294 results about "Bighead carp" patented technology

An efficient breeding method for crayfish in fresh water of a rice field is disclosed. The efficient breeding method for the crayfish in the fresh water of the rice field comprises the steps of: selecting the rice field which is sufficient in water source, convenient in irrigation and drainage, strong in water-retaining capacity, not dry when meeting with heavenly stems and not submerged by floods and has a good ecological environment, no pollution source around, fertile soil and a substrate natural structure; placing grass carp summer flower, bighead carp summer flower and field snails after the young crayfish is placed; filling decayed cow dung every half a month at a filling amount of 50-100 kg per each mu; checking submerged plant mow and filling aquatic plant every half a month; filling animal fodder such as fish meat and meat of spiral shells of 2-4 kg per each mu every week.

The invention is concerned with the freshwater dried fish products and preparation method, the compounding is: freshwater grass crap, salt, sugar, flavor essence, rice wine, ginger juice, water. The invention is good for disease of liver, kidney, brain, heart, which is without side effect.

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 wild-imitation breeding method for river eel. The method comprises the following steps: A, preparing for pond conditions and other work; B, stocking seeds, wherein the seeds include river eel, penaeus monodon, chub and bighead; C, feedstuff feeding; D, daily management: (1) aerating by adopting an aerator; (2) disinfecting a water body; (3) applying a microbial preparation; (4) changing water; (5) controlling diseases: preventing, controlling and treating diseases by using Chinese Herbal medicines; E, modifying an artificial wild-imitation environment. According to the method, river eel, penaeus monodon, chub and bighead are bred in a breeding pond in a mixed way, so that the stability of a breeding system can be improved; meanwhile, the water quality environment of the pond can be improved, and the breeding benefit of unit area is increased; a marine drug prepared by compounding natural Chinese herbal medicines has the advantages of natural property, multi-functionality, small toxic and side effects and no drug resistance, the quality of marine products is improved remarkably, and the immunologic functions of aquatic animals are improved.

An indoor-outdoor multi-crops polyculture method for shrimp, soft-shelled turtle and fish includes building an upper greenhouse culture pond and a lower outdoor intensive culture pond, and using a transfer pipe to communicate the upper greenhouse culture pond and the lower outdoor intensive culture pond; throwing desalted giant tiger prawn in the upper greenhouse culture pond in mid-March, and keeping water temperature at 25 DEG C; pouring water into the lower outdoor intensive culture pond prior to throwing in silver carp, bighead carp and Chinese soft-shelled turtle for breeding in early May; after seedlings grow to about 5cm 50-60 days after culture of the giant tiger prawn in the upper greenhouse culture pond, transferring young shrimps in the upper greenhouse culture pond into the lower outdoor intensive culture pond for breeding through the transfer pipe, harvesting first crop from late June to early July; and harvesting the silver carp, the bighead carp and the Chinese soft-shelled turtle in November to December after continuous three-crop culture of the giant tiger prawn. The indoor-outdoor multi-crops polyculture method for shrimp, soft-shelled turtle and fish breaks through the bottleneck of existing culture production and benefit.

The invention discloses a comprehensive maintaining method for submerged plants. The comprehensive maintaining method comprises the following steps that firstly, a flocculating agent is added into a water body with the quantity of 1-20 mg / l to reduce the turbidity of the water body; secondly, according to the specific circumstance of dirt attached to the submerged plants, a disinfecting agent or organic acid or pesticide or algicide or surfactant or a substrate modifying agent or a microbial agent or microorganism growth promoting liquid is added into the water body with the amount of 0.1-1 mg / l, and flow disturbance is artificially made; thirdly, a nutrition regulator or a heavy metal complex is applied in the growing stage of the submerged plants with the quantity of 0.2-1 mg / l; fourthly, plagiognathops microlepis or barbels are introduced into the water body with the quantity of 50-100 pieces per 666.7 m<2> to eat fixation algae, and chub or bighead carp are introduced with the quantity of 10-30 g / m<3> to eat planktonic single-spore algae. By means of the comprehensive treatment method, the ecology of the water body is balanced, the transparency of the water body is quickly increased so as to promote the growth of aquatic plants in the water body, dirt attached to the stems and leaves of the aquatic plants is quickly removed, and finally the purpose of long-acting cleaning of the stems and leaves of the aquatic plants and the effect of enhancing water ecological restoration are achieved.

