74 results about "Fish stock" patented technology

This invention provides a vessel system and methodology that can be used to promote growth of phytoplankton in the oceans. Unmanned self-controlled wave-powered vessels are equipped with storage units for dispensing a fertilizer, and with sensors to monitor ocean conditions and effects. Fleets of vessels move autonomously by on-board processing of GPS and directional information, piloting a path that is coordinated by a central processing unit. The vessels travel through a defined target area, creating a detailed survey of chemical and biological characteristics that affect grown. The data are processed in a computer model to identify precise locations and precise amounts of fertilizer that will produce the best results. Projected benefits of fertilizing plankton include sequestering CO2 from the atmosphere, and enhancing the marine food chain to improve the fish stock in and around the treated area.

This invention provides a vessel system and methodology that can be used to promote growth of phytoplankton in the oceans. Unmanned self-controlled wave-powered vessels are equipped with storage units for dispensing a fertilizer, and with sensors to monitor ocean conditions and effects. Fleets of vessels move autonomously by on-board processing of GPS and directional information, piloting a path that is coordinated by a central processing unit. The vessels travel through a defined target area, creating a detailed survey of chemical and biological characteristics that affect grown. The data are processed in a computer model to identify precise locations and precise amounts of fertilizer that will produce the best results. Projected benefits of fertilizing plankton include sequestering CO2 from the atmosphere, and enhancing the marine food chain to improve the fish stock in and around the treated area.

A fish allogenous frozen-sperm induced gynogenesis method comprises a frozen storage method of the allogenous fish sperm, a genetic inactivation method, an induced method for the gynogenesis diploid fry and an identification method for the gynogenesis fry. The present invention establishes the method adopting the frozen-sperm of the sea bass to induce the egg gynogenesis of a plurality of sea fishes for the first time, which selects the cold-shock starting time, cold-shock temperature and the cold-shock durance time that are separately suitable for fish eggs of the strip-spotted flounder, the turbot and the canine-tooth paralichthys olivaceus to establish a micro-satellite marking identification method of the gynogenesis fry. The percentage rate adopting the present invention to acquire the gynogenesis fry of the strip-spotted flounder, the turbot and the canine-tooth paralichthys olivaceus is 7.8 percentages to 40.7 percentages, 26 percentages to 34 percentages and 10 percentages to 25 percentages respectively. The established method of the present invention is characterized in advancing, high efficiency, accuracy and reliability, which has an important application value in fish gender controlling and the production of the all-female fries and has a broad popularization and application prospect on fish cultivation and fish breeding.

A method of gathering, analyzing, and reporting data about commercial fish stocks and fisheries. Under this method, individual commercial fishermen use a device specific to the type of fishing being done to record the number of fish brought aboard, the number kept or released, the reason for release, the date, time, and location of the catch, and the fishery conditions, such as water temperature, depth, and salinity at the time that fish are brought aboard the fishing vessel. The individual fishermen transfer the data, typically via telephone link, to a central data repository, or to a receiving station when the data is transferred to the central data repository at a later time. The data is encrypted during transfer and placed in fisherman files, each fisherman having his own, restricted-access file. Data from all individual fishermen, as well as from other sources, are placed in a composite data pool to be used as source data for a general fishery database on fishstocks and fisheries. This data can be stripped of data that would identify a particular fisherman as the source, to preserve fishing secrets. Confidential reports can be generated from a fisherman file and delivered to the individual fisherman who is the source of that data. Reports for regulatory agencies can also be generated from the data in the fisherman file. The fishery database provides a unit for regulatory agencies, fisheries managers, and fish research institutions to analyze, monitor, and report on the development of fishstocks and fisheries.

The invention discloses an artificial breeding method for siganus oramin. Siganus canaliculatus and Siganus fuscesens are common fish stocks of Siganus, the physiological characters, reproductive habits and the breeding methods of the Siganus canaliculatus and Sigauns fuscesens are more similar, the problems that the source and domestication are difficult, newly hatched individuals are small in body size, the death rate caused by strong irritability of larva is high, a systematic artificial breeding technique is in shortage, the breeding offspring seeds are mainly from natural seedlings captured from ocean, and the like exist in the artificial breeding process. The artificial breeding method adopts the technical measures of parent fish culturing, cultivation, artificial spawning and incubation, larva cultivation pool preparation, cultivation water quality conditioning, staged bait feeding and juvenile fish transportation, so that the industrialization production of parent fish supply and seedling culture is realized, and the technical problems of artificial spawning and incubation of parent fish, selection and enrichment of larvae bait, water quality regulation and control, larva transportation and the like in the artificial breeding process of Siganus canaliculatus and Siganus fuscesens are systemically solved. The spawning rate of the cultivated parent fish can reach more than 65 percent, the average spawning fertility rate can reach more than 85 percent, and the survival rate of artificial breeding is 10.7 percent-27 percent.

