78 results about "Fishing industry in the Maldives" patented technology

A method of aquaculture is applicable to a novel culture arrangement for diversified farming of generally deep sea fin fishes, shrimps, and shellfishes. A pre-manufactured enclosed cultivation tank is provided and air compressor facility is included for pressurization and oxygenation so as to make the interior of the cultivation tank a pressurized water environment of predetermined high pressure. A low pressure siphon tube is included for sucking and removing excrements from the cultivation tank and to realize water replacement in a natural manner thereby providing a deep sea mimicked clean cultivation environment. The drained water is subjected to multiple steps of filtration and purification for separating the excrements from the water and for purifying water to allow cyclic use of the water. An arrangement of multiple cultivation tanks allows for diversified and multi-species cultivation of fishery products and deep sea fishes.

The invention provides a leisure-cultivation-environmental protection integrated marine ranch. The marine ranch located in surrounding waters near coastlines comprises a cultivation region formed by encircling of a plurality of cone-shaped cultivation net cages, wherein aquatic products are cultivated in the cultivation net cages; artificial fish reef rows are accumulated in waters close to the periphery of the cultivation region, and sea grass and / or seaweeds grow on the artificial fish reef rows and in waters in the bottom of the cultivation region; and an automatic feeding device and a leisure wharf boat are arranged in the cultivation region formed by encircling of the cultivation net cages. Based on an ecological circulating system marine ranch and recreational fishery, the invention provides the marine ranch system which is the novel marine fishery production mode for management by making full use of modern science and technology. The ecological environment of the waters is optimized by repairing and constructing habitats of aquatic organisms and a win-win state of mutually promoting joint development of low-carbon environment protection and tourist industry is achieved by combining artificial cultivation and leisure tourism, so that better economical benefit, ecological benefit and social benefit are obtained.

The invention relates to a manual fish reef device of an island-and-reef ocean fishing area and a distribution method thereof, belonging to the technical field of manual fish reefs and solving the technical problem of ensuring fishing resources in the fishing area. The method comprises the following steps: distributing trapping fish reefs in adjacent waters of each fishing point; and distributingproliferated fish reefs in external waters of the fishing area; and distributing grooming fish reef belts between each trapping fish reef and each proliferated fish reef and between the proliferated fish reefs. The invention improves ocean benthic environment and cultures habitat consciousness of fishes by various manual fish reefs so as to lock the proliferated and trapped fishes in the fishing area whenever possible and guide the fishes around each proliferated fish reef to swim to the trapping fish reef by the grooming fish reef belts. The device and the method can improve the fish-collecting effect and ensures the sustainable development of the ocean fishing area.

The invention discloses a device and a method for cultivating sea cucumber on the seabed by using a net cage for cultivating shellfish, which relate to the cultivation of a finery seawater floating raft net cage and use the conventional cultivation appliances such as a floating raft body, a net cage and the like for cultivating the shellfish to cultivate the sea cucumber through small adjustment and change. The shellfish cultivation of long-term large-scale high-density single variety causes seawater nutrient substance decline, unsmooth current and frequent diseases and insect pests in partial cultivating sea areas of Liaoning and the like. The large-area abrupt death of the shellfish increases the seawater shellfish cultivating cost and the risk. The method comprises the following steps: straightening the net cage for cultivating the shellfish, fixing the net cage and a rod-shaped object made of lightweight materials such as a bamboo rod or a wooden rod and the like together by strings to keep the net cage in a supporting state, then connecting the net cage and the raft body through a connecting rope to form a device, and making the integral specific gravity of the net cage in the device slightly larger than the specific gravity of the seawater. The device and the method have the advantages of preventing and controlling environment pollution, saving energy and labor, greatly increasing efficacies and providing new technology and development direction for vertical three-dimensional cultivation of the shellfish and the sea cucumber.