The invention discloses a preparation method of a bighead carp biologic feed. The method comprises the following steps of: mixing fish meal, rapeseed meal and the like and complex enzyme, and inoculating compound strains to prepare the feed. A method for feeding the feed which is obtained by the method to bighead carp by using a mesh bag comprises the following steps of: 1) preparing the bighead carp feeding mesh bag, and filling the feed into the mesh bag; 2) stocking bighead carp fry in each acre of a fish pond; 3) fixing an appropriate mesh bag in water according to the size of the cultivation pond mouth; and 4) feeding according to time. The feed has the advantages that: the feed is rich in various nutrient substances which are required by bighead carp, improves the nutrient absorption rate, obviously improves immunity and premonition, automatically adjusts water quality, and is high in economic benefit and pollution-free. The feed method meets the feeding habit of touch feeding of the bighead carp, greatly increases the growth speed of the bighead carp, and can reduce the feed loss to the maximum extent, improve the feed efficiency, reduce the cultivation feed cost and is suitable for centralization cultivation of the bighead carp.

The invention relates to a method for culturing finless eel and freshwater crayfish in a pond, which includes (1) selecting pond or low-level pond, or opening ditches such as 'curve', 'well' or 'field' font, keeping sluice above 1.5m in the pond or ditch; (2) clearing and sterilizing the pond, keeping the water depth for 30cm, fertilizing and planting aquatic; (3)the net box of finless eel being an open style, planting water peanut in the box; (4) regulating water quality by stocking silver carp and bighead carp, putting healthy fingerlings of the freshwater crayfish one off in the last decades of April (100kg / 666m2), or putting mature fingerlings of the freshwater crayfish whose female and male ratio is 2:1 in the autumn; (5) stocking young finless eels from the last ten-day of April to the first ten-day of May or the last decades of July (1kg / m2); (6) feeding food per day, the amount of which are 5-8% of the weight of freshwater crayfish; (7)subduing feeds after young finless eels are put in the box and hungry for 3 days, the weight ratio of minced earthworm or fresh fish and finless eel is 5:1, 4:1, 3:1 and 2:1; (8) strengthening water quality management, fertilizing management and prophylaxis osamu work of the aquaculture water and inside the net box.

The invention discloses a specific molecular marker for acquiring the genders of bighead carps and a screening method and application thereof. The screening method comprises the following steps: firstly, performing reduced-representation sequencing on 5 female bighead carps and 5 male bighead carps by using a 2b-RAD technology to identify a male specific sequence; then, performing genome resequencing and genome assembly on one of the male bighead carps, comparatively searching 2b-RAD specific sequences of the male bighead carps in a male bighead carp genome to obtain a long-fragment male bighead carp specific sequence, and designing a male specific primer. By adopting the screening method, a male specific sequence and a gender specific primer of the bighead carps are screened for the first time, and a PCR (Polymerase Chain Reaction) technology for generic gender determination is built. The method has the advantages of low cost, easiness, rapidness and accuracy in operation, and the like, and a reliable technical measure is provided for the development of a gender marker and gender determination of the bighead carps. The method can be popularized and applied in gender marker development and gender determination research of other fishes.

