A recirculating water shellfish larviculture / aquaculture system

Abstract

This invention discloses a recirculating aquaculture system for shellfish seedlings, comprising a continuous algae cultivation system, a cultivation tank, and a recirculating water treatment system. The continuous algae cultivation system includes a photobioreactor, the main body of which supplies algae solution to the cultivation tank via conduits. The cultivation tank is connected to the recirculating water treatment system via an exhaust pipe and an inlet pipe. This recirculating aquaculture system for shellfish seedlings enables continuous cultivation of feed (microalgae). Algae solution is automatically added to the cultivation tank according to the shellfish's growth stage and the algae cell density. The culture water is circulated through the recirculating water treatment system, achieving factory-scale cultivation of shellfish seedlings, reducing cultivation processes, and minimizing human intervention.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of shellfish fry circulating water breeding / cultivation system. BACKGROUND

[0002] Current shellfish seed rearing mainly adopts outdoor rearing and indoor cement pool rearing, outdoor rearing is affected by changes in water quality environment and climate, etc., seed cultivation production is unstable, indoor cement pool rearing mostly uses water change cultivation, and there is little circulating water, and the discharge of sewage can easily cause environmental pollution. The Chinese invention patent with publication number CN112741042B discloses a kind of sea water pond circulating water aquaculture system based on tidal flat shellfish, its essence is to improve economic benefit by mixed culture of multiple different organisms. Compared with the above-mentioned circulating water aquaculture system, the shellfish breeding system has certain particularity, the larva of shellfish is small, and micro-flow water is generally used, and the general circulating water aquaculture pond cannot be directly used for the breeding of shellfish fry. In addition, the demand for feed unicellular algae is greatly increased during the juvenile shellfish period, and the traditional method is to culture and supply through a three-stage algal system, which needs to be transferred multiple times during the period, the process is complex, and more manual intervention is required, and pollution is easy to cause, and the culture efficiency is not high. SUMMARY

[0003] In view of the above shortcomings, the purpose of the present application is to provide a breeding and cultivation system integrating feed cultivation and shellfish fry feeding breeding.

[0004] To this end, a kind of shellfish fry circulating water breeding / cultivation system of the present application, including algal continuous culture system, cultivation pond and circulating water treatment system, the algal continuous culture system includes photobioreactor, reactor main body supplies algal liquid to cultivation pond through conduit, the cultivation pond is connected with circulating water treatment system through tail water pipe and water inlet pipe.

[0005] Further, it also includes a measurement system, which monitors the production stage of algae in the photobioreactor, the algal cell density and the algal cell density in the cultivation pond, the reactor main body includes a liquid outlet, the liquid outlet is connected with the conduit, the conduit is connected with the automatic feeding device, and the control module controls the automatic feeding device to adjust the amount of algal liquid input into the cultivation pond according to the monitoring data of the measurement system.

[0006] Further, the reactor main body includes an auxiliary pipeline and a control valve, the auxiliary pipeline is connected with the liquid inlet pipeline in parallel, the two ends of the auxiliary pipeline are connected on the liquid inlet pipe, the auxiliary pipeline includes a backflush pipe, the diameter of the backflush pipe is equal to that of the reactor main pipe, the backflush pipe includes an inlet, the inlet is suitable for placing a cleaning sponge, and the control valve controls the liquid inlet pipe to be closed and the auxiliary pipeline to be opened in such a way that the water drives the cleaning sponge to move in the reactor main pipe.

[0007] Further, the algal culture system further comprises a seawater electrolysis disinfection system and a growth environment adjusting system, the measuring system comprises a chlorophyll fluorescence online measuring device, and the growth environment adjusting system comprises a full-automatic temperature control system, a full-automatic O2 / CO2 supply system, a light intensity control module, a full-automatic nutrient adding system, a gas-liquid circulation system and a PH control module.

[0008] Further, the culture pool comprises a bottom drainage device connected with a water level maintainer via a pipeline, the water level maintainer is connected with a tail water pipe, and the bottom drainage device and the water level maintainer are communicated with a water collecting well connected with a main drainage pipe.

[0009] Further, the culture pool comprises a heat exchange coil and an oxygen increasing facility, the measuring system monitors the algal cell density in the culture pool, and the control module controls the automatic feeding device to feed, so that the microalgal cell density in the culture pool is maintained at 5-8*104 cell / mL.

