71 results about "Larimichthys polyactis" patented technology

The invention provides a little yellow croaker female fish and large yellow croaker male fish crossbreeding method, and belongs to the technical field of aquaculture seawater fish larval breeding. The method comprises the following steps of 1, parent selection and culture; 2, artificial hasten parturition and insemination: a, artificial hasten parturition; b, artificial egg extrusion and semen collection; c, artificial dry process and insemination; d, egg washing; 3, larval breeding management; 4, larva and young fish culture. The method has the advantages that the little yellow croaker and large yellow croaker crossbreeding is performed; new varieties with high growth speed and excellent quality can be cultured; in addition, the fertility rate of the new varieties can reach 65 percent or higher; the hatching rate reaches 92 percent or higher; important application values are realized on the production; the health development of the aquaculture industry in China is promoted.

The invention discloses calcium supplementing piglet feed, which is prepared from the following ingredients in parts by weight: 120 to 140 parts of soybean meal, 6 to 9 parts of fresh little yellow croakers, 10 to 15 parts of kelp, 10 to 17 parts of dried small shrimps, 7 to 13 parts of animal bone meal, 3 to 5 parts of spina date seed, 5 to 7 parts of dry vinasse, 2 to 3 parts of Itoa, 2 to 4 parts of roughhaired holly root, 6 to 8 parts of hulled oat, 1 to 2 parts of angelica powder, 10 to 13 parts of chenopodium album, 3 to 5 parts of negundo chastetree leaves, 4 to 6 parts of corn stigma and 5 to 7 parts of nutrition flavoring powder. The feed provided by the invention has the advantages that the calcium requirements of piglets can be met, and the piglet growth vigor can be improved, wherein the fresh little yellow croakers, the dried small shrimps and the animal bone meal are subjected to heat treatment, the bone can be limp, the calcium can be more conveniently digested and absorbed, the piglet immunity is improved, and the piglet health is promoted.

The invention discloses a method for artificially-induced spawning of little yellow croaker and belongs to the field of agricultural seawater fry rearing. The method includes that little yellow croaker of one year old and 100-200g in body weight is adopted as parent fishes for domestication strengthening; after strengthening, luteinizing hormone releasing hormone analogue number 2 (LHRH-A2) is adopted for dilution, the diluent is injected in one time, and the parent fishes can spawn in a cement pool after 24-26h. By the method, the little yellow croaker can smoothly spawn in the indoor cement pool, induced spawning rate can reach 75%, fertilized egg hatching rate reaches 80%, and needs on artificial fry cultivation of the little yellow croacker can be met.

The invention relates to a primer sequence and a method for rapid identification of pseudosciaena crocea, larimichthys polyactis and collichthys lucidus. The primer sequence is as follows: 1F:5'-GGAAAGAGCCAGGAAAGC-3' and 1R:5'-GGCGGAACTCTGAGCAAA-3'. The method includes the steps of (1) extracting individual genomic DNA; (2) synthesizing a specific primer for sequence amplification and performing PCR (Polymerase Chain Reaction) amplification; and (3) detecting the PCR product through agarose gel electrophoresis, taking pictures and performing recording, obtaining respective specific DNA fragment spectrograms of the three kinds of fishes according to different migration distance of the amplification products, and performing distinguishing in accordance to attached spectrograms. The method can simply and accurately distinguish individual samples of the three kinds of fishes, and provides a new fast research method for germplasm identification of the three kinds of economic fishes with similar appearance.

The invention discloses a method for making instant little yellow croaker. The method comprises the following steps: 1) pretreatment; 2) fishiness removal and salting; 3) rinsing; 4) soaking; 5) steaming; 6) coating; 7) frying; and 8) vacuum packing. The taste in dipping juice enters the meat by dipping; the original fresh taste of fish is reserved and the fragrance of lotus leaves is left in the fish in the lotus leaf wrapping and steaming process, so that flavoring and greasiness removing effects are achieved; the coating process prevents the meat of the little yellow croaker from scattering in the frying process and ensures that the product is parched outside and tender inside after drying; crushed spearmint, cinnamon leaves and fennel are combined with garlic, so that the product is more delicious; meanwhile, the product is golden yellow in appearance and interspersed with jade green, so that the appetite is stimulated; the instant little yellow croaker prepared by adopting the method has good mouthfeel and long shelf life, is safe in eating in the absence of preservatives, sanitary and convenient to eat and carry; and the making method is simple, reasonable and strong in operability, and easily realizes industrialized production.

The invention discloses a preservative and fresh-keeping method for fish meat. The preservative and fresh-keeping method comprises the following steps of: putting the fish meat into fermentation brine for soaking and fermenting; getting out the fish meat after the fermentation; and drying the fermented fish meat, wherein the fermentation brine comprises the following components in part by weight: 10-40g / L of salt, 20-50g / L of sucrose, 5-10g / L of yellow rice wine, 3*107 -3*108cfu / L of lactobacillus acidophilus, 3*107-3*108cfu / L of lactobacillus plantarum and the balance of water. According to the preservative and fresh-keeping method disclosed by the invention, the lactobacillus fermentation method is firstly applied to preservative and the fresh-keeping of the fish (grass carps and small yellow croakers). According to the method, the operation is simple, the health of the human body can not be affected, and the method can be intensively studied and popularized to the storage of the fishes on the market.

The invention discloses a method for culturing little yellow croakers by artificially desalting seawater salinity. The method particularly includes the steps: (1) disinfecting two culture water tanksand four desalting water barrels, preparing the seawater salinity of one culture water tank to reach 2.6-3.2%, preparing the seawater salinity of the other culture water tank to reach 0.6%, and preparing the seawater salinity of four desalting water barrels to reach 2.2%, 1.8%, 1.4% and 1.0%; (2) selecting well-fed adult little yellow croakers without wound surfaces, placing the selected little yellow croakers into the culture water tank with the seawater salinity of 2.6-3.2% to temporarily culture the little yellow croakers; (3) sequentially transferring the little yellow croakers into the desalting water barrels with the salinity of 2.2%, 1.8%, 1.4% and 1.0%, and keeping the little yellow croakers into the desalting water barrels for 4 hours to hunger the little yellow croakers; (4) transferring the little yellow croakers into the culture water tank with the salinity of 0.6% from the desalting water barrels. According to the method, desalting can be completed within one day, and theculture survival rate reaches up to 95% or more. Compared with the prior art, time is greatly shortened, desalting cost is reduced, and the survival rate is remarkably increased.

The invention discloses a collagen extraction process based on fish scales of small yellow croakers. The process comprises the following steps: (1) pre-treatment: cleanly washing the fish scales of the small yellow croakers, and soaking the fish scales with 5 percent of sodium hydroxide for 22 hours; washing the soaked fish scales with tap water until washing liquid is neutral, and soaking with 10 percent of citric acid for 2 hours; then washing with the water again until the washing liquid is neutral, putting in a 40 DEG C electric constant temperature drying oven for carrying out constant temperature treatment for 8 hours, and finally putting in a pulverizing machine to be pulverized into powder to obtain fish scale powder of the small yellow croakers; (2) extracting the fish scale powder of the small yellow croakers in a constant-temperature water bath pot of 66.5 DEG C for 246 minutes according to a feed-liquid ratio of mass volume ratio of 1 to 13 to obtain collagen extraction liquid; (3) carrying out separation to obtain collagen crude extracts of the fish scales of small yellow croakers. The collagen extraction process disclosed by the invention has the advantages that an original protein structure is substantially preserved and the extraction purity of the collagen is high.