The invention provides a real-time fish stock monitoring and fish amount estimating system based on a wireless communication network, which mainly comprises an underwater acoustic transducer, a fish finder processor and a micro-processing unit, wherein the micro-processing unit detects echo reflection signals of a fish stock and extracts an average value of the rear echo reflection strength within a period of time in a specific water depth range; and fish stock mapping information in an echo reflection mapping graph formed by echo signals is extracted, and remote transmission and display of fish stock information are realized. The system can also be used for predicating the fishing yield besides displaying fish finder images in real time. The system provided by the invention can be applied to a plurality of fields such as real-time monitoring for fixed net fishery and the sea net cage breeding industry, observation of artificial reef fish-gathering effects, fish stock detection under an artificial fish-gathering device in tuna seine purse fishery and the like, and has very important significance for improving the production efficiency of marine fishery.

Disclosed herein are methods for mixing of carbon dioxide (CO2) and / or other nutrients in an ocean, wherein surface water CO2 is decreased to reduce or slow acidification of the ocean, and increases in fish populations are advantageously promoted. Also disclosed herein are methods and systems for recovery of nutrients, for example, phosphorus, from an ocean floor in the form of fish biomass, which may be used to make such useful products as fish fillets, fish meal, fish oil, biofuel or fertilizer.

The invention discloses a fish stock quantity estimating method based on a probability hypothesis density particle filtering algorithm; the method includes steps of (1), fixing dual-frequency identifying sonar; (2), performing underwater detection through wall navigation, and acquiring acoustic data; (3), processing the acoustic data, and counting the fish body by using the probability hypothesis density particle filtering algorithm; (4), calculating the volume of the sweeping water body, and solving the density of the fish stock; (5), according to the water storage of the known water domain, estimating the fish body number in the whole water domain. By using the probability hypothesis density particle filtering algorithm based on a random set theory, the fish body is counted one by one, and the fish stock number in the water body identified by dual-frequency and swept by sonar is counted; the method is simple and easy to practice, high-efficient and cannot damage the fish resource, and others; compared with the traditional method of integrating by using the target intensity, the method has higher precision, and provides a new way for the fish resource evaluation.

The invention relates to the technical field of sonic wave fish driving and aims to provide an underwater net cage multi-beam fish driving monitoring system and an underwater net cage multi-beam fish driving monitoring method. The monitoring system comprises an underwater net cage, an underwater monitoring device and a data processing device, wherein the underwater monitoring device comprises a phased array transducer array and a high-frequency sonic wave oscillation circuit, which are arranged outside of the net cage; the data processing device comprises a data processing module, a first wireless transmission module, a computer control center and a second wireless transmission module, wherein the data processing module and the first wireless transmission module are distributed around the net cage, the computer control center is placed on a bank and the second wireless transmission module is connected with the computer control center; and the phased array transducer array and the high-frequency sonic wave oscillation circuit are both connected with the data processing module, and the data processing module, the first wireless transmission module, the second wireless transmission module and the computer control center are connected in sequence. The system and the method can determine the accurate position of the breakage of a net and can effectively prevent the fish stock for escaping from the net.

The invention discloses a culture method of barbus capito. The method comprises the following steps that barbus capito in rivers, lakes, reservoirs and other natural water is selected, or artificially cultured adult barbus capito is selected as parent fishes; a culture pond, the parent fish stocking number, the stocking mode and the culture and feeding mode are selected, and management is enhanced; the parent fishes are subjected to artificial spawning induction; artificial fertilization is carried out; artificial incubation is carried out; fry rearing is carried out; fingerling culture is carried out. Culture and screening of the parent fishes, the odinagogue variety, the concentration ratio, the injection mode, incubation conditions and other conditions are optimized, and the spawning induction rate, fertilization rate and incubation rate of the cultured barbus capito all reach 90% or above.

