96 results about "Saltwater fish" patented technology

The invention relates to method for obtaining collagen from animal sources such as fresh or saltwater fish, chicken, eggs or from parts of these animal sources that can be considered waste, and to a collagen hydrolysate obtained as a result of this method.

The present disclosure relates to the technical field of marine fish cultivation and breeding, and in particular to an industrialized cultivation method for a Cephalopholissonnerati fry. The method includes: a step of sequentially performing food acclimation and nutrient enrichment on a Cephalopholissonnerati parent fish under conditions of 25-29° C. of water temperature and running water, to obtain the parent fish with mature gonad development, and other steps.

The invention provides a seawater fish freshness detection method and device based on machine vision and FPS, and relates to the technical field of prefabricated aquatic product nondestructive detection.The device comprises a mounting box, an automatic lifting clamp device is arranged at the inner bottom of the mounting box, and a fixed-distance pressing device is arranged at the position, corresponding to the automatic lifting clamp device, of the top of the mounting box; a top image shooting device is arranged on the fixed-distance pressing device, an infrared sensing positioning device corresponding to the fixed-distance pressing device is arranged in the mounting box body, a side industrial camera is arranged on one side of the interior of the mounting box body through a first support, a plurality of lighting devices are arranged on the upper portion of the side wall of the mounting box body, and a control unit is arranged at the bottom of the mounting box body; the top image shooting device, the infrared sensing positioning device, the side industrial camera, the automatic lifting clamp device, the lighting device and the fixed-distance pressing device are all electrically connected with the control unit. According to the invention, high-efficiency and automatic seawater fish freshness detection can be realized.

The invention belongs to the technical field of biology, and particularly discloses a high-temperature-resistant antibacterial protein Cystatin B sourced from marine fish as well as a preparation method and application of the high-temperature-resistant antibacterial protein Cystatin B. The high-temperature-resistant antibacterial protein Cystatin B is derived from pomfret, and the amino acid sequence of the high-temperature-resistant antibacterial protein Cystatin B is as shown in SEQ ID NO. 1; the nucleotide sequence of the gene for coding the high-temperature-resistant antibacterial protein Cystatin B is as shown in SEQ ID NO.2, and the sequences of primers adopted for cloning the gene are as shown in SEQ ID NO.3-4. The high-temperature-resistant antibacterial protein Cystatin B has a remarkable antibacterial effect on gram-negative bacteria such as escherichia coli, vibrio parahaemolyticus and edwardsiella tarda as well as gram-positive bacteria such as staphylococcus aureus; and after being treated at the temperature of 100 DEG C, the antibacterial agent still can keep relatively high antibacterial activity. The antibacterial protein is simple in preparation method, can replace traditional antibiotics, and can quickly and efficiently prevent and treat various common bacterial diseases in aquaculture.

The invention relates to marine fish breeding, and particularly discloses an indoor full-artificial breeding method for black epinephelus, which specifically comprises the key technical links of nutrient enrichment of parent fish, hormone induced spawning, artificial insemination and fertilized egg incubation, indoor breeding of fry, compound feed domestication and the like. By controlling water temperature, illumination, salinity and nutritional conditions, synchronous maturation and efficient ovulation of parent gonads of the epinephelus nigatosus are achieved, the fertilization rate reaches 95% or above, and the hatching rate exceeds 85%. According to the method, the whole-process artificial controllable breeding of the epinephelus nigatosus from the parent fish to the fry is realized, a new variety is provided for the epinephelus culture industry, and a feasible technical approach is also provided for the artificial breeding and improved variety breeding of the wild epinephelus nigatosus in the island reef of the South China Sea.