[0010] Further, the automatic feeding device comprises a spray head, the automatic feeding device comprises a rotating assembly and a spray head angle adjusting assembly, the angle of the angle adjusting assembly is adjusted so that the algal liquid is fed to the water surface at different distances from the spray head, and the rotating assembly is rotated to uniformly feed the algal liquid to the water surface of the culture pool.

[0011] Further, a rotating adjusting assembly is further included, the rotating assembly forms a circular feeding area on the water surface after one rotation, and the rotating adjusting assembly is used for adjusting the rotating angular velocity of the rotating assembly, so that the linear velocity of the circular feeding area formed by the spray head at different angles is equal.

[0012] Further, the rotating assembly comprises a rotating table, a transmission device and a servo motor, the servo motor drives the transmission device, the transmission device drives the rotating table to rotate, the spray head angle adjusting assembly comprises a first gear, the spray head is fixed on the first gear and the elevation angle of the spray head is adjusted by the rotation of the first gear.

[0013] Further, a second gear is further included, the first gear and the second gear are engaged, the second gear is driven by the servo motor, the first gear is a sector gear, a connecting rod is movably connected to the first gear, the other end of the connecting rod is movably connected to the piston rod of a cylinder, the piston rod is connected with an electronic ruler, the electronic ruler collects the movement data of the piston rod and feeds back to the servo motor control module of the rotating assembly, and the control module controls the rotating speed of the servo motor of the rotating assembly.

[0014] The beneficial technical effects of the present application are as follows:

[0015] (1) The present application comprises a seawater electrolysis disinfection device, which can directly generate hypochlorite ions by seawater electrolysis to disinfect seawater, and the disinfected seawater is input into a photobioreactor to culture single-cell algae at a high density in a continuous manner. Through continuous culture, a stable harvest amount is maintained, and the algae liquid is supplied to the cultivation pool through the conduit of the liquid outlet. The electromagnetic valve and peristaltic pump of the liquid outlet are controlled by the control module, and the input amount of the algae liquid is adjusted according to the production stage of the algae in the photobioreactor, the density of the algae cells, and the density of the algae cells in the cultivation pool and the growth stage demand of the shellfish.

[0016] (2) In a specific embodiment of the present application, the photobioreactor further comprises a growth environment adjustment system. The production stage of the algae cells, the density of the algae cells, and the parameters of the culture solution are monitored by an online measurement system, and the control module automatically controls the growth environment adjustment system to adjust the illumination, temperature, and elements of the photobioreactor, so as to realize high-density stable production of the algae and continuous stable harvesting of the algae.

[0017] (3) In a specific embodiment of the present application, an auxiliary pipe is further provided. The auxiliary pipe comprises a backflush pipe, and a cleaning sponge is inserted into the backflush pipe to move along the inside of the photobioreactor under the pumping of the water flow to clean the inside.

[0018] (4) In a specific embodiment of the present application, an automatic feeding device is further provided. The spray head of the automatic feeding device is realized by rotating the assembly to feed on the water surface. The distance of feeding is adjusted by adjusting the elevation angle and pressure of the spray head, and the rotation speed of the rotating assembly is adjusted by the rotating adjustment device to make the algae liquid uniformly distributed. That is, when feeding the area far away from the spray head, the rotation angular speed of the rotating assembly is slower. The reason is that the longer the distance, the longer the circumference formed by the feeding range of the rotating assembly in one rotation, and the feeding amount of the spray head per unit time is constant. Therefore, the rotation speed is reduced to output more algae liquid when feeding at a farther distance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic diagram of the feeding workshop and its pipeline arrangement is provided to realize the present application.

[0020] Figure 2 A top view schematic diagram of the photobioreactor is provided.

[0021] Figure 3 A Figure 2 Left view;

[0022] Figure 4 A schematic diagram of the liquid inlet pipe and auxiliary pipe of the photobioreactor is provided.

[0023] Figure 5 A schematic diagram of the cultivation pool is provided.

[0024] Figure 6 A schematic diagram of the rotating assembly is provided.

[0025] Figure 7 schematic view of the spray head angle adjustment assembly and the rotation adjustment assembly.