The invention discloses a salvage treatment device for dead fish. The hull is provided with a pulverizer, and the pulverizer is provided with a feed port and a discharge port. There is a collection box, a joystick is set on the control box, a motor is set on one side of the control box, the motor is connected with a universal converter, and the universal converter is connected with one end of the telescopic folding link, and the telescopic folding link is The other end is connected to the net hoop, one end of the telescopic folding connecting rod is equipped with a water quality detector, the net hoop is equipped with a fishing net, the bottom of the hull is embedded with a disinfectant electromagnetic spray head, and one end of the disinfectant electromagnetic spray head is connected to a disinfectant. Agent box, this kind of device can salvage the dead fish on the ocean, avoid the dead fish from polluting the ocean or causing other fish to be affected by diseases, and then crush them, which can be used as fish feed, and can also be used as fish feed. An area with a lot of dead fish will be detected and then dealt with in time.

The invention discloses a fishing capsule containing a fish luring agent and a processing method of the fishing capsule. A capsule shell capable of being rapidly disintegrated in water is formed by sleeving a left capsule shell and a right capsule shell. A strip-shaped notch is axially formed in the open end of the upper end of the right capsule shell. Multiple through holes are formed in the capsule shell. The capsule shell is prepared from, by weight, 4-8 parts of sodium carboxymethyl starch, 90-95 parts of ground calcium carbonate, 1-3 parts of musk powder, a proper amount of effervescent disintegrant and a proper amount of color master batch. The effervescent disintegrant is a mixture prepared from sodium bicarbonate and citric acid. The components are weighed according to weight parts and mixed and stirred to be uniform, clear water is added, the mixture is stirred and dissolved evenly, and the capsule shell is prepared. The situation that people are hurt by fishing hooks and bait disengages can be avoided, and the fishing capsule can be rapidly disintegrated in the water and achieves an obvious food calling function on fish stocks. The invention further provides a method for processing the capsule shell with the functions.

Areal population density and detailed behavior of fish schools and their interaction are continuously monitored over continental-shelf-scale areas spanning thousands of square kilometers by ocean acoustic-waveguide remote sensing. In some embodiments, the capacity of certain geophysical environments, such as continental shelves, islands, etc. to behave as acoustic waveguides is utilized; sound propagates over long ranges via trapped modes that suffer only cylindrical spreading loss, rather than the spherical loss suffered in conventional sonar approaches.

Fish hiding units are discloses herein, which may comprise a sinkable container comprising at least one open end; a plurality of elongated and substantially flat projection members comprising a body and opposing ends inserted at one end into the open end of the container; and an adhesive substance disposed in the container for attaching the projection members inside the container.

The invention discloses a high-yield freshwater fish culture method. The culture method comprises the steps of pond cleaning and disinfection of a culture pond, preparation before fish stocking, fry prelibation, fry stocking, feeding, pest control and prevention, water quality control and humidity fishing. According to the high-yield freshwater fish culture method, through the reasonable disinfection of the culture pond and the reasonable fertilization and water injection before fish stocking, the method provides an ecological environment with a safe and stable earlier stage for fry, so that the culture method is green and environmental protection, the intensification is higher, the fish production is greatly increased, the fish with different feeding habits is fed with the collocation of plankton and fodder without antibiotic, the pollution is less, the safety is high, and through the pest management, the water quality management and the modest fishing, the healthy growth and the delicious meat quality of the freshwater fish can be guaranteed effectively.

The invention discloses a system for sorting fishes passing a fish way and relates to the field of fish way engineering. The system comprises a sorting chamber, a sorting tank, a releasing tank, a restoring pond and a discharge pipe, the sorting chamber is arranged above an observing chamber, the sorting tank is respectively connected with a lifting gate chamber and the restoring pond, a sorting tank inlet gate is arranged at a junction of the sorting tank and the lifting gate chamber, a sorting tank outlet gate is arranged at a junction of the sorting tank and the restoring pond, and a sorting platform is arranged on one side of the sorting tank; the releasing tank and the sorting tank are parallelly arranged side by side, one end of the releasing tank is communicated with the restoring pond, and two ends of the discharging pipe are respectively communicated with the restoring pond and a fish way body. The system overcomes the defects that the prior art is unsupportive of sorting or low in sorting efficiency, a fishing net is prone to causing damage to fishes in the process of fishing and analyzing, dehydration operation is prone to causing fish death, the fishes need to be moved out of the fish way after fish collection for sorting, identifying and measuring, and the lifting process is time-consuming and labor-consuming. The invention further discloses a method for sorting the fishes passing the fish way.

