284 results about "Metamorphosis" patented technology

The present invention is technological process and apparatus of culturing triploid solitary oyster on the basis of tetraploid oyster parent. The technological process includes breeding parent oyster, obtaining egg and generating triploid, larva culturing, no-adhesion metamorphosis, downward flow culturing, upward flow culturing, outdoor temporary culturing, raft type pruning in intertidal zone and commercial oyster purifying. The present invention combines the triploid technology and solitary oyster culturing technology to breed new oyster variety for large scale production. The triploid solitary oyster has great size, high saccharide content, high quality, good taste, and thus high marketability.

The invention relates to the technical field of the breeding of shellfish seedlings, in particular to an artificial breeding method for Mactra chinensis. Through the combination of artificial ripening and ecological ripening of parents, the development of sex glands is regularly detected to determine the mature period of the sex glands of the parents; methods such as shade drying, water flowing and so on, are adopted to stimulate the spawning and spermiation of the parents to obtain fertilized eggs, and D larvae are obtained through the embryonic development; and on this basis, larva breeding, larva metamorphosis and juvenile shellfish cultivation are performed. A large amount of Mactra chinensis seedlings can be obtained through the links. The method breaks through an artificial breeding technology of the Mactra chinensis, solves the problem of the breeding of the Mactra chinensis seedlings that fails to be broken through for a long time, and lays a solid foundation for the development of cultivation and proliferation of native species, the resource recovery of shallow seas and tidal-flat areas, and the maintenance of biological diversity. The method has the characteristics of simple and convenient operation and high practicality.

A controllable mechanism type loading machine with the active metamorphic function comprises a machine frame, a bucket turnover mechanism, a big arm lifting mechanism and a locking device. The big arm lifting mechanism comprises a big arm and a lifting mechanism. The bucket turnover mechanism comprises a bucket and a turnover mechanism. The locking device is installed on a rotation pair, and the active metamorphic function is achieved by locking the rotation pair. A novel connecting rod transmission mechanism replaces a traditional hydraulic transmission mode, and the shortcomings that a hydraulic system of a hydraulic loading machine is complex, oil leakage occurs easily and the requirement for machining accuracy is high are overcome. As the locking device is arranged on the rotation pair, active metamorphosis can be achieved according to different operating conditions. The controllable mechanism type loading machine not only has the flexibility of a novel connecting rod loading machine, but also can achieve the loading operations of two degrees of freedom by the utilization of one driving rod, the number of motors used on the machine is decreased, the manufacturing price of the loading machine is lowered, and the controllable mechanism type loading machine is applicable to manufacturing various loading machines and other engineering machines.

The invention relates to a treatment method of middle-late stage attaching bases in shellfish seedling breeding, in particular to a method for treating the attaching bases (mesh sheets, red palm ropesand the like) of shellfish (scallops, mussels, arca inflata reeves and the like) by using the benthic diatom film method, thereby greatly improving the larval attaching rate and the metamorphosis rate. The method has convenient operation and can treat a large number of attaching bases. The treatment method and the attaching bases after treatment have no pollution and are safe and environment-friendly; more importantly, the seedling attaching effect is significantly better than the attaching bases treated by using the traditional method.

The invention relates to a manual grow seedlings method of Rapana venosa spat, which is characterized by comprising the following steps: firstly selecting parent Rapana venosa; feeding the parent Rapana venosa, changing water, cleaning up the bottom, continuously aerating and keeping the environment dark every day; mating the Rapana venosa 5-6 days later, and removing the parent Rapana venosa after enough oocysts are produced; then hatching the oocysts at a water temperature of 22-24 DEG C for 18-22 days under veliger larvae come out, selecting better ones, and breeding in a pond at a density of 0.3-0.5 per milliliter; changing water and feeding the veliger larvae every day; after 18-20 days, placing the veliger larvae on a polyethylene corrugated plate and a polyethylene collector bag attaching base at a water temperature of 22-24 DEG C; and finally, moving the attached young Rapana venosa having 3-4 whorls after metamorphosis into a purse net of an outdoor pond or a floating net cage, or moving into a floating net cage arranged on the sea, and stripping the Rapana venosa for aquaculture after the Rapana venosa grows to 5mm. The invention solves the problem of low spat survival rate in the indoor manual spat breeding, lowers the production cost and is environment friendly. Besides, the produced spat are robust and grow fast.

The present invention relates to marine microbe applying technology and sea cucumber cultivating technology, and is especially process of producing marine rhodotorula mucilaginosa for sea cucumber. The conventional marine rhodotorula mucilaginosa is cultured in aged sea water with glucose in 1.0-3.8 wt% and EDTA-Fe in 1-3 ml / l at 15-25 deg.c, and the production process includes two stages of fermentation, centrifugal concentration and other steps. The production is simple, short in production period and low in cost, and the marine rhodotorula mucilaginosa product has high quality. The produced marine rhodotorula mucilaginosa is applied in raising sea cucumber larva to raise the metamorphosis rate and survival rate of sea cucumber larva, promote the growth of the larva and improve the ecological environment in the culture pond.

The invention relates to the field of aquaculture, in particular to a rana spinosa breeding method, which comprises seed selection, spawning, maintaining of tadpole and breeding of froglets and adult frogs. The breeding of froglets and adult frogs comprises construction of breeding ponds, feeding of baits, daily management and regular epidemic prevention. A froglet breeding pond and an adult frog breeding pond are constructed for respective breeding management of the froglets and the adult frogs; feeding is performed with the fixed time, fixed location, fixed quantity and fixed quality to ensure comprehensive nutrients and rapid growth of frogs and reduce diseases of the frogs; an insulation device is set in each breeding pond to increase the temperature of water in the ponds so that frogs can continuously move and eat food without winter sleep, growth of the frogs can be accelerated, and the breeding cycle can be shortened; and the regular epidemic prevention is performed for the breeding ponds with traditional Chinese medicine and disinfectants to prevent diseases of the frogs. By adopting the breeding method, better economic benefits can be achieved, the spawning rate of female frogs is 91.7 percent, the egg fertilization rate is 93 percent, the hatching rate is 96.6 percent, the tadpole metamorphosis rate is 88.4 percent, the froglet survival rate is 90.3 percent, and the survival rate of adult frogs is 93.9 percent after breeding.

A giant spiny frog ecological breeding method includes the following steps of water conditioning, breeding frog breeding, breeding frog oviposition, frogspawn hatching, tadpole breeding, tadpole metamorphosis, froglet breeding and adult frog raising, so that adult frogs are obtained. The giant spiny frog ecological breeding method has the advantages that giant spiny frogs grow rapidly and healthily, are robust and reach the growth level and final quality of wild giant spiny frogs, the growth survival rate of giant spiny frogs is increased, influences caused by diseases on growth of giant spiny frogs are reduced by the adoption of disease prevention measures, the survival rate and quality of giant spiny frogs are improved, giant spiny frogs have high survivability and disease resistance, giant spiny frogs grow healthily and robustly by the adoption of a nutrition equilibrium mode during raising, produced giant spiny frogs have a short growth cycle under the ecological breeding environment and have good output quality, market supply can be increased by produced giant spiny frogs, market prospects are wide, and popularization of giant spiny frog breeding in Longquan mountain and forest regions is facilitated.

The invention discloses a turbot fry starter feed formula comprising the composition and content by the mass percentage: 20-35% of white fish meal, 10-20% of a chicken powder, 3-6% of an egg powder, 3-6% of beer yeast, 10-20% of wet brine shrimp, 5-10% of shrimp flesh, 15-20% of flour, 1-3% of betaine, 1-5% of fish oil, 1-3% of phospholipid, 1-2% of a vitamin mixture, 2-4% of a mineral element mixture, and 1-5% of a microorganism preparation. The turbot fry starter feed formula has the advantages of high raw material digestion and absorption utilization rate, strong feeding attraction, safety and reliability, stable quality, health, comprehensive nutrition, and convenience in use, can promote the fry metamorphosis development, improves growth performance, and improves the disease-resistant and anti-stress abilities of fry, increases the survival rate, and is suitable for large-scale cultivation of the turbot fry.