The invention provides a primer and method for identifying germplasm of large yellow croakers and small yellow croakers. The invention is characterized in that the primer sequences are as follows: F1: 5'-TCGGCCTCCTGGGATTTATTGTC-3'; F2: 5'-ATTATCCTGACGGGTACGCTCTAT-3', R1: 5'-ACACGCGGGGGTCTAAC-3'; and R2: 5'-ATATGCATCGGGGTAATCTGAGTA-3'. The method comprises the following steps: adopting a phenol-chloroform extraction method to extract the DNA in the samples of the large yellow croakers or small yellow croakers; carrying out polymerase chain reaction (PCR): the PCR system is 25mu L, various components include Buffer, dNTP, Mg2+, four primers, Taq and suspected DNA in the samples of the large yellow croakers or small yellow croakers, and double distilled water is used for filling to 25mu L; and detecting the product by agarose gel electrophoresis after PCR, observing, photographing and recording the result and comparing the electrophoresis result with the provided standard electrophoretogram to identify the germplasm. The method is quick and accurate.

The invention discloses a method for preparing a functional minced small yellow croaker product by utilizing mixed-bacterium fermentation. The method comprises the main steps: monascus and lactobacillus are added to minced small yellow croakers which are cut and mixed, and the functional minced small yellow croaker product is prepared through joint fermentation. The functional minced small yellow croaker product prepared through joint fermentation of the monascus and the lactobacillus has a good flavor and gel properties, and the problems of heavy fishy smell, poor flavor and the like of an existing small minced yellow croaker product are solved. Food microorganisms applicable during fish product processing can be extended, a novel minced fish product is also developed, and the technological level of aquatic product processing and added value of the product can be increased.

The invention discloses a high-survival-rate propagation method of larimichthys polyactis fries in low-salinity sea areas and belongs to the technical field of seawater fish fry rearing. The method ischaracterized by including following steps: 1), adjusting salinity of a spawning pond; 2), collecting fertilized eggs; 3), separating high-quality fertilized eggs; 4), hatching the fertilized eggs; 5), desalting breeding water, and managing the fries. By the method, impact on embryonic development even death during embryonic development caused by the fact that the high-quality fertilized eggs inthe spawning pond sink to the bottom due to low water salinity can be avoided effectively, and easy collection of the high-quality fertilized eggs is facilitated. By lowering salinity of a nursery pond at a specific rate, normal growth and development of newly-hatched fries can be realized with lowest impact, and highest survival rate is ensured.

The invention relates to the technical field of mariculture fish propagation and breeding, and particularly relates to an early propagation and rapid breeding method of little yellow croakers. The method includes preparation of a parent fish pond and an incubation cylinder, selection of parent fish to nutrient enhancement, ovulation and fertilization, oosperm incubation, breeding cultivation and others. Through the early propagation and rapid breeding method of little yellow croakers, the spawning fertilization time of the little yellow croakers is advanced by 1 month in comparison to nature condition, the rate of inducing spawning is 88.2+ / -0.2%, rate of fertilization is 78.4+ / -0.1%, and the hatching rate is 76.7+ / -0.1%; the fry breeding time of small yellow croaker with body length of 5cm is shortened by 50 days in comparison to that under the nature condition; the average body length of fry at the beginning of June is up to 7.8 cm, the survival rate is improved by 20%; thus the early emergency and advanced marketing of the little yellow croakers are realized; the offspring seeds of the little yellow croakers are high in price and good in economic benefit; meanwhile, the market demand on large-sized little yellow croakers can be released, and a way for protecting the fishing resource of the little yellow croakers in the East China Sea is provided.

The invention discloses a PCR (polymerase chain reaction) identification method for young little yellow croakers and large yellow croakers and a primer. The PCR identification method comprises the following steps: extracting genome DNA of a sample, performing PCR amplification on the extracted DNA with the identification primer, and performing agarose gel electrophoresis detection on the PCR amplification product, wherein the sample is a little yellow croaker when one amplification strip occurs and is a large yellow croaker when two amplification strips occur. The identification method disclosed by the invention is simple and easy to implement and high in specificity, and can clearly identify and distinguish plesiomorphous young little yellow croakers and large yellow croakers.

