95 results about "Fish larvae" patented technology

Larviculture is performed using Parvocalanus sp as a feed for fish larvae. A system is described using tanks for growing Parvocalanus sp nauplii with a microalgae feed and transferring the grown Parvocalanus sp nauplii to tanks containing the fish larvae, where the functions of the tanks is interchanged. The Parvocalanus sp feed provide for higher numbers of larger juvenile fish and the rearing of larvae heretofore not reared in culture.

Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel. These structures include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. One or more circulating or sweep flow pumps are positioned proximate an outlet of the outflow channel. The sweep flow pumps are used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel. The screens are provided in multiple embodiments to include symmetrical shaped bars or wires, and asymmetric shaped bars or wires. One configuration of the asymmetric shaped bars or wires includes a trailing edge protrusion that creates centrifugal forces in the flow of water to enhance separation of particles from the water stream.

The invention relates to a freshwater shrimp cultivation method, in particular to a pollution-free freshwater shrimp cultivation method according to which hybridization is adopted and fish larvae are matched for cultivation together. The pollution-free freshwater shrimp cultivation method includes the following steps of shrimp pond requirements, shrimp pond treatment, hybridization, shrimp larvae breeding, feeing management, water quality management and density control. The pollution-free freshwater shrimp cultivation method makes the most of idle resources for production, standardizes cultivation techniques, and obtains high-quality offspring seeds for cultivation after Lake Taihu youth shimps and local shrimps are hybridized; moreover, when a second generation of freshwater shrimps are reproduced, the fish larvae are bred, on the one hand, small shrimp larvae can be used as feed of the fish larvae, and on the other hand, space is saved by the small shrimp larvae which are eaten and oxygen consumption is reduced, and therefore unified specifications and high output of the freshwater shrimps are ensured.

The invention relates to a device and a method for recovering and rebuilding spawning sites of fishes in natural waters. The device comprises a box body frame, float bowls, brackets, fixing rings and fish egg attachment matrixes, wherein the box body frame is a cuboid or cube structure, and two edges, which are parallel to each other, on the upper surface of the box body frame are sleeved by one float bowl respectively; the upper surface and the lower surface of the box body frame are fixedly provided with a plurality of brackets, and the brackets are sleeved by a plurality of fixing rings; the fixing rings are connected with the fish egg attachment matrixes; four top corners of the upper surface of the box body frame are connected with an anchor rope respectively; and the device is fixed in waters where the spawning sites of fishes require to be recovered and rebuilt by a bamboo anchor. By the device and the method provided by the invention, a spawning shelter and the fish egg attachment matrixes are provided for fishes, and simultaneously the fish egg attachment matrixes also provide habitats for various bait organism communities, so that the density of bait organisms is improved, the bait supply for fish larvae is guaranteed, the aim of recovering and rebuilding spawning sites of fishes is achieved, and the manual-work spawning sites of fishes formed by the device and the method can automatically rise or drop along with the change of the water level.

The invention discloses a method for hybridizing female verasper variegatus and male verasper moseri for breeding and fry cultivating, comprising the steps of selection of parents, parent fish cultivation and reproduction control, artificial insemination and incubation and cultivation of fish larvae and juvenile fish, wherein female verasper variegatus older than 3 years is selected to be used as a female parent, and male verasper moseri older than 2 years is selected to be used as a male parent; and the sexual maturity synchronization of the female parent fish and the male parent fish is promoted by means of temperature control, light control and nutrition enhancement. With respect to the artificial insemination, the insemination rate reaches 50%; the water temperature for incubation is (10+/-0.5) DEG C, fish larvae can be incubated from inseminated eggs after 160 hours, and the incubation rate reaches more than 50%; and with respect to a feed series, L-type brachionus plicatilis and chlorella sp., artemia nauplii, and compound feed are respectively applied in different stages. The fish larvae (1-35 days in age) in an early stage are cultivated in a small water body (3m<3>) at the water temperature of (10+/-0.5) DEG C; after 3 days, the temperature is raised by 0.5 DEG C every 2 days and is kept unchanged after reaching (15+/-0.5) DEG C; and the fish larvae in a later stage are cultivated in a water body (30m<3>). After cultivating for 80 days, the survival rate of the fish larvae growing into the juvenile fish of 30mm in average is 20%. The method disclosed by the invention can be used for cultivating novel breeds and realizing scale breed reproduction.