The invention discloses a shrimp, crab and mandarin fish polyculture method, which includes pond construction, clearing and disinfection and shrimp seed stocking; pond construction means that an old pond is altered or a new pond is dug, so that the culture pond can come up to various indexes of standardized fish pond construction; clearing and disinfection mean that after old pond silt clearing, pond embankment leakage prevention and reinforcement, new / old fish pond escape-proof facility arrangement, pond insolation and other works, the whole pond is thoroughly disinfected; the quantity of stocked shrimp seeds is 10 kilograms of freshwater shrimps per mu, and the specification is 1000 to 1400 post-winter shrimp seeds per kilogram; the quantity of stocked silver carp seeds and bighead carp seeds is 30 to 50 per mu; the area of planted waterweeds is about 50 percent of the area of the pond; the quantity of migrated snails is 230 to 260 kilograms per mu; preferably, the quantity of stocked juvenile river crabs is 500 to 800 per mu; preferably, the quantity of stocked loaches is 350 to 450 per mu; and preferably, the quantity of stocked yellow catfishes is 250 to 350 per mu. The method covers the shrimp, crab and mandarin fish polyculture technique and the high-efficiency polyculture technique for a variety of fishes, and forms a unique feasible technical operation route, the polyculture mode is novel, the economic benefit is high, and the ecological environment is good.

The method for increasing commodity rate of breeding black shrimps in the invention includes selecting excellent seeds, postponing the time of shrimp postlarvae stocking properly and feeding some chubs, bighead carps, etc., controlling the coverage rate of float grass and the transparency of water, and making use of calces. When in the metaphase of breeding black shrimps, more particularly, when the black shrimps are in the propagation season of Autumn, the area of float grass is controlled to be 60-70% of the water area, the transparency is controlled to be 40-50cm. In the propagation season, when the color of oogenesis of shrimps becomes grey and transparent, or flea-shape larva is hatched out, calces of 10-20g per stere is used for spraying the whole pool within five days, then the method is used every week and is totally used for 7-10 times. By increasing the measures of controlling the coverage rate of float grass and the transparency of water and making use of calces, neoteny of black shrimps and over propagation are controlled, the growth of grown shrimps is promoted, and the commodity rate of black shrimps can reach 90% at the end of the year. The method of breeding black shrimps has the advantages of easy and convenient operation as well as easy popularization and use, etc., which is a good method for effectively increasing commodity rate of breeding black shrimps.

The invention relates to a penaeus vannamei boone low-salinity culturing method. During seed culturing, the salinity is 8 to 100%; in the phase of juvenile shrimps, the salinity of a culturing water body is increased to 6%; in the phase of middle-age shrimps, the salinity of the culturing water body is reduced to 4%; in the phase of adult shrimps, the salinity of the culturing water body is reduced to 2%. The method has the advantages that the secondary virus disease caused by the infection of pathogen of penaeus vannamei boone in seawater is avoided, meanwhile, the growth speed of the penaeus vannamei boone is ensured, and the economic benefit of a farmer is protected; by utilizing the habits of Chinese soft shell turtles, silver carps or bighead carps using planktons as foods, the amount of seaweed in water is controlled, so the water quality is improved, the waste at water body resources is avoided, and better economic benefits can be obtained.

The invention discloses a method for breeding crucian in a pond. The method comprises the steps of preprocessing of the pond, preparation before stocking, feed putting and feeding, health breeding management, moderate fishing and the like. The method for breeding crucian in the pond is convenient and easy to implement, low in breeding cost and high in output benefit. Through reasonable stocking of bighead carp, water is purified, the breeding quality of crucian is improved, and breeding benefits are increased.

The invention discloses a feed suitable for mixed raising mode of grass craps, silver carps and bighead carps on a large standard, which comprises the following components in percentage by weight: 3-8% of fish meal, 10-15% of bean meal, 10-15% of cotton meal, 17-22% of vegetable meal, 15-22% of rice bran, 15-20% of bran, 3-8% of rape seed, 3-8% of soybean, 0.3-0.8% of salt, 1-2% of calcium hydrophosphate, 1-2% of bentonite, and 0.8-1.5% of premix compound. In addition, the invention also provides a production method for the feed suitable for the mixed raising mode of grass craps, silver carpsand bighead carps on a large standard. Compared with the prior art, the feed suitable for the mixed raising mode of grass craps, silver carps and bighead carps on a large standard and the production method, which are provided by the invention, have the advantages that the adopted raw materials are low in cost, are easy to identify and have small possibility of counterfeit, thus the stability of the quality of the feed can be guaranteed to the maximum degree, grass carps on a large standard can be cultured, and the output of filter-feeding fishes is increased so as to improve the comprehensivebenefits of pond breeding.