This invention provides a vessel system and methodology that can be used to promote growth of phytoplankton in the oceans. Unmanned self-controlled wave-powered vessels are equipped with storage units for dispensing a fertilizer, and with sensors to monitor ocean conditions and effects. Fleets of vessels move autonomously by on-board processing of GPS and directional information, piloting a path that is coordinated by a central processing unit. The vessels travel through a defined target area, creating a detailed survey of chemical and biological characteristics that affect grown. The data are processed in a computer model to identify precise locations and precise amounts of fertilizer that will produce the best results. Projected benefits of fertilizing plankton include sequestering CO2 from the atmosphere, and enhancing the marine food chain to improve the fish stock in and around the treated area.

The invention discloses a wind-power fish food thrower. The wind-power fish food thrower comprises a feeding box, wherein an upright plate is fixedly arranged on the upper end face of the feeding box,a rotating chamber is formed in the upright plate, a starting mechanism is arranged in the rotating chamber, a working chamber is formed in the feeding box, a feed throwing mechanism is arranged in the working chamber and comprises a first rotating shaft which is rotatably arranged on the lower end wall of the working chamber, a transmission chamber is formed in the feeding box, a vertical grooveis formed in the rear end wall of the transmission chamber, and a transmission mechanism is arranged in the transmission chamber. According to the wind-power fish food thrower, fish food can be thrown into a sea by the device through wind power as long as the fish food is placed in a food storage box, so that manpower consumption is effectively lowered; and through wind-power feeding, the fish food can be better thrown into a fish pond even if the area of the fish pond is relatively large, and thus, fish stocks in the fish pond can relatively uniformly share the fish food.

The invention relates to a method for classification and identification of fish eggs and larval and juvenile fishes, and is characterized in that firstly, adult fish samples in an investigated water area are collected and are classified and identified, DNA is extracted from various classified and identified fish samples, COI sequences are amplified and sequenced by PCR respectively, and accordingly, a COI sequence database of the investigated water area fishes is established; then investigated and collected fish egg and larval and juvenile fish samples are numbered, and the COI sequences are amplified and sequenced by using the same method; the sequencing result is compared and analyzed with the established COI sequence database, and thus the types of the fish eggs and the larval and juvenile fishes are identified. The fish eggs and the larval and juvenile fishes at the fish early developmental stage are classified and identified fast, the shortages of difficult identification of fish eggs and larval and juvenile fishes, long time consuming and large workload are overcome, and fast, accurate and efficient advantages are showed.

The invention relates to a device for collecting fish eggs and juvenile fish. The device comprises a fish collecting barrel and a conical net connected with the fish collecting barrel, wherein a cylindrical double-layer barrel in the fish collecting barrel is composed of an upper barrel section, a middle barrel section and a lower barrel section; the middle barrel section is composed of a plurality of connecting rods which are uniformly distributed along the periphery of the barrel; the upper barrel section and the lower barrel section are connected through the connecting rods; a bottom cover is hinged with the bottom end of the lower barrel section; a net fastener is sleeved on the upper barrel section; a circular steel ring is arranged at a large opening of a conical silk gauze in the conical net. The device for collecting fish eggs and juvenile fish, provided by the invention, can solve the problems that the conical net is separated from the fish collecting barrel, the eggs, juvenile fish and rubbish are clamped, the floating rubbish enters into the net, and the like; the efficiency and accuracy of investigation work can be increased; the maintenance and manufacturing cost can be reduced.

The invention relates to an aquaculture system which comprises a filtering system, a batch charging system and an air injection system. The aquaculture system is applied in a fish tank, a filtering tank is arranged on one side of the fish tank, and the liquid level of the fish tank is higher than that of the filtering tank. The filtering system comprises a U-shaped siphon, a filtering tank water outlet arranged below the filtering tank and a fish tank water inlet arranged on one side of the fish tank away from the filtering tank, two orifices of the siphon are inserted below the liquid levels of the fish tank and the filtering tank, the filtering tank water outlet is communicated with the fish tank water inlet, and water in the filtering tank is delivered from the filtering tank water outlet to the fish tank water inlet through a pressure pump. By means of the technical scheme, water is guided to the filtering tank through the siphon, the problem that fish stocks are frightened by noise caused by the fact that a water pump is directly utilized to pump water from the fish tank is solved, and the advantages are obvious. A smart aquaculture system and a culture method using the system are further provided.

