72 results about "Saltwater fish" patented technology

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 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 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 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.

The invention relates to the technical field of aquaculture, in particular to a water quality control method for medium-term cultivation of scatophagus argus fry. The method comprises the steps that water is not changed in the daytime in the middle-stage cultivation period of scatophagus argus fry, baking soda is splashed in a middle-stage cultivation pond of scatophagus argus fry in the morning and afternoon till the final concentration is 1-3 ppm, it is guaranteed that the pH value of a water body is stabilized between 8.5-9.0, the abundance of algae is controlled between 107 cells / L and 104 cells / L, and at night in the middle-stage cultivation period of marine fish fry, water is sprayed to the culture pond in the middle-stage cultivation period of scatophagus argus fry. Water is drained and then added into the scatophagus argus fry medium-term cultivation pond, the water adding amount is the same as the water drainage amount, and the water adding amount accounts for 20-30% of the total volume of the scatophagus argus fry medium-term cultivation pond; the water quality condition of the scatophagus argus fry culture pond can be well controlled, and the method plays an important role in promoting artificial breeding of scatophagus argus to achieve high and stable yield.

The present application belongs to the technical field of seawater fish breeding and breeding, and particularly relates to a method for evaluating temperature acute stress of flatfish and application. The flatfish is put into a breeding area, an experimental water flow velocity is set, the water body is gradually warmed or cooled, when the flatfish cannot lie flat on the water bottom and is carried into a detection position by the water flow, the temperature or time corresponding to the moment is recorded, that is, the tolerance temperature or tolerance time of the flatfish; wherein the detection position is close to the water outflow direction side of the breeding area. The evaluation method of the present application can determine whether the fish can lie flat on the water bottom through the water flow, and takes being carried to the detection position as the standard, which can avoid the stress reaction of the fish caused by artificial stirring, and is more objective and accurate.

This invention discloses a method for constructing and applying a marine fish muscle stem cell line. The culture medium uses basal medium as the background medium and contains LIF growth factor, EGF growth factor, and FGF2 protein derived from the leopard-gill sea bass. The final concentration of FGF2 protein from the leopard-gill sea bass is 20-30 ng / mL, 30-45 ng / mL, 45-55 ng / mL, or 55-70 ng / mL. Passaging using this medium can construct a stable, rapidly dividing, and short-passaging immortalized marine fish muscle stem cell line, capable of stable passage for more than 50 generations. This provides raw materials for exploring the function and gene regulation mechanisms of myoblasts, and provides in vitro verification experimental conditions for further research on the effects of marine fish muscle stem cells on growth rate, laying the foundation for the breeding of superior marine fish species.

The invention discloses a seawater fry grading, counting and sorting machine, and belongs to the technical field of fry sorting. The sorting machine comprises a sorting assembly, the sorting assembly comprises a sorting box body, one end of the sorting box body is an inlet and is provided with a counting assembly with a counter, and the other end of the sorting box body is an outlet and is provided with a grading flow channel; guide vertical plates are arranged on the two sides of an inlet of the sorting box correspondingly, the distance between the two guide vertical plates in the outlet direction allows a single organism to pass through, and the outlet sections of the guide vertical plates are connected with movable flow channels capable of swinging. According to the sorting machine, full-process automation of the seawater fry from temporary rearing, counting to grading and sorting is achieved, the grading precision and efficiency are improved, and the fry damage rate is reduced.

This invention belongs to the field of formulated feed technology for marine fish, specifically relating to a feed for improving the muscle quality of *Hexagrammos oysterfish* and its preparation method. The feed for improving the muscle quality of *Hexagrammos oysterfish* is made from the following raw materials in the indicated weight percentages: 93.5%–96.5% basic ingredients, 1% compound vitamins, 1% compound mineral salts, and 1.5%–4.5% formulated feed composition, with the sum of the weight percentages of all raw materials being 100%. The formulated feed composition consists of yeast β-glucan, chitosan oligosaccharide, and coated sodium butyrate, with the mass ratio of yeast β-glucan, chitosan oligosaccharide, and coated sodium butyrate being 1–3:1–3:1–2. This invention not only effectively reduces fat deposition in the body of *Hexagrammos oysterfish*, improving its muscle elasticity and chewiness, but also significantly improves the textural properties of the fish meat, thereby enhancing the overall muscle quality of *Hexagrammos oysterfish* and meeting consumer preferences.