The invention relates to the technical field of forest plating, and particularly relates to a method for planting a mangrove forest in a high-salinity deepwater sea beach. The method comprises the following steps: (1) preparing land; (2) planting; and (3) maintaining and managing the forest. Because no natural distribution of the mangrove forest exists in the deepwater sea beach, the mangrove forest cannot be successfully planted by adopting a conventional method; the mangrove forest can be planted in the high-salinity deepwater sea beach by adopting the method disclosed by the invention, the distribution area of mangrove forest wetland resource in a coastal region of South China is enlarged, the ecological function of protecting the coast by the mangrove forest is given a full play; water channels coexists in a mangrove forest restoration area, and thus a diversified environment is created so that a diversified living space can be provided for wildlife; meanwhile, in a mangrove planting area of the deepwater sea beach, by using the water channels in the mangrove forest, a natural ecological cultivating system in which the mangrove forest and the fishery industry coexist can be established, and the sustainable healthy development of the aquaculture industry in a coastal community is effectively promoted.

The invention relates to a culture method of aquatic products, in particular to a culture method of water crabs. The culture water quality of the culture method meets the water quality standard stated by fresh water aquaculture water quality. Natural crab fingerlings in sea area or artificial crab fingerlings reared according to the principle of organic aquiculture are selected, and mixed culture mode is adopted. The feedstuff uses live and fresh fauna and flora bait. Bed sediment is sterilized periodically during cultivation. Compared with existing culture method, the invention has the features of rapid growth speed, strong disease-resistant capability and so on; colony weight-gain rate is improved by 10 percent comparing with existing culture method; disease incidence rate reduces from 8 percent-10 percent to less than 4 percent. The invention has a remarkable economic benefit, and is a reliable technology support to increase the efficiency of fishery and the income of peasant in new period.

The invention relates to a method for artificial mass propagation of rice field eel seedlings, and belongs to the technical field of scientific application of fishery. The method is characterized by applying oral oxytocic hormone to rice field eels, namely feeding parent rice field eels with a certain dosage of oxytocic hormone by using animal bait as a carrier of the oxytocic hormone; and the method comprises the following steps of: stopping feeding of both male and female parent rice field eels for 1 day before spawning induction; observing oestrus conditions of bubbling and nesting of the male and female rice field eels in 3 to 4 days after the male and female rice field eels ingest an oxytocic hormone liquid medicament, and surrounding and marking nests with eichhornia crassipes after the nesting of the parent rice field eels is finished, wherein an inner net cage in a paddy field is used as a spawning pond; and naturally inseminating the parent rice field eels in the spawning pond, breaking membranes by fertilized ova and emerging seedlings after 144 hours, inhabiting all fish fries in the eichhornia crassipes surrounding the nests of the parent rice field eels after the fish fries break the membranes after 96 hours, and collecting the rice field eel seedlings at the time. By applying the method of the invention, the spawning induction ratio of the parent rice field eels reaches 80 to 90 percent, the hatching rate of natural spawning and fertilization is over 95 percent and the collection ratio of the rice field eel seedlings is over 95 percent.

The invention discloses a breeding method of Procypris merus and relates to the technical field of fishery. The method includes the steps of preparing parent fishes, performing artificial breeding and variety breeding, performing fry rearing, separating and optimally selecting summerlings, rearing and optimally selecting fingerlings and the like. By the use of the method, the problem that germplasm of the variety of Procypris merus degrades is solved.

The invention relates to a method for forecasting northwest Pacific Ocean squids resource stock recruitment. The method comprises the following steps of: 1, calculating the sea surface temperature data; 2, counting sea areas of which the sea surface temperature is 21-25 DEG C in the seas in the range of 130 DEG-170 DEG E and 20 DEG to 30 DEG N from January to April; 3, converting the sea surface temperature in the 130 DEG-170 DEG E and 20 DEG to 30 DEG N into a surface temperature contour map, and calculating the proportion of the seas of which the surface temperature is 21-25 DEG C (February AREASST, and the unit is %); 4, obtaining a formula of calculating squids resource abundance (CPUE, and the unit is t / d) on history; and 5, calculating the squids resource abundance CPUE=0.134449*AREASST-8.7821 in next year. The method has the advantages of: by the relational expression, more than 60% of the squids resource abundance change can be explained. The forecasting result of the northwest Pacific Ocean squids resource stock recruitment is provided for users and related departments in time and is taken as a scientific reference for fishery production and arranging; and the method can be released as a product in real time in future.

