51 results about "Freshwater fish" patented technology

The invention relates to the technical field of freshwater fish culture, in particular to a freshwater fish intelligent detection and grading system based on machine vision, which comprises an image acquisition unit, an image processing unit, an image analysis unit, a grading decision unit and a control and output unit, after the image processing unit extracts a target area, the image analysis unit completes three-dimensional contour reconstruction morphological parameter calculation activity stress evaluation and body surface defect detection; the grading decision-making unit achieves specification and quality two-dimensional grading according to the multi-dimensional features, and the control and output unit drives the execution mechanism to complete sorting and generate a report. Multi-dimensional automatic detection and precise grading of the size, vitality and health condition of the freshwater fish are achieved, full-process automation of freshwater fish grading is achieved, the grading precision and efficiency are improved, the labor cost is reduced, and the method is suitable for large-scale freshwater fish breeding and processing scenes.

The utility model provides a novel freshwater fish catching netting gear which comprises a freshwater fish culture pond, a vertical main beam is placed on the left side wall inside the freshwater fish culture pond, a main beam top beam is embedded between two plates at the top end of the vertical main beam, and a main beam bottom plate is fixed below the vertical main beam. A trapezoid reinforcing frame and a reinforcing triangular side plate are welded between the vertical main beam and the main beam bottom plate, a cylinder body mounting base is fixed to an upper shaft sleeve at the center end of the main beam bottom plate, and through cooperation of a net frame fishing lifting hydraulic cylinder and a fishing net frame left-right moving hydraulic cylinder, lifting and left-right moving of the freshwater fish fishing net frame can be achieved; the fishing operation is accurately carried out in the culture pond, and the fishing efficiency is greatly improved. The trapezoidal reinforcing frame and the reinforcing triangular side plates are welded between the vertical main beam and the main beam bottom plate, the structural strength and stability of the whole fishing net are improved, it is guaranteed that the fishing net can bear certain pressure and tension in the fishing process, and the risk of equipment damage is reduced.

This invention belongs to the field of aquaculture equipment and discloses a recirculating aquaculture system for indoor multi-layered culture of freshwater fish germplasm samples. The system includes a stainless steel culture rack, glass culture tanks, a temperature control system, a recirculating water purification system, an aeration system, and electrical and auxiliary materials. Through a three-layered culture structure design, combined with culture tanks of varying sizes and a precise temperature control module, it solves the problem of aquaculture with diverse sizes of freshwater fish germplasm samples and large differences in suitable water temperatures. The system has nine small glass culture tanks in the upper layer and three large glass culture tanks in each of the middle and lower layers, equipped with an external temperature control component and an internal heating rod, achieving full-coverage water temperature regulation from 10℃ to above 30℃. The recirculating water system ensures stable water quality through the synergistic effect of a filter tank, a booster pump, an ultraviolet sterilizer, and various filter media. Meanwhile, the lower culture tanks are equipped with an internal circulation filter to enhance local water purification, meeting the diverse aquaculture needs from small fry to large broodstock.

The present application relates to the technical field of aquaculture, and especially relates to a high-density and high-benefit freshwater fish circulating water breeding method, which uses a high-density and high-benefit freshwater fish circulating water breeding pond, the breeding pond comprises a pond body, a water inlet pipe and a sewage suction pipe, etc.; a sewage ditch is formed on the pond body; the water inlet pipe is connected to the front side of the pond body; the sewage suction pipe is arranged on the back side of the pond body, and a plurality of branch pipes are arranged on the sewage suction pipe and located in the sewage ditch; the water inlet pipe and the sewage suction pipe are connected to an external filtering device, and a water pump is arranged on the filtering device. The present application realizes that the impurities at the bottom of the pond body are pushed backward to the sewage ditch by the scraper, and the straight plate part of the scraper blocks and limits the impurities in the process of backward movement of the scraper, so that the impurities are not lifted, the sewage passes through the water filtering port when the impurities are moved backward by the scraper, and thus the problem that the collection effect of the impurities is reduced due to the backward movement of the pond water caused by the scraper is avoided.

