage after constant temperature cultivation at 28-30 DEG C for 24 hours, again light source induction is carried out and high-activity II stage larvae that float up are collected in batches;Finally, concentrated cultivation is carried out.The application realizes the high-efficiency, standardization sorting of high-activity mysis by the combination of specific wavelength light source induction and twice screening before and after key development period, and optimizes immersion washing, disinfection and cultivation parameters, significantly improves the quality of seedling and the survival rate of seedling.

The present application belongs to the field of aquaculture, and particularly relates to a large-specification red paste Macrobrachium rosenbergii breeding method, which comprises the following steps: S1, seedling marking: seedlings are raised in a greenhouse, a pond, an adjustable feed throwing device and a networked automatic feed checking table are arranged in the greenhouse; the feed feeding amount of the adjustable feed throwing device is adjusted through feedback of the networked automatic feed checking table; water quality is adjusted by using micro-ecological preparation and bottom modification preparation; S2, initial screening of male and female: when the marking time is 45-50 days and the average specification reaches 1800-2000 tails / kg, initial screening of male and female is performed to reduce the density of the Macrobrachium rosenbergii in the greenhouse; S3, outdoor pond raising; S4, red paste fattening: female Macrobrachium rosenbergii are fattened with red paste, nutrition fattening feed is fed on Monday, Wednesday and Friday every week, snail meat, carrots and corn are used to replace part of the feed in turn, the replacement proportion is about 50%-60%, normal feed is fed at other times, the fattening period is 4-6 weeks, and the Macrobrachium rosenbergii are caught in late September to early October.

The invention relates to the technical field of pomacea canaliculata resourceful treatment and aquaculture, in particular to a macrobrachium rosenbergii breeding method based on pomacea canaliculata resourceful treatment. The method comprises the following steps: sequentially carrying out multi-stage purification on captured ampullaria gigas through temporary culture emptying, circulating micro-flowing water washing and EM bacterial liquid soaking, then integrally crushing the ampullaria gigas into ampullaria gigas meat paste, adding table salt and / or organic acid, and then mixing the ampullaria gigas meat paste with a vitamin-rich plant raw material and a vitamin mineral premix according to a ratio; and the soft pomacea canaliculata block bait which is not easy to foam and scatter is formed by extrusion or compression molding in cooperation with a hydrophilic gel binder. In a breeding pond of the macrobrachium rosenbergii, the soft block bait is matched with compound feed for the parent macrobrachium rosenbergii for precise feeding according to a limited proportion and a limited period of time, and the feeding amount and water change are dynamically adjusted in combination with water quality indexes, so that the gonad development and reproductive performance of the macrobrachium rosenbergii are improved, the water quality is stabilized, and the bait cost is reduced.

The present application belongs to the field of aquaculture, and particularly relates to a feeding supervision method for Macrobrachium rosenbergii. The feeding supervision system is characterized by comprising an adjustable feed throwing device and a networked automatic feed checking table. The adjustable feed throwing device comprises a feed throwing box, a wind feeding mechanism and a suspended throwing mechanism. The networked automatic feed checking table is arranged at the suspended throwing mechanism and comprises a lifting mechanism, a feed checking table, a weighing mechanism, a shooting mechanism, a networked module and a water quality detection net.

The invention discloses a compound probiotic preparation for breeding macrobrachium rosenbergii as well as a preparation method and application of the compound probiotic preparation, and relates to the technical field of microorganisms, the compound probiotic preparation comprises the following active strains: Lactococcus gasseri, Bacillus subtilis and Nitrobacter winogradski, and the compound probiotic preparation comprises the following active strains: Lactococcus gasseri, Bacillus subtilis and Nitrobacter winogradski, and the compound probiotic preparation comprises the following active strains: Lactococcus gasseri, Bacillus subtilis and Nitrobacter winogradski. Wherein the preservation number of the lactococcus format is CGMCC (China General Microbiological Culture Collection Center) No.31024. According to the physiological requirements of different development stages of the Z1-Z4 stage and the Z5-P1 stage of larvae, 2: 1 and 2: 1: 1 bacterial strains are adopted for staged accurate addition respectively, meanwhile, artificial seawater of a specific formula is matched, baits such as fairy shrimps and egg custard are quantitatively fed according to the development stage, key water quality indexes such as dissolved oxygen, ammonia nitrogen and nitrite in a water body are strictly regulated and controlled, and the quality of the larvae is improved. A green seedling raising technical system integrating probiotic micro-ecological regulation and control, precise nutrition supply and water quality management is formed, and finally the effects of improving the survival rate of larvae, reducing the metamorphosis rate, promoting growth and development and replacing antibiotics for use are achieved.

