60 results about "Spawning site" patented technology

The invention provides a method for constructing a schizothoracinae artificial spawning site a natural river. The method comprises a first step of carrying out previous preparation, a second step of selecting a construction site of the spawning site, a third step of determining parameters, a fourth step of determining the scale and the structure of the spawning site, a fifth step of determining the paving method of a structural unit, a sixth step of constructing auxiliary facilities and a seventh step of managing and maintaining. According to the method, under the condition that normal operation of a hydropower station is not affected, a shoal can be constructed manually in an appropriate river reach to provide the site of egg reproduction for the schizothoracinae, and the schizothoracinae can be successfully multiplied. The contradiction between river hydroelectric development and ecological protection can be effectively relieved. The scale and the appropriate river reach of the artificial spawning site can be determined according to reach fish resource quantity, labor management serves as an auxiliary means, and the sustainable utilization of the reach fish resources can be well maintained.

The invention relates to the technical field of hydroelectric engineering ecological dispatching, and discloses a cascade power station ecological dispatching system suitable for producing drifting egg fishes, which is used for providing appropriate hydrological process conditions for drifting egg fish breeding and reducing the influence of cascade reservoir operation on the drifting egg fish breeding process. The method is based on the water level of a fish spawn spawning site and a fish spawn drifting river section; change in indicators such as flow, the upstream step is matched with the downstream step to adjust the water level of the fish spawning site and the fish egg drifting river section. Through the cooperative use of engineering measures and non-engineering measures, appropriatehydrodynamic process conditions are provided for the breeding of the fishes laying the drifting eggs, and the influence of the operation of the cascade reservoir on the breeding process of the fisheslaying the drifting eggs is reduced. The method is suitable for the ecological dispatching of the cascade power station nearby living fishes with drifting eggs.

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 relates to a turtle pond which comprises a shallow pool, a spawning site, a flower and tree site which is arranged between the spawning site and the shallow pool for planting flowers and trees, turtle houses, feeding troughs and a water discharge chute. The turtle pond meets the ecology habit of land tortoises or semi-aquatic turtles and the structure thereof is scientific and reasonable, economical and practical; by adopting the turtle pond for raising turtles, both the survival rate and the reproduction rate of the turtles can be high.

The invention discloses a monitoring device in a fish spawning site protection area and aims at providing a monitoring device through which the visual angle range of monitoring shooting / photographing of a shooting device or a photographing device of the monitoring device for a spawning site can be effectively enlarged on the premise that the endurance time of the monitoring device is not affected. The monitoring device comprises a buoyancy device, a connecting rope, a supporting frame, a transparent box, a vertical guide pipe, a piston, a lower limiting block, a reset spring, a vertical flow guiding pipe and a cleaning flow guiding pipe, wherein the transparent box is rotationally arranged on the supporting frame through a vertical rotating shaft, the vertical guide pipe is arranged on the supporting frame, the piston is arranged in the vertical guide pipe in a sliding manner, the lower limiting block is arranged on the inner side face of the vertical guide pipe and located below the piston, the piston can be moved downwards and reset through the reset spring, the vertical flow guiding pipe is arranged on the supporting frame, and the cleaning flow guiding pipe is arranged on the supporting frame. The shooting device and / or the photographing device are / is arranged in the transparent box. One end of the vertical rotating shaft stretches into the vertical flow guiding pipe, and a drive impeller is arranged on the vertical rotating shaft and located in the vertical flow guiding pipe.

The invention discloses a fixed-point monitoring method for marine fish roes, and aims to provide a fixed-point monitoring method for marine fish roes which is low in equipment cost and capable of directly acquiring fish roe samples and researching and analyzing fish roe conditions on spawning sites of fishes. The system comprises a sunken fish roe attachment device, wherein the sunken fish roe attachment device comprises a floating frame, a fish roe attachment base, a counter weight, an upper connecting rope and a lower connecting rope, wherein the upper connecting rope is connected with thefloating frame and the fish roe attachment base; and the lower connecting rope is connected with the fish roe attachment base and the counter weight. The fixed-point monitoring method for marine fishroes sequentially comprises the following steps: 1, throwing the sunken fish roe attachment device into a specified sea area, wherein the floating frame floats on the sea surface, the counter weight sinks to the seabed, and the fish roe attachment base is close to the seabed; and 2, recovering the fish roe attachment base after the set time T.