The invention relates to the method for Pinna pectinate autumn offspring breeding and pruning, which comprises, selecting August to September for offspring breeding, choosing the eligible parent shellfish, after 10-15 days, regulating the parent shellfish sex gland to synchronous ripening, carrying out oviposition and fertilization, and carrying out scallop larva incubation, after 13-18 days, adhering the larva to juvenile mollusk through metamorphosis, cultivating the juvenile mollusk temporarily for 10-15 days, then carrying out seedlings protectoin on the sea, breeding on the sea in November, and harvesting during September to November in the next year till the July of the third year.

The invention discloses a method for artificial breeding of reef-dwelling young holothuria leucospilota in a small water body. According to the method, through bait and water quality management in keystages such as the pelagic stage, the metamorphosis settlement stage and the young holothuria leucospilota stage, artificial breeding of young holothuria leucospilota is achieved, artificial reproduction and releasing of holothuria leucospilota are made possible, the restoration of the marine benthic ecological environment of the South China Sea is facilitated, and basic conditions are provided for further development and utilization of biological resources of holothuria leucospilota.

The invention relates to a phenylpropanoid glycosides composition extracted from traditional tibetan medicine incarvillea younghusnandii and a preparation method, comprising an incarvillea younghusnandii phenylpropanoid glycosides compound A and an incarvillea younghusnandii phenylpropanoid glycosides compound B, wherein, the weight ratio of the compound A and the compound B is 60 to 90 : 40 to 10; and the total content of two compounds is 70% to 100% of the total weight of the phenylpropanoid glycosides. The phenylpropanoid glycosides composition is characterized in that: when the composition is used as an anti-oxygenic medicine or health care product, the composition can be used for treating the disease caused by damaging the related free radicals such as aging, atherosclerosis and ischemia-reperfusion injury; and when the composition is used as the antioxidant additive for the food and the forage, the composition can be used for protecting or alleviating the forage from rancidity and metamorphosis, the nutritive value from decreasing and the palatability from variation. The phenylpropanoid glycosides composition has the advantages that: the preparation prepared with the composition as main component can be tablet, capsule, granule, injection, dropping pill, liquid preparation and powder; and the new plant natural antioxidant with nature, efficiency and low toxicity is provided.

A metamorphosizing gift item in the form of a silk worm display and a method of gift-giving which utilizes the metamorphosis of silkworms into moths as representative of transformation in the gift-recipient's life. The silkworm display includes an open-ended transparent container closeable using a perforated lid. A silkworm cocoon spun on a twig and a plurality of artificial plants are anchored to a foam block affixed to the bottom inside of the container. The block is covered with peat moss to provide a realistic natural setting for the cocoon. The gift item is placed in a prominent location to allow observation in the morning upon rising from bed and before retiring to bed of the metamorphosis of the silkworm in the cocoon into a moth and the emergence from the cocoon. The metamorphosis symbolizes transformation in the gift-recipient's life such as a wedding, birth, recovery from illness, new job, and the like.

The invention discloses a preparation method of a Crassostrea hongkongensis fixation medium. The preparation method comprises the following steps that (1) a plurality of rectangular plastic sheets are made and a round hole with the radius being 3-5 mm is formed in each plastic sheet, wherein the length of the plastic sheets is 10-20 cm, the width of the plastic sheets is 2-5 cm and the thickness of the plastic sheets is 1-3 cm; (2) the plastic sheets are strung through a rope, a plastic tube is arranged between every two adjacent plastic sheets, the plastic tubes are arranged on the rope in a sleeved mode, and then the preparation process of the Crassostrea hongkongensis fixation medium is completed. The invention further discloses the Crassostrea hongkongensis fixation medium and an application method of the Crassostrea hongkongensis fixation medium. After being processed through oxalic acid, fresh water and the like, the Crassostrea hongkongensis fixation medium is used as an eyespot larva collection fixation medium; the Crassostrea hongkongensis fixation medium increases the metamorphosis rate of Crassostrea hongkongensis larvas, accelerates juvenile mollusk growth, improves the juvenile mollusk survival ability and increases the juvenile mollusk yield, has the advantages of being capable of being recycled multiple times, light, convenient to use, good in corrosion resistance and the like and is worthy of popularization and application.

The invention relates to factory fry breeding of aquaculture, in particular to a seedling collection facility for rapana venosa factory seed culture and a method, wherein the seedling collection facility consists of a plastic corrugated plate with a rough surface and a support for fixing the plastic corrugated plate, the plastic corrugated plate is fixed in a chute arranged on the support in parallel, and the side surface relative to a chute connecting rod is bundled up a rope which is parallel to the chute connecting rod. Oyster young shellfishes are firstly adhered on the plastic corrugated plate to be used as animal baits during the process of trophic conversion and metamorphosis of rapana venosa larvae before the seedling collection facility is thrown in. When more than 50 percent of the rapana venosa larvae grow between the later stage of three varices and the initial stage of four varices, and the seedling collection facility is thrown into a nursery pond in a mode that the plastic corrugated plate is in a plane stereo hierarchical mode, thereby leading the red screw larvae to be adhered on the plastic corrugated plate adhered with the oyster young shellfishes, completing the process of the trophic conversion and the metamorphosis and doing intermediate breeding of young screws. The seedling collection facility for rapana venosa factory seed culture can lead the rapana venosa larvae to smoothly complete the process of the trophic conversion and the metamorphosis in factory seed culture.

The invention relates to a method of quickly building an ecological oyster reef. The method comprises making an ecological oyster reef body, ecologically and quantitatively acquiring young oysters, carrying out floating-type quick growth, releasing at fixed spots regularly and other steps. The design of the method herein is achieved using the features of oysters in attachment and metamorphosis stage, growth stage, and breeding stage according to the biological and ecological principles of the oysters. The ecological oyster reef herein is made with natural materials and is harmlessly degradable; the ecological oyster reef body has light self-weight, so that settling risk is reduced and fry attachment efficiency is high; the staged floating-type reel body means helps evidently increase the biomass quantity and brood amount of the oyster reef and evidently increase the fry abundance in the breeding stage and the expanding rate of the reef body. in a word, the ecological oyster reef builtvia the method herein has the advantages that the reef has good environmental friendliness and ecology, fry harvesting efficiency is high, and growth speed is high; the problems are solved that existing oyster reel materials have poor ecology and environmental friendliness, the reef body has low fry-acquiring efficiency, growth rate, survival rate and breeding efficiency, and oyster resource-deficient regions have difficulty of building oyster reefs.

The invention discloses a method for artificially breeding young paphia textzle gmelin. After searching, the researches on paphia textzle gmelin at home and abroad are just rising, relevant reports are few and the researches relating to the breeding method of young paphia textzle gmelin are never disclosed in any technology. The large-scale breeding of young paphia textzle gmelin is carried out by the technical measures of strengthening parents, artificially hastening parturition, artificially incubating, choosing excellent D-typed larvae, culturing larva, metamorphosis-attaching larvae and culturing juvenile mollusks. The method for artificially breeding young paphia textzle gmelin, disclosed by the invention, has the characteristics of uniqueness and advancement, a higher academic leveland a practical value; the supply and demand contradiction of paphia textzle gmelin can be fundamentally solved and the breeding industry chains of paphia textzle gmelin are formed along the coast ofBeibu Gulf. The method for artificially breeding young paphia textzle gmelin is important for gradually recovering natural resources of paphia textzle gmelin and promoting sustainable development of artificial breeding of paphia textzle gmelin.