The invention relates to the technical field of breeding of small yellow croakers, in particular to a feminization inducing method for small yellow croakers with undifferentiated sex glands. The method comprises the following steps: placing fry of small yellow croakers hatched for 13-15 days and having undifferentiated sex glands in seawater containing estrogen with a low concentration of 1-10 [mu]g / L for dipping bath, and performing dipping bath for 2 hours every day and continuous for 60 days, so as to enable the crowd of small yellow croakers to be completely feminized, wherein the selectable estrogen comprises estrone, soybean isoflavone, estradiol, estriol, coumestrol and genistein. The effect of estradiol is more obvious, 1 [mu]g / L estradiol can ferminize 96.6% of a crowd of small yellow croakers, 10 [mu]g / L estradiol can ferminize 100% of a crowd of small yellow croakers, the induction rate is high, the operatability is high, natural environment does not cause limit. Female parent fish guarantee is provided for large-scale artificial breeding of small yellow croakers, a technological route is opened up for study on sex control and monosex breeding of small yellow croakers, and a route for solving the problem of less of female population of small yellow croakers is provided.

The invention relates to a primer and a method for rapidly distinguishing larimichthys polyactis and larimichthys crocea and determining a hybrid variety of the larimichthys polyactis and the larimichthys crocea, which belong to the field of identification of molecular markers. A nucleotide sequence of an upstream primer of the primer is shown as SEQ ID No. 1, and a nucleotide sequence of a downstream primer is shown as SEQ ID No. 2. By adopting the primer and the method, complex steps such as sequence measurement are not needed, after the appropriate PCR proliferation, a hybrid filial generation can be accurately determined as the hybrid variety, and the larimichthys polyactis and hybrid fish can be distinguished, so that a novel simple and rapid identification method is provided for identifying the germplasm of three types of fish with similar appearance.

The invention provides a pseudosciaena polyactis fresh-keeping method. The pseudosciaena polyactis fresh-keeping method comprises following steps: 1, acid solution immersion; 2, composite fresh-keeping solution immersion; 3, film forming; and 4, packaging and refrigeration. The beneficial effects are that: bamboo vinegar and the composite fresh-keeping solution are used for immersion bacteriostasis, no antibiotic or conventional bactericide is added, the pseudosciaena polyactis fresh-keeping method is safe, and is friendly to the environment; characteristic putrefying bacteria in pseudosciaena polyactis can be inhibited obviously, degradation speed of proteins in pseudosciaena polyactis meat is slowed down, fresh keeping degree is improved, and nutrient loss is reduced; oxidation resistance is achieved, oxidative rancidity of grease in pseudosciaena polyactis preservation process is inhibited, and the preservation period and self-life of pseudosciaena polyactis is prolonged; at the same time, sodium alginate polysaccharide gel and metal cations possess film forming performance, so that decoloring and water loss in pseudosciaena polyactis fresh-keeping process are delayed, the mouthfeel close to that of fresh pseudosciaena polyactis is maintained; operation is simple, cost is low, and market application prospect is promising.

The invention discloses a hybrid breeding method of frozen sperms of small yellow croaker and large yellow croaker, and belongs to the technical field of fry breeding of aquaculture marine fish. The method specifically comprises the following steps that small yellow croaker sperms are collected, a sperm dilute containing an anti-freezing agent is added in the small yellow croaker sperms, cryopreservation is conducted, large yellow croaker ovums are collected, the small yellow croaker sperms are thawed, and the sperms and the ovums are subjected to artificial insemination. According to the method, the sperms with the survival rate being 60% after thawing are selected to be crossed with the large yellow croaker ovums, the fertilization rate reaches 67.3%, and the hatching rate is 86.8% or above. The method has the important significance for overcoming reproductive isolation, achieving artificial hybridization, cultivating new varieties, and achieving large-scale fry breeding.

The invention discloses a larimichthys polyactis microsatellite DNA molecular marker. The invention adopts the technical scheme that an enhanced library of larimichthys polyactis microsatellites (GT) 17, (GGT) 9 and (CTAT) 8 is built, larimichthys polyactis polymorphic microsatellite primers are screened, and the genetic polymorphism detection is carried out on larimichthys polyactis microsatellite loca, so that 21 larimichthys polyactis microsatellite markers with rich polymorphism are developed. The larimichthys polyactis microsatellite DNA molecular marker is applicable to researches on the population genetic structure and the genetic variation level of a larimichthys polyactis population.