Eicosapentaenoic acid (EPA) compositions and EPA-rich polar lipids for prophylactic or therapeutic applications are described. Production from certain cultured micro-organisms (like Nitzschia laevis) promotes synthesis of EPA, including polar lipids including EPA. The EPA-rich polar lipids themselves may be used as polar compounds. EPA can be selectively hydrolysed from particular positions in isolated polar lipids by lipase activity, then optionally further purified. The process bypasses reliance on diminishing fish stocks and on physico-chemical processes that may not adequately separate desirable n-3 HUFAs from unwanted products like DHA also found in fish oil and cultured organisms.

The invention discloses a fishing device and method for fish stock at the medium and deep sea bottom. The fishing device comprises an elastic ring, a dragnet arranged on the elastic ring, a pluralityof floats arranged on the upper side of the elastic ring, a plurality of counter weights on the lower side of the elastic ring, two supporting rods arranged on the elastic ring, and a flexible shaft arranged on the two supporting rods. One end of the flexible shaft is connected with one supporting rod rotationally, the other end of the flexible shaft is connected with a rotation shaft of a motor arranged on the other supporting rod, a plurality of bell-mouth water inlets are arranged on the flexible shaft, each bell-mouth water inlet is connected with an L-shaped drain pipe, the L-shaped drainpipes are all connected with the flexible shaft perpendicularly, and the central line of each bell-mouth water inlet is perpendicular to the lower portion of the corresponding L-shaped drain pipe. The fishing device and method has the advantages of guaranteeing fishing efficiency and reducing production cost by automatically regulating size of the opening of the dragnet according to density of fish and shipping speed.

The invention discloses a treatment method for a water ecosystem of a eutrophic water body. The treatment method comprises the following steps: 1) removal of fishes; 2) addition of a silicate composite aqueous solution; 3) planting of a variety of emergent aquatic plants in a target water area; 4) planting of a variety of floating-leaved plants in the target water area; 5) construction of a submerged plant community in the target water area; 6) fish population structure preliminary construction engineering: a step of stocking fish species for controlling algae and trash fishes in the target water area; 7) selection of benthonic animals for the target water area, wherein the benthonic animals are manually put on the water surface of the target water area; 8) putting of herbivorous control fishes to realize basic control of the submerged plants; and 9) putting of siniperca chuatsi and / or culter alburnus. The treatment method provided by the invention has small investment, fast action andlong-acting working basis, does not pollute the environment, is environmentally friendly, can be used for a long time, is wide in application range, can be applied to ponds, lakes, landscape water bodies, reservoirs and the like, and is not limited by water areas.

The invention discloses nutritional wheaten foods and nutritional juice prepared from the following raw materials: chicken meat, duck meat, goose meat, beef, mutton, pork, rabbit meat, chicken hearts, duck hearts, goose hearts, beef hearts, mutton hearts, pork hearts, rabbit hearts, chicken livers, duck livers, goose livers, beef livers, mutton livers, pork livers, rabbit livers, fish stocks, coarse grains, fruits and vegetables, wherein the fish stocks comprises silver carps, spotted silver carps, grass carps, carps, crucian carps, hairtails, yellow croakers, eels, turtles, shrimps, crabs and sea cucumbers; the coarse grains comprise sesame seeds, sunflower seeds, peanuts, tartary buckwheat tea (tartary buckwheat rice ), oat, buckwheat, wheat, black rice, coix seeds, soy beans, mung beans, black beans, red beans and the like; the fruits comprise apples, pears, kiwi fruits, haws, jujubes, pineapples, watermelons, bananas, oranges, tangerines, pawpaws and the like; and the vegetables comprise purple laver, kelp, lentinus edodes, long-rocked mushrooms, onions, garlics, carrots, white radishes, tomatoes, cucumbers, white gourds, bitter gourds, towel gourds, pumpkins, black fungus, white fungus, lotus root, Chinese yams, eggplants, tea and the like. 40 kinds of nutritional wheaten foods and 40 kinds of nutritional juice can be prepared.