[0026] Reference signs: 1, cultivation workshop; 2, cultivation pool; 201, bottom drainage device; 3, circulating water treatment pool; 4, algal room; 5, photobioreactor; 6, water inlet pipe; 7, tail water pipe; 8, water collecting well; 9, main drainage pipe; 10, water level maintainer; 11, liquid inlet pipe; 12, control valve; 13, online measuring device; 14, auxiliary pipeline; 15, backflushing pipe; 16, air inlet hole; 17, liquid outlet; 18, conduit; 19, seawater electrolytic disinfection system; 20, centrifugal pump; 21, automatic feeding device; 211, rotating table; 212, belt drive; 213, servo motor; 214, spray head; 215, first gear; 216, second gear; 217, connecting rod; 218, air cylinder; 219, electronic ruler. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0028] Figures 1 to 4 a specific embodiment of the shell fry circulating water breeding / cultivation system of the present application is shown, Figure 1The beach clam breeding / nursery workshop of the embodiment is shown, which is internally provided with an algae continuous culture system, a culture pond 2, a measuring system and a circulating water treatment system. The algae continuous culture system includes a photobioreactor 5. The reactor main body supplies algae liquid to the culture pond 2 through a conduit 18. Single-cell algae is continuously cultured. The culture pond 2 is stably supplied with algae liquid every day. The culture pond 2 is connected with the circulating water treatment system through a tail water pipe 7 and a water inlet pipe 6. The photobioreactor 5 is provided with an online measuring device 13 and a sampling port for manual sampling for monitoring. The culture pond 2 is provided with an online water quality monitoring instrument and a sampling port for manual sampling for monitoring. The production stage of algae in the photobioreactor 5, the algae cell density and the algae cell density in the culture pond 2 are determined by measurement. The stable collection amount data of the algae liquid of the photobioreactor 5 is calculated according to the production stage of algae in the photobioreactor 5 and the algae cell density. The input amount of the algae liquid is calculated according to the algae cell density in the culture pond 2 and the growth stage of the clams. The intelligent control module controls the electromagnetic valve and the peristaltic pump to output corresponding amounts of algae liquid to the corresponding culture pond 2. In the embodiment, the beach clam breeding / nursery workshop is provided with 16 sets of photobioreactors 5 and dozens of culture ponds 2. The bait of the culture pond 2 is provided by the algae continuously cultured by the 16 sets of photobioreactors 5. The main body of the photobioreactor 5 includes a double-helix organic glass tube, a PVC gas collection barrel, a centrifugal pump 20 and a fixed support and the like. The photobioreactor 5 further includes an air inlet hole 16 and a gas permeation valve and a gas permeation hole arranged at the upper end of the photobioreactor 5, so as to realize gas-liquid circulation. The photobioreactor 5 is provided with a sampling port and an online measuring device 13, so as to realize sampling monitoring or online monitoring. The photobioreactor 5 is further provided with a liquid outlet 17 and a conduit 18, so as to supply algae liquid to the culture pond 2. The pipeline of the culture pond 2 is shown in Figure 1 As shown, the culture pond 2 adopts a polygonal structure or a circular structure. The culture pond 2 is provided with a bottom drainage device 201 connected with a water level maintainer 10. The water level maintainer 10 is connected with the tail water pipe 7. The bottom drainage device 201 and the water level maintainer 10 are communicated with a water collecting well 8. The water collecting well 8 is connected with a main drainage pipe 9. The water level maintainer 10 is a prior art, mainly including a hollow circular tube and an overflow hole on the hollow circular tube. When the water level is higher than the overflow hole, the water flows from the overflow hole to the tail water pipe 7. The water collecting well 8 and the main drainage pipe 9 are mainly used for discharging water after the water in the culture pond is circulated for a certain number of times. It should be noted that, since the clam seedlings are tiny, the culture pond 2 adopts micro-flow water. The water flow of the tail water pipe 7 flows to the circulating water treatment pond 3. The circulating water treatment system is also a prior art, including solid-liquid separation through a microfilter, lifting to a gas floatation pond through a submersible pump, then flowing to a first moving bed biological filter and a second moving bed biological filter by itself, and finally flowing back to the culture pond 2 through the water inlet pipe 6 through an ultraviolet sterilization device. The culture pond 2 further includes a water inlet main pipe (not shown in the figure) for supplementing water to the culture pond 2 from the outside. The water inlet main pipe can be communicated with the water inlet pipe 6 of the circulating water treatment system for supplying water to the culture pond 2.

