Separating device for eggs and shells of fairy shrimps

Abstract

The utility model discloses a separation device for fairy shrimp egg shells, which comprises a body and an inlet, and is characterized by further comprising a separation channel which is communicated with fluid at the inlet and is provided with a lamp body for inducing fairy shrimp nauplii to move along a preset path of the separation channel; according to the separation device, a lamp body for luring fairy shrimp nauplii to swim along a preset path of a separation channel is arranged in the separation channel through the separation channel, and the fairy shrimp nauplii swim to the tail end of the separation channel along the separation channel by utilizing the phototaxis of the fairy shrimp nauplii; empty egg shells, unhatched dead eggs and / or eggs being hatched cannot swim autonomously and stay near the entrance, so that the eggs and the shells of the fairy shrimps are separated, the separation method can avoid the influence of an existing separation method on the activity of nauplii of the fairy shrimps, and the eggs and the shells are separated safely and effectively.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture technology and relates to a device for separating Artemia egg shells. Background Technology

[0002] Artemia, also known as brine shrimp, is a small, salt-tolerant crustacean widely distributed worldwide. Due to its high nutritional value and the ease of preservation and transportation of its dormant eggs, Artemia has become a very important feed organism in aquaculture.

[0003] However, after artificial hatching, the outer shell of Artemia eggs mixes with the nauplius larvae. The eggshell is an iron-containing lipoprotein that early-stage fish fry cannot utilize. Ingestion of this shell can cause indigestion, leading to intestinal inflammation and obstruction, directly threatening the fry's health. Furthermore, the eggshell may carry pathