85 results about "Channa argus" patented technology

The invention relates to a snakehead seedling expandable compound feed and a method for comprehensively feeding snakehead seedlings by using the same. The snakehead seedling expandable compound feed has buoyancy rate of 100 percent, floats in water when fed to the snakehead seedlings, is more soft and elastic after entering the water, is closer to the meat in the aspect of physical character, hasgood body color and mouth feel as well as special taste and better water stability, and solves the difficulty of food-transferring domestication. Multiple vitamins and multiple mineral elements premix prepared in the feed is set according to the demands of the snakehead seedlings, has the functions of promoting the growth and improving the survival rate, is suitable for the nutrition demands of the snakehead seedlings, has low feed coefficient, ensures rapid snakehead growth, expands the matched feed, avoids the loss of nutrients and the pollution to water, improves the feed utilization and reduces the generation rate of diseases, thereby lowering the feeding cost, and improving the feeding benefit. The snakehead can be fed together with the chub and the bighead to gain higher economic benefit and is suitable for the northeast area of China. The meat of commercial snakehead has high quality and best mouth feel.

The invention discloses a fermented Chinese herbal immunopotentiator used for snakeheads. With the efficacy of prevention, health care, treatment and immunoregulation, the Chinese herbal immunopotentiator is an ideal, green, environmental friendly, safe and novel feed additive for substituting antibiotic drugs. The fermented Chinese herbal feed additive is prepared by subjecting compound Chinese herbal medicines to a process of ''ultrasonic wave assisted extraction of Chinese herbal medicines and multi-strain two-step fermentation'', has the advantages of both Chinese herbal medicines and probiotics, can efficiently condition the intestinal health of snakeheads, treat both symptoms and root causes, consolidate the basis and foster vitality, maintain intestinal microecological balance and an optimal immune state, improves the digestibility of nutrients, improves the body immunity of snakeheads, improves farming profits, and reduces farming risk. The Chinese herbal immunopotentiator can be used for replacing antibiotics, has no adverse effect on snakeheads, is safe to use, and is free of drug residue, drug resistance and other problems, thus having broad market prospects.

The invention discloses an artificial propagation method by hybridizing female channa maculata and male channa argus, which belongs to the technical field of crossbreeding of fishes. The method comprises the following steps of: picking parents; performing artificial hormone expediting for the first time; performing the artificial hormone expediting for the second time; allowing the parents to perform self-copulation and lay eggs; hatching the fertilized eggs; and hatching the fertilized eggs to break the membranes. The method has the following advantages that: simple and convenient operation and low cost are achieved by using a bubble chamber and the bubble chamber is suitable for large-scale seedling production, has a good heat preservation effect and a good shielding effect and is favorable for oestrus and spawning of the parents; through the two expediting processes, the oestrus of the male and female fishes has high synchronism, the expediting rate reaches over 96 percent and the fertilization rate reaches over 85 percent; pairing is performed after the second expediting, so that the harm caused by the male fish to the female fish is reduced and the death rate of the female fishes is ensured to be below 5 percent; the fish eggs laid by each pair of parents are individually hatched in one bubble chamber, so that the influence of bag eggs is reduced and the hatching rate is improved; and the hatching water temperature is controlled within the range from 28 to 30 DEG C, so the hatching rate is effectively increased and can reach over 85 percent.

The invention discloses a marking primer for identifying channa argus and channa maculate as well as F1-generation channa argus*channa maculate and channa maculate*channa argus hybridized by the channa argus and the channa maculate on the basis of a mitochondrial DNA (deoxyribonucleic acid) sequence. The marking primer is BY14, and the marking primer BY14 consists of a left-end primer sequence BY14F and a right-end primer sequence BY14R, wherein the left-end primer sequence BY14F is 5'-CCCGTCACCCTCACCTAA-3', and the right-end primer sequence BY14R is 5'-GCGTGGGGCTACCTGTTC-3'. The invention further discloses a method for identifying the channa argus and the channa maculate as well as the F1-generation channa argus*channa maculate and channa maculate*channa argus hybridized by the channa argus and the channa maculate by using the marking primer. The marking primer can be used for rapidly identifying the channa argus and channa maculate as well as the F1-generation channa argus*channa maculate and channa maculate*channa argus hybridized by the channa argus and the channa maculate.

The invention relates to a method for quickly and accurately identifying northern snakehead, Taiwan snakehead and hybrid snakehead. The method comprises the steps as follows: 1) synthesizing primers; 2) extracting DNAs (Deoxyribose Nucleic Acids) from the northern snakehead, the Taiwan snakehead and the hybrid snakehead [the northern snakehead (Venus symbol) * the Taiwan snakehead (Mars symbol)]; 3) carrying out SRAP-PCR (Sequence-Related Amplified Polymorphism-Polymerase Chain Reaction) reaction by adopting a renaturation temperature change method; 4) carrying out electrophoresis detection; and 5) combining the primers capable of being used for identifying the northern snakehead, the Taiwan snakehead and the hybrid snakehead [the northern snakehead (Venus symbol) * the Taiwan snakehead (Mars symbol)], processing stripes by using a Gelpro32 software, marking the sizes of the stripes, and identifying in other sampled groups. According to the method, the northern snakehead, the Taiwan snakehead and the hybrid snakehead [the northern snakehead (Venus symbol) * the Taiwan snakehead (Mars symbol)] can be easily identified by utilizing an SRAP technology by cutting away a small amount of fin rays or other fish tissue parts only without killing fishes.

The invention discloses a snakehead fish cultivation method. The technical scheme adopted by the method comprises: creating mimic-ecological pond conditions, executing the tie-in cultivation of multiple fish species, feeding fresh and live baits and pellet feeds, usually regulating the water quality and purifying the water body, and strengthening day-to-day management and disease control; and the method is characterized in that the created mimic-ecological pond conditions are as follows: an area of 1-5 mu is adequate for the area of a cultivating pond, the water depth is 1.5-2m, the ridge of the pond is more than 0.5m higher than the water surface, the dissolved oxygen content is more than 5 mg/L, and the transparency is more than 30cm; and an aquatic weed belt with a length of 1.5-2.0m is transplanted along the edge of the pond. By using the snakehead fish cultivation method disclosed by the invention, a higher yield can be ensured, the cultivating environment can be improved, and the quality of the snakehead fish can be enhanced, thereby increasing the cultivating benefits; and the water quality is effectively improved, the disease incidence rate of fish bodies is reduced, and the quality and benefits of the commercial snakehead fish are improved. The snakehead fish cultivation method disclosed by the invention is universally applicable to the artificial large-scale snakehead fish cultivation for freshwater aquiculture farmers in the middle and lower reaches of Yangtze River and the south of the Yangtze River.

The invention relates to a feed additive premix for preventing and controlling the snakehead deformity, and belongs to the technical field of feed. The feed additive premix comprises compound vitamins and compound trace elements; raw materials are stable in source, the nutrition is comprehensive, and the requirements on the vitamins and the mineral nutrition for high-density cultivation of raw fish (snakehead) in the areas of Jiangsu and Zhejiang can be met; the feed additive premix is safe and efficient after being used for a long time, has no toxic and side effects, can reduce the cultivation death rate of the raw fish (snakehead) in the areas of Jiangsu and Zhejiang remarkably, and reduces the deformity greatly, the cultivated snakeheads are high in survival rate, high in growth speed and low in deformity, and the economic benefits are remarkable.

The invention discloses a Channa argus formula feed, which comprises Hermetia illucens L larva powder and other ingredients. According to the present invention, the squid paste is replaced by the Hermetia illucens L larva powder in the Channa argus formula feed, such that the food intake and the palatability (the Hermetia illucens L larva powder has advantages of attracting effect on Channa argus,feed palatability improving and feed utilization improving) cannot be affected, the health of Channa argus can be improved, and the growth of Channa argus can be promoted; and the Hermetia illucens Llarva powder has characteristics of controlled quality and less deterioration, and has the low cost compared to the squid paste, such that the Hermetia illucens L larva powder is expected to be widely used to replace the squid paste in the Channa argus formula feed.

The invention discloses a disease-resistant immunoenhancement cyclo-(phenylalanine-serine) for channa argus, provides a composite feed for channa argus, in which pseudomonas putida metabolin cyclo-(phenylalanine-serine) is added so as to improve the disease-resistant ability of the channa argus and promote growth. After the channa argus is fed with the feed, through immunological detection, the serum lysozyme activity, serum phagocytosis ability and serum bactericidal ability of channa argus in an experimental group are obviously improved respectively up to 78.26U/mL, 63.52U/mL and 75.69U/mL, which are higher than those of a control group (respectively 17.23U/mL, 20.96U/mL and 39.36U/mL). Relative expression of IL-1beta gene of channa argus is up-regulated to 25.81, while relative expression of IL-1beta gene of channa argus in the control group is only 2.45; and by injecting medial lethal concentration of bacteria into fish belly to detect the disease resistance, the accumulative death rate of the experimental group after 15 days is 36% minimally, while that of the control group is 68%, and the survival rate of the experimental group is higher than that of the control group obviously. A comprehensive breeding method provided by the invention, matched with cultivation, makes full use of a water body, and an immunoenhancement is added, thus improving immunity and promoting growth, and enhancing economic benefits.

The invention provides a Channa argus feed and a preparation method thereof; the Channa argus feed comprises, by weight, 5-8 parts of corn flour, 2-5 parts of soybean powder, 6-10 parts of bitter gourd powder, 10-15 parts of pond loach powder, 3-6 parts of Chinese angelica root, 1-2 parts of root of red-rooted salvia, 2-4 parts of honeysuckle flower, 9-11 parts of heartleaf houttuynia herb extract, 5-6 parts of Bacillus subtilis powder, 8-10 parts of BYM (bacteria, yeast and mold), 1-3 parts of solid photosynthetic bacteria, 2-3 parts of Bdellovibrio bacteriovorus and 5-10 parts of vitamin additives. After alcohol extraction and enzymolysis are carried out, the Channa argus feed with reasonable nutritional ingredients and good palatability is prepared. The feed cost can be reduced, the productive performance of Channa argus can be improved, and the flesh quality and resistance of Channa argus can be improved; the Channa argus feed helps solve the problem in the prior art that the Channa argus feed is unreasonable in nutrition and has no effect on enhancing the resistance of Channa argus.

The invention relates to a microorganism-containing compound feed for channa argus. The growth-promoting and disease-preventing compound feed for the channa argus comprises the following raw materials in parts by mass: 25-30 parts of fish meal, 15-20 parts of meat and bone meal, 12-15 parts of shrimp meal, 12-15 parts of soybean powder, 6-8 parts of chicken meat meal, 1-3 parts of wall-broken yeast powder, 2-5 parts of hawthorn fruit powder, 1-2 parts of spirulina powder, 1-2 parts of edible salt, 2-5 parts of earthworms powder, 1-3 parts of fish oil, 2-5 parts of liquorice root powder, 1-3 parts of garlic powder, 1-2 parts of vitamin C, 0.1 part of bacillus subtilis, 0.1 part of lactobacillus plantarum, 0.1 part of rhodopseudomonas palustris, and an appropriate amount of water. The compound feed disclosed by the invention provides nutrients suitable for growth demands of the channa argus in a targeted way according to the growth habits and the physiological characteristics of the channa argus, so that the compound feed is capable of improving water environment, promoting development of the channa argus, increasing appetite of the channa argus, and realizing rapid growth of the channa argus; moreover, the compound feed ensures nutrient intake of the channa argus, and reduces the death rate. The compound feed is rich in nutrition and high in palatability; moreover, the compound feed is capable of enhancing immunity of the channa argus, as well as improving disease resistance and antibacterial ability of the channa argus. The channa argus fed with the compound feed has effectively reduced disease incidence rate and obvious gaining of weight; moreover, the channa argus is active in feed intake and high in feed utilization rate.

The invention discloses cyclo-(alanine-tryptophan) serving as a disease-resistant immunopotentiating agent for channa argus. A marine bacterium metabolite, namely the cyclo-( alanine-tryptophan), is added to a channa argus compound feed provided by the invention, and has the effects of improving the disease resistance of the channa argus and promoting the growth of the channa argus. After the channa argus is fed with the compound feed, through immunological detection, the serum lysozyme activity, the serum phagocytosis capacity and the serum disinfection capacity of the channa argus in an experimental group are all greatly improved and far exceed those of the channa argus in a control group; the relative expression of IL-1 beta genes of the channa argus in the experimental group is raised; the disease resistance of the channa argus is detected through injecting bacteria with a medial lethal concentration into the abdominal cavity of the channa argus, 15 days later, the lowest cumulative mortality rate of the channa argus in the experimental group is 32%, and the lowest cumulative mortality rate of the channa argus in the control group is 68%. According to the comprehensive raising method provided by the invention, the channa argus is bred in a matched manner, water bodies are fully utilized, the immunopotentiating agent is added, the immunity is improved, and the growth is promoted, so that economic benefits are increased.

The present invention discloses a production technology of a blueberry corn instant noodle and relates to the technical field of food processing. The blueberry corn instant noodle is mainly produced by the following raw materials: corn, onion juice, pork extract, lactarius deliciosus powder, channa argus powder, blueberry juice, physalis alkekengi juice, asparagus schoberioides, panax notoginseng extract, imperata cylindrical root extract, leonurus artemisia extract, etc. The blueberry corn instant noodle has abundant sources of raw materials with relative low prices, therefore the production cost of the corn instant noodle is also lower, and the prices of the products are correspondingly cheaper. At the same time the corn instant noodle uses corn as the main raw material which is rich in various nutrients, and in addition, the pork extract, blueberry juice, physalis alkekengi juice and other accessory ingredients not only enhance the mouthfeel of the corn instant noodle, but also enrich nutrition, the three traditional Chinese medicine ingredients including the panax notoginseng extract, the imperata cylindrical root extract and the leonurus artemisia extract also have the effects of cooling blood and stop bleeding, and dissipating and removing blood stasis, and thus the corn noodle is very beneficial to human body health in a long-term consumption.

The invention discloses a method for preparing fishy-smell-removed fish albumen glue by promoting glycosylation through superheated steam. The method comprises the following steps: S1, degreasing treatment; s2, preparing a fish protein glue mother solution; s3, one-step deodorization and decoloration: adding activated carbon into the fish protein glue mother liquor obtained in the step S2, and then stirring and filtering to achieve the purposes of deodorization and decoloration; s4, preparing a fish protein glue-reducing sugar system; s5, ultrasonic pretreatment; and S6, performing second-step deodorization. According to the method for preparing the fishy-smell-removed fish protein glue by using the superheated steam to promote glycosylation, the fish protein glue is prepared by taking a snakehead processing byproduct fish skin as a raw material, resource waste and environmental pollution are avoided, the fish protein glue is extracted by combining ultrasonic waves with composite organic acid in the process, the method is green and environment-friendly, and the extraction time is greatly shortened; meanwhile, on the basis of one-step fishy smell removal and decoloration, superheated steam is adopted for promoting glycosylation to modify the fish protein glue, so that the fishy smell removed fish protein glue is obtained, and the emulsibility and foamability of the fish protein glue are improved.