The invention discloses a method for separating, purifying and transplanting spermatogonial stem cells of lateolabrax japonicus, the spermatogonial stem cells of lateolabrax japonicus are separated and purified, marine fish larvae or freshwater fish larvae are used as receptor larvae, and then the spermatogonial stem cells of lateolabrax japonicus are transplanted to abdominal cavities of the receptor larvae. The spermatogonial stem cells obtained through separation are complete in number, structure and function and low in cell clustering rate. After the transplanted spermatogonial stem cells are subjected to fluorescence labeling, the migration and proliferation processes of donor germ cells can be observed in receptor fishes of marine fish fries or freshwater fish fries, so that the receptor fishes with the chimeric germline are obtained. According to the method, through xenotransplantation of the spermatogonial stem cells, a'belly borrowing reproduction 'breeding mode is provided for the marine fishes, a new way for gamete preservation and rapid propagation is provided for the marine fishes with the long reproductive cycle, and a new method and a new thought are provided for genetic improvement and germplasm resource preservation.

The invention provides a full-indoor artificial breeding method for plectropomus leopardus, and belongs to the technical field of artificial breeding of marine fishes. The full-indoor artificial breeding method for the plectropomus leopardus comprises the steps of earlier-stage incubation of fertilized eggs, incubation in an indoor breeding pond, breeding in an indoor flowing water pond, breeding in an indoor circulating water pond and the like. By regulating and controlling illumination, the irritability of the fries is greatly reduced, the ecological conditions of the fries are effectively optimized, and the health condition and adaptability of the fries are improved. Meanwhile, different types and different total amounts of biological bait combinations are fed in the larva stage, the juvenile stage and the fish stage of the plectropomus leopardus, transition is made in each bait transfer period, enteritis caused by excessive intake of larvae and juveniles and too little intake caused by inadaptation of bait transfer are effectively reduced, and the problem that the survival rate is low in the bait transfer period can be effectively solved.

The invention discloses a large-size seawater fry factory-like grading cultivation system, and relates to the technical field of aquaculture. The system comprises a first-stage culture pond, a second-stage culture pond and a third-stage culture pond. The first-stage culture pond is connected with the second-stage culture pond through a conveying pipeline, and the second-stage culture pond is arranged in the third-stage pond. The first-stage tank is provided with an independent first circulating water filtering device and a monitoring unit, and the second-stage tank and the third-stage tank share a second circulating water filtering and monitoring unit. Each monitoring unit integrates growth detection, environment regulation and control and disease early warning functions. The first-stage pond is used for cultivating newly hatched larvae, and the larvae are automatically transferred to the second-stage pond through a conveying pipeline when developing to a juvenile fish stage; the second-stage pond and the third-stage pond jointly form a polyculture environment, and when the juvenile fish reaches the target specification, a cage door is opened, and the juvenile fish is transferred into the third-stage pond. According to the system, through grading environment control and an automatic transfer mechanism, efficient breeding of fish fries from larva fish to large-scale fish fries is achieved, and the problems of uneven growth, low sorting efficiency and the like in traditional fish fry breeding are solved.

The proposed invention corresponds to a fish treatment system for disinfection and deworming in situ, using a system of tubes for the transport of live fish throughout the system in fresh water, obtained directly from salt water or spring water. sea, where the fish are transported by the different sections of the disinfection system from the diseased fish farming unit, through the treatment pond and to the treated fish farming unit, where the removal of parasites in fresh water It is carried out by chemical, electrochemical, mechanical and energetic means, in the treatment pond and later, the treatment water is treated for the removal of medicine and finally reconstituted to the initial conditions (sea water) to be returned to the environment.

The invention discloses a fish and shellfish symbiosis seaborne net cage culture system and method, and relates to the technical field of aquaculture, and the method comprises the following steps: arranging a culture net cage in an offshore sea area; fish fries are put into a surrounding net, bivalve shellfishes are put into a shellfish culture piece cage, and the shellfish culture piece cage is hung in the culture net cage; feeding bait irregularly, checking the integrity of the shellfish culture cage and the covering condition of attachments regularly, and making a treatment means according to the covering rate; in the later period of culture, the adult fishes with the body length exceeding a preset value are caught irregularly in a fishing mode, and after the culture period is finished, the remaining adult fishes are caught in a concentrated mode by increasing the height of the purse seine; the shellfish culture piece cage is lifted out of the water surface to collect adult shellfish. The culture system disclosed by the invention comprises a culture net cage and shellfish culture piece cages, wherein the shellfish culture piece cages are hung in a purse seine. According to the method, mutualism of marine fishes and bivalve shellfish can be achieved, the resource utilization rate and the culture benefits are improved, and diversified fishery development can be achieved.