[0029] Referring toFigure 2 , Figure 3 and Figure 4 As shown, the continuous algae culture system mainly achieves high-density continuous cultivation of single-celled algae, maintaining a stable daily harvest. Taking the cultivation of *Isochrysis galbana* as an example, a continuous culture medium is prepared. During the continuous cultivation process, the nitrate concentration is continuously monitored by manual sampling or online measurement device 13. When the concentration is below 60 μmol / L, nitrate ions are mainly determined by ultraviolet spectrophotometry. Nitrate ions have strong absorption in the 220 nm ultraviolet region, and the relationship between absorbance and its concentration follows Lambert-Beer's law. The intelligent control module controls the fully automatic nutrient addition system to replenish the nutrient solution (e.g., using solenoid valves and pumps to add the corresponding nutrient solution, trace elements, etc. to the gas collection tank or photobioreactor 5 pipeline). During the cultivation of *Isochrysis galbana*, air is continuously supplied, and the air is mainly pre-treated by an air purifier. CO2 is supplied to the cultivation system intermittently. During the cultivation process, the photoperiod is maintained at 12L:12D. In a 2000L photobioreactor 5, the total volume of *Isochrysis galbana* cultured was 1600L. Continuous culture for 40 days was conducted. When the *Isochrysis galbana* density was 640–680 × 10⁴ cells / ml, a daily harvest of 200–300L maintained a stable yield. When the algal cell count reached 660 × 10⁴ cells / ml, a daily harvest of 200L resulted in a daily growth of 187 × 10⁴ cells / ml; a daily harvest of 300L yielded a daily growth of 159 × 10⁴ cells / ml, both indicating high growth rates. A daily discharge of 400L was maintained when the algal concentration was 560 × 10⁴ cells / ml, and 600L was maintained when the concentration was 480 × 10⁴ cells / ml, both maintaining stable growth. These harvest experiments at different cell densities demonstrate that harvesting *Isochrysis galbana* during its growth period and adding sterilized seawater and nutrient solution can maintain a stable state.

[0030] In the above embodiments, reference is made to Figure 4 As shown, the reactor body also includes an auxiliary pipe 14 and a control valve 12. The auxiliary pipe 14 is connected in parallel with the inlet pipe 11. Both ends of the auxiliary pipe 14 are connected to the inlet pipe 11. The auxiliary pipe 14 includes a backflush pipe 15. An air inlet 16 is provided on the auxiliary pipe 14 to connect to the air and CO2 supply system / device. The diameter of the backflush pipe 15 is equal to that of the reactor main pipe. The backflush pipe 15 includes an inlet with a cover. The inlet is suitable for inserting a cleaning sponge. The control valve 12 controls the inlet pipe 11 to close and the control valve 12 of the auxiliary pipe 14 to open, so that water enters the auxiliary pipe 14 and drives the cleaning sponge from the backflush pipe 15 into the reactor main pipe, where it moves in the main pipe for cleaning.

[0031] In the above embodiment, the algae culture system further comprises a seawater electrolysis disinfection system 19 and a growth environment adjustment system comprising a full-automatic temperature control system, a full-automatic O2 / CO2 supply system, a light intensity control module, a full-automatic nutrient addition system, a gas-liquid circulation system and a PH control module. This embodiment constructs two sets of intelligent seawater electrolysis disinfection systems 19 in a shellfish seed breeding workshop, and carries out an experiment on the influence of electrolytically oxidized water (EOW) technology on the growth and reproduction of Isochrysis galbana Parke 8701, Tetraselmis helgolandica and Chaetoceros muelleri. The experiment sets up two experimental groups of electrolytically oxidized sand-filtered seawater EOW100 (ACC100 mg / L) and bleaching powder disinfected sand-filtered seawater (ACC35 mg / L), and uses boiled sand-filtered seawater as a control group to culture the three kinds of microalgae for 10 days. The results show that, under the condition of 680 nm wavelength, the cell density of the three kinds of microalgae has a good linear relationship with the optical density (OD) value. The electrolytically oxidized seawater is suitable for the growth of the three kinds of marine microalgae. The electrolytically oxidized seawater group (ACC100 mg / L) for culturing Isochrysis galbana Parke 8701 obtains the highest cell density of 43.77×105 cells / mL on the 10th day of culture, which is significantly higher than that of the control group (P>0.05). There is no significant difference in the final algal cell density between the treatment groups for culturing Tetraselmis helgolandica and Chaetoceros muelleri (P>0.05). In summary, the electrolytically oxidized seawater (ACC100 mg / L) is suitable for the culture of high-quality bait microalgae such as Isochrysis galbana Parke 8701, Tetraselmis helgolandica and Chaetoceros muelleri for shellfish.

[0032] A TEC temperature control device is arranged below the reactor bottom cover. The parameters collected by the temperature sensor at the upper end of the reactor are sent to the controller, and the controller controls the heating or cooling of the TEC to adjust the temperature of the reactor.