The present invention relates to a method of cooperative control of alga in a water body comprising silver carp, bighead carp and cladophora, which relates to a water treatment method and solves the problem of high operating cost and much of the by-products of the current alga control method. In the present invention silver carp and bighead carp are cultured in eutrophication water body with a culturing density of 60~100 g / m<3>, a culturing ratio of 3:1~4:1 and a single weight of 60~200 g; a floating net cage is arranged in the eutrophication water body, which is an open net cage made from stainless wire net having an aperture of 4~6 mm and has a length*width*height size of 1~2m*1~2m*1~2m, besides, the four corners of the upper bottom of the floating net cage are provided with floater, by which the side walls of the floating net cage can overtop the water level by 0.2~0.4 m. The present invention is simple and easy, and can reduce the alga content and the trophic level in raw water of water plant effectively so as to solve the problem of that the eutrophication high algae-laden raw water affects the conventional treatment in current water plant, to reduce the cost and improve the water quality.

The invention discloses fodder for bighead carp and its preparing process, wherein the fodder comprises (by weight ratio) fish meal or meat and bones meal 5-6.5%, soybean waste 17-19%, groundnut meal 20.5-25.5%, rapeseed meal 9-10%, cotton seed meal 9-10%, rice bran 20-26%, cooking oil 2-3%, mixed vitamins 1%, mixed minerals 4% and addition agent 1%. The preparing process consists of steps disintegrating, passing through 40 mesh sieves, mixing homogeneously, palletizing, squashing and packaging.

The invention relates to a processing method of smoking cultured fish products, which comprises the procedures of scale removal, killing, washing, draining, pickling, flavoring, rinsing, drying, smoking, cooling, dicing, packing and sterilizing. Wood dust or rice bran solid smoking materials are used for carrying out smoking and ready-to-eat smoking dry and cooked products are obtained. The invention is applicable to artificial cultured freshwater fishes such as herring, grass carp, chub, oxtail fish, bream fish and tilapia fish and also is applicable to artificial cultured seawater fishes such as large yellow croaker, American red fish, weever and mullet. Therefore, the invention broadens the variety of fishes that are used for smoking products and the variety of smoking products; meanwhile, the invention has low processing cost and simple operation and can be applied practically.

The invention discloses a freshwater shrimp ecological pond culture system. The system comprises a freshwater shrimp culture pond, an aquatic economic plant planting region and a silver carp and bighead carp culture pond, which are arranged in sequence and are communicated with each other, wherein an artificial shrimp nest is arranged in the freshwater shrimp culture pond and is used for stocking freshwater shrimps; houttuynia cordata and water spinaches are planted in the aquatic economic plant planting region; the silver carp and bighead carp culture pond are used for stocking silver carps and bighead carps; pond water circulates among the freshwater shrimp culture pond, the silver carp and bighead carp culture pond, the aquatic economic plant planting region and the freshwater shrimp culture pond. The system has the beneficial effects that the stocking density is improved by arranging the artificial shrimp nest; the freshwater shrimp culture pond water after culture provides baits for the silver carps and the bighead carps and provides nutrients for aquatic economic plants, thus the water is purified and flows into the freshwater shrimp culture pond again; under the condition of the same culture area, the freshwater shrimp yield is increased by 3-4 times and the yields of the silver carps and the bighead carps and the aquatic economic plants are substantially increased, and the drug dose is greatly reduced or even drugs are not used, thus achieving efficient ecological culture of freshwater shrimps.

A biological phosphorus-controlling and phosphorus-removing method used in the eutrophic lake internal pollution comprises the following steps: (1) filter-feeding fishes are put in a lake or reservoir to be treated to breed, the aim of controlling the internal phosphorus of a water body can be realized by utilizing different utilization efficiencies of the filter-feeding fishes to nitrogen and phosphorus in the water body; (2) when the filter-feeding fishes are bred, the number of ferocious fishes is controlled to ensure the survival rate of the bred filter-feeding fishes and increase the breeding efficiency and effect, wherein the filter-feeding fishes are silver carp and bighead carp, the ferocious fishes are Elopichthys bambusa, Culter alburnus and Culter mongolicus and the survival rate of the bred filter-feeding fishes is no less than 70%; and (3) fishes which eats organic detritus is bred at the bottom when the bottom has no fish to eat organic detritus to ensure that the biomass is no less than 1-10g / m<3>, wherein the bred or propagated fishes eating organic detritus are Xenocypris microlepis or crucian carp.