The utility model relates to a marine fish large-scale fry breeding incubation net cage, which comprises at least one incubation net cage, each incubation net cage comprises an outer cage body, an isolation flexible film is arranged at the position 1 / 3 away from the bottom in the outer cage body, a net bag is arranged in the outer cage body above the isolation flexible film, a through rotating main shaft is arranged in the outer cage body below the isolation flexible film, and the rotating main shaft is connected with the isolation flexible film. Fan blades are fixed on the rotating main shaft at intervals, the fan blades are oval, the rotating main shaft is located at the non-midpoint position of the long axis of the fan blades, and every two adjacent fan blades are symmetrically distributed with the rotating main shaft as the axis; one end of the rotating main shaft is connected with a transmission assembly; and the other end of the rotating main shaft extends into the adjacent hatching net cage. The fan blades which rotate along with the rotating main shaft to alternately jack up different positions of the bottom of the net bag are arranged at the bottom of the hatching net cage, so that roes deposited at the bottom of the net bag are turned over, oxygen deficit of the roes is avoided, the number of the roes placed in a single net cage can be properly increased, and the hatching scale is increased.

The present invention relates to the technical field of aquaculture and breeding of seawater fishes, in particular to an industrialized cultivation method for cephalopholis sonnerati fry, comprising the steps of successively subjecting parent fishes of cephalopholis sonnerati to feed domestication and nutrient enrichment at a water temperature of 25-29°C and under a flowing water condition, so as to obtain parent fishes with fully developed gonads, etc. The present invention takes strict measures for fry quality control and infectious disease prevention and control during industrialized workshop cultivation, so as to effectively optimize the growth conditions of fry, thus increasing the growth rate and improves the health conditions and adaptability of fry while reducing the risk of diseases. By means of standardized breeding management and technical means, the growth environment and feeding management of fry can be controlled, thus effectively improving production efficiency. The cultivated cephalopholis sonnerati has the advantages of fast growth rate, high disease resistance, strong vigor, tender and delicious flesh and good market prospects.

The invention relates to a preparation method of a high-quality low-value marine fish surimi product, which comprises the following steps: S1, semi-unfreezing and dicing frozen hairtail surimi to obtain surimi blocks; s2, the minced fillet blocks are subjected to blending including empty blending, salt blending and seasoning blending in sequence, seasoning blended minced fillet is obtained, composite gel is added in the seasoning blending process, the composite gel is prepared by dissolving tamarind gum, konjac glucomannan and tea polyphenol according to the weight ratio of 1: 9: 0.1 with water, adjusting the pH value to 9-11, placing the mixture in a 85 DEG C water bath to be heated for 10 min and cooling; s3, filling the seasoned minced fillet into a casing for forming, then performing two-stage water-bath heating and shaping, and cooling with ice water to obtain the hairtail sausage. According to the invention, novel natural polysaccharide composite gel of tamarind gum-konjac glucomannan-tea polyphenol is added, and the composite gel can be subjected to dual binding action with myofibrillar protein and bound water of the surimi to form a uniform and compact three-dimensional network structure, so that the water binding capacity and the gel strength of the frozen surimi are improved, and the quality of the frozen surimi is improved.