[0033] The light source of the reactor light system is an LED integrated light source arranged outside the reactor. The LED light bar is arranged in a spiral array outside the photobioreactor 5. The external LED can avoid the influence of low light energy utilization rate of algal cells in the reactor caused by the adhesion of algae to the wall of the lamp tube due to the wall growth. The LED light bar is mainly composed of white light source LEDs, and the power supply voltage of the light bar is 24V. The LED light bar needs a driving circuit to drive and receive different duty cycle PWM output by the single-chip microcomputer to realize different light-dark ratios and different light intensities to meet the needs of light intensity in the algae culture process. The light intensity sensor mainly uses hot spot effect for light intensity detection.

[0034] The pH control system is composed of a pH meter, a pH electrode and an acid-base liquid peristaltic pump. The pH electrode can accurately measure the pH value of the algae liquid in real time. The meter displays the pH value of the algae liquid in real time and can set the expected pH value. When the pH value of the nutrient liquid is higher than the set value, the acid-base peristaltic pump is started and the citric acid reagent is added drop by drop to reduce the acidity of the algae liquid; on the contrary, when the initial pH value of the nutrient liquid is lower than the set value, the acid-base peristaltic pump is started and the sodium hydroxide reagent is added drop by drop to increase the acidity of the nutrient liquid until the pH value is stable.

[0035] The measurement system of the photobioreactor 5 includes a photosynthetic activity measuring instrument. When the living planktonic algae is irradiated by light, the chlorophyll, light harvesting complexes (LHC) and antennae system in the algae cells are excited by the absorbed photon energy. These energies are mainly consumed through three ways: (1) converted into chemical energy and stored by the algae cells under photosynthesis; (2) dissipated outward as heat; and (3) dissipated outward as fluorescence. The total amount of energy consumed through the three ways is the same, and the change of each form of energy will cause the change of the other two, i.e. photochemical quenching and heat dissipate will cause fluorescence quenching and thus change the value of chlorophyll fluorescence. Compared with the other two energies, the chlorophyll fluorescence measurement method is relatively simple. Through the chlorophyll fluorescence quantum yield, the proportion information of photochemical quenching and heat dissipate can be obtained, so the chlorophyll fluorescence probe can well reflect the growth state information of the algae.

[0036] In the above embodiment, the cultivation pond 2 includes a heat exchange coil and an oxygenation facility (not shown in the figure), and the constant temperature and oxygenation facility of the cultivation pond 2 are both prior art. The measurement system includes online monitoring equipment and a sampling port for manual sampling monitoring. The online monitoring equipment includes online monitoring of water quality physicochemical factors, and the main online monitoring means adopted is fixed-point water quality monitoring. The online monitoring equipment carried includes EXO2 and YSI 6600V2 multi-parameter instruments of YSI company, and the monitoring elements include water temperature, conductivity, dissolved oxygen, pH, turbidity, chlorophyll a, etc. Other nutrient salts and other parameters are monitored manually. The change of the algae cell density in the cultivation pond is monitored by using spectrophotometry, and the growth stage and algae cell density of the target algae species in the photobioreactor 5 are distinguished, and the growth period and quantity of the beach clam seedlings in the clam seed cultivation pond are distinguished. According to the demand of the clam seed, the input amount of the algae liquid is adjusted in time, and the algae is accurately fed to each cultivation pond through the automatic feeding device 21 connected with the conduit 18 every 4-8 hours, so as to maintain the microalgae cell density of 5-8×104 cell / mL to meet the nutritional ingredients required by the growth of the clams.