The invention belongs to the field of pond culture, and relates to a pond efficient ecological polyculture method suitable for grass carps, chubs, bighead carps, paddlefish and crucian carps. The method comprises the steps of: 1) filling fresh water after 1 week after preparation and disinfection of a pond and carrying out probationary culture of chub till the chub survives; 2) stocking 150g of grass carp, 100g of chub, 100g of bighead carp, 150g of paddlefish and 60g of crucian carp at one time, wherein the polyculture proportion is that grass carps account for 75%, chubs account for 8%, bighead carps account for 6%, paddlefish account for 6% and crucian carps account for 5%, and the average culture density is 3 / sq.cm; 3) feeding twice a day, wherein the total feeding weight per day accounts for 5% of total weight of grass carps in the pond, the feed is polyculture fish seed particle matched feed, and the time of manual feeding begins from the time when the fish seeds are cast to 210 days; 4) adding 20cm of fresh water into the pond every week; maintaining the water quality at pH 7.5-8.5, temperature at 20.0-31.0 DEG C, nonionic ammonia smaller than or equal to 0.02mg / L, total alkalinity 1.00-2.00mmol / L, dissolved oxygen greater than or equal to 5.0mg / L, transparency 28-32cm, chemical oxygen consumption smaller than or equal to 15mg / L, biochemical oxygen demand smaller than or equal to 5mg / L and total escherichia coli smaller than 5000 / L for 210 days. The average fish yield in the middle and lower reaches of the Yangtze River can reach 1000kg / 667 sq.cm.

The invention discloses a method of cultivating silver carps and bighead carps with organic fertilizer coordinated with biological fish fertilizer. The method includes the steps that: (1) preparation of the organic fertilizer: A. Raw materials of the organic fertilizer are prepared: main materials, conditioners, fungicide and auxiliary agents; B. firstly, the conditioners are added to excrement of poultry and / or livestock, moisture humidity of the excrement is adjusted, then the auxiliary agents and the fungicide are added and mixed uniformly, and then mixture is stacked on a hardened ground or the mixture is placed in a fermentation machine for fermentation; C. the stacks are turned one time every day when the stacking temperature is above 50 DEG C, and thus the organic fertilizer can be obtained through fermentation and decay in 7-10 days; D. the decayed organic fertilizer is air dried, and thus the water content is lower than 30%, the decayed organic fertilizer is ground and packaged, and thus a finished product is obtained. (2) The stocking of the silver carps and the bighead carps is carried out. (3) Cultivation fertilization management and daily management are carried out. The method of cultivating the silver carps and the bighead carps with the organic fertilizer coordinated with the biological fish fertilizer has the advantages of being simple, easy to carry out, low in cost, good in economic benefit, economical and environment-friendly and scientific in waste using. The living environment of the bighead carps is improved and occurrence of diseases of the bighead carps is reduced.

The invention discloses a pool polyculture method for tor brevifilis, flying carps and bighead carps. The pool polyculture method comprises the following steps of selecting a polyculture pool; neatening the polyculture pool; fertilization: applying fermented chicken droppings as a base fertilizer, topdressing EM bacterium and unicellular alga activin after 3-4 days, and adding urea and calcium superphosphate; putting: in January, disinfecting with quick lime and putting flying carps and bighead carps after 12-18 days, wherein the density of the flying carps is 90-110 fishes / mu and the density of the bighead carps is 45-55 fishes / mu; in the first ten days of June, putting the tor brevifilis, the density of the tor brevifilis is 3200-3700 fishes / mu; feeding and management: feeding the granulated feed accounting for 4-7wt% of the weight of the tor brevifilis; water quality management: changing and adding water and using a microbial preparation in the feeding process; disease control: disinfecting with quick lime at intervals of 15 days; from the start of July, killing pests by adopting o, o-dimethyl (2, 2, 2-trichlorine-1-hydroxy ethyl) phosphonate, and adding allicin and isatis root in the fed feed; daily management.