The invention discloses a multilayer detachable three-dimensional freshwater fish temporary rearing bin which comprises a bin body and a plurality of detachable temporary rearing bins located in the bin body, the temporary rearing bins are slidably arranged in containing grooves formed in the bin body, and the temporary rearing bins located on the same column are vertically aligned at equal intervals to serve as an experimental group. And a communicating assembly movably penetrating through each temporary rearing bin is arranged in each experimental group correspondingly. According to the freshwater fish temporary rearing device, distinguishing, temporary rearing, observation and experimental operation of freshwater fish can be achieved, circulation can be achieved, the communicating assembly is matched, fishes are prevented from entering other temporary rearing bins at the communicating position, connectivity of all the temporary rearing bins is assisted to be slowed down, great help is provided for observation of experimental operation such as virus resistance, infectivity and virus tolerance of the freshwater fish, and the survival rate of the freshwater fish is increased. The method has scientific research value and daily use value.

The utility model provides a multifunctional freshwater fish culture net cage which comprises a culture net cage frame, a freshwater fish net cage pool is arranged in the culture net cage frame and provided with water inlet flowing meshes, the culture net cage frame is provided with a miniature oxygenation pump, the miniature oxygenation pump is connected with an oxygenation pipe through a pipeline, and the oxygenation pipe is connected with an oxygen nozzle. The freshwater fish net cage pool is provided with a circulating pipe. The oxygen increasing system can increase the oxygen content in water, the breathing requirement of fishes is met, the vitality and growth speed of the fishes are improved, and the culture benefits are improved. By arranging a fish feed storage pipe, a fish feed feeding pipe and a fish feed discharging electromagnetic switch, accurate feeding can be achieved, waste of feed is avoided, an escape-proof mesh can effectively prevent fishes from escaping, and breeding losses are reduced. The water inlet flowing mesh holes and the circulating pipe can keep water clean and fresh, a good living environment is provided for fishes, the growth speed and the health condition of the fishes can be improved, and therefore the breeding efficiency is improved.

The utility model relates to the field of food packaging, in particular to an anti-extrusion freshwater fish slice packaging box. The utility model provides an anti-extrusion freshwater fish slice packaging box which can be used for sub-packaging freshwater fish slices, simultaneously reduces the occupied space, is convenient to open according to the eating amount, and prolongs the shelf life of the residual freshwater fish slices. An anti-extrusion freshwater fish slice packaging box comprises a plurality of packaging boxes, rotating doors and the like, and the rotating doors are rotatably connected to the upper portions of the packaging boxes. Freshwater fish slices are subpackaged through the three packaging boxes, then the handle is held to be lifted upwards to drive the rotating sleeve to rotate, and then the handle is held to move downwards, so that the packaging boxes are stacked, the occupied space is reduced while the freshwater fish slices are subpackaged, the packaging boxes are convenient to open according to the eating amount, and the packaging efficiency is improved. And the shelf life of the remaining fillets is prolonged.

In order to prevent the bait from being grabbed by small fishes and enable the bait to smoothly fall to the water bottom in the fishing process, according to the characteristic that the small fishes only grab the bait on the upper middle layer of a water body, a bait ball hung on a hook is soaked into syrup, then put into a dry powder box and coated with light bran which is lighter than the water and added with essence and a small amount of fishbone dust, operation is repeated twice, and then the bait is thrown into the water. When the bait ball descends, water impacts the surface of the bait ball, the two layers of light bran can gradually fall off, disperse and float upwards, the attention of small fishes is transferred, the small-particle light bran which floats upwards is grabbed, and therefore the effect of shelling the cicada shells is achieved, and the bait can completely sink to the water bottom. Due to the fact that the syrup has the water absorption function and is attached to the outer surface of the bait ball, the bait ball cannot become soft and be unhooked, the bait ball is wrapped with a protective layer, meanwhile, the sweet taste of the syrup has allure to freshwater fish, and the fish luring effect of the bait can be improved. According to the scheme, in summer and autumn of 2024, the effect of trapping small fishes to grab baits is very obvious through multiple actual fishing tests of the applicant.