The invention discloses a spawning site positioning inversion simulation method based on drifting roe embryo development time. The method comprises the following steps of collecting roes at a preset detection position; identifying the development time of the collected roes to obtain the drifting time of the roes; establishing a gridding two-dimensional water flow model, and calculating the flow velocity of each grid node in the two-dimensional water flow model; and based on the flow velocity of each grid node in the two-dimensional water flow model and the drifting time of the roes, taking each collected fish roe motion as a simulation object to carry out inversion calculation, thereby realizing positioning of the spawning site. According to the method disclosed by the invention, the waterflow is gridded based on the two-dimensional water flow mathematical model, so that the flow field distribution of the water flow is calculated, and then the position of the fish spawning site is deduced and positioned according to the collection position and the drifting time of the fish roes. Compared with the mode that water flow is regarded as constant-speed fluid in the prior art, the difference of water flow speeds at different positions is considered, so that the positioning accuracy of the fish spawning site is greatly improved.

The invention discloses a living body transportation method of Octopusochellatus seedling breeding and releasing, and relates to the technical field of the living body transportation of the marine product culture. Rice hulls are used as a substrate, the rice hulls are softer, and cannot hurt the Octopusochellatus young seedlings in the shaking process. The rice hulls can be suspended in the seawater so as to form countless enclosed spaces, so the probability of cannibalism of the Octopusochellatus young seedlings is reduced. The use water for raising and transporting the Octopusochellatus young seedlings is the seawater in which suspended particles are removed, and the used seawater for raising and transporting the Octopusochellatus young seedlings is the same as the seawater of the natural spawning site sea area of Octopusochellatus seedling breeding and releasing, so the Octopusochellatus young seedlings can adapt the natural sea area environment as soon as possible, the effect of the environmental change to the survival rate of the Octopusochellatus seedlings is reduced, and the survival rate of the seedlings is improved. The method has the advantages of no anesthetics, no food quality and safety risk, no gradient cooling, no effect to the survival rate of the Octopusochellatus young seedlings, cheap cost, security and environmental protection, and high survival rate of the seedlings.

The invention provides a muddy man-made spawning site selecting and building method of plateau river schizothorax. The method includes the steps: firstly, selecting a muddy man-made spawning site of the plateau river schizothorax; secondly, deeply digging the man-made spawning site to reach 30-40cm; thirdly, preparing mud substrates; fourthly, covering the man-made spawning site with the mud substrates; fifthly, remodeling the topography of the spawning site. According to the method, a suitable river section is selected, the flow velocity of the area is low in flooding, so that the area adoptto spawning of the schizothorax, eggs cannot be carried away by water flow, the topography of the spawning site is flat, so that the eggs are easily attached into spawning pits, bottom substrates of the spawning site are created, pit digging behaviors of the schizothorax can be met, stability of the spawning site and the spawning pits can be maintained, and the spawning pits cannot collapse afterthe schizothorax spawns.

The invention discloses a navodon septentrionalis spawning site and an ovum harvesting method. A spermatovum harvesting device of the navodon septentrionalis spawning site comprises a plastic corrugated sheet which is taken as a base of the device, lead weights or other weights are arranged on four corners of the base of the device, and four pieces of rectangular soft plastic cloths which are mutually staggered are arranged on the base of the device. The device is placed at the bottom of the navodon septentrionalis spawning site, the soft plastic cloths which are sewn and fixed on the device are placed upward, the direction of the soft plastic cloths is vertical toward the direction of water flow, and ova adhered on the plastic corrugated sheet base and the soft plastic cloths are collected after parent fishes spawn. The device can simulate condition of the navodon septentrionalis spawning site in natural sea area, an environment which is more familiar and adaptive to the parent fishes is formed, the parent fishes can be shielded, and stress response in a parent fish rearing process is reduced, thus being more convenient for the mating and spawning of the parent fishes.

The invention discloses a salmonoid reproductive behavior observation device, relates to the field of fish reproductive behavioristics, and aims at researching salmonoid reproductive behavioristics. Four kinds of substrates are laid at the bottom of an experimental cavity of the salmonoid reproductive behavior observation device and equally divides the experimental cavity into four simulated ecological areas, multiple underwater cameras are arranged on the outer wall of the inner ring of the experimental cavity and the inner wall of the outer ring of the experimental cavity, under the combinedaction of the multiple underwater cameras, the whole picture of the experimental cavity can be observed, and a radio frequency tag detection system is used for detecting and recording reproductive behaviors and activity rules of fishes in various simulated ecological areas in the experimental cavity. Detection coils are located between the adjacent substrates, an electric tag is implanted in eachfish in the experimental cavity, the detection coils are used for detecting and recording the electric tags of fishes passing by, and the detection coils can send the detection results to a receiver.Accordingly, related research of the salmonoid behavioristics can be met, and important technical support is provided for fish spawning site repairing and other work.