The invention discloses a method for feeding crayfishes by nano feeds. The method comprises the following steps: putting juvenile prawns into a paddy field with the characteristics of sufficient water source, convenience in irrigation and drainage, good water retention capability, non drought in dry weather, no flooding, good ecological environment, no pollution source, fertile soil and natural substrate, and then putting grass carp summer flowers, bighead carp summer flowers, snails and the like into the paddy field. By adding a compound microorganism fertilizer, the crayfishes can be promoted to grow quickly, the EPA (eicosapentaenoic acid) content can be increased, the diseases of the crayfishes are reduced, the fatality rate is reduced, beneficial microorganisms in a water body are added, and the final quality is improved.

The invention relates to the technical field of bulk fresh water fish culture, and provides a salinization weight-reducing bighead carp culture method. Selected bighead carps are subjected to pond recuperation and salinization culture, and the bighead carps discharge vivotoxin while swimming by the aid of flowing water so as to remove redundant fat; the bighead carps with weight reduced are subjected to salinization culture with appropriate salinity, harvested bighead carps are good in meat quality, delicious and high in economic value, and cultured bighead carps are bright in body color, strong, free of muddy taste, less in fat and chemical residue, good in taste and high in quality.

The invention discloses a puffed compound feed for bighead carp and a preparation method for the puffed compound feed. The feed consists of the following components in percentage by weight: 0.0003 to 0.0075 percent of ferrous sulfate, 0.00003 to 0.00025 percent of anhydrous cupric sulfate, 0.0002 to 0.002 percent of zinc sulfate, 0.0002 to 0.0004 percent of vitamin A, 0.0001 to 0.0004 percent of vitamin D, 0.5 to 2 percent of calcium dihydrogen phosphate, 15 to 25 percent of bean pulp, 3 to 10 percent of fish meal, 5 to 8 percent of rapeseed meal, 10 to 15 percent of peanut meal, 0.2 to 0.5 percent of cake modifier and flour added till the whole weight percentage is 100 percent. By using the raw materials such as fish meal, high-quality bean pulp and the like in the puffed compound feed, the nutrition required by the fish is met, and the fish is more healthy; and the cake modifier for making the feed fluffy and crisp is added and puffing processing is performed, so that the feed is loose, easily scattered and convenient to ingest, and the waste can be reduced.

The invention relates to a method for removing algae by series connection of zooplankton and filter-feeding fish, which relates to a method for controlling the removal of algae in eutrophic water. The invention can solve the problem that the algae in natural water can not be completely removed by utilizing aquatic organisms. The method of the invention is that first, at least two sluice facilities are connected with each other in series; then, the algae-containing water sequentially flows through every sluice facility; the hydraulic retention time of every sluice facility is one to three days; the zooplankton and the filter-feeding fish are alternatively stocked in the two neighboring sluice facilities; the stocked zooplankton are mainly daphnia magna which eats micro algae; at the same time, all the fishes in the sluice facility which stocks the zooplankton are completely cleaned out or predatory fishes are threw in; the stocked fishes in the sluice facility which stocks filter-feeding fishes are silver carp and bighead carp or only the silver carp is stocked. The stocking density of the silver carp is 40 to 200g / m<3>; every single silver carp weighs 60 to 500 grams; the stocking density ratio of the bighead carp and the silver carp is 1:3 to 1:5; every single bighead carp weighs 60 to 500 grams. The method of the invention can completely remove the algae in the natural water.