The invention relates to industrialized seedling culture production of aquiculture, in particular a seedling collecting facility and method of industrialized rapana venosa seedling culture. The seedling collecting facility comprises plastic corrugated sheets with rough surfaces and a bracket fixing the corrugated sheets. The plastic corrugated sheets are fixed in clamping troughs on the bracket in parallel, and ropes in parallel to clamping trough connecting rods are enlaced at the side face opposite to the clamping trough connecting rods. In the method, juvenile oyster mollusks, used as animal baits in the eating pattern transformation and metamorphosis process of rapana venosa larvae, are adhered to the plastic corrugated sheets firstly before the seedling collecting facility is put into use; when more than 50% of the rapana venosa larvae grows to the later stage of three spiral whorls to the initial stage of four spiral whorls, the seedling collecting facility is put into use as the plastic corrugated sheets are in multi-plane three-dimensional layered mode in a seedling culture pond, and the rapana venosa larvae are adhered to the plastic corrugated sheets adhered with the juvenile oyster mollusks to complete the eating pattern transformation and metamorphosis process and carry out juvenile rapana venosa intermediate culture. By adopting the invention, the eating pattern transformation and metamorphosis process ofthe rapana venosa larvae can be completed successfully in industrialized seedling culture.

An ecological culture method for frog features optimal non-pollution water, insect source and vegetation, inculating in inculating pool whose water has the depth less than 2 cm and the temp lower than 25 deg.C, the nutritive feed for tadpole, which contains starch, protein, mineral powder, leftover of meat and tender plant, culturing tadpole in metamorphosis pool while providing high-protein feed, and deratizing 2-3 times per year.

The invention belongs to the field of aquaculture, and particularly relates to a cultivation method of quasipaa spinosa tadpole metamorphosis larvae. The method comprises a tadpole cultivation pool, ambient conditions, stocking of small tadpoles, a culture method and a method for promoting metamorphosis. The illumination intensity suitable for a tadpole breeding stage, the illumination intensity suitable for a tadpole metamorphosis stage and the illumination intensity for controlling the metamorphosis speed are optimized, so that according to the growth stage and the metamorphosis stage of tadpoles, characteristic nutrition is optimized, and a water quality control method of combination of quicklime water and slow flowing water is optimized; for the tadpoles which are hatched in spring, conditions of illumination, water temperature, nutrition and the like are optimized, so as to shorten the growing period of the tadpoles; for the tadpoles which are hatched in autumn, corresponding conditions of illumination, water temperature, nutrition and the like are also optimized, so as to extend the growing period of the tadpoles; the growing development and metamorphosis development of the tadpoles are promoted, and diseases can be prevented, thereby increasing the survival rate and metamorphosis rate of the tadpoles.

The invention relates to a gene analysis and detection product, in particular to a detection kit and a detection method which are applicable to the polymorphism of a sheep BMPR-1B gene, namely A746G. The detection kit for the polymorphism of the sheep BMPR-1B gene, namely the A746 mainly comprises amplification solution, at least one gene chip, hybridization buffer solutions I and II, prehybridization solution, Taq enzyme, and a hybridization chromogenic reagent. In addition, the method for detecting the polymorphism of sheep BMPR-1B gene A746G by utilizing the kit comprises the following steps of: preparing a plurality of ovine chromosomal deoxyribonucleic acids (DNA) for later use; assembling the kit; amplifying by a polymerase chain reaction (PCR) method; performing metamorphosis treatment; prehybridizing and hybridizing; and detecting a hybridization signal. The kit has high sensitivity and accuracy rate, is easy to operate, can effectively improve work efficiency, is economic and practical, and is applicable to the detection of the polymorphism of the sheep BMPR-1B gene, namely the A746G; and by the detection method, large-scale detection is realized, and the method is simple, convenient and practical, and greatly improves work efficiency.