A method for the aseptic culture of vallisneria used for restoring the aquatic ecosystem and providing the good to fish, shrimp and crab and the spawning site for them, and the fast reproduction of its engineering seedlings is disclosed, which features use of tissue culture and enlarged reproduction.

The invention discloses a device for determining a deepwater spawning site. The device comprises a cylindrical shell with a back cover; a waterproof air bag is arranged in the shell in a folding mode; an ignition coil is arranged in the waterproof air bag; a control circuit and a battery capable of being timed according to needs are connected to the ignition coil; solid ignition materials are arranged nearby the surface of the ignition coil. The ignition coil is controlled by the timed control circuit to ignite the solid ignition materials at specific time, and after the waterproof air bag is rapidly inflated to swell, the back cover is ejected open and breaks away from the cylindrical shell. Identification marks are arranged on the waterproof air bag to determine discharging information. The whole waterproof air bag floats on the sea level, and a research worker can deduce the position of the spawning site according to the discharging information for researching. The device has the advantages that GPS positioning recording is achieved, floating is carried out in a timing mode to mark the geographic positions, the structure is compact, and mass marking is convenient.

The invention discloses a multi-dimensional one-stop investigation method for a spawning fish spawning site on grasses in large water areas of rivers, lakes and reservoirs, and relates to a grass spawning fish spawning site investigation method. Aiming at the problems of fish spawning sites in fishery resource investigation and evaluation and fishery ecological environment protection, the invention aims to solve the problems of non-synchronous and non-timely investigation time, incomplete investigation content and no multi-dimensional investigation method in the existing investigation of spawning fish spawning sites on grasses in large water areas of rivers, lakes and reservoirs. The investigation method is implemented to form a one-stop investigation method of point-line-surface movement,multi-dimensional, omnibearing, long-distance, large-range and carpet-type search on the water surface, underwater and air, the timeliness is high, the efficiency is high, the amount of obtained datainformation is large, scientificity, systematicness and accuracy are high, and the ideal effect of synchronously, rapidly and systematically investigating and observing an investigation water area isachieved. The multi-dimensional one-stop investigation method is applied to the fishery field.

The invention discloses a precise regulation and control system for breeding of fishes laying drifting eggs, and relates to the field of ecological regulation and control of water conservancy water areas. The system comprises a habitat monitoring assembly, a fish sensing assembly, an information fusion assembly and a regulation and control assembly. The habitat monitoring component is used for acquiring habitat factor data of target fishes; the fish sensing component is used for acquiring target fish information; the information fusion component is used for generating an environmental organism fusion data set and determining a spawning site for spawning of the target fish and a first day-by-day water temperature change rate of the water temperature of the spawning site within a preset time period of the starting date; and the regulation and control assembly is used for respectively generating a first precise regulation and control parameter and a second precise regulation and control parameter of the reservoir gate according to the migration regulation and control precise data set and the spawning stimulation regulation and control precise regulation and control parameter set. And a precise regulation and control scheme meeting the roe hatching conditions is generated. By adopting the method, the migration process, the spawning process and the roe hatching process of the target fish can be accurately regulated and controlled.

The invention discloses a building method of a spawning site suitable for fish laying demersal eggs in a torrent. The building method includes the steps of S1, early-stage investigation; S2, spawningsite address selection; S3, flow state adjustment; S4, artificial alluvial flat construction; S5, artificial deep pool construction; S6, artificial sandbank construction; and S7, vegetation recovery.The building method of the spawning site suitable for the fish laying the demersal eggs in the torrent is simple, the problems of river habitat homogenization and fish spawning site damage caused by river sand excavation, desilting, dam, revetment, riverway hardening and other activities are solved, and the ecological functions of rivers, lakes and reservoirs are recovered.

The invention discloses a method for breeding crayfishes in early autumn in a rice field. Through rice field structure transformation, rice stubbles are reserved to create a mating spawning site for the crayfish, crayfish mating and spawning are induced through water level control, obstacles are arranged in a throwing area, parent crayfishes are preferably selected, parent crayfish are fed with afeed, fries are fed with the feed, fry fishing and yield are increased, the crayfish overwintering survival rate is increased, the crayfish fry self-killing probability is reduced, the crayfish fry specification is increased, and the crayfish yield is increased. The success of ecological breeding of early autumn breeding of the crayfish in the rice field is achieved, and large-scale and batch production of early autumn breeding seedlings of the crayfish is achieved.