The application discloses a kind of mild extraction observation counting device and method of marine fish fry, and device includes sequentially connected suction line, observation platform, weak fry sorting device and overflow drain pipe.Suction line is equipped with variable frequency negative pressure pump and transparent steel wire hose;Observation platform is equipped with multistage slow-flow buffer structure inside, and observation area and shooting fixed mechanism are equipped in side and top;Weak fry sorting device is equipped with cyclone flow guide structure inside, and form rotating flow field, so that weak fry is detained in central slow-flow area and is discharged through bottom discharge port, and healthy fry is discharged from top with outside water flow;Overflow drain pipe inlet is bent upwards, and automatic overflow drainage is realized.The application integrates fry mild suction, dynamic counting, cyclone weak fry elimination, automatic drainage and raw water replacement, has no exposed metal, high waterproof level, adapts to seawater environment, significantly reduces fry damage rate and labor cost, and is especially suitable for transportation and screening of marine fish fry such as Epinephelus, Pseudosciaena crocea and the like.

This invention relates to the field of aquatic compound feed technology, specifically to a special feed for mullet, silver carp, and golden carp cultured in saline-alkali land in Northwest China. The feed is characterized by being composed of the following raw materials by weight percentage: 10%–14% alfalfa meal, 16%–22% soybean meal, 16%–22% corn meal, 5%–7% molasses, 1%–3% yeast powder, 2%–5% lactic acid bacteria preparation, 2%–5% premixed feed for aquatic life in saline-alkali land in Northwest China, 1%–4% fish oil, and 1%–5% vegetable oil. This invention solves the problems of low survival rate, high feed conversion ratio, easy antagonistic inactivation of probiotics, fish oil oxidation, poor water resistance of pellets, and insufficient regional adaptability of traditional feeds. Compared with commercially available ordinary marine fish feeds, the survival rate of juvenile fish is increased by 15% to 30%, the feed conversion ratio is reduced by 10% to 20%, the Vibrio inhibition rate is ≥80%, the power consumption per ton of feed is reduced by 25% to 35%, and the raw material cost is reduced by 30% to 45%. It is suitable for large-scale aquaculture in saline-alkali land in Northwest China and has important value for improving the quality and efficiency of fisheries, ecological restoration, and rural revitalization.

The invention provides a compound feed additive for relieving stress response of marine fishes, which is prepared by the following steps: mixing raw materials such as hermetia illucens protein and the like to prepare a premix, and embedding the premix by using a lac-glycyrrhizic acid system to prepare lac microcapsules; then modifying the fucoidin by adopting glycyrrhizin and gamma-linolenic acid, embedding rhodosporidium palustris and bacillus pumilus by using the fucoidin to prepare compound bacterium nano-particles, and finally mixing the lac microcapsules and the compound bacterium nano-particles in proportion. According to the invention, excessive secretion of cortisol of marine fish can be effectively inhibited, hermetia illucens protein provides rich nutrition and reduces muscle decomposition, and compound microorganisms are beneficial to maintaining intestinal microecological balance and improving the utilization rate of nutrition. The prepared compound feed additive can be directly splashed into a culture or transportation water body or added into a feed, so that the stress reaction of the marine fish is effectively relieved, the survival rate of the marine fish is increased, and powerful support is provided for culture of the marine fish.

The invention discloses seawater fish ecological lamplight trapping equipment, and belongs to the technical field of fishing, the seawater fish ecological lamplight trapping equipment comprises a trapping box, the trapping box is provided with a net cage of a box body structure, nettings are arranged on all the surfaces of the net cage in a penetrating mode, and second open holes are formed in the nettings on at least one side face of the net cage; a lamplight assembly with a lamp body is arranged in the net cage; the trapping box is connected with a buoyancy assembly arranged on the water surface through an anchor rope. The problems that an existing net cage is single in interception structure, the fishery catch escape risk is high, a lamplight assembly is prone to displacement or accumulation due to water flow impact, and the attraction effect cannot be continuously and evenly achieved are solved.