The invention discloses a fish passing system with a tourism viewing function and a fish passing method, and belongs to the technical field of water conservancy and hydropower ecological protection. The system comprises a dam body, a ferris wheel, a water supplementing assembly and a master controller, a releasing slide way is arranged on the upstream of the dam body, one end of the releasing slide way extends into a dam body reservoir area water body, a fish passing transfer mechanism is arranged on the downstream of the dam body, and the fish passing transfer mechanism is connected with the water body on the downstream of the dam body through a fishway; the ferris wheel is located between the fish passing transfer mechanism and the releasing slide way, a plurality of manned fish lifting mechanisms are evenly distributed on the ferris wheel, one end of the water supplementing assembly extends into a dam body reservoir area water body, the other end of the water supplementing assembly is connected with the fish passing transfer mechanism, and the master controller is connected with the ferris wheel, the fish passing transfer mechanism and the manned fish lifting mechanisms. The ferris wheel is combined with the fish upstream tracing requirement, upstream and downstream fish population gene exchange of the high-water-head water conservancy project is promoted, meanwhile, the tourism and sightseeing value of the water conservancy project is improved, and the project investment is obviously reduced.

The invention provides a culture method of perches adopting a sea net cage. The culture method comprises following steps of: step 1), keeping the salinity of culture water in a range between 3 per thousand and 30 per thousand and culturing kelp, asparagus or porphyra yezoensis in the sea net cage in culture water; step 2), employing a 5-inch sieve to screen fish stocks of perches, immersing perch fingerlings for a bath by adoption of a 3% saline solution for disinfection and putting perch fingerlings to the sea net cage with the certain stocking density; step 3), feeding perch fingerlings with artemia larvae in a time range from the second day to the sixth day of feeding and then feeding perch fingerlings with artemia larvae combining fry feeds on the seventh day of feeding; step 4), feeding with juvenile fish feedstuff when perch fingerlings grow at 8 to 12 cm; step5), catching perch fingerlings when perch fingerlings grow at 25 to 45 cm. The culture method of perches adopting the sea net cage has following beneficial effects: based on growth characteristics of perches, a culture method adopting the sea net cage suitable for growth of perches is provided and capable of significantly shortening culture period of perches; and cultured perches have advantages of high protein content and tender meat.

Methods for the production of reproductively sterile fish and aquatic animals for aquaculture, the aquarium trade, and control of invasive species are described. The methods include disruption of gonadal development through the administration of compounds that lead to the failure of fertile gonadal development. Compounds may be delivered to the eggs prior to fertilization or water activation or post fertilization and water activation by contacting unfertilized or pre-water-activated fertilized eggs or fertilized eggs in an immersion medium including the compound of interest. Compounds may be conjugated with a molecular transporter compound effective for chorionic transport of the conjugate. The compounds may be antisense Morpholino oligomers that are cap able of effectively suppressing the expression of the dead end gene or other essential genes for germ cell development in fish and other egg-producing aquatic animals.

The invention provides a fish breeding method which comprises the following steps: a. construction of a pool; b. pre-preparation for fish stocking; c. fry preprocessing; d. feeding with feed; e. waterquality management; and f. fishing appropriately. The fish breeding method can timely clear away rubbish and waste residues in the pool to keep a good pool environment, and the feed nutrition arrangement is reasonable, so that the immunocompetence of fish can be effectively improved, meat quality can be improvd, and yield can be increased.

The invention discloses a fish stocking method, comprising 1) fish pond digging: wherein a pond A and a pond B, a water inlet A and a water inlet B, and a water outlet A and a water outlet B are vertically adjacent; the water inlet A and the water inlet B are each provided with a water filtering device; a water wheel apparatus is disposed between the water outlet A and the water outlet B; a water mill is disposed between the water inlet A and the water outlet B; and at least one stair embankment with a slope is disposed between the water inlet A and the water outlet A and between the water inlet B and the water outlet B; and 2) fish breading; and 3) fish rearing. According to invention, an artificial caven and sloped water inlets and water outlets are disposed in the fish pool, so that fish have a good activity area and a clean water stream and fish can play in the water, improving the activity of the fish and enhancing the health of fish. By providing natural food for fish, food intake ability of the fish is improved, thereby reducing fish diseases and promoting rapid growth of the fish.