The invention provides a device and a method for breeding sea cucumbers in bathyal half-hanging floating rafts and cages, and relates to the fishery-seawater floating raft and cage breeding. The existing shellfish breeding apparatus such as floating rafts, cages and the like are utilized to breed sea cucumbers through slight adjustment and modification. Large-scale high-density breeding of single shellfishes in a long term causes series problems such as reduction of nutriment, unsmooth water flow and frequent occurrences of disease and insect pest in partial breeding sea areas of Liaoning province; the low-quality shellfish and large-scale paroxysmal death of the shellfish increase the cost and risk of seawater shellfish breeding. According to the invention, by utilizing the existing shellfish breeding apparatus such as floating rafts, cages and the like through slight adjustment and modification, the cages are sunk to the seabed during the low tide and can be separated from the seabed during the high tide. Organisms such as a plurality of shells and bacteria deposited at the seabed of the shellfish breeding area are all the main bait of the sea cucumbers. The device and the method have the advantages of preventing environment pollution, saving energy and labor, greatly increasing efficiency, and providing new technology and development direction for the alternate culture and mixed culture of sea cucumbers and shellfish.

The present invention relates to a method for utilizing carbonate type swampiness heavy saline lake to develop fishery. Its technical measures include: desludging repairing dykes; expanding water body; building combined high-quality fishpond to carryout breeding in lake, fishponds-connected collection breeding and increase brand-name and high-quality aquatic varieties. Said invention can obviously improve ecological environment of water body, can reduce the pH value of lake water body to 8.2-8.7, can reduce total alkalinity to 5-6 millimole / l, the salt content of soil is reduced to 3-5g / kg, and the salt content of water body can be retained to 2-3 g / l.

The invention provides a grass carp cultivation method comprising the following steps: (1) fry cultivation is carried out, namely grass carp fries are added into a cultivation pond, and are cultivated into fingerlings; (2) fingerling cultivation is carried out, namely the grass carp fingerlings are cultivated until an average mass of the fingerling reaches 500-1000g per fingerling; (3) adult fish cultivation is carried out, namely broad beans are used for feeding the grass carp fingerlings twice per day until the grass carp fingerlings grow into adult grass carps; and the adult grass carps with an average mass of 1000-3000g per carp can be caught and marketed. The grass carp cultivation technology provided by the invention has high efficiency, and assists in effectively improving grass carp annual yield and reducing feeding cost. Also, with the method, the adult grass carps have robust body constitution, good shape, compact meat and rich nutrients. The method meets the requirements of ecological fishery development.

The present invention relates to a fishing simulation method, a fishing simulation execution method, and a fishing simulator, and more specifically, to a fishing simulation method, a fishing simulation execution method, and a fishing simulator, in which a fishing activity procedure of detecting a fish school, gathering fish, and catching the fish can be realized in a three-dimensional virtual space of a computer, and a fishery environment and fishing activity simulated in the computer virtual space comes to be similar to a real fishery environment and fishing activity by simulating the behavior of the fish school, including an avoidance behavior of fish entities forming the fish school, responding to the movement of a fishing boat and a fishing gear, thereby enhancing learning effects on the fishery environment and the fishing activity.

A fishing device particularly designed for Asian carp fishing, which includes two fishing boats, a collection frame, a fishing net, a display mechanism with a plurality of optical sensors and optical receivers, one support mechanism for one fishing boat and one lifting mechanism for one fishing boat. The lifting mechanism includes a motor, a rotary shaft, a bait holding basket, a plurality of shaft supports and a plurality of rope units. Thus, a selected bait can be used for classification fishing. The quantity of fish catch can be determined timely through the display mechanism. The lifting mechanism allows steading lifting of the fish catch out of the water without introducing any harm to the fish catch. The number and survival rate of the fish catch can be ensured while an effective fishing can be achieved. This fishing device is particularly designed for catching Asian carp fishes.