The utility model provides a grading screen for breeding macrobrachium rosenbergii larvae, which comprises a base, an arch-shaped mounting frame is fixedly mounted at the top of the base, a grading screening mechanism for the macrobrachium rosenbergii larvae is arranged on the inner side of the arch-shaped mounting frame, a water collecting tank is fixedly mounted at the top of the base, and a collecting tank is arranged at the top of the water collecting tank. And the macrobrachium rosenbergii larva grading screening mechanism comprises three screening grooves which are vertically placed, nylon filter screens are fixedly installed at the bottoms of the screening grooves, inserting grooves are formed in the right sides of the screening grooves, baffles are arranged in the inserting grooves in a penetrating and inserting mode, and two circular connecting rings are fixedly installed on the inner side of an arch-shaped installation frame. The base is arranged to achieve installation of the water collecting tank, the water collecting tank is arranged to collect and discharge water, and the macrobrachium rosenbergii larva grading screening mechanism is arranged to achieve grading filtering of macrobrachium rosenbergii larva. Further, larvae of macrobrachium rosenbergii with different sizes are separated, so that the survival rate during subsequent culture can be increased.

This invention discloses a method for co-culturing giant freshwater prawns (Macrobrachium rosenbergii) with shrimp, grass, and fish based on probiotic regulation, and its application. This invention constructs a three-dimensional ecological system with shrimp as the main body, grass as the protector, and fish as a supplement. Elodea and water spinach purify the water, silver carp and crucian carp decompose uneaten feed and feces, and a compound microbial preparation of Lactococcus gasseri C6a2 regulates water quality, while a biological bottom conditioner improves the bottom sediment, achieving precise ecological regulation of the aquaculture environment. This invention does not rely on chemical agents, effectively inhibits ammonia nitrogen accumulation, reduces disease incidence, and significantly improves the survival rate and size of giant freshwater prawns, achieving a win-win situation for both ecological and economic benefits.

The present application belongs to the field of biotechnology and genomics, and particularly relates to a method and system for determining the chromosome base number of Macrobrachium rosenbergii based on multi-omics joint analysis. The method obtains de novo assembly sequencing data and Hi-C sequencing data, generates a chromosome-level candidate assembly without presetting the number of chromosomes by using Hi-C interaction signals after primary assembly, and performs whole-genome collinearity alignment with no less than two published reference genomes; in combination with quality constraints such as collinearity continuity, Hi-C boundary characteristics and BUSCO / LAI, the candidate chromosome boundary is comprehensively judged and iteratively converged, and finally the chromosome base number and reviewable evidence chain are output. The embodiments show that the present application can identify and correct the number redundancy caused by over-splitting of the reference genome, determine the base number of Macrobrachium rosenbergii as n=57 (2n=114), and improve the objectivity and reliability of base number determination.

The invention discloses a macrobrachium rosenbergii freezing preservative as well as a use method and application thereof, and belongs to the technical field of shrimp preservatives. According to the macrobrachium rosenbergii freezing preservative provided by the invention, all the components have no potential safety hazard to human health and ecological environment; the macrobrachium rosenbergii freezing fresh-keeping agent is prepared by creatively utilizing daily seasonings and oligopeptides in cells as effective components, tests prove that the prepared fresh-keeping agent is combined with a specific using method, the fresh-keeping effect on the macrobrachium rosenbergii is very excellent, no obvious cellular content flows out after the macrobrachium rosenbergii is frozen at-20 DEG C for 6 months, the boiling quality is relatively good, and the macrobrachium rosenbergii freezing fresh-keeping agent is suitable for large-scale popularization and application. The shrimp is bright in color, rich in shrimp flavor, good in meat plumpness, appropriate in fiber compactness and hardness and free of obvious salty taste; the provided macrobrachium rosenbergii freezing fresh-keeping agent is simple in preparation method, easy to operate, wide in raw material source, high in cost performance and suitable for freezing fresh-keeping of macrobrachium rosenbergii.