The invention discloses a method for extraction of Channa argus phospholipid by diol silica gel. The method comprises the steps of: 1) raw material pretreatment: taking fresh Channa argus meat, conducting washing and grinding, then subjecting the ground meat to vacuum drying, and performing crushing so as to obtain Channa argus powder; 2) liquid-liquid extraction: adding an organic solvent I into the Channa argus powder, then fully mixing the substances evenly, conducting ice-bath ultrasonic extraction, then adding water to perform oscillation centrifugation, when the solution stratifies, removing the lower clear liquid; firstly drying the lower clear liquid, then performing redissolving with an organic solvent II to obtain a lipid crude extract, wherein the organic solvent I is a mixed solution of methanol and chloroform in a volume ratio of 1:0.5-2, and the organic solvent II is methanol; and 3) solid phase extraction: activating a diol silica gel solid phase extraction column, loading the crude extract sample, carrying out leaching and elution so as to obtain a purified phospholipid extract.

The present invention discloses a canned lotus root channa argus manufacturing method which comprises the following steps: (1) selecting raw materials with the following ratio: lotus roots 250 grams, channa argus 150 grams, sliced amorphophallus konjac 40 grams, Chinese wolfberry fruits 10 grams, red dates 10 grams, semen coicis 15 grams, poria cocos 15 grams, minced dry ginger 1.5 grams, pepper 1.5 grams, and edible salt 7 grams with a ratio of the solid substances and water of 0.62 : 0.38; (2) adding 50 kg of water into 7.5 kg of pork rod-shaped bones, cooking with a small fire for 3 hours, and removing the pork rod-shaped bones and keeping the soup; (3) conducting enzymolysis at an enzymolysis condition as follows: F: 50 DEG C, PH: 7.0, an enzyme added amount: 0.3%, and a reaction time: 3 hours; (4) canning 304 ml of the bone soup, weighing 500 grams of enzymatic hydrolyzed solid materials, and canning and sealing when the materials are still hot; (5) sterilizing at a medium temperature with a temperature controlled at 110 DEG C for 90 minutes; and (6) cooling, packaging, and warehousing. The canned lotus root channa argus is sterilized gently, which helps maintain nutrition, and the prepared canned lotus root channa argus is an excellent food therapeutic product.

The invention relates to technical field of fish quality detection, in particular to a nondestructive fast detection method for the quality of channa argus. The method comprises the following steps: 1, a channa argus is cut into pieces after being killed, and is stored at the temperature of 0-10 degrees; 2, signal collection, volatile basic nitrogen content determination and near infrared spectroscopy detection are performed on volatile substances of the fish at regular time interval; 3, the signals collected in the step 2 are subjected to linear fitting after being calculated through adopting a mathematical model, the infrared spectroscopy is converted into a quality parameter through adopting the mathematical model, and then a standard signal-to-noise ratio parameter and a standard quality parameter are determined according to the content index of the volatile basic nitrogen; 4, a sample to be detected is taken, the signal-to-noise ratio parameter and the quality parameter of the sample to be tested are calculated through testing to determine the quality of the fish through comparison with the standard parameter. The method has the advantages that the objectivity is strong, the reproducibility is excellent, the operation is simple, the result is intuitive, the information is comprehensive and accurate and the nondestructive effect is realized, the detection result has better practicability at the same time, and the method satisfies the judgment requirements for fish specific components of people.

The invention discloses ACE inhibitory peptide from a snakehead protein source and a preparation method of the ACE inhibitory peptide. Pepsin is used for hydrolyzing snakehead protein, ACE inhibitorypeptide enzymatic hydrolysate high in activity is prepared, an ultrafiltration pipe is used for rough separation, liquid chromatography is used for further separation, and identification is performedto obtain three corresponding polypeptide sequences FRVPTPNVS, HVNKDIAPKL and KIKIIAPPERKYS. Snakeheads are broad in source and low in cost, so that the preparation cost of the ACE inhibitory peptidecan be reduced, the utilization value of the snakeheads can be increased, and the ACE inhibitory peptide is hopeful to be applied to business preparation of blood pressure drugs. Deep utilization of freshwater fish sources is promoted.