The invention provides a main stream reservoir ecological operation method considering incoming water from an interval tributary. The eco-hydrological demand for target fish spawning at a downstream main stream spawning site is defined through investigation and research, and high flow pulse meeting analysis related to fish spawning at the main stream and tributary is performed; high flow pulse characteristic indexes of the main stream and tributary over the years are sorted and accounted in the fish spawning period; a main stream reservoir is identified to cooperate the tributary for developing the key indexes of ecological scheduling start-up conditions; important parameters of channel routing are defined according to diachronic hydrological data, and a reservoir ecological operation model is established; and the reservoir ecological operation method considering the incoming water from the interval tributary is achieved. According to the ecological operation method, by considering theincoming water from the interval tributary, the problem of insufficient frequency in the high flow pulse process of a downstream river due to normal operation can be solved, and the high flow pulse process of the downstream river can be improved effectively; and the required hydrological conditions for mass propagation of drifting breeding fish at the spawning site are met.

The invention discloses an intelligent mobile artificial fish nest experiment platform for visco-demersal breeding fishes. The platform comprises an artificial fish nest bed body and an intelligent mobile base, and is characterized in that the artificial fish nest bed body is of a structure shaped like a Chinese character 'tian', four sides of the artificial fish nest bed body are loaded with buoyancy cylinders, and the middle part is provided with an experiment observation camera. Four corners of the intelligent mobile base are respectively provided with a group of Mecanum wheels, and the intelligent mobile base is loaded with an omnidirectional mobile motor, a stable support motor, an intelligent console, a magnetic plate, an underwater camera system and a telescopic hinge. According to the platform, the defect that protection measures for the visco-demersal breeding fishes are lacked at present is overcome, a proper spawning site is provided for the visco-demersal fishes, the influence of underwater topographic changes caused by river and lake water level changes and dam flood discharge on the growth and development of the visco-demersal fish eggs is weakened, the protection effect of the artificial fish nest on the visco-demersal fish eggs is optimized, and more technical bases are provided for the protection of the spawning site of the visco-demersal fish.

The invention relates to a high-yielding and propagating Corbicula fluminea culture method. The method is characterized by comprising the following steps: firstly, selecting a propagating culture area, which is required to be far away from shipping thoroughfares and estuaries for water intake and drainage and cannot be a settled fish spawning site in a lake; secondly, carrying out purse seine in the selected propagating culture area, and controlling the area of a purse seine to 3hm<2> to 5hm<2>, wherein the purse seine should meet the requirements on preventing cultured fishes from escaping and preventing natural enemy fishes of Corbicula fluminea outside the purse seine from entering, and the height of the purse seine should be higher than the highest water level of the culture area over the years by at least 50cm; thirdly, selecting waveless weather, and carrying out fish eradication by adopting a ground cage and netting method; fourthly, carrying out young Corbicula fluminea stocking: selecting Corbicula fluminea, of which the shell length is 0.5cm to 1.2cm, the individual weight is 0.5g to 1g and the number per kilogram is 1,500 to 2,200, as offspring, and carrying out soaking for 10 to 20 minutes in a 2% to 4% common-salt aqueous solution before stocking for disinfecting; fifthly, stocking propagating fishes: selecting Hypophthalmichthys molitrix and Aristichthys nobilis as propagating culture fishes; and sixthly, strengthening daily management. The method disclosed by the invention is simple and is obvious in economic efficiency.

The invention relates to the technical field of insect rearing, and specifically discloses a method for indoor propagation of Bactrocera dorsalis. The method comprises the following steps: Bactroceradorsalis adult rearing; acquisition of Bactrocera dorsalis eggs, namely 8-day-old in summer or 15-day-old in winter Bactrocera dorsalis adults are used, and a culture medium is used as a Bactrocera dorsalis spawning site; Bactrocera dorsalis larva rearing, namely the eggs hatch into larvae in the culture medium, and the larvae feed on the culture medium; and collection of pupa. The method of the invention is used for large-scale propagation of Bactrocera dorsalis, is not restricted by seasons, can rapidly cultivate a large number of Bactrocera dorsalis, and provides experimental materials forthe research on biology, physiology and integrated pest prevention and treatment measures of Bactrocera dorsalis. In the method, the culture medium is used as the spawning site of Bactrocera dorsalisand an egg hatching site, and at the same time, the culture medium is also the feed for larvae, so that an egg collection step is avoided, the mechanical damage to the eggs is reduced, a hatching rateof the eggs is improved, and thereby the purpose of propagation is achieved.