The invention discloses a multi-flavor fish larva serial food preparation technology. The multi-flavor fish larva serial food preparation technology comprises the following steps: selecting fresh water fish larvae and fish, which come from markets of Thailand, Vietnam or China and have the specifications of 3-5 and 4-6 kilograms above, as main materials; screening, removing residues, removing internal impurities, rinsing three times, airing, frying until the fish larvae and fish are cooked, marinating, airing, blending with ingredients, and immersing, wherein the ingredients comprise spicy and hot fish larva ingredients, rod-chilli-flavor fish larva ingredients and sauce-juice-flavor fish larva ingredients; packaging in vacuum after immersion, carrying out drying disinfection and high-temperature sterilization or ultraviolet sterilization, boxing, checking, putting in storage, and carrying out casual inspection and delivery. A multi-flavor fish larva serial food provided by the invention has no preservation and chemical additive, is a pure environment-friendly healthy food, is spicy and fresh in flavor, is convenient to carry, is edible instantly without limitation of time, place and condition, and meets requirements of different industries and consuming groups.

The invention belongs to the field of fish larvae cultivation, and particularly relates to an application of fishery electrochemical water in transporting fish larvae of tilapia mossambica. The safe and environment-friendly fishery electrochemical water, which is without any pollution, bacteria, algae and insects, is used for transporting the fish larvae, and is used for transporting the famous fish larvae, such as the tilapia mossambica, so that the transportation survival rate and quality of the fish larvae can be effectively improved, the transportation time is beneficially prolonged, and the transportation capability is beneficially improved. The application and a method provided by the invention are simple and convenient in operation, become effective quickly, and have a wide application prospect.

The invention relates to a symphodon discus breeding and fish larvae culturing method. The method includes the stages of fish larvae culturing, juvenile fish culturing and artificial bait culturing. By means of control of the variety of fed biological bait, feeding times, feeding time and water body culture conditions of a parent fish egg laying vat and a juvenile fish culture vat, requirements of fish larvae growth for water quality and nutrition can be effectively met, the survival rate of the fish larvae is improved, quick growth of the fish larvae is promoted and economic efficiency is increased.

The invention discloses a phagostimulant for fish larvae and juveniles of spotted maigre and a preparation method thereof. The phagostimulant comprises the following compositions in portion by weight: 0.05 to 0.1 portion of dimethyl-beta- propionic acid thetine, 0.1 to 0.2 portion of kanirin, 0.1 to 0.3 portion of glycine trimethylpropyl, 20 to 30 portions of inosinic acid, 25 to 35 portions of clamworm extracting solution, 1 to 5 portions of betaine, 10 to 15 portions of lactamine, 8 to 10 portions of glycin, 26 to 28 portions of internal organ powder of cuttlefish, and 1 to 3 portions of lycopene. The preparation method of the phagostimulant comprises the following steps: raw materials are weighed according to weight portions and are mixed, and then the clamworm extracting solution produced by the mixing extraction of alcohol is added into the mixture. The phagostimulant has the advantages that the phagostimulant has small using amount, apparent effect, steady sources, low price, and simple production technology, can effectively improve survival rate, reduce the waste of baits, can also improve the high temperature resistance and the anti-anoxia ability of fish, strengthen the endurance of the fish to the change of water environment, and can improve the meat quality of breed varieties.