The invention belongs to the field of biotechnology and genomics, and particularly relates to a method and system for determining the chromosome cardinal number of macrobrachium rosenbergii based on multi-omics conjoint analysis. According to the method, de novo assembly sequencing data and Hi-C sequencing data are obtained, after primary assembly is completed, chromosome-level candidate assemblies are generated under the condition that the number of chromosomes is not preset through Hi-C interaction signals, and whole-genome collinearity comparison is carried out on the chromosome-level candidate assemblies and no less than two disclosed reference genomes; and in combination with quality constraints such as collinearity continuity, Hi-C boundary features and BUSCO / LAI, carrying out comprehensive decision and iterative convergence on candidate chromosome boundaries, and finally outputting chromosome cardinal numbers and reviewable evidence chains. The embodiment of the invention shows that the method can identify and correct the number redundancy caused by the over-resolution of the reference genome, determines the cardinal number of macrobrachium rosenbergii as n = 57 (2n = 114), and improves the objectivity and reliability of cardinal number determination.

The present application relates to the technical field of phenotype measurement in aquatic genetic breeding, and particularly relates to a high-throughput phenotype measurement method and system for small-sized Macrobrachium rosenbergii. In the measurement box, a dark box environment is constructed by a white shooting bottom plate, dark light-absorbing inner walls and an LED surface array light source, combined with preview graph rough segmentation and local gray histogram analysis, to adaptively adjust the light to make the shrimp body and the background form a stable bimodal gray distribution. On this basis, a segmentation-key point joint deep learning model is used to simultaneously output the shrimp body mask and standard key points, and the topological consistency loss constraint of the skeleton side length ratio and the included angle is introduced in the training to significantly reduce the key point mislabeling and drift caused by transparent body color. The present application realizes the rapid, non-contact, high-precision and high-throughput determination of the phenotype parameters and weight of small-sized Macrobrachium rosenbergii individuals, and provides a high-quality structured phenotype database for genetic evaluation and multi-trait joint selection.

The application discloses a method for predicting and breeding Macrobrachium rosenbergii chela ratio based on phenomics analysis, comprising the following steps: selecting a plurality of Macrobrachium rosenbergii for multi-generation breeding, recording pedigree data of each individual, and constructing a Macrobrachium rosenbergii breeding database; extracting the phenotypic characteristics of Macrobrachium rosenbergii at different breeding stages, analyzing the relationship between the growth index and the chela ratio, and evaluating the genetic force to construct a Macrobrachium rosenbergii phenomics network; analyzing the growth path of Macrobrachium rosenbergii, identifying abnormal events during breeding, and generating a Macrobrachium rosenbergii growth trend network; constructing a Macrobrachium rosenbergii phenotype knowledge graph, and constructing a Macrobrachium rosenbergii chela ratio prediction model; collecting early phenotype data of the Macrobrachium rosenbergii population to be bred, making breeding decisions, and recommending breeding paths for the breeding individuals by using the Macrobrachium rosenbergii phenotype knowledge graph. Whether the breeding path is deviated in the breeding process is analyzed at the same time, and a correction scheme is formulated and pushed, so that the breeding cycle of Macrobrachium rosenbergii is shortened, and the accuracy and efficiency of breeding are improved.