The application discloses a kind of construction method and application of seawater fish muscle stem cell line, culture medium with basic medium as background medium;Culture medium includes LIF growth factor, EGF growth factor and leopard bristletooth-derived FGF2 protein;The final concentration of leopard bristletooth-derived FGF2 protein is 20~30 ng / mL, 30~45 ng / mL, 45~55 ng / mL or 55~70 ng / mL. Through the medium, immortalized seawater fish muscle stem cell line with good stability, cell division vigorous, short subculture time can be constructed, and can be stably subcultured for more than 50 generations. It provides raw materials for exploring the function of myoblasts, gene regulation mechanism, and provides the prerequisite for in vitro verification experiment for further exploring the influence of seawater fish muscle stem cells on growth rate, and lays a foundation for good strain breeding of seawater fish.

The application provides a turbot compound immune enhancer, a preparation method and application thereof. The application discloses application of a composition containing a series of components in preparation of a turbot immune enhancer, and the immune enhancer can effectively improve expression of a proinflammatory related gene of the turbot, reduce a number of bacteria in a liver or an intestinal tract, enhance a bactericidal capacity of the turbot, enhance an antioxidant stress capacity of the turbot, relieve liver damage of the turbot after being infected by bacteria, and relieve tissue damage of the turbot after being infected by bacteria. The immune enhancer component is simple, environment-friendly, low in cost and ideal in effect, and provides a new scheme for improving a breeding level of marine fish and improving a survival rate.

To provide a method for using Antrodia cinnamomea essential oil for anesthetic treatment of spotted seabass, in which a problem to be solved is the feasibility of using Antrodia cinnamomea essential oil, which is a natural plant extract, as a new anesthetic to anesthetize live fish, and reduction in stress reaction and tissue damage in the process of anesthetizing live fish.SOLUTION: After spotted seabass is anesthetized by adding Antrodia cinnamomea essential oil in water, the morphological structure of the gill tissue of the spotted seabass and the influence on physiological, biochemical, and oxidative stress are studied, and the blood biochemical stress level, antioxidant enzyme activities, and immune indexes of the spotted seabass are measured to provide a theoretical basis for the anesthetic treatment of the sea fish. As compared with the expensive MS-222 and linalool, the price of Antrodia cinnamomea essential oil is 1 / 10 thereof, which can effectively reduce the cost of anesthesia, is particularly suitable for vaccination, blood collection, weighing, and transportation of live fish, etc., and has a higher economic benefit.SELECTED DRAWING: Figure 2

The present invention relates to the technical field of aquatic biological monitoring, and discloses an offshore monitoring station applicable to an offshore seawater fish farm, which includes a rotating and lifting monitoring mechanism for monitoring aquatic organisms, and further includes: a classified trapping mechanism for cooperating with the rotating and lifting monitoring mechanism to trap aquatic organisms; a traction mechanism for adjusting the position of the classified trapping mechanism, the traction mechanism includes a floating rail, and a sliding seat arranged on the outer surface of the floating rail, and the sliding seat is slidably arranged on the floating rail through rollers. By providing the rotating and lifting monitoring mechanism, the rotatable and liftable camera can be used to monitor the invasive aquatic organisms in the marine ranch in real time, so as to directly observe the condition of the aquatic organisms, and the monitoring range is large and the efficiency is high. In addition, with the cooperation of the provided classified trapping mechanism, trapping measures can be taken immediately when abnormal conditions are found.

The present application belongs to the technical field of compound feed for marine fish, and particularly relates to a feed for improving the antioxidant enzyme activity of juvenile Hexagrammos otakii and a preparation method thereof. The feed for improving the antioxidant enzyme activity of juvenile Hexagrammos otakii is prepared from the following raw materials in mass percentage: 95% to 96.5% of basic ingredients, 1% of compound vitamins, 1% of compound mineral salts, and 1.5% to 3% of an antioxidant enzyme activity composition, and the sum of the mass percentages of the raw materials is 100%; the antioxidant enzyme activity composition is composed of vitamin C and beta-carotene, and the mass ratio of vitamin C to beta-carotene is 1 to 3: 1 to 3. The feed for improving the antioxidant enzyme activity of juvenile Hexagrammos otakii obtained by the present application not only can provide sufficient natural antioxidant components to enhance the antioxidant defense mechanism of the juvenile fish, but also can effectively solve the problems of slow growth, low feed utilization rate, and water pollution of juvenile Hexagrammos otakii caused by insufficient antioxidant activity.