The utility model discloses a kind of vacuum density meters for aquatic feed, it is related to aquatic extruded material production equipment technical field, including placing base. The upper surface of the placing base is equipped with extruded cylinder, and the end of extruded cylinder is equipped with servo motor one, and servo motor one output screw rod rotates. The vacuum density meter for aquatic feed, compared with the existing ordinary aquatic extruded material density control instrument, cutting tool and pressure chamber are designed as a whole by connecting cylinder, reduce intermediate connecting component, optimize internal structure by finite element analysis, select high-strength, corrosion-resistant alloy material, ensure stability and sealing under high-pressure environment, to produce % sink water material, ensure that equipment can be in seawater fish material and crayfish material production environment Long-term stable operation;Adopt high-precision laser cutting and numerical control bending technology to improve part accuracy and assembly stability, improve equipment surface protection ability through high-quality painting treatment, adapt to humid and strong corrosion environment.

The invention discloses an automatic microparticle feed feeding device capable of improving the survival rate of marine fries, and belongs to the technical field of marine aquaculture engineering.The device comprises a feeding box, a driving motor is arranged at the upper end of the feeding box, a stirring assembly connected with the driving motor is arranged in the feeding box, and the stirring assembly comprises a rotating shaft connected with an output shaft of the driving motor; the rotating shaft is sequentially sleeved with connecting sleeves at intervals, at least two stirring blades parallel to the axis of the rotating shaft are arranged on the outer side of the rotating shaft, the outer sides of the connecting sleeves are connected with the stirring blades through connecting battens, and spiral blades surround the outer side of the bottom of the rotating shaft. Feed can be uniformly dispersed, caking and deterioration are effectively prevented, and the feeding height can be adjusted according to the water level change.

This utility model discloses a device for measuring the growth indicators of marine fish, specifically a base plate, and further includes: two sets of weighing components for measuring the weight of marine fish; an adjusting component for adjusting the distance between the two sets of weighing components, and the adjusting component is located on the top of the base plate; and a fixing component for fixing the marine fish, and the fixing component is located on the weighing components. The adjusting component includes side plates, which are fixedly installed on both sides of the top of the base plate. A screw is rotatably connected between the two sets of side plates via bearings, and the thread directions at both ends of the screw are opposite from the middle. Both ends of the screw are threadedly connected to sliders. This utility model, by setting a fixing component on the weighing components, enables the fixing of marine fish during the measurement of their growth indicators, thereby improving the accuracy of weighing the marine fish.

The invention discloses a marine fish bait and a preparation process thereof, and relates to the technical field of breeding feeds, the marine fish bait comprises the following components in parts by weight: 73.2-82.8 parts of a protein component, 10.8-13.2 parts of an energy component, 4.5-5.6 parts of a strengthening component, 2.5-3.5 parts of a functional additive and a compound bacteria solution accounting for 33.5-40% of the total mass; wherein the protein component is prepared from 28 to 32 parts of brown fishmeal, 40 to 43 parts of modified compound protein, 4 to 6 parts of soybean protein concentrate and 1.2 to 1.8 parts of compound enzymolysis fish soluble pulp; the modified compound protein is amphiphilic compound modified protein grafted with a hydrophilic monomer and a hydrophobic monomer. Through combination of the amphiphilic compound modified protein enhanced components and synergistic effect of the specific components, the effects of mildly dissolving the bait in seawater, improving the nutrient utilization rate and digestibility, reducing fish meal dependence and culture cost and assisting fish growth are achieved.