This invention relates to the field of freshwater fish aquaculture technology and discloses an energy-saving dual-cycle freshwater fish spawning pond system and its usage method. The system includes a spawning pond and a culture circulation treatment system connected to the spawning pond. The culture circulation treatment system includes a first circulation tailwater treatment system and a second circulation tailwater treatment system. The first circulation tailwater treatment system includes a side drainage pond connected to the side wall of the spawning pond and a first inlet pond. The second circulation tailwater treatment system includes a vortex egg collection pond connected to the bottom of the spawning pond. The vortex egg collection pond is connected to the spawning pond through a multi-stage sedimentation pond and a second inlet pond. An egg collection pond is connected to the bottom of the vortex egg collection pond. The vortex egg collection pond and the egg collection pond together form the spawning circulation treatment system. The spawning pond system of this invention adopts a dual-cycle treatment system, combining long-term high-density culture, spawning, and automatic egg collection functions. During the use of the spawning pond, water circulation is achieved through air lifting and water propulsion, resulting in high efficiency and low energy consumption.

The utility model relates to the technical field of aquaculture, and discloses an oxygenation device for freshwater fish culture, which comprises a floating seat, an antenna is fixedly mounted at the top end of a waterproof cover, an oxygenation and aeration component for aeration and oxygenation is arranged on the bottom side of the floating seat, three telescopic rods are fixedly mounted on the outer side of the waterproof cover in an array manner, and the three telescopic rods are connected with the antenna. A connector is fixedly installed at the telescopic end of the telescopic rod, a floating ball is fixedly installed at the bottom end of the connector, and an anti-collision protection assembly is arranged on the outer side of the floating ball. According to the oxygenation device for freshwater fish culture, the paddle blades are driven to rotate in water, a water curtain can be formed in a water stirring mode to increase oxygen dissolution, a static water body can be activated, water flow can form bubbles through air holes in the paddle blades, the oxygenation and aeration effect is further improved, and the oxygenation effect is improved. Meanwhile, the protective cover covering the outer side of the paddle blade can prevent nearby fishes from being sucked into vortexes to cause injury.

The utility model relates to a freshwater fish breeding technical field, and the utility model discloses a multi-angle adjustable freshwater live fish photographing device, the isolation frame is fixedly arranged in the transparent water tank, a plurality of baffle plates are arranged in the isolation frame, rotating rods are fixedly arranged on the upper and lower sides of the baffle plate, the lifting mesh plate is movably arranged in the transparent water tank and is located at the left side position of the isolation frame, two threaded rods are rotatably arranged on the lifting mesh plate through screw threads, the lower end of the threaded rod is rotatably inserted on the inner bottom wall of the transparent water tank through the bearing, the connecting frame is fixedly arranged on the left side of the upper portion of the transparent water tank, the driving rod is rotatably arranged in the connecting frame through the bearing, the upper end of the threaded rod is rotatably inserted in the connecting frame through screw threads and is drivenly connected with the driving rod through the bevel gear pair, the motor is fixedly arranged on the front side wall of the connecting frame, the camera is fixedly arranged on the three-axis electric pan-tilt head, the activity range of fish can be limited, the fish need not be frequently fished out to cause the stress reaction, and the fish can also be prevented from swimming randomly to be difficult to capture the clear photo.

The invention discloses a method for extracting fish oil from viscera of freshwater fish, which comprises the following steps: removing gall bladder, swim bladder and intestinal digests in the viscera of freshwater fish, cleaning, draining, and crushing to obtain viscera paste; putting the minced viscera into deionized water, carrying out microwave treatment, then adjusting the pH value to 6.5-7.5, and then adding neutral protease and an antioxidant to carry out enzymolysis reaction, so as to obtain an enzymolysis mixture; and performing centrifugal layering on the enzymolysis mixture, collecting a fish oil layer, and performing distillation purification to obtain the fish oil. According to the extraction method disclosed by the invention, a microwave-assisted enzymolysis technology is adopted to accelerate a reaction process, an oil-soluble natural antioxidant in-situ antioxidant technology is combined to inhibit fat oxidation, and the fish oil is purified by a molecular distillation technology, so that the product quality is improved; the technology can improve the fish oil extraction efficiency, reduce the production cost, reduce the environmental pollution, and ensure the high quality and high purity of the fish oil.