An efficient cultivation method of a turbot family offspring comprises the following steps: parent fish selection, parent fish cultivation, artificial directional mating, hatching, offspring cultivation and getting of commercial offsprings. The parent fish is selected from germplasm parent fish of different batches from different countries; artificial fertilization is performed among different germplasm parent fish, and the same batch of the parent fish are not allowed to mate with each other; offspring cultivation is as follows: at the early period, the adopted facility is a 3m glass reinforced plastics barrel, and bait comprises chlorella, rotifer and artemia; at the middle period, the adopted facility is a 10m cement pond, and the bait is micro pellet bait; at the later period, the adopted facility is a 20-30m cement pond, and the bait is fish larvae pellet bait; and specification of the commercial offsprings is 5-6cm. The method is characterized by adopting the parent fish with different germplasm resources for the artificial directional mating, and seriously controlling inbreeding; and adopting different culturing facilities to cultivate the offspring by three stages, which causes the offspring emergence rate of the commercial offspring to reach 46.8%, and improves growth rate thereof by 36%, and lowers of etiolation rate thereof below 5%. The method can efficiently produce high-quality turbot offsprings, and is applicable to large-scale production.

The invention discloses wheat grain fishing bait. The wheat grain fishing bait is composed of wheat grains, medicinal liquor and a soak solution. The wheat grains are mixed with the medicinal liquor and soaked for 5-30 days under the environment that the room temperature ranges from 15 DEG C to 30 DEG C; the well soaked wheat grains are taken out and dried; the dried wheat grains are placed in the soak solution which is stirred evenly, the ratio of the dried wheat grains to the soak solution is 1:1, the dried wheat grains and the soak solution are mixed and stand for 2-4 days, and the wheat grain fishing bait can be used. The manufacturing method of the wheat grain fishing bait is easy and convenient to implement; the wheat grain fishing bait is soaked in the medicinal liquor and the soak solution respectively, so that the wheat grain fishing bait not only has a cereal wine smell, but also has a fishy smell; a series of nutritional components which are necessary during a fish growing period is added to the wheat grain fishing bait, so that the overall fish inducting effect of the wheat grain fishing bait is ideal, and the wheat grain fishing bait is widely applied to more objects. Meanwhile, because the wheat grains are provided with specific tough skin, small trash fish can be effectively prevented from scrambling for the wheat grain fishing bait, and the phenomenon that small fish larvae are caught by mistakenly eating the wheat grain fishing bait can be effectively prevented.

Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel These structures may include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. These structures may further include one or more circulating or sweep flow pumps positioned proximate an outlet of the outflow channel. The sweep flow pumps may be used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel.

The invention discloses an ecological and environment-friendly industrial aquaculture method for odontobutis potamophila; the method comprises the steps: (1) site selection; (2) construction of farm rooms and subsidiary rooms; (3) construction of a source water purification system; (4) construction of a sewage circulation treatment system; (5) construction of parental fish and spawning ponds; (6) construction of fish larvae and mature fish ponds; (7) sterilization and disinfection treatment; (8) feed management of parental fishes; (9) feed management of fish larvae and mature fishes; (10) pest control; and (11) catching. The ecological and environment-friendly industrial aquaculture method for odontobutis potamophila has the beneficial effects: the aquaculture method is scientific; the aquaculture quality and the yield can be improved effectively; with adoption of the efficient source water purification system and the sewage circulation treatment system, the source water can be purified effectively, the aquaculture sewage can be treated efficiently and rationally and the sewage is treated completely; and the ecological and environment-friendly industrial aquaculture method has no pollution to the environment and is applicable to large-scale industrial aquaculture.