The invention discloses a fattening and high-yield feed of channa argus and a production method of the fattening and high-yield feed. The fattening and high-yield feed is prepared from the following raw materials: soya bean meal, millet flour, buckwheat bran, phaseolus calcaratus flour, hoof and horn meal, dried pig blood powder, barley seedlings, Puer tea residues, smilax china leaves, seaweed meal, citric acid residues, straw, yellow peaches, plums, rape flowers, apple flowers, dehydrated cream, atractylodes macrocephala, phyllanthus urinaria, cyrtomium fortunei, stellaria yunnanensis, oriental waterplantain rhizome, a phagostimulant and a proper amount of water. The feed disclosed by the invention is ingeniously designed and manufactured according to the nutritional requirements and the diet habits of the channa argus, is reasonable in match and sufficient in energy and is nutritional and healthy; the growth and the weight increment of the channa argus can be promoted and the channa argus can grow rapidly; and the growth period is shortened, the yield of the channa argus is increased and the economic benefits of channa argus aquaculture are increased.

The invention belongs to the technical field of aquaculture, and discloses a feed as well as a preparation method and application thereof. The feed comprises the following components: a camellia plant extract and additives, wherein the additives are composed of at least two selected from monocalcium phosphate, choline chloride, ethoxyquin, glutamine and N-carbamylglutamic acid. The feed also comprises an euphausia superba extract. The camellia plant extract and the additives are matched for use, so the prepared feed can remarkably improve the disease resistance and the survival rate of snakeheaded fish. The feed further contains the euphausia superba extract; the euphausia superba extract is rich in nutrient substances and further contains various active substances such as protein digestive enzymes, analogous mycotoxin amino acids and the like and has rich nutritional value; and as the euphausia superba extract is added into the prepared feed, the nutritional value of the feed can be effectively improved, the digestion function of the snakehead fish can be effectively promoted, and the rapid growth of the snakehead fish is thus facilitated.

The invention discloses purifying and quality-improving temporary rearing equipment for snakeheads and a production process. The purifying and quality-improving temporary rearing equipment for the snakeheads comprises a fish culture tank, a microfilter, a biological purification tank, an ultraviolet sterilizer and an oxygen supplementing and salt adjusting pond. According to the production process, the feeding quantity is gradually increased, so that a circulating water culture system has enough time to enable microorganisms to grow, fish excrement and residual feed in water are purified and treated, and the situations that a water treatment system runs in an overload mode, and ammonia nitrogen is increased are avoided; a feed feeding temporary rearing strategy of stopping feeding, feeding a small amount of feed and stopping feeding is adopted, so that the exercise amount of the snakeheads can be increased, the snakeheads are matched with relocation of fish bodies, a new environment is adapted, fat consumption is promoted, meat is compact, and the taste of the snakeheads is improved. According to the purifying and quality-improving temporary rearing equipment for the snakeheads and the production process, culture water is subjected to continuous microbial purification and ultraviolet disinfection strategies, so that the earthy smell in snakehead meat can be removed; by controlling the salinity of the culture water to be 2-3 per thousand, the sterilization effect on the fish bodies and the water can be achieved, the meat quality of the snakeheads can be more compact, and the taste of the snakeheads is improved.

The invention discloses a preparation method for puffed feed for snakeheads. The preparation method comprises the following steps: weighing ingredients according to the formula, mixing the weighed ingredients, crushing the mixed ingredients, and sieving the crushed ingredients 2-3 times according to the needs until the mixed ingredients can pass through a 100-mesh sieve; transferring raw material powder into a modulator, and introducing steam which accounts for 16-18% of raw material powder in mass to modulate; then, introducing the modulated raw material powder into an extruding, puffing and granulating machine for preparing feed granules; and drying the feed granules so as to obtain the finished product of the puffed feed. The puffed feed for snakeheads provided by the invention has excellent index performance, the feed coefficient is low, and snakeheads fed by the feed are healthy, better in constitutional health, and extremely high in survival rate. In addition, the snakehead fed with the puffed feed does not have hepatic pathological changes, and thus, the feed disclosed by the invention has an extremely good liver protecting effect.