[0037] Since the shellfish seed individuals in the cultivation tank 2 are tiny (similar in size to dust), the shellfish seed individuals have limited activity in the cultivation tank 2, and the cultivation tank 2 uses micro-flow water, so the algae liquid is difficult to be uniformly distributed by the water flow of the cultivation water, and the cultivation tank 2 needs to be uniformly fed. Referring to Figure 5 、 Figure 6 and Figure 7 , in the present embodiment, the automatic feeding device 21 includes a spray head 214 connected with the conduit 18, and further includes a rotating assembly and a spray head angle adjusting assembly. The rotating assembly includes a rotating table 211, a transmission device, and a servo motor 213. The transmission device can be a belt transmission device 212, a gear transmission device, etc. The servo motor 213 drives the transmission device, and the transmission device drives the rotating table 211 to rotate, and the rotating table 211 drives the spray head 214 to rotate. The spray head angle adjusting assembly includes a first gear 215. The spray head 214 is fixed on the first gear 215, and the first gear 215 rotates to adjust the elevation angle of the spray head 214. The spray head angle adjusting assembly can further include a second gear 216. The first gear 215 and the second gear 216 are engaged, and the second gear 216 is driven by a servo motor. The first gear 215 is a sector gear. In the case that the pumping pressure is constant and the elevation angle of the spray head 214 is constant, one rotation of the rotating table 211 drives the spray head 214 to form a circular ring-shaped feeding range on the water surface at a predetermined distance. The angular velocity of rotation determines the amount of algae liquid fed (the slower the rotation speed, the more the amount of algae liquid fed). In the present embodiment, the elevation angle of the spray head 214 is adjusted after one or several rotations of the spray head 214, the distance of feeding is changed, a new circular ring-shaped feeding range is formed after one or several rotations, and the algae liquid is uniformly distributed on the water surface of the cultivation tank 2 through the rotation and elevation angle change of the spray head 214. The problem is that when the elevation angle of the spray head 214 is different, the diameter of the circular ring-shaped feeding range is different, and the circumference is different. When the rotating assembly rotates at a constant angular velocity, the time for one rotation is fixed, and the amount of bait fed is also fixed, but the feeding range formed is different. The larger the diameter, the larger the feeding range, and therefore the distribution of bait on the water surface is uneven. In the present embodiment, a rotation adjusting assembly is provided. A connecting rod 217 is movably connected to the first gear 215. The other end of the connecting rod 217 is movably connected to the piston rod of a low-friction air cylinder 218. The piston rod is connected with an electronic ruler 219. When the angle of the spray head 214 changes, a movement data can be generated on the piston rod. Through the corresponding relationship between the movement data and the angle, and the corresponding relationship between the angle and the feeding distance, the electronic ruler 219 collects the movement data of the piston rod and feeds back to the control module. The control module adjusts the rotation speed of the servo motor 213 of the rotating assembly, so that the circular ring-shaped feeding range of the algae liquid formed by the spray head 214 at different elevation angles has an equal linear velocity, and the algae liquid is uniformly distributed on the water surface.

[0038] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A recirculating water shellfish larviculture / aquaculture system, characterized by: The algae continuous culture system comprises a photobioreactor, a reactor main body, a cultivation pool, a circulating water treatment system, and an automatic feeding device. The reactor comprises an automatic feeding device, which comprises a spray head, a rotating assembly, and a spray head angle adjusting assembly. The reactor further comprises a rotating adjusting assembly, which is used to adjust the rotating angular velocity of the rotating assembly so that the linear velocity of the circular feeding area formed by the spray head at different angles is equal.

2. A recirculating water shellfish seed growing / culturing system according to claim 1 wherein: The reactor further comprises a measuring system, which monitors the production stage of the algae in the photobioreactor, the algae cell density in the photobioreactor, and the algae cell density in the cultivation pool.

3. A recirculating water shellfish seed growing / culturing system according to claim 1 wherein: The reactor main body comprises an auxiliary pipeline and a control valve.

4. A recirculating water shellfish seed growing / culturing system according to claim 2, wherein: The algae continuous culture system further comprises a seawater electrolysis disinfection system and a growth environment adjusting system.

5. A recirculated water shellfish seed growing / culturing system according to claim 1 wherein: The measuring system comprises a chlorophyll fluorescence online measuring device.

6. A recirculating water shellfish seed growing / culturing system according to claim 2, wherein: The cultivation tank comprises heat exchange coil and oxygen increasing facility, the measuring system monitors the density of algal cells in the cultivation tank, and the control module controls the automatic feeding device to feed so that the cultivation tank maintains the density of microalgal cells at 5~8×10 4 cell / mL.

7. A recirculated water shellfish seed growing / culturing system according to claim 1 wherein: The cultivation pool comprises a bottom drainage device, which is connected to a water level maintainer via a pipeline.

8. A recirculating water shellfish seed growing / culturing system according to claim 7, characterised in that: The rotating assembly comprises a rotating table, a transmission device, and a servo motor. The spray head angle adjusting assembly comprises a first gear, and the spray head is fixed on the first gear and adjusted in elevation by the first gear. The first gear is a sector gear, and a connecting rod is movably connected to the first gear. The other end of the connecting rod is movably connected to the piston rod of a cylinder. The piston rod is connected to an electronic ruler, which collects the movement data of the piston rod and feeds back to the servo motor control module of the rotating assembly. The control module controls the rotating speed of the servo motor of the rotating assembly.

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