The utility model relates to fish product processing technical field especially, it is a kind of sea fish product frying feeding device, it is thawed and is conveyed to frozen fish product by operation platform and first conveying device cooperation, fish product surface is dried by drying device, fish product after drying is conveyed by second conveying device, fish product surface is wrapped powder operation by powder supply device, and fish product surface excess flour is vibrated and removed by vibration device;Including operation platform;Still including first conveying device, drying device, second conveying device, powder supply device and vibration device, first conveying device, drying device, second conveying device, powder supply device and vibration device are all installed on operation platform;First conveying device and second conveying device are conveyed, drying device is dried, powder supply device is surface powder spraying, and vibration device is vibrated.

The invention discloses a growth-promoting and high-food-calling premixed feed for marine fishes, and belongs to the technical field of marine fish culture. The invention provides a marine fish premix capable of promoting growth and strongly attracting food. A marine fish feed is also prepared based on the premix for promoting growth and strongly attracting the marine fish, and the proportion of animal-derived raw materials such as fish meal, shrimp meal and the like in the feed is low and is only 22.2-36.5%. According to the present invention, by adding the growth promoting and strong food calling marine fish premix, the prepared marine fish feed can significantly stimulate the ingestion desire of the marine fish, improve the food consumption and promote the growth of the marine fish on the basis of reducing the addition amount of the animal-derived raw materials and relieving the defects caused by the animal-derived raw materials.

The invention relates to a preparation method of a complete puffed compound feed for trachinotus ovatus. Belongs to the technical field of expanded feed for marine fish. The pregelatinized starch is used for lowering the temperature of the puffing and tempering section, and the water vapor is used for adjusting the initial water content to 19-23%, so that the high-temperature inactivation is reduced; the passing time of the screw section is controlled, and mechanical shearing and heat accumulation are reduced; the instant high-temperature pressure of the puffing section is suddenly reduced to form a porous structure, and the dissolution rate control of crude protein and crude fat is promoted by matching with the proper proportion of the pre-gelatinized corn starch and the cassava starch and the tackifying effect of the poultry eggs; probiotics and metabolites thereof in the fermentation liquor are reserved to the maximum extent; the viable count of probiotics in the puffed granules is remarkably increased and is far higher than that of conventional high-temperature granulation; butyric acid, lactic acid, antibacterial peptide and the like generated by fermentation are blended into the feed, so that growth of pathogenic bacteria is inhibited, and intestinal health of the trachinotus ovatus is enhanced.

The application discloses a large-specification seawater fry factory grading cultivation system and relates to the technical field of aquaculture. The system comprises a first-stage, a second-stage and a third-stage cultivation pool. The first-stage cultivation pool is connected with the second-stage cultivation pool through a conveying pipeline, and the second-stage cultivation pool is arranged in the third-stage pool. The first-stage pool is provided with an independent first circulating water filtration device and a monitoring unit, and the second-stage and third-stage pools share a second set of circulating water filtration and monitoring units. The monitoring units at all stages are integrated with growth detection, environmental regulation and disease early warning functions. The first-stage pool is used for cultivating newly hatched fry, and when the fry develops to the juvenile stage, the fry is automatically transferred to the second-stage pool through the conveying pipeline; the second-stage pool and the third-stage pool jointly form a mixed culture environment, and when the juvenile fish reaches the target specification, the cage door is opened to transfer the juvenile fish into the third-stage pool. Through the grading environmental control and the automatic transfer mechanism, the system realizes efficient cultivation of fry from fry to large-specification fry, and solves the problems of uneven growth and low sorting efficiency in traditional fry cultivation.