The invention relates to a bighead carp feed and a preparation method thereof. The bighead carp feed comprises the following main raw materials and rough components: 10-12% of soy bean meal, 15-18% of cottonseed meal, 18-22% of rapeseed meal, 20% of wheat middlings, 15% of oil bran, 5% of imported fish meal, 2% of monocalcium phosphate, 2% of compound premix, 1-2.5% of plant oil and 5-10% of other raw materials (bentonite, zeolite powder and the like) playing a role of filling. The preparation method comprises the steps of ultramicro grinding, preparing, blending, extruding and cooling and mixing. The bighead carp feed has the following characteristics: the grinding fineness is good, the sinking speed is low, the bighead carp utilization ratio is high, the fish school growth speed is high, the cultured bighead carp has shape, color and mouthfeel the same as the bighead carps in the natural water body and has excellent quality, and the bighead carp feed can effectively improve the culture benefits and simultaneously conforms to the requirements for ecologically healthy culture and environmental protection.

The invention discloses an artificial compound feed for perca fluviatilis. The artificial compound feed comprises the following components in percentage by weight: 8.0 to 51.5 percent of fish meal, 1.00 percent of fish oil, 1.00 percent of corn oil, 0.24 percent of choline chloride, 1.1 percent of vitamin premix, 1.9 percent of inorganic salt premix, 0.55 percent of calcium dihydrogen phosphate, 0.18 percent of lysine, 0.45 percent of methionine, 8.2 to 15.46 percent of bran, 21.2 to 26.6 percent of wheat middling, 6.01 to 12.82 percent of rapeseed dregs, 0.88 to 2.65 percent of globin powder, 14.87 to 16.79 percent of bean pulp, 10.23 to 12.47 percent of cottonseed pulp and 2.5 to 5.8 percent of yeast; and the components are puffed into a floating granular feed by a conventional method. The invention also discloses a perca fluviatilis feeding method. According to a culture mode of mainly feeding the perca fluviatilis and matching carp, bighead carp, silver carp, tincaeus, grass carp and pelteobagrus fulvidraco Richardson, the perca fluviatilis can be completely domesticated to take the compound feed in 7 to 15 days by adopting the compound feed and a unique intake domesticating method; the feed problem is solved, the water layer and the bait resource of a culture water area are fully utilized, and the growth speed and the yield of the perca fluviatilis are improved; and the compound feed can be used for large-scale culture of the perca fluviatilis.

The invention belongs to the technical field of the aquaculture feed and discloses a special slow sinking type feed for bighead. The slow sinking type feed comprises the following raw materials in percentage by weight: 25-35% of wheat flour, 0.5-9% of soya bean meal, 0-38% of casein, 8-10% of cottonseed meal, 8-12% of white fish meal, 1-2% of mineral premix, 1-3% of vitamin premix, 3-9% of soybean oil, 0.1-0.5% of choline chloride, 0.1-0.5% of salt, 2-3% of monocalcium phosphate, 0.05-0.2% of VC-lipid and 0.1-27% of cellulose powder. By researching the life habits of the bighead and the requirement amount of nutrient substances such as protein in the growth process, the slow sinking type feed applicable to bighead is researched; the slow sinking type feed is capable of promoting the growth of the bighead, facilitating the deposition of the ribosomal protein and facilitating the secretion of digestive enzymes in the enteric canal; after the slow sinking type feed is popularized, the slow sinking type feed has great social significance and economic significance.

The invention relates to a crocodile ecological-breeding method which is characterized in that a crocodile ecological-breeding base comprises a crocodile breeding pond (1) and a water purification pond (2), the crocodile breeding pond (1) is positioned at the periphery, the water purification pond (2) is positioned in the middle, the water body of the crocodile breeding pond (1) and the water body of the water purification pond (2) can mutually exchange, the area of each pool of the crocodile breeding pond (1) is 3 to 8 Mu, and daffodils and water lettuces are planted in the water purification pond (2) and white carp, bighead carp and Tilapia fishes are cultivated in the water purification pond (2), so as to purify the water bodies. The water in the crocodile breeding pond (1) can be changed by water pumped from the water purification pond (2) instead of external water sources, to achieve the purpose of water change. The meat of the bred crocodile is delicious, slight-sweet and tasty, conforms to the quarantine standards and the food hygiene and safety standards, meets the requirements for international pollution-free foods, and is a completely green food. Besides, the crocodiles grow fast, the yield is increased, and the economic benefit is improved.