The invention discloses a medicinal herb preparation for improving the meat quality and flavor of Weishan lake northern snakeheads. The medicinal herb preparation is characterized by being composed of, by weight, 5-8 parts of mint, 6-10 parts of cinnamon, 10-15 parts of astragalus, 6-10 parts of codonopsis pilosula, 8-12 parts of hawthorn, 3-6 parts of illicium verum, 3-6 parts of fennel, 2-5 parts of nutmeg, 6-10 parts of pericarpium citri reticulatae, 2-5 parts of chrysanthemum, 3-5 parts of clove, 5-8 parts of pepper, 5-8 parts of myrcia, 10-15 parts of liquorice, 8-12 parts of lycium barbarum, 6-10 parts of yam and 3-5 parts of lotus leaf. The traditional Chinese medicinal ingredients are ground and smashed respectively, are screened through a 60-mesh screen bolting-silk screen and are fully stirred and evenly mixed to form the medicinal herb preparation. The medicinal herb preparation can improve the meat quality and flavor of Weishan lake northern snakeheads, increase the amino acid content in fish meat and improve the deliciousness of the meat quality of the Weishan lake northern snakeheads, in addition, the gloss of fish bodies is bright, and the disease resistance capability is improved. Raw materials of additives of the traditional Chinese medicine are wide in source, functions are wide, safety is high, and benefits are remarkable.

The invention belongs to the technical field of biological extraction, and relates to a preparation method of a snakehead epidermal mucus antibacterial peptide. The preparation method comprises the following steps: collecting mucus of the back epidermis of snakeheads, heating in a water bath, cooling, centrifuging and collecting supernate; after pre-freezing, freeze-drying the supernate to obtain freeze-dried powder of the snakehead epidermal mucus; purifying the freeze-dried powder by adopting a Sephadex G-100 gel column, then collecting a product, detecting a light absorption value at 280 nm, collecting a component, and freeze-drying to obtain a freeze-dried component; and further purifying by adopting a cation exchange column, collecting a product, detecting a light absorption value at 280 nm, finally collecting a component, dialyzing, desalting and freeze-drying to obtain the snakehead epidermal mucus antibacterial peptide. The method is simple in process and relatively low in cost, has a good inhibition effect on gram-positive bacteria and gram-negative bacteria, has broad-spectrum antibacterial activity, can be used for preparing a fish preservative or a feed additive, and is beneficial to realizing high-value utilization of snakehead processing byproducts.

The invention discloses a method for breeding golden yellow snakeheads. Mutant genes of golden yellow snakehead individuals formed by body color variation are fixed in a continuous inbreeding manner;and breeding is performed after 3-4-generation breeding. The method comprises the steps of parent selection and breeding; population-closing sub-generation breeding, wherein the golden yellow individuals with the body color variation are positively and negatively mated with the snakeheads with the same variant body colors to breed paternal and maternal lines; selecting the golden yellow individuals from offsprings of the paternal and maternal lines to be mated, and taking the individuals with the consistent body colors as a new variety or a strain breeding 0 generation; adopting a random mating mode of avoiding sib mating for offsprings of the 0 generation, and selecting and remaining the male and female snakeheads with determination indexes meeting the seed selection requirements and theconsistent variant body colors as next generation parents; and carrying out expanding propagation and popularization. The method overcomes the defects of single and relatively black body color, smallpopulation, low fertilization rate, high death rate and weak disease resistance of existing common snakehead varieties; and a foundation is laid for future development of other new snakehead variety breeding, and materials are provided for body color related genetic engineering research.