The invention relates to the technical field of mariculture fish propagation and breeding, and particularly relates to an early propagation and rapid breeding method of little yellow croakers. The method includes preparation of a parent fish pond and an incubation cylinder, selection of parent fish to nutrient enhancement, ovulation and fertilization, oosperm incubation, breeding cultivation and others. Through the early propagation and rapid breeding method of little yellow croakers, the spawning fertilization time of the little yellow croakers is advanced by 1 month in comparison to nature condition, the rate of inducing spawning is 88.2+ / -0.2%, rate of fertilization is 78.4+ / -0.1%, and the hatching rate is 76.7+ / -0.1%; the fry breeding time of small yellow croaker with body length of 5cm is shortened by 50 days in comparison to that under the nature condition; the average body length of fry at the beginning of June is up to 7.8 cm, the survival rate is improved by 20%; thus the early emergency and advanced marketing of the little yellow croakers are realized; the offspring seeds of the little yellow croakers are high in price and good in economic benefit; meanwhile, the market demand on large-sized little yellow croakers can be released, and a way for protecting the fishing resource of the little yellow croakers in the East China Sea is provided.

The invention provides an artificial breeding method for seriola aureovittata. The artificial breeding method for the seriola aureovittata comprises six aspects of parent fish selection, parent fish cultivation, spawning induction, insemination, incubation and fry cultivation. Prawns, drum shrimps, small yellow croakers and fucus are fed as high-quality baits before the spawning induction for nutrition enhancement, so that the quality of fertilized eggs is improved, and the hatching rate is increased; an oxytocic acts on the seriola aureovittata in a feed feeding mode, and the natural fertilizationmode is adopted, so that the stimulation of manual operation on the seriola aureovittata is reduced, and the labor cost is reduced; lecithin, trehalose, proanthocyanidins, laver powder and hyperoside are adopted as auxiliary hatching agents, and ultrasonic stimulation is supplemented, so that the hatching rate of roes is increased, and the malformation rate is reduced; the survival rate of fries is increased by feeding corresponding feed in each growth stage of the fries. By adopting the artificial breeding method for the seriola aureovittata, the hatching rate, the hatching rate and the survival rate are high, the malformation rate is low, the operation is simple, the labor cost is low, and large-scale breeding is easy.

The invention discloses soy-sauce-flavor-type pickling fluid for small yellow croakers. A formula of the soy-sauce-flavor-type pickling fluid consists of the following raw materials of water, a Chinese prickly ash solution, cooking wine and salt. The invention further discloses a soy-sauce-flavor-type pickling method for the small yellow croakers. The soy-sauce-flavor-type pickling method comprises the following steps of performing selection, removing scales, making slits at the back, performing cleaning to remove watery blood, performing pickling, performing low-temperature preservation and the like. A great quantity of research experiment proves that the pickling fluid disclosed by the invention can produce unique soy-sauce-flavor taste, naturally give out fragrant and hot smell, and meet the taste sense enjoyment requirements of people; and when the small yellow croakers are pickled with the pickling fluid, nutrient components can be maintained, and the quality guarantee period of the pickled small yellow croakers at a cold chamber of minus 18 DEG C can be prolonged to 1 year.

The invention discloses a collagen extraction process based on fish scales of small yellow croakers. The process comprises the following steps: (1) pre-treatment: cleanly washing the fish scales of the small yellow croakers, and soaking the fish scales with 5 percent of sodium hydroxide for 22 hours; washing the soaked fish scales with tap water until washing liquid is neutral, and soaking with 10 percent of citric acid for 2 hours; then washing with the water again until the washing liquid is neutral, putting in a 40 DEG C electric constant temperature drying oven for carrying out constant temperature treatment for 8 hours, and finally putting in a pulverizing machine to be pulverized into powder to obtain fish scale powder of the small yellow croakers; (2) extracting the fish scale powder of the small yellow croakers in a constant-temperature water bath pot of 66.5 DEG C for 246 minutes according to a feed-liquid ratio of mass volume ratio of 1 to 13 to obtain collagen extraction liquid; (3) carrying out separation to obtain collagen crude extracts of the fish scales of small yellow croakers. The collagen extraction process disclosed by the invention has the advantages that an original protein structure is substantially preserved and the extraction purity of the collagen is high.