A separation and purification device for freshwater fish suction metacercaria relates to the technical field of metacercaria separation and purification devices, and comprises a closed reaction box, the closed reaction box is composed of four sections of detachable structures in threaded connection, a coaxial double-layer tool bit is arranged in the box, and the rotating speed is controlled by a motor to realize high-speed crushing of fish meat and low-speed stirring of digestive juice; spraying heads are arranged on the circumference of the upper portion of the box body to prevent materials from hanging on the wall. Simulated human body digestive juice is injected into digestive juice pipes in stages. The box body is provided with a primary gradient filter screen and a secondary gradient filter screen, and graded enrichment of metacercaria is achieved in cooperation with a bottom collecting A heater, a temperature sensor and a controller are integrated outside, a constant-temperature digestion environment is maintained, and metacercaria is inactivated at high temperature after treatment. The device adopts an integrated closed design, aerosol pollution is effectively avoided, mechanical crushing, biological digestion and physical inactivation technologies are combined, the metacercaria extraction efficiency, obtaining quantity and operation safety are remarkably improved, and the device is suitable for the field of parasite detection of laboratories and medical institutions.

The invention discloses application of ginseng leaf polysaccharide in relieving fish quality decline caused by water hypoxia, and belongs to the technical field of aquatic product culture. The ginseng leaf polysaccharide is applied to relieving fish quality decline caused by water hypoxia for the first time, and by adding the ginseng leaf polysaccharide, the problems of fish muscle oxidative damage, poor texture property, low nutritional value and the like caused by hypoxia stress can be effectively improved; the invention provides a new relieving technology for improving fish quality decline caused by hypoxia in culture, provides technical support for improving fish quality of cultured fishes under intensive culture conditions, improves freshwater fish culture benefits, and solves the problem of lack of a safe and reliable method for relieving fish quality decline caused by hypoxia in a water body at present.

The invention discloses a technology for salinizing slimming fish by using mountain spring water, and relates to the technical field of fish fries, and the technology comprises the following steps: step 1, culturing fish fries, step 2, conditioning and treating wounds by using Chinese herbal medicines, and step 3, salinizing and slimming. In the step 1, various types of freshwater fishes can be bred, fish fries are put into a common fish pond for breeding, feeding is performed every day, and adult fishes are bred, and in the step 2, the adult fishes are put into a new fish pond, and medicaments are added for conditioning and preventing saprolegniasis. According to the step 3, sea salt of 5-15 DEG C is added into water according to different fish fingerlings, a circle of sea salt is evenly scattered on the periphery of the fish pond at the beginning, the sea salt is dissolved and kept for one week, water is changed after one week, the sea salt is added again, the content of the sea salt is increased by one degree at the moment, circulation is conducted in this way, one part of sea salt is added every week, the salt tolerance of the freshwater fish is increased, and the freshwater fish can appear on the market after 30-60 days. According to the present invention, the meat quality of the fish can be well changed, the fish has no mud taste and no fishy smell, the meat quality is firm, fresh and sweet, the parasites in the fish body can be completely killed, and the harmful bacteria can be reduced to the minimum.

The present application relates to the freshwater fish culture technical field, especially be a kind of freshwater fish intelligent detection and grading system based on machine vision, including image acquisition unit, image processing unit, image analysis unit, grading decision unit and control and output unit, image acquisition unit acquires multi-view image sequence under controlled illumination environment, after target area is extracted by image processing unit, image analysis unit completes three-dimensional profile reconstruction form parameter calculation activity stress evaluation and body surface defect detection;Grading decision unit realizes double-dimension grading of specification and quality according to multidimensional characteristics, and control and output unit drives actuating mechanism to complete sorting and generate report.The present application realizes the multi-dimension automatic detection and accurate grading of the size, activity, health condition of freshwater fish, realizes the whole process automation of freshwater fish grading, improves grading accuracy and efficiency, reduces labor cost, and is suitable for large-scale freshwater fish culture processing scene.

The utility model relates to the field of fish culture ponds, in particular to an ecological circulation freshwater fish culture device, which adopts the technical scheme that the ecological circulation freshwater fish culture device comprises a culture pond, a collection box, a planting net plate, a water stop plate, a bottom cleaning block, a reset spring and a micro water pump, the water stopping plate can be driven to ascend along the inner wall of the third groove body by pulling the handle so as to control the water stopping plate to be opened and closed, and therefore the mobility of water between the culture pond and the collecting box is controlled, the water stopping plate can be driven to ascend along the inner wall of the third groove body, and the water quality is improved. The reset spring can drive the handle and the water stop plate which lose handheld power to descend and reset, and the servo motor can drive the lead screw to drive the front support and the rear support to drive the bottom cleaning block to conduct reciprocating scraping and cleaning along bottom sediment of the culture pond. And sediments at the bottom of the culture pond can be scraped into a collecting box to be automatically collected.