The invention discloses a method for improving attachment metamorphosis of coral larvae. The method comprises the following steps of transferring the coral larvae into a vessel filled with filtered seawater, adding clean calcified algae into the vessel, culturing the coral larvae for 2 days under the conditions that the culture temperature is 26-27 DEG C and the salinity reaches 33 ppt, and observing the attachment metamorphosis condition of the larvae without water replacement and inflation in the culturing process. By using the method, the attachment rate of the coral larvae is increased from 1% or below to 70% or above within 4-12 hours, and the metamorphosis rate of the attached coral larvae approaches 100%. The method has the advantages of being easy and convenient for operation, obvious in induction effect and capable of obviously increasing the attachment metamorphosis rate of the coral larvae and providing a technical guarantee for large-scale cultivation of coral seedlings.

The invention relates to a stage-by-stage pinctada martensii colony selective breeding method. The method comprises the following steps of: collecting 3 to 5 pinctada martensii breeding colonies from different sea areas; screening out individuals with the shell length 15 to 20 percent longer than the average shell length from each colony to serve as alternative parent mollusk; marking the alternative parent mollusks respectively to breed, wherein the selection intensity is 10 to 15 percent; performing secondary breeding; selecting 40 to 60 individuals with mature gonads respectively from eachalternative parent mollusk colony; dissecting and scissoring the gonads and mixing sperms and ova respectively to perform artificial insemination; and performing optimization in a metamorphosis period, a juvenile mollusk period, an adult mollusk period and a parent mollusk period, wherein the selection and remain rate is 50 to 60 percent and a fast-growth excellent variety (system) can be cultivated after selection of 4 to 5 generations. The method has the advantages that: a fast-growth and high-stress-resistance excellent new variety suitable for culture sea areas environment in China can becultivated by performing the stage-by-stage colony selection on multi-generation pinctada martensii; and the selective breeding method is simple and practicable and scale production can be realized.

The invention discloses a parent litopenaeus vannamei breeding system and method. The parent litopenaeus vannamei breeding system and method are designed and obtained by simulating the natural living state of litopenaeus vannamei. By means of the breeding system, the structure is simple, the energy consumption is saved, and management is convenient; as for the litopenaeus vannamei bred through the breeding system and method, bodies are strong, appendages are sound, body colors are transparent, stomachs and intestines are plump, body surfaces are smooth, attachments are avoided, and the three kinds of viruses including the WSSVes, the TSVes and the IHHNVes are avoided; in addition, the parent litopenaeus vannamei is large in egg laying amount, long in continuous egg laying time and high in nauplius hatchability, metamorphosis rate, young litopenaeus vannamei breeding rate and survival rate.

The invention discloses quasipaa spinosa tadpole feed and a preparation method thereof. The quasipaa spinosa tadpole feed is prepared from fish meal, earthworm powder, insect protein mixed powder, corn flour, wheat bran powder, bean pulp, rapeseed dregs, strong flour, alpha-starch, wheat flour, enteromorpha seaweed meal, mulberry leaf powder, yeast powder, fish oil, soybean oil, phosphatide oil, 50-percent choline chloride, beta-1,3 glucan, mineral substance premixes, vitamin premixes, lactic acid bacteria and bacillus subtilis through multiple times of mixing and smashing. The feed has the advantages that used raw material sources are stable; a formula is reasonable; a production process is simple and feasible; the whole nutritional requirements of the high-density cultivation of quasipaa spinosa tadpoles can be met; the cost is relatively low; the problems of bait storage difficulty, germ breeding and the like in the cultivation process can be effectively solved; the quality is safe and reliable; the tadpoles can fast grow; the death rate is low; the metamorphosis time is early; the feed conversion rate is high; the cultivation benefits are better.