The invention relates to a natural water area fish spawning site identification method, and belongs to the technical field of fish ecosystem protection. According to the fish spawning site identification method, starting from an environment and organism mutual relation rule in an ecological principle, topographic factors with biological significance in a fish habitat water area are extracted by utilizing a geographic information system technology, and an accurate identification conclusion of a target water area spawning site is obtained in a weighted calculation and on-site verification mode.Different from a conventional mode that fish spawning site identification mostly depends on field investigation and field investigation, the method greatly reduces the field investigation work, and eliminates a large amount of field useless investigation through an indoor remote sensing analysis means. Meanwhile, the remote sensing analysis can conveniently realize the full coverage of the targetwater area, is more suitable for the identification of the spawning site of the large-space-scale water area, and effectively reduces the missed inspection and misjudgment of artificial field work.

The invention relates to a spawning device for small brown planthoppers, which is used for detecting the reproductive capacity of the small brown planthoppers in an RNA (Ribose Nucleic Acid) interference test. The device is concretely composed of: a glass tube with openings at two ends, 80-mesh nylon yarn, a rubber band, sterile toothpicks, wetting sterile degreasing cotton and a sealing film (Parafilm). During use, use the 80-mesh nylon yarn to seal one end of the glass tube; then take a toothpick wound by the wetting sterile degreasing cotton, use the sealing film to seal the degreasing cotton, and imitate rice seedlings; put in adult small brown planthoppers to lay eggs, use a layer of sealing film to seal the other end of the glass tube; add artificial feed in the center of the film, then reuse a layer of sealing film to seal the feed; after completion, use a humidifier to conduct mist spray for preserving moisture. The device can solve the problem that the small brown planthoppers do not have a spawning site in the RNAi study of a feeding method, and provides guarantee for successfully carrying out the gene function study.

The invention discloses a portable device and method for hatching and culturing fish eggs and fries. The device comprises a tank body, wherein a water storage bin, a fish egg temporary culture bin, afish egg hatching bin, a fish fry breeding bin, a circulating water filter bin, a filtered water temporary storage bin and a power bin are arranged inside the tank body. According to the device, hatching of fish eggs and culture of fish fries can be realized at the same time due to multiple bins having different functions, the actual requirement for early fish resource investigation and research for river fish spawning site can be met. The device is applicable to simultaneous constant sorted culture of multiple fish eggs and fish fries collected from the river fish spawning site, has the advantages of refined modular design, constant and stable operation, external-connected or built-in power supply, carrying convenience, simple operation, strong practicality and the like, and is suitable for large-scale popularization and application.

The invention discloses a soft-shelled turtle spawning site and relates to the technical field of aquaculture. The soft-shelled turtle spawning site comprises parent turtle ponds. The soft-shelled turtle spawning site is characterized in that each parent turtle pond comprises a spawning site A and a spawning site B, the area of each spawning site is one tenth of that of the corresponding parent turtle pond, the spawning sites are disposed on the north coast of the corresponding parent turtle pond, each spawning site is square, the gradient of one side, close to the corresponding parent turtle pond, of each spawning site is 20-30 degrees, guardrails are formed on the other three sides provided with rainproof covers, and 20-30cm of river sand is laid on each spawning site. The soft-shelled turtle spawning site has the advantages that the ideal spawning environments are provided for parent turtles, the soft-shelled turtles are not affected by the outside during spawning, and culture benefits are increased; every two spawning sites can be used alternatively, embryo fixation of soft-shelled turtle spawns is increased favorably, and interference to the spawning soft-shelled turtles is reduced.

The invention relates to the technical field of water conservancy project ecological protection, in particular to a natural breeding and hatching protection device for specific valuable and rare fishes in the upstream of Yangtze River and a using method. The device comprises a supporting platform; a water insulation tank body; the spawning site identification unit comprises an underwater ground object imager, a visual fish finder, a turntable and a comprehensive discriminator, the underwater ground object imager and the visual fish finder are fixed on the turntable, and the comprehensive discriminator is located in the water separation tank body; the comprehensive discriminator is electrically connected with the underwater ground feature imager and the visual fish finder and is suitable for judging the suitability of the spawning site according to the detection values of the underwater ground feature imager and the visual fish finder; the frequency control sound wave unit comprises a variable-frequency sound wave starter and an underwater energy storage power supply, the variable-frequency sound wave starter is fixed in the water separation tank body, and the underwater energy storage power supply is suitable for supplying power to the variable-frequency sound wave starter. The device can monitor a plurality of continuous breeding processes such as spawning site identification, fish luring, spawning and hatching, so that real-time monitoring and effective protection of roes and juvenile fishes are realized.