The invention belongs to the technical field of biology, and particularly relates to application of hepcidin expression quantity in larimichthys crocea liver as larimichthys crocea visceral white-spot disease resistance evaluation index and a construction method. The hepcidin expression quantity in the larimichthys crocea liver is applied as the larimichthys crocea visceral white-spot disease resistance evaluation index. The construction method of the resistance evaluation index comprises the following steps: taking healthy small yellow croaker intraperitoneal injection pseudomonas proteinus strain bacterial liquid, and determining a half lethal dose in 96 hours; the method comprises the following steps: injecting a half lethal dose of bacterial liquid of pseudomonas proteinus strains into the abdominal cavity of healthy small yellow croaker for 96 hours, and after infection, taking different tissues to carry out hepcidin gene expression fluorescent quantitative PCR analysis; a regression model of gene expression quantity and bacterium loading quantity is established through fluorescence quantification, and the relationship between hepcidin expression quantity and disease resistance is constructed. Accurate disease-resistant phenotype information is provided for development of breeding of visceral white-spot disease-resistant improved varieties of the small yellow croakers, the accuracy of disease-resistant breeding is promoted, early detection of diseases is realized, and prevention and treatment of the diseases are effectively guided.

The invention belongs to the technical field of oxidative stress models, and particularly relates to a construction method for inducing a larimichthys polyactis liver cell apoptosis model through high-temperature stress. The construction method specifically comprises the following steps: when the culture water temperature is about 20 DEG C, treating larimichthys polyactis according to the heating rate of 2 DEG C / h, raising the water temperature to 32 + / -0.5 DEG C, and treating the larimichthys polyactis at the temperature for 6-12 h, so that the larimichthys polyactis is subjected to oxidative stress reaction to induce apoptosis. According to the construction method, the basic water temperature, the heating rate, the high temperature needing to be reached and the processing time of the high temperature before high-temperature stress are determined, and evaluation indexes for model establishment are provided. The larimichthys polyactis liver cell apoptosis model established through high-temperature stress can be used for researching pathogenesis of the larimichthys polyactis liver oxidative injury, and has important theoretical and practical significance for revealing the larimichthys polyactis liver oxidative injury mechanism and researching and developing efficient liver protection drugs.

The invention discloses a fish posture recognition method, and belongs to the field of image processing. The method comprises the following steps: rotating a preprocessed fish image to enable a fish body to be in a horizontal state in the image; cutting the fish in the rotated image, and zooming the cut fish to a set size; making corresponding labels as a training set and a test set according to the fish postures in the images, and training a convolutional neural network to obtain a fish posture recognition model; and performing posture recognition on the fish in the input image by using the fish posture recognition model. According to the invention, the convolutional neural network is adopted to identify the posture of the small and long fish, and when a training set is made, posture correction, cutting and scaling and other operations are performed on the fish image, so that the method can well adapt to the morphological characteristics of the small and long fish (such as pneumatophorus japonicus and little yellow croaker), and the automatic early processing of a fish processing production line is realized; the defects of long time consumption and large workload of the traditional manual processing are overcome, and the invention has the advantages of rapidness, accuracy and high efficiency.