The invention provides a method for breeding sea cucumbers in bathyal half-hanging floating rafts and cages, and relates to the fishery-seawater floating raft and cage breeding. The existing shellfish breeding apparatus such as floating rafts, cages and the like are utilized to breed sea cucumbers through slight adjustment and modification. Large-scale high-density breeding of single shellfishes in a long term causes series problems such as reduction of nutriment, unsmooth water flow and frequent occurrences of disease and insect pest in partial breeding sea areas of Liaoning province; the large-scale paroxysmal death of the shellfishes increases the cost and risk of seawater shellfish breeding. According to the invention, a device is formed by horizontally hanging cages for breeding shellfishes on raft bodies of two rafts, and adjusting the total length (during the low side) of a buoyant rope and a lifting rope to be longer than the distance from the sea surface to the seabed. The device ensures that the cages can be completely sunk to the seabed during the low tide and can be separated from the seabed during the high tide. The invention has the advantages of preventing environment pollution, saving energy and labor, greatly increasing efficiency, and providing new technology and development direction for the alternate culture and mixed culture of sea cucumbers and shellfish.

The invention relates to a pseudosciaena crocea and green crab three-dimensional culture device and method. The pseudosciaena crocea and green crab three-dimensional culture device comprises a floating net and a crab pot. The floating net comprises a floating frame and meshes, wherein the floating frame is a closed polygonal framework, floaters are installed below the floating frame, the floaters are connected to the framework of the floating frame in a strip shape, the meshes are installed surrounding the floating frame in a circle, a container with a top opening is defined by the meshes, and the top opening is matched with the floating frame in shape. The crab pot is placed on the floaters, wherein the side wall of the crab pot is provided with a through hole, and a cover is arranged on the crab pot in a matching mode. The pseudosciaena crocea and green crab three-dimensional culture device and method have the advantages that cage culture of pseudosciaena crocea is realized, and aquatic water is fully utilized at the same time; cage culture of individual green crabs is carried out on an upper layer of a net cage, so that mutual killing of the green crabs is avoided, and the survival rate is up to 95%; besides, bait is fully utilized, the number of waste residues is small, the self-cleaning capacity of the aquatic water is enhanced, balance of the fishery ecological environment is realized, economic benefits are obtained, and the carbon sink function of fishery is also effectively achieved.

An artificial-induction upwelling marine ranching technology belongs to the technical field of marine fishery biological resources culture and proliferation. The artificial-induction upwelling marine ranching technology comprises building artificial fish reefs in shallow sea to providing breeding and foraging for marine organism, wherein the reefs with a certain slope can generate upwelling under the action of ocean currents of a certain velocity to improve the fishing yield. The artificial fish reefs are confined to water depth, ocean currents, terrains and substrate conditions and accordingly are high in investment cost. The artificial-induction upwelling marine ranching technology greatly breaks through the confine of the artificial fish reefs and can be implemented in shallow seas dozens of meters deep as well as in deep sea hundreds or thousands of meters deep to achieve artificial upwelling induction, and meanwhile, is low in investment cost. The artificial-induction upwelling marine ranching technology technically has the advantages of changing rigid materials into flexible materials, a three-dimensional mode into a planar mode and complexity into simplicity, avoiding confine of water depth, ocean currents, terrains and substrate conditions, being applicable to being implemented in ocean waters, achieving high economic benefits and significant social and ecological benefits and accordingly having an incomparably wide application range and great market economic value.