The invention discloses a combined type turtle breeding pond. The pond comprises a water pond and a plurality of independent attached ponds, wherein the independent attached ponds are arranged on one side of the water pond; a plurality of standing blocks are arranged on the inner side, which is close to the independent attached ponds, of the water pond; a spawning site is arranged at one end of the water pond; a blocking wall is arranged on the spawning site to separate the water pond and the spawning site; and a door is arranged on the spawning site to be communicated with the water pond; a bank ground is arranged between the water pond and the spawning site; the area, which is close to the bank ground, of the water pond is designed as a slope; and flower and tree grooves with U-shaped sections are formed in upper sides of bounding walls on the another three sides of the water pond in a suspending manner. Places where shade-loving turtles hide are provided through the flower and tree places adopting suspending structures, the male and female turtles are bred separately, one male turtle occupies one independent attached pond, and a group of female turtles occupy the water pond, so that the combined type turtle breeding pond conforms to life habits of the turtles and can facilitate observation and breeding of the turtles in breeding seasons and turtle spawns and protection of the turtles in the breeding seasons and the turtle spawns against damage.

The invention discloses a bottom-sinking type spawning site monitoring device, and aims to provide a bottom-sinking type spawning site monitoring device which can effectively increase the monitoring area of a monitoring device and is not limited by the visual angle of the monitoring device and obstacles in water. The device comprises a base, a bracket arranged on the base, a monitor arranged on the bracket, a water pump arranged on the bracket, a vertical cylinder block arranged on the bracket and provided with an opening in the upper end, a drainage joint arranged on the lower end surface ofthe vertical cylinder block, a connecting pipe connected with the drainage joint and an inlet of the water pump, a piston body slidingly arranged in the vertical cylinder block, a plurality of water inlets formed in the outer side face of the vertical cylinder block, a filter screen cylinder sleeving the vertical cylinder block, a cleaning sleeve sleeving the vertical cylinder block, an upwards floating frame located above the vertical cylinder block, a first connecting rod for connecting the piston body with the upwards floating frame, and a second connecting rod for connecting the cleaning sleeve with the upwards floating frame.

The invention belongs to the technical field of river network ecological research, and particularly relates to a fish habitat protection and habitat construction method based on ecological base flow regulation and control. Habitat protection is carried out on the most important and sensitive fish spawning site in the fish habitat; By ecological flow regulation and control, blocking influence of water retaining buildings and immigrant land reclamation projects on the longitudinal and transverse connectivity of the main river is reduced to ensure the river network has enough fish habitat area; according to the requirement for the applicability of the roe habitat, the required diversified aquatic habitat is provided for fish oviposition, overwintering and bait rearing by arranging the roe gravel marginal beach, the permeable weir, the deep pool area, the log matrix and the aquatic plants.

The invention relates to a method for artificially feeding parasitic wasps by taking mulberry pyralids as hosts. The method comprises the following steps of: collecting mulberry pyralid larvae from a field, putting the mulberry pyralid larvae into a container paved with mulberry leaves, and collecting parasitic wasp cocoons after the parasitic wasp larvae get out of the hosts to cocoon; placing the parasitic wasp cocoons in glass test tubes, and after eclosion of the parasitic wasps, feeding the parasitic wasps with hydromel; adopting raised parasitic wasp adults for parasitism, and during parasitism, utilizing a transparent container as a spawning site, and inoculating the mulberry pyralid larvae for parasitism of the parasitic wasps; after parasitism is finished, collecting the mulberry pyralid larvae and the parasitic wasps respectively, feeding the mulberry pyralid larvae until the offspring wasps of the parasitic wasps get out of the hosts, and allowing the parasitic wasps to be used for subsequent parasitism again. When the method is used for breeding meteorus pulchricornis, the parasitism efficiency is high, the loss is small, the operation is simple and convenient, the cost is low, the host source of the meteorus pulchricornis is expanded, the indoor large-scale production of mulberry pest parasitic wasp meteorus pulchricornis is facilitated, and a good foundation is laid for the field biological control work of mulberry pyralids.