The invention discloses microcapsule initial feed for prawn larva cultivation. The microcapsule initial feed for the prawn larva cultivation comprises, by weight, the following raw material components: 20-40% of enzymolysis barley pest thick liquid, 10-25% of fish meal, 5-10% of shrimp chaff, 10-25% of bean pulp, 1-5% of fairy shrimps, 1-6% of yeast powder, 0.5-2% of lecithin, 0.5-2% of fish oil, 0.4-1% of monocalcium phosphate, 1-20% of gelatin, 5-20% of maltodextrin, 0-2% of sodium carboxymethylcellulose, 0.1-2% of Chinese herbal medicine polysaccharide, and 1-10% of additive agent. The microcapsule initial feed for the prawn larva cultivation can greatly improve the growth speed, the metamorphosis rate and the immunocompetence of prawn larvae, and by means of a microcapsule manufacturing technique, the problem of water pollution caused by scattering of feed is solved.

The invention provides a nutritional bait for growth and development stages of rana spinosa tadpoles, which is prepared from the following raw materials in percent by weight: 22-25% of pumpkins, 22-25% of sweet potatoes, 20-24% of fish meal, 8-10% of silkworm chrysalis meal, 6-8% of wheat bran meal, 8-10% of kelp, 4-6% of saccharomycetes, 0.5-1% of calcium and zinc mixture, 1-2% of carrots and 1-2% of vitamin C. According to the principle of strong pertinence, convenience and feasibility, obvious effects and cost saving, animal and plant-derived matching feed is fed in fast growth and development stages of the rana spinosa tadpoles, so that local agricultural by-product resources and protein resources are fully utilized, the breeding cost is reduced, and reasonable allocation of the resources is realized; the mashed kelp which is added into the bait enhances the binding properties of a food pellet and causes no pollution to water quality; and the saccharomycetes can maintain the balance of the intestinal flora of the tadpoles, promote the health growth of the tadpoles, shorten the metamorphosis stage of the tadpoles, improve the survival rate of the tadpoles to the metamorphosis stage as well as increase the economic benefits.

The invention relates to the technical field of aquaculture, in particular to a preparation and an application method for inducing settlement and metamorphosis of capitulum mitella linnaeus larvae with juvenile hormone-III. The invention adopts the technical scheme that a preparation for inducing the settlement and the metamorphosis of the capitulum mitella linnaeus larvae is prepared in a water body by the following steps of carrying out solubilization with dimethyl sulfoxide according to a weight-to-volume ratio of the juvenile hormone-III to dimethyl sulfoxide as 1 / 25 (w / v), adding alcohol to prepare the preparation containing 0.1mg / mL juvenile hormone -III, and storing at -20 DEG C. Filtered sea water is added to prepare inducing sea water before use. The preparation is simple to operate, low in cost, stable in action and significant in inducing effect, and a metamorphosis rate can reach 86%. The method presents appropriate concentration, treatment time and inducing opportunity for application of the preparation and is a good method for inducing the settlement and the metamorphosis of the capitulum mitella linnaeus larvae, and the metamorphosis rate of the larvae is up to 95%.

The invention discloses an oil-gas field water scaling tendency predicting system and method. According to the oil-gas field water scaling tendency predicting system and method, a placing platform isprovided with a sample preprocessing module, a sample injection module, a water quality analyzing module and a scaling predication module, wherein the sample preprocessing module is used for performing homogenization and impurity removal treatment on a water sample obtained on site; the sample injection module is used for injecting the on-site-collected water sample into the predicting system forwater quality analysis and assay; the water quality analyzing module is used for measuring component content and pH of the purified water sample; the scaling predication module is used for acquiring required parameters from the water quality analyzing module and performing predication according to a pre-established scaling tendency predicting model. The oil-gas field water scaling tendency predicting system and method is automatic in operation, short in analyzing cycle, and capable of avoiding the problems such as sample metamorphosis and scale precipitation, improving the accuracy of analysisresults and achieving timeliness; by computerizing the scaling predicting model, the oil-gas field water scaling tendency predicting system and method can avoid mistakes and personal errors of operators, achieves simplicity and rapidity and improves timeliness and accuracy.