The invention relates to an incubation and seedling-culturing method of Tilapia and a production device. The incubation and seedling-culturing method of the Tilapia is formed by the connection of a water pump, a main water inlet pipe, an incubatory barrel, a seedling collecting tank, a header tank, a return conduit, a reservoir and the like. The factory incubation method of the Tilapia comprises the following steps of: (1) mating of parent fishes: the mating of parent fishes is implemented in a net cage, the parent fishes are put into the net cage and the mating and the ore laying can be performed when the temperature of water reaches over 20 DEG C. (2) artificial fetching of ores: the ores are fetched out of the oral cavity of the female fish and conveyed to an incubation workshop after being cleaned. (3) incubation on the production line; a main water inlet valve of the production line is opened and the water pump is started up. The fish ores are conveyed into the incubatory barrel, a water inlet valve of the incubatory barrel is dimensionally adjusted so that water stream causes the eggs to turn over at the middle and lower parts of the barrel, the fish seedlings flow into the seedling collecting tank subsequent to the incubation and are then collected for seedling culture. The invention can carry out the mass production of the Tilapia in multiple seasons and 24 hours per day, which meets the demands of the seedling culture in distinct seasons and sufficiently gives play to the effect of technical devices and fishery technologies in the production of seedlings culturing.

The invention discloses a method for colonizing and releasing seawater mullets in a public freshwater area and relates to methods for colonizing and releasing seawater mullets which are near-shore river mouth marine fish into natural fishery water areas. The method includes: before colonizing and releasing, lowering water salinity for mullet fries 2-20cm in total length, using fishery medicines to prevent fish diseases, and allowing the mullet fries to adapt to freshwater environments; using a keep-alive transportation method to transfer the mullet fries to net cages in the water area planned for colonizing and releasing for temporary culture; sterilizing the mullet fries to prevent infection and death caused by transportation damage; placing parts of the net cages into water, allowing the mullet fries to initiatively swim out of the net cages and enter the freshwater area so as to increase mullet fry releasing survival rate, and removing the net cages to bring the carbon sink fishery value of the mullets in the freshwater area into play. The method has the advantages that colonizing and releasing varieties are increased, water area purifying capability is increased, the carbon sink fishery value of the mullets in the freshwater area can be brought into play, species invasion risk is avoided, the method is suitable for colonizing and releasing in featured water areas such as lakes, rivers, reservoirs, landscape water bodies and artificial wetlands systems, and water area purification effect can be achieved.

The invention relates to a culture method for the mixed culture of Australian lobsters and golden groupers. Australian lobsters and golden groupers are cultured together in the same pond by 6000 Australian lobsters and 8000 golden groupers per mu, the Australian lobsters are fed twice in the morning and at night each day, and the golden groupers are fed once every four hours. The invention breaks through the bottleneck of domestic culture techniques, can activate the economy of fishing villages under the lead of the 12th Five-Year Plan of China, can prolong fishing moratoria and increase appropriate catches by means of culture done by fishermen, and not only preserves abundant fishery resources, but also accelerates the speed of the sound development of fishery resources and protects the ecological environment. Market demand also can be satisfied, shopping baskets are enriched, and therefore the lives of people are improved. The invention can ensure that the output value per mu of farmers can reach up to 200,000 yuan and that the net income per mu can reach up to 100,000 yuan, thus increasing the income of the fishermen, and thereby farmers can quickly get out of poverty.

The invention relates to the field of fishery ecological recovery and fishery infrastructure, in particular to an inland river artificial fishing bank structure. The inland river artificial fishing bank structure comprises an artificial fishing bank main body, and the artificial fishing bank main body is of a hexagonal structure; the artificial fishing bank main body is stacked and spliced by 18 fishing bank single bodies in 3 layers, and each layer is composed of 6 fishing bank single bodies; two adjacent fishing bank single bodies are inversed. According to the design method of the inland river artificial fishing bank, 30 groups of artificial fishing bank main bodies are put in a bank putting area within the area of 1 square kilometer; the minimum water level of the bank putting area is3 m, the maximum water level is 15 m, the flowing speed is 0.7-3.5 m / s, and the river bottom is a sandstone substrate with the diameter of 10-20 cm. By means of the inland river artificial fishing bank structure and the design method thereof, a place for inland river water area fishes, particularly rare peculiar fishes, to breed, grow, forage and hide is provided, and a fish habitat is rebuilt; the adverse effect of river water conservancy facilities, channel remediation and hydraulic engineering construction is effectively overcome; the self-organizing and restoring capacity of an aquatic ecological system on the ecological environment is regulated, and ecological balance is promoted.