The invention discloses a seawater roe intelligent light-operated incubation cabin, and belongs to the technical field of fish incubation, the incubation cabin comprises an incubation pool, one side of the incubation pool is provided with a first water pump, the first water pump is provided with a water pipe arranged in the incubation pool, the bottom in the incubation pool is provided with a light-operated assembly, and the light-operated assembly comprises a first light-transmitting plate and a second light-transmitting plate which are vertically arranged at an interval; the first light-transmitting plate and the second light-transmitting plate are connected through a supporting frame, and an adjustable spectrum lamp is arranged above the second light-transmitting plate. The incubation bin has the functions of integrating precise light control, efficient water flow regulation and control, impurity treatment and stable water quality filtering, and the problems that according to traditional incubation equipment, the illumination spectrum is single and cannot be dynamically adjusted, and local high temperature is caused due to uneven water flow circulation are solved.

Aquaculture system with a tank (1) for raising aquatic organisms, in particular fish (2), preferably saltwater fish, wherein the tank (1) is divided into at least two, preferably three, separate tank sections (4), wherein the aquatic organisms in the tank sections (4) are kept separately in groups according to different life stages, wherein the aquatic organisms of the individual groups are in the same life stage, wherein each tank section (4) is assigned a feeding device (5), wherein the quantity of feed to be added to each feeding device (5) is individually adjustable, wherein the quantity of feed is adjusted depending on a feed conversion ratio (FCR) of the aquatic organisms; wherein the tank (1) comprises at least one device for aeration with ambient air, preferably a side channel blower;wherein the ambient air is introduced into at least one basin section (4) via at least one air nozzle (9), wherein the at least one air nozzle (9) is arranged in the at least one basin section (4) such that a turbulent circular flow is created in the basin section (4), and wherein the circular flow inhibits sedimentation of particulate substances in the basin section (4).

This application discloses a safety protection structure for transporting marine fish, relating to the field of seafood transport technology. It includes a belt, a support frame, two drive rollers, and a drive motor. The support frame supports the two drive rollers, which are rotatably connected to the support frame. The belt passes around the two drive rollers sequentially. The drive motor drives the drive rollers to rotate. The belt surface is provided with several magnetic strips, which are sleeved on the outside of the belt and arranged parallel to the belt width. The drive roller at the belt output end is a magnetic roller. A support plate is fixed inside the support frame, located between the two drive rollers and inside the belt. A permanent magnet is fixed to the lower end of the support plate near the magnetic roller, and an electromagnet is fixed to the side of the permanent magnet away from the drive roller. A collection component is provided at the lower end of the support frame for collecting metallic impurities. This application improves the ease of separating marine fish from impurities.

The invention provides a precisely-regulated method for increasing the spawning induction survival rate of parent fish of Pseudosciaena crocea of the sal family, and belongs to the technical field of marine fish breeding. The accurately regulated and controlled method for increasing the spawning induction survival rate of the parent fish of the Pseudosciaena crocea of the sal family comprises the following steps: S1, in a prenatal breeding regulation and control stage, matching bait nutrition and regulating and controlling a breeding environment; s2, in an environment transition stage, gradient environment adaptation is carried out, and a cultivation pond, a transition pond, an induced spawning pond and a three-stage transition system are built; transferring in batches: firstly transferring the parent fish from the breeding pond to a transition pond; s3, in the precise spawning induction stage, the parent fishes are grouped; s4, in a postpartum nursing stage, after spawning is finished, the parent fishes are separated immediately and transferred to a nursing pool. The breeding environment is regulated and controlled by stages, a hormone scheme is customized, and postpartum care and targeted nutrient enrichment are refined; physical damage and postpartum infection in the spawning induction process are reduced; the postpartum recovery speed and the reutilization capability of the parent fish are improved, and the induced spawning survival rate is improved.