The invention relates to a method for detecting freshwater fish ichthyophthirius multifilis, which is characterized in that a visual LAMP (loop-mediated isothermal amplification) rapid detection method is established by using 18sRNA (ribonucleic acid) gene of ichthyophthirius multifilis as a specific target gene through a specific primer, and a PCR (polymerase chain reaction) solution containing HNB dye and Bst DNA (deoxyribonucleic acid) polymerase are adopted to carry out loop-mediated isothermal amplification reaction, so as to detect the ichthyophthirius multifilis. According to the method, visual detection of ichthyophthirius multifilis can be achieved within 20 min, professional knowledge or special fluorescent dye is not needed, and whether a sample contains the ichthyophthirius multifilis or not can be judged only by observing the color of an amplification product. The method can be used for detecting ichthyophthirius multifilis of which the plasmid DNA concentration of a sample is as low as 0.01 ng / mu L, and is high in sensitivity and good in specificity. According to the method, rapid early warning can be achieved in the early outbreak stage of the ichthyophthirius multifilis, early discovery and early prevention are achieved, economic losses are reduced, and the method has wide application prospects.

The application discloses a fish rotten product processing method, and belongs to the technical field of aquatic product deep processing and food processing, and steps include: raw material pretreatment and preparation of composite puffing aid, chopping and emulsifying and micro-bubble introduction, low-temperature pre-gel forming, gradient microwave-hot air combined puffing, and rapid cooling. The application realizes pore uniformization by constructing a moderate cross-linking puffable weak gel network, introducing micro-bubble stabilizing technology, and replacing traditional oil frying with gradient microwave-hot air combined puffing, and prepares fish rotten products with uniform honeycomb porous structure, low oil content and excellent taste, and the parameter linkage control can be simultaneously applied to marine fish and freshwater fish raw materials. The application has novel process, remarkable synergistic effect, excellent product texture, and good industrial application prospect.

The utility model provides circulating water treatment equipment for a freshwater fish culture pond, which relates to the technical field of culture pond water treatment and comprises a filter tank, a culture pond body is arranged on one side of the filter tank, a filter cartridge is arranged on one side of the culture pond body, and a sealing cover is mounted at the top end of the filter cartridge. The bottom surface of the culture pond body fixedly communicates with a blow-off pipe, the end, away from the culture pond body, of the blow-off pipe penetrates through the sealing cover and extends into the sealing cover, a filter screen plate is installed on the inner ring of the filter cylinder, and a disinfection tank is arranged on one side of the filter box. According to the circulating water treatment equipment for the freshwater fish culture pond, through the quartz sand filter layer, the biological filler layer and the activated carbon adsorption layer in the filter box, finer particle impurities can be filtered out, harmful substances such as ammonia nitrogen in water can be decomposed through the microbial action, meanwhile, peculiar smell can be effectively adsorbed, and the water quality is improved. Then, the water quality purification effect is improved by utilizing multi-stage filtration, and the circulating treatment effect on the water body is improved.

The application discloses a low-carbon feed for reducing the body fat rate and nitrogen and phosphorus discharge of freshwater fish by using Phaeodactylum tricornutum powder, and belongs to the technical field of aquaculture. The low-carbon feed is obtained by replacing part or all of soybean meal protein in the feed with Phaeodactylum tricornutum powder. The Phaeodactylum tricornutum powder can reduce the body fat of freshwater fish by inhibiting fat synthesis related genes and promoting fat decomposition related genes, and can reduce phosphorus discharge and improve the phosphorus retention rate through the AMPK / autophagy pathway. After the Phaeodactylum tricornutum powder is used to replace the soybean meal in the feed, the decomposition of fat and the utilization of nitrogen and phosphorus can be promoted.