The invention relates to fishery foundation facilities, in particular to a tuna purse seine fishery fish collecting device. The tuna purse seine fishery manual fish collecting device is characterized in that a plurality of luring devices are arranged below a floater, each luring device is composed of bait boxes connected in series, and a sinker is arranged at the bottom of the bait box at the bottom layer. Fish collecting lamps are arranged at the side edges and the bottom edges of net pieces; a plurality of deepwater cameras are also arranged on the net pieces; a controller is arranged on the fish collecting device, and the controller is connected with the bait boxes, the fish collecting lamps and the deepwater cameras. According to the tuna purse seine fishery manual fish collecting device, due to the fact that the bait box is arranged, fish schools are kept swimming around the floater to attract a new fish school, and the fish school maintenance force of the manual fish collecting device is improved; meanwhile, the phototaxis of the tuna is used, the cluster size is increased through the function of the fish collecting lamps, and therefore the effect of luring the fish schools is enhanced; due to the fact that the deepwater cameras are arranged on the net pieces, the yield of fishing through nets at a time and fishing efficiency are improved, and the purpose of reducing cost and improving benefits is achieved; the materials are automatically added in the bait boxes, and the heavy work of manual bait loading is omitted.

The invention discloses a fish-vegetable symbiotic type ecological floating bed and a raising method thereof, and belongs to the fields of aquaculture, environment-friendly fishery and cyclic and effective resource utilization. The floating bed is a closed entirety formed by sequentially connecting a fence protection net, a floating bed body and a net cage from top to bottom in a pond, and vegetables are planed on the floating bed body. The method comprises the steps of 1 fish fingerling selecting and feeding, 2 vegetable selecting and managing, 3 fish and vegetable disease and pest preventing and controlling, 4 floating bed floating force adjusting, 5 net cage cleaning, 6 oxygen aeration equipment using and 7 physical and chemical index measuring. The floating bed is simple in structure, low in cost and significant in produce effect, can effectively improve the water body quality, increase the water body transparency, reduce water resource consumption, prevent aquatic animals from gnawing vegetable roots, ensure good growth of plants, improve the decontamination effect, product organic vegetables, effectively reduce fish diseases and improve the fish flesh quality, and is suitable for eutrophicated water bodies such as polluted rivers, reservoirs and lakes and beneficial for being vigorously popularized.

The invention relates to a method for predicting access fishing of the western and central pacific ocean katsuwonuspelamis purse seine fishery. The method adopts statistic data of each year before a prediction year to first 16 years, which comprises a year, a month, a longitude, a latitude, a fishing effort (shooting times) and a fish catch (ton) in a region from 15 degrees south to 15 degrees north and from 125 degrees east to 180 degrees east, SSTA (Sea Surface Temperature Anomaly) in a Nino3.4 region and an SST (Sea Surface Temperature) in operation waters. The method is characterized in that a 5 degrees * 5 degrees spatial resolution region is used as one sea area, production statistic data of the sea areas in 16 years are matched with corresponding environment data one by one to obtain a relationship of different SSTA and SST ranges and corresponding initialized fishing efforts in each sea area, and an access fishing prediction model of each sea area is established by utilizing a normal distribution model; the basis is provided for scientific access fishing of the western and central pacific ocean katsuwonuspelamis purse seine fishery; blindness of fishing is greatly reduced; and fishing efficiency is improved.