The invention discloses a marble goby starter feed and a preparation method thereof. The feed is prepared from, by mass, 20-50% of fish meal, 3-10% of shrimp shell meal, 3-10% of yeast, 10-30% of sandworms, 5-15% of sleeve-fish meal, 5-15% of spirulina, 15-30% of flour, 1-5% of soya-bean oil, 1-3% of phospholipid, 1-3% of glycine betaine, 1-2% of vitamin mixture, 2-4% of mineral element mixture, 1-5% of casein, 1-5% of compound exogenous enzyme preparation, 1-5% of microbial preparation and 1-2% of phagostimulant. The feed is designed and developed aiming at the nutritional demand law of marble goby fry, the particle size conforms to the high demand of marble goby fry culture, the feed attractiveness is high, the digestible absorptivity is high, the initial feeding rate and the immunity level can be remarkably strengthened, health growth of the fry is effectively promoted, and the survival rate of fish larvae is remarkably improved.

The invention discloses a natural reeves shad breeding method, which includes the following steps: building of a culture system; parent fish rearing and nutrition fortification; setting of laying nests; laying and fertilized egg collection; hatch of fertilized eggs; fish larva rearing; fry rearing. The natural reeves shad breeding method described by the invention has the advantages that obtained fries are well-developed, and have strong constitutions, moreover, eggs and parent fishes cannot be injured during laying, the fertilization rate of eggs is high, and the survival rate of fish larvae is greatly increased.

The invention provides an indoor cement-pool artificial breeding method for oplegnathus punctatus. The method comprises the following steps: (1) water-quality regulation and control: before hatched fish larvae are put, adding an EM probiotic preparation and natural alga cultivating pool water into a pool in each day; (2) pool entry: before the hatched fish larvae are put, distributing air stone ina transverse H manner, and putting the fish larvae in the pool, wherein the putting density is 13000-15000 fish larvae per cubic meter; (3) feeding management: feeding the fish larvae which are 20-40days old with baits including copepods and living mysis, and feeding the fish larvae which are over 30 days old with microencapsulated opening baits; (4) water change and illumination management: after the fish larvae are fed for 30-49 days, replacing water with 100%-150% of filtered seawater, and carrying out indoor illumination on the fish larvae which are 20-35 days old at 2500x-30001x, so asto realize light induced food intake; and (5) larvae outputting: transferring the larvae into a maritime net cage for breeding. According to the indoor cement-pool artificial breeding method, the growth quality of the fish larvae is improved, the death rate of the fish larvae is decreased, stress reaction of the fish larvae on a net cage breeding environment is reduced, and the survival rate of adult fish is increased.

The invention relates to a breeding method for increasing survival rate of fish larvae. The method specifically comprises the following steps: (S1) putting the fish larvae into a soil pond, then, carrying out feeding for 3 times separately in the morning and afternoon according to the daily feeding amount of 18g to 22g of rotifers per ten-thousands of fish larvae, and carrying out feeding at the interval of 1 hour for 7 continuous days; (S2) from the eighth day, increasing 10% to 15% of Copepoda every day so as to gradually replace the rotifers until the rotifers are completely replaced, and carrying out feeding according to the daily feeding amount of 30g to 50g of the Copepoda per ten-thousands of the fish larvae at the feeding times and time interval in the step (S1); (S3) after the body length of each fish fry is greater than 1.5cm, increasing 10% to 15% of powdery seawater fish feed every 3 days so as to gradually replace the Copepoda until the Copepoda is completely replaced, and carrying out feeding according to the daily feeding amount of 50g to 80g of the powdery seawater fish feed per ten-thousands of the fish fries at the feeding times and time interval in the step (S1); and (S4) after the body length of each fish fry is greater than 2.5cm, increasing 10% to 15% of zero feed every day so as to gradually replace the powdery seawater fish feed until the powdery seawater fish feed is completely replaced, and carrying out feeding according to the daily feeding amount of 80g to 100g of the zero feed per ten-thousands of the fish fries at the feeding times and time interval in the step (S1).