The invention discloses a preparation method and device for desalted larvae of small yellow croakers, and the method comprises the following steps: 1, selection of a culture pond: selecting the culture pond according to the water amount and the quantity of the larvae of the small yellow croakers, and adding natural seawater and the larvae of the small yellow croakers into the culture pond; 2, fry desalination: dividing the fry into ponds, controlling the seawater salinity in the culture ponds, and carrying out desalination culture on the larimichthys crocea fry; and 3, transfer breeding, wherein after the fry desalination work in the step 2 is completed, the desalted larimichthys crocea fries are transferred to a salt and fresh water area to be bred; and the culture pond is a cement pond, a water salinity adjusting device is arranged above the cement pond, and a salinity monitoring device is arranged on one side of the cement pond. According to the method, the whole pond is fully covered with water, local salinity sudden change of water in the culture pond is greatly reduced, fry stress reaction caused by salinity change is reduced to the maximum extent, preparation of desalted fry of the small yellow croakers is achieved, and therefore the yield of small yellow croaker culture is increased.

The invention discloses a construction method of a larimichthys polyactis growth hormone bioreactor silkworm strain, and belongs to the technical field of silkworm transgenic genetic breeding. The method comprises the following steps of (1) synthesizing a larimichthys polyactis growth hormone and transferrin fusion gene; (2) obtaining piggBAC transgenic plasmids pLX-Red-PcGH-TF; (3) introducing the transgenic plasmids into silkworm fertilized eggs; (4) obtaining G1-generation silkworm eggs; (5) screening marker gene positive individuals; (6) verifying efficient expression of larimichthys polyactis growth hormone in silkworm; (7) identifying genetic stability; and (8) establishing the larimichthys polyactis growth hormone bioreactor silkworm strain. According to the invention, on one hand,the larimichthys polyactis growth hormone is produced with high efficiency and low cost, and can be further processed into a larimichthys polyactis functional additive to be applied to larimichthys polyactis culture; and on the other hand, the development dilemma faced by silkworm production is relieved, and the effect of improving silkworm industry benefits is achieved.

The invention discloses an efficient screening method for parents required by preparation of a fast-growing larimichthys polyactis new strain, and belongs to the technical field of larimichthys polyactis parent screening. The screening method comprises the steps that a larimichthys polyactis family is constructed, PIT marking is carried out on larimichthys polyactis with the high survival rate, recovering and temporary culturing are carried out on larimichthys polyactis with PIT marking finished, body mass measuring and breeding performance evaluating are carried out, and parents required by preparation of the fast-growing new strain are recognized and screened out. According to the method, the accuracy of excellent parent selection can be remarkably improved, and a foundation is laid forfast obtaining the fast-growing larimichthys polyactis new strain. By the adoption of the method, relative genetic progress of 5.38% can be obtained for each generation. By comparing breeding value selection and phenotype selection effects, it can be found that the breeding value selection accuracy is improved by 94.35% relative to phenotype selection.

The present invention relates to an enzyme-type natural seafood powder and a preparation method thereof. The seafood powder uses larimichthys polyactis and short necked clams as main raw materials and is prepared by enzymolyzing and blending. The mass ratio of the larimichthys polyactis and short necked clams is 1 : (0.1-10) and more preferably is 1 : 1. The obtained seafood powder has both olfactory sense and mouthfeel, is long in maintaining time, tastes full and prominent, has a natural seafood flavor, and is mellow and delicious.

The invention relates to the technical field of bean food processing, and particularly relates to a process for fermenting stinky preserved soybeans. The process comprises the following steps: washing high-quality soybeans, drying in the air, roasting, soaking, and mixing with little yellow croaker to ferment for 5-7 days in a sealed condition; separating soybeans from little yellow croaker, steaming, inoculating one or more of aspergillus niger, rhizopus oryzae and glucoamylase in the steamed soybeans, seasoning the fermented soybeans, filling into cans, and pasteurizing to obtain a finished product. The stinky preserved soybeans prepared by the process have unique flavor and mellow taste, and can be used for promoting elimination of heavy metals in a body. According to the stringy fermented soybeans, the protein is increased by 30-35 percent, the total amino acid is increased by 22-26 percent, the large molecular weight protein degradation rate is more than 99.2 percent, and the small molecular protein is more than 50.1 percent of soluble protein. The stinky preserved soybeans can be stored for 8 months at normal temperature when chemical preservative is not added.