The invention discloses a macrobrachium rosenbergii fry breeding method based on concentrated natural seawater, and relates to the technical field of aquaculture breeding, and the method comprises the following steps: S1, selecting surface seawater of a sea area of the northern bay of Guangxi, and sequentially carrying out pretreatment, concentration treatment and retreatment to obtain concentrated seawater; the pretreatment comprises precipitation, precise filtration and sterilization; the concentration treatment adopts a reverse osmosis method or is combined with a double-effect evaporation method, and the seawater is concentrated to 1 / 3-1 / 5 of the original volume; the retreatment comprises the following steps: adjusting the pH value to 7.8-8.2, adding an EDTA-2Na chelating agent, and carrying out precise filtration; s2, performing differential precipitation, three-stage gradient filtration and compatibility pre-detection on the selected water source to ensure that the turbidity of dilution water is less than or equal to 3NTU, the pH is 7.5-8.0, the ammonia nitrogen is less than or equal to 0.02 mg / L, and the residual chlorine is equal to 0mg / L. According to the method, through whole-course water quality management and staged accurate feeding, efficient, stable and green breeding from larvae to juvenile shrimps is achieved.

The invention relates to the field of material science and engineering, and particularly discloses a screening method of an anti-macrobrachium rosenbergii iridovirus natural compound based on an MCP protein target. The method comprises the following steps: constructing a three-dimensional structure of a virus major capsid protein MCP and determining an active pocket; performing structure pretreatment on the natural compound library; by taking the active pocket as a target spot, performing multiple rounds of virtual screening through molecular docking to obtain a candidate compound with binding energy less than or equal to-10.0 kcal / mol; and establishing a macrobrachium rosenbergii artificial infection model, determining the virus inhibition rate and protection rate of the candidate compound, and screening the active compound. The eugenol, the amentoflavone, the polyphyllin II and the solamargine screened by the method show a remarkable antiviral effect in an in-vivo injection test and breeding verification. According to the method, accurate screening from target spot prediction to in-vivo verification is realized.

The invention relates to the field of aquaculture, in particular to a macrobrachium rosenbergii breeding method based on compound fruit enzyme, which comprises the following steps: S1, preparing the compound fruit enzyme as an additive of traditional shrimp feed; s2, the macrobrachium rosenbergii is subjected to experimental breeding by using different compound fruit enzyme addition proportions, a test sample is obtained, and the mass proportion range of the compound fruit enzyme to the traditional shrimp feed is 0.5%-5%; s3, establishing a mathematical model, taking the contents of calcium, iron, EPA and DHA in shrimp meat in the adult macrobrachium rosenbergii, the weight of the macrobrachium rosenbergii and the elasticity of the macrobrachium rosenbergii as evaluation indexes, and determining a mathematical relationship between the optimal ratio of the compound fruit enzyme additive to the traditional shrimp feed and the evaluation indexes in combination with experimental sample data; s4, calculating the adding ratio of the optimal compound fruit enzyme additive to the traditional shrimp feed; and S5, feeding the macrobrachium rosenbergii by using feed with an improved ratio.

The invention discloses an ecological rice planting method for crop rotation of crayfish and macrobrachium rosenbergii, and belongs to the technical field of agricultural production. The invention solves the problem of how to further improve the effect of rice-shrimp co-culture and fully exert the advantages in the prior art. The method comprises the following steps: S1, planting rice in a rice field from April to May every year; s2, after rice tillering and the water temperature is constant to 22 DEG C or above, macrobrachium rosenbergii seeds are put in; s3, starting to catch macrobrachium rosenbergii from August to September every year; s4, harvesting the rice; s5, planting aquatic plants; s6, putting young crayfish in October; and S7, catching the crayfishes in March of the next year, and then repeating the steps S1-S7. According to the method, on the basis of original one-season rice and one-season shrimps, one-season shrimp breeding is added, and the unit output value and benefits of the rice field are increased. By reasonably regulating and controlling the cultivation time of the macrobrachium rosenbergii, the crayfish and the rice, the marketing time of the macrobrachium rosenbergii and the crayfish is advanced by one month, the economic value of the rice field is fully volatilized, and the produced economic value is higher.

The invention discloses a dsRNA interference sequence combination as well as a preparation method and application thereof, and belongs to the technical field of physiological regulation of aquatic animals. According to gene sequence information, appropriate interference sites are selected to design and synthesize dsRNA, the synthesized dsRNA is injected into the body of the macrobrachium rosenbergii for RNA interference, the weight increase and ecdysis frequency indexes of the macrobrachium rosenbergii before and after RNA interference treatment are analyzed, and results show that compared with blank control and dsGFP interference groups, the use of the MIHa dsRNA has obvious advantages, such as the use of the MIHa dsRNA, the use of the MIHa dsRNA has obvious advantages, and the use of the MIHa dsRNA has obvious application prospects in the field of macrobrachium rosenbergii. Compared with the prior art, the method provided by the invention has the advantages that the transcription level of the MIHa gene is reduced through the RNA interference technology, and the inhibition effect of the MIHa gene on the growth ecdysis can be reduced to a certain extent, so that the growth rate of the macrobrachium rosenbergii is improved.