The invention discloses a self-adaptive freshwater fish scaling and sectioning all-in-one machine, and belongs to the technical field of aquatic product processing mechanical equipment. The all-in-one machine is sequentially provided with a scaling module, a conveyor belt self-adaptive centering conveying module, a gill removing module, a laparotomy module and a viscera removing module along a processing assembly line. The device is characterized in that the conveyor belt module adopts a symmetrical rocker arm connecting rod mechanism to realize self-adaptive adjustment of the clamping width; the belly cutting module is provided with a follow-up lifting mechanism and is matched with real-time fish belly contour detection to realize accurate cutting; the viscera removing module adopts a profiling brush wheel to clean the abdominal cavity; and the gill removing module realizes automatic gill removing. The equipment is high in integration level and strong in adaptability, and integrated automatic processing from scaling to viscera removing of various freshwater fishes is realized.

This utility model relates to the field of fishing equipment technology and discloses a deep-sea intelligent fishing net for freshwater fish in lakes. It includes a fishing net placed underwater and a fixed base embedded on the shore. A winch is fixedly installed on the top of the fixed base, and a take-up rope is wound around the outside of the winch's take-up roller. Fixed rings are fixedly installed at the four corners of the top side of the fishing net, and ropes are fixedly installed on the top of the fixed rings. A connecting seat is fixedly installed at the other end of the ropes. A gathering component for lifting the fishing net above the water surface is provided on the outside of the ropes. Starting the servo motor drives the main pulley to rotate, which in turn drives the secondary pulley to rotate via the transmission belt. This causes the gears to roll along the outside of the ropes, moving the entire outer shell closer to the fishing net. Simultaneously, the buoyancy of the main float and side floats further lifts the fishing net upwards, facilitating the harvesting of adult fish and improving harvesting efficiency.

The utility model provides a novel freshwater fish factory recirculating aquaculture system which comprises an aquaculture pond, a vertical flow precipitator, a microfilter pond, a biochemical air floatation pond, a sand cylinder filter, a nano denitrification system and a multi-stage air stripping system, the aquaculture pond is respectively connected with the vertical flow precipitator and the microfilter pond, the vertical flow precipitator is connected with the microfilter pond, the biochemical air floatation pond is connected with the sand cylinder filter, and the nano denitrification system is connected with the biochemical air floatation pond. The biochemical air floatation tank is connected with the microfilter tank through a pipeline, the biochemical air floatation tank comprises an air floatation bin, a pump bin, a biochemical bin and a denitrification bin, and the pump bin is respectively connected with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system through pipelines; and circulating pumps are arranged on pipelines for connecting the pump bin with the sand cylinder filter, the nano denitrification system and the multi-stage air stripping system. According to the utility model, the multi-stage cooperative treatment system is constructed and the denitrification system is introduced, so that the total nitrogen removal rate of the culture system is increased to 96%, which is increased by 140% compared with that of the traditional system, the water supplementing amount of the system is reduced, the daily water supplementing amount is reduced to be less than 3%, and the water-saving rate of the total circulating water amount is more than 70%.

This utility model relates to the field of fish farming technology and discloses a ring-shaped spawning induction tank for freshwater fish breeding. The tank includes a tank body with a sloping bottom plate fixedly installed on the lower inner wall. A bottom sealing plate is fixedly installed at the bottom of the tank body. A sealing rotating ring A is embedded inside the sloping bottom plate. A connecting pipe is rotatably installed inside the sealing rotating ring A. A sealing gasket is fitted on the outer side of the connecting pipe and embedded in the inner wall of the sealing rotating ring A. Through holes are provided on the sloping surface and top of the connecting pipe. A motor reducer drives a drive gear to rotate, which in turn drives a transmission gear to rotate. The transmission gear rotates the connecting pipe synchronously, which in turn rotates four curved scrapers that slowly rotate. The curved scrapers are bent and scrape the excrement towards the central connecting pipe, thus automatically cleaning the excrement from the sloping bottom plate.

The utility model relates to the technical field of aquaculture, and discloses large-water-surface freshwater fish ecological bait suspension equipment which comprises a shell, a main floating block for providing buoyancy is arranged at the bottom of the shell, a bait guiding chamber for guiding bait is arranged in the shell, a photovoltaic panel is arranged on the outer side of the shell, and the photovoltaic panel is connected with the main floating block. A plurality of discharging holes are formed in the bottom wall of the material guiding chamber in a penetrating mode, discharging pieces are arranged at the positions, corresponding to the discharging holes, in the material guiding chamber, sliding grooves are formed in the positions, corresponding to the discharging holes, of the shell, and triggering pieces used for blocking the discharging holes and starting the discharging pieces are arranged in the sliding grooves. The bionic bait can attract fish schools to gather, the fish schools bite the bait and pull the pull wire, the baffle can be pulled not to block the discharging hole any more, the first guide rod can be driven to be close to the second guide rod, then the contact pieces on the two sides abut against and make contact, the switch can be triggered to start the discharging piece, and then the bait can be put downwards; and waste of baits can be avoided as much as possible.