The invention relates to a method for directionally breeding finless eel male parents and belongs to the technical field of fishery scientific application. The method is characterized by comprising the following steps: continuously fasting for 30 days after the female finless eel spawns, thereby quickening the masculinization conversion of the spawned female finless eel; recovering the feeding for the fasted finless eel; stopping feeding till the water temperature is reduced to 15 DEG C in the last ten-day of November in the same year; and then causing the finless eel to stop eating and start to overwinter; starting to feed when the finless eel starts to eat while the water temperature is above 15 DEG C in April in the next year; transferring the finless eel to the front side of a breeding net box after feeding till the last ten-day of April. According to the method provided by the invention, the spawned female finless eel parent is converted to the finless eel male parent 5 months earlier, the masculinization rate is above 95%, 100-150g functional finless eel male parents capable of normally mating in a mating season can be acquired in batches, and the acquired functional finless eel male parents can be used for effectively solving the problems of large size and difficulty in finding of the male parent during an artificial finless eel breeding process.

The invention belongs to the technical field of agricultural product quality analysis, and particularly relates to a freshwater fish variety identifying device and method based on passive acoustic information. A device for extracting original fish sound signals comprises fish tanks, hydrophones are arranged in the fish tanks respectively and respectively connected with an acoustic recorder, and soundproof cotton is arranged outside the fish tanks. The freshwater fish variety identifying method includes the steps of collecting the original fish sound signals; carrying out noise elimination processing on the fish sound signals; extracting the characteristic parameters of the fish sound signals, wherein the characteristic parameters include the short-time average energy, the short-time average zero-crossing rate and the frequency band energy; establishing feature vectors; dividing a sample set; selecting the feature frequency band of the fish sound signals; recognizing the variety through a probabilistic neutral network classifier. According to the established freshwater fish variety identifying method, the variety of freshwater fishes can be online recognized, and the device and method can be used for injury-free detection of the varieties of the freshwater fishes in the freshwater fish culturing and fishery resource surveying processes, and are of great significance in improving the informatization level of fishery facilities.

The invention relates to a directional breeding method of female parents of finless eel and belongs to the technical field of fishery science application. The directional breeding method of female parents of finless eel is characterized by comprising the steps of obtaining one-full-age eels growing consistently and having the individual specification of 30-40g by virtue of breeding in pond net cages under imitated ecological conditions, after overwintering, feeding the one-full-age eels of 30-40g in the pond net cages by high density and with high-protein nutrition for a year, namely the feeding density of 50-80 eels per square meter and the feed protein content of 40%-42%, and postponing the sex reversal of the parents of the eels by more than 12 months, thereby obtaining two winter-age female eel parents having large brood amount and the individual specification of more than 100g; the population fertility of the female eel parents can be improved by 200%-300% and the number of the bred eel seedlings is also improved by 200%-300% correspondingly; as a result, the population fertility of the female eel parents is effectively improved and the requirements of large-scale eel breeding on the seedlings can be met.

The invention provides an inshore cage cultured fish disease control method. The purposes that the disease control effect on cultured river crabs is obvious, and yield and income of a fishery industry are increased are achieved. The inshore cage cultured fish disease control method includes the steps that in a river crab cultivation preparation stage, a crab pool is treated, wherein the treatment process is characterized by including the steps that after the crab pool is filled with water, medicines, with certain concentration, are utilized to conduct insect killing, sterilization and disinfection on the crab pool, and therefore pathogens of river crab diseases and middle important hosts, namely various shellfishes, of the pathogens are killed; after a certain period of time, quick lime is mixed with water according to a certain dosage and then is utilized to splash the whole pool. Through the control method, the occurrence rate of river crab diseases can be reduced, especially the morbidity of trembling diseases of the river crabs can be reduced, and the cultivation yield of the river crabs and economic benefits can be improved.

The invention relates to a fishing net. The fishing net is composed of an operation box, a rotation shaft, a turntable, a lifting rod, a support rod, a pulley and a fishing net unit and can be operated by a single person to achieve flexible usage, easy operation, low manufacturing cost and good market prospect. The fishing net is a novel fishing gear utilized in the fishing industry.