This invention belongs to the field of feed additive technology. It discloses a method for preparing an antibacterial feed additive for giant freshwater prawns and its application. The invention provides a feed additive containing a probiotic complex, a mineral-essential oil complex, an immune-enhancing complex, and compound trace elements. This feed additive achieves highly efficient inhibition of pathogens such as parahemolytic bacteria through a four-pronged mechanism of action: probiotics inhibit bacterial growth, plant-derived components synergistically kill bacteria, minerals adsorb toxins, and trace elements enhance immunity and the intestinal barrier. This significantly reduces the incidence and mortality of bacterial diseases in giant freshwater prawns. Furthermore, this invention solves the technical problem of the difficulty in coexisting probiotics and plant essential oils in existing technologies, exhibiting significant synergistic effects, good stability, and green safety, making it suitable for the entire process of giant freshwater prawn farming.

The utility model relates to the technical field of bait separation, and discloses a macrobrachium rosenbergii larva bait separator which comprises a processing box, a bait feeding device and a bait feeding device. The feeding hole is formed in the top of the treatment box; the collecting bin is clamped on the inner surface of the treatment box; and an operation assembly is fixedly connected into the treatment box. According to the macrobrachium rosenbergii larva bait separator, a motor is started to operate to drive a first transmission shaft to rotate through a rotating rod, the first transmission shaft is in transmission connection with a second transmission shaft through a transmission belt to rotate, the second transmission shaft drives a shaft rod to rotate, and the shaft rod drives a transmission rod to rotate and repeatedly abut against the bottom of a transmission hanging plate, so that the transmission hanging plate slides up and down on the outer wall of a fixing rod; the first separation frame, the second separation frame and the third separation frame are driven to vibrate through the vibration of the motor, so that screen holes of the first separation frame, the second separation frame and the third separation frame are prevented from being blocked, the separation speed is increased, the first separation frame, the second separation frame and the third separation frame are limited in ascending and assisted in resetting through elastic resistance belts, and descending buffering is achieved through supporting springs.

The present invention provides a primer set and method for analyzing the nanos1 gene of Macrobrachium rosenbergii, relating to the biotechnology field of reproductive-related genes in Macrobrachium rosenbergii. The Nanos1 gene obtained by the present invention has a cDNA sequence of 2811 base pairs (bp) long, encoding 243 amino acids. Nanos1 is specifically expressed in the ovary, and the expression level of nanso1 mRNA is highest in unfertilized eggs, significantly higher than after fertilization and at all stages of embryonic development. During embryonic development, expression is highest during fertilization, significantly higher than during the cleavage stage and extremely significantly higher than during the late embryonic development stage. The gene's expression level during the cleavage stage is significantly higher than from the blastocyst stage to the larvae stage; however, the expression level is lower and does not differ between the blastocyst stage and the larvae stage. Nanos1 mRNA is expressed in the cytoplasm of oogonia and primary oocytes (Oc1, Oc2, Oc3, and Oc4). Nanos1 is closely related to the development of female germ cells in Macrobrachium rosenbergii and plays an important role in the reproductive development of Macrobrachium rosenbergii, providing a theoretical basis and ideas for research on reproductive development and sex identification in Macrobrachium rosenbergii.