The invention discloses a portable fish larvae fluorescent capture device, which comprises a floater, a top plate, a main container, a fluorescent rod, a fluorescent rod protective tube, a bottom plate, a hopper, weights and a nylon rope, wherein same corner holes are dilled at corresponding corners of the floater and the top plate; the floater and the top plate are connected through the nylon rope; the center of the top plate is drilled to form a fluorescent rod protective tube inserting hole; the upper end of an organic glass cylinder is adhered below the top plate and the lower end of the organic glass cylinder is adhered on the bottom plate; gaps are reserved between adjacent cylinders; soft pricker bars are adhered along edges of the gaps; any two opposite angles of the bottom plate are drilled to form weight connecting holes; the upper end of the external threads of the hopper is adhered to the periphery of a center hole of the bottom plate on the lower part of the bottom plate;and the lower end of the internal threads of the hopper is plugged by a hopper plug covered with a mesh to seal the bottom. The capture device is reasonable in structure, easy to manufacture, low in cost and convenient to use, and is particularly suitable for collecting fish larvae in different water depths and complicated aquatic habitat water during scientific research.

The invention discloses a seedling method of big salangid in northern saline-alkaline areas. The method comprises the steps of solution preparation, parent fish selection, artificial insemination, artificial incubation, incubation management and the like. Water body salinity and alkalinity in the step of artificial incubation can be gradually improved by the method naturalizing step by step from fertilized eggs of the big salangid, ecological plasticity of the fertilized eggs of the big salangid is utilized to improve the adaptability of fish larvae after seedling emergence to the saline-alkaline water body quality and thus improve the transplanting success rate of big salangid in northern high saline-alkaline water body. The big salangid offspring seed cultivated by the method provided by the invention is applied to the transplanting of big salangid in northern low-temperature environment and high saline-alkaline water body. The method is simple to operate and can improve the transplanting success rate of the big salangid in water bodies such as lakes and reservoirs of saline-alkaline areas and well improve the fishery economic benefit of the saline-alkaline water body.

The invention discloses marine fish larva microparticle diet and a preparation method thereof. The marine fish larva microparticle diet comprises, by weight of 1000 kilograms, 255-335 kilograms of euphausia superba powder, 105-145 kilograms of egg albumen powder, 100-120 kilograms of white fish meal, 10-30 kilograms of yellow insect powder, 165 kilograms of alpha-starch, 125 kilograms of soy protein concentrate, 50 kilograms of vital gluten, 35 kilograms of fish oil, 20 kilograms of phosphatide oil, 18 kilograms of monocalcium phosphate, 5.0 kilograms of fish trace elements, 2.5 kilograms of choline, 2.0 kilograms of glycine betaine, 23.2 kilograms of bentonite, 1.0 kilogram of fish multi vitamin, 1.0 kilogram of mildew preventives, 1.0 kilogram of vitamin C, 0.5 kilogram of carnitine, 0.5 kilogram of antioxidants and 0.3 kilogram of inositol. The marine fish larva microparticle diet is low in production cost, stable in yield and quality, high in survival rate of fish larvae, and capable of fully replacing organism food in the breeding process of the marine fish larvae.

The invention discloses a method for detecting the toxicity of aflatoxin B1. The method comprises the following steps: preparing culture solutions with different aflatoxin B1 concentrations; culturing zebra fish embryos by virtue of the culture solutions with different aflatoxin B1 concentrations for 24-120 hours; and observing the death rate of the zebra fish embryos and the hatching rate, malformation rate, areas of heart cysts and yolk sacs and areas of fish larvae of young zebra fish hatched from the zebra fish embryos, calculating a heart cyst/larva area ratio and yolk sac/larva area ratio, and judging the toxicity effect of the aflatoxin B1 to the zebra fish embryos. According to the method, the aflatoxin B1 is detected by taking zebra fishes as an experiment object, so that a large number of experimental animals with good homogeneity can be rapidly obtained, the experiment cost is lowered, the toxic symptom can be easily observed, the pathological change of each tissue of the fish body can be visually observed in real time, and the detection efficiency, visuality and accuracy of the aflatoxin B1 are improved.