The invention belongs to the technical field of freshwater fish temporary rearing, and discloses a freshwater fish temporary rearing and quality improving system based on micro-flowing water purification and a rearing method.The system comprises a temporary rearing pond, a first still water pond, a second still water pond, a bottom plate, a stirring assembly, an auxiliary assembly, a medicine adding assembly, a circulating assembly and a filtering assembly; the first still water pool and the second still water pool are fixedly arranged on the opposite sides of the temporary culture pool respectively, one side of the temporary culture pool is communicated with the first still water pool through a first micro drain hole, and the other side of the temporary culture pool is communicated with the second still water pool through a second micro drain hole. Interference of water temperature or pH value fluctuation on normal metabolism of fishes is avoided, the problem of fish quality deterioration caused by unstable temporary rearing environment is effectively relieved, and proper growth and temporary rearing conditions are provided for the fishes.

The utility model relates to the technical field of freshwater fish culture, and discloses a wastewater treatment device for a freshwater fish culture pond, the wastewater treatment device comprises a base, a treatment shell is arranged in the middle of the upper surface of the base, and a first liquid storage structure and a second liquid storage structure are symmetrically arranged on the two sides of the treatment shell; a first treatment cavity and a second treatment cavity which are inclined are formed in the treatment shell, the first treatment cavity and the second treatment cavity are distributed in the treatment shell in an up-down cross mode, and a first filtering mechanism and a second filtering mechanism are detachably installed in the first treatment cavity and the second treatment cavity correspondingly; and a rotating shaft is fixedly mounted at the bottom of the treatment shell, and one end of the rotating shaft penetrates out of the rotating groove and is fixedly provided with a crank. The first filtering mechanism is cleaned, meanwhile, the waste water treatment work is not affected, and the waste water treatment efficiency is improved.

The application discloses a bacillus megaterium strain for increasing adversity tolerance of aquatic animals and application thereof. The bacillus megaterium strain is named bacillus megaterium SCAU-Ohb1, the strain has been preserved in the Guangdong Microbial Culture Collection Center, the preservation number is GDMCC NO.62119, and the preservation date is December 13, 2021. The bacillus megaterium SCAU-Ohb1 is isolated from fish intestinal tracts and is safe to fish bodies. After the fermentation liquor of the bacillus megaterium SCAU-Ohb1 is mixed with a basic daily ration and is used for feeding freshwater fish, the activity of important antioxidant enzymes in the fish bodies can be significantly improved, the salt tolerance of gill tissues of the freshwater fish under acute salt stress can be increased, and the survival rate of the fish bodies can be improved. The application provides a new method for improving adversity tolerance of aquatic animals, has important significance for the aquaculture industry, and is expected to improve production efficiency and reduce losses.

The utility model discloses a freshwater fish culture pond oxygenation device which comprises a bearing top table, the bottom of the bearing top table is fixedly connected with a protective net frame through a support, the top of the bearing top table is fixedly connected with a motor through a support, and an output shaft of the motor is fixedly connected with a rotating rod through a coupler. The utility model relates to the technical field of freshwater fish culture. According to the oxygen increasing device for the freshwater fish culture pond, the air outlet pipes are installed on the two sides of the bottom of the bearing top table through the transverse bases and the telescopic openings and used in cooperation with the L-shaped pulling plates and the inclined face pressing bases, and due to the arrangement of the structures, the conveying range and the conveying amount of oxygen can be increased through the multiple air outlet pipes; and when the inclined surface pressing seat rotates, the L-shaped pulling plate can be extruded to drive the air outlet pipe to continuously lift, so that impurities and stains on the surface of the air outlet pipe are scraped by the scraping barrel, the smoothness of oxygen delivery is ensured, and meanwhile, the subsequent cleaning and maintenance work is facilitated.