The present invention relates to the technical field of sewage filtration equipment, and discloses a water purification device for a Macrobrachium rosenbergii breeding pond, comprising a shell, a drum, the drum being rotatably connected to the inner wall of the shell, a water inlet pipe being provided at the bottom of the shell, a plurality of grooves being provided around the inner wall of the drum, a filter belt being provided on the inner wall of the groove, and a plurality of filter baffles being hinged around the outer wall of the filter belt. The present invention is provided with a drum inside, a plurality of filter belts being provided around the inner wall of the drum, the drum will rotate on the inner wall of the shell, the rotating drum will use centrifugal force to swing the pool water to form a vortex, the vortex pool water will continuously impact the filter belt and the filter baffle, the filter baffle will use its transmission to filter out the sludge, leftover bait and feces in the pool water, and the sludge, leftover bait and feces in the pool water can be effectively filtered under the continuous centrifugal swinging of the drum.

The invention relates to the technical field of aquatic product breeding, in particular to a macrobrachium rosenbergii total egg carrying amount prediction model and a construction method and application thereof. According to the method, multiple oviposition tracking is carried out on female macrobrachium rosenbergii individuals, growth characters and reproduction indexes of the female macrobrachium rosenbergii individuals under different oviposition times are collected, correlation analysis, drift diameter analysis and multiple regression modeling are combined, and the growth and reproduction performance change rule of the female macrobrachium rosenbergii after multiple oviposition is systematically evaluated. Results show that the body length, the weight and the reproductive performance of macrobrachium rosenbergii are all remarkably improved in the first three times of spawning, the total egg weight is the key character influencing the total egg carrying amount, and the total egg carrying amount is indirectly influenced by the weight, the abdominal length and the abdominal width by influencing the total egg weight. A theoretical basis and a quantitative model are provided for screening and breeding of macrobrachium rosenbergii high-reproductive-capacity parents, and the method has the advantages of being easy and convenient to operate, high in applicability and high in selection efficiency and is widely applied to technical scenes such as freshwater shrimp seed shrimp breeding, germplasm improvement and breeding management.

The invention belongs to the technical field of rice field aquaculture, and particularly relates to a rice-macrobrachium rosenbergii co-cropping nitrogenous fertilizer application reducing and efficiency improving planting and breeding method. The method comprises the steps that S1, nitrogenous fertilizer application reduction treatment is conducted on the rice field, specifically, nitrogenous fertilizer urea obtained after application reduction is completely applied to 0-15 cm of plough layer soil of the rice field, and the nitrogenous fertilizer amount obtained after application reduction is 40%-80% of the nitrogenous fertilizer amount before application reduction; step S2, transplanting rice seedlings: sowing and raising rice seedlings in the first ten days of May every year, and transplanting the rice seedlings to the rice field after the rice seedling age reaches 25-30 days; 3, macrobrachium rosenbergii is put, wherein macrobrachium rosenbergii seeds are put in the morning of a sunny day in the rice sealing period according to the density of 4.5-90 thousand / hm < 2 > for breeding; s4, harvesting: harvesting adult macrobrachium rosenbergii for sale when the water temperature of the rice field is lower than 20 DEG C, and harvesting rice when the rice is mature. By the adoption of the rice-macrobrachium rosenbergii co-cropping mode, nitrogen fertilizer application is properly reduced in the planting and breeding process, the yield of rice can be guaranteed, meanwhile, the yield of macrobrachium rosenbergii is remarkably increased, and therefore the optimal economic benefits are achieved.

The application discloses a bait feeding device for breeding of Macrobrachium rosenbergii, which comprises a storage bin, a scattering bin, a feeding part and a discharging part. The scattering bin is provided with a plurality of scattering ports with different heights. The discharging part is arranged at the bottom of the storage bin and is suitable for quantitative discharging into the scattering bin. The feeding part is suitable for power conveying of the material into the scattering bin, so that the material is scattered out of the scattering bin at different scattering ports. According to the height of the scattering port, the feeding part makes the bait have a certain initial speed when leaving the scattering bin. In the case that the heights of the scattering ports are different, the bait can be scattered in a larger range each time, and the scattering range of the bait after each scattering is increased.

1. Name of the product in this design: Packaging Box (Macrobrachium rosenbergii). 2. Intended use of this design: Frozen shrimp packaging box. 3. The key design features of this product are: the design of the main view pattern. 4. The image or photograph that best illustrates the design's key features: the front view. 5. Other situations requiring explanation: The rear view is the same as the front view, so the rear view is omitted; the right view is the same as the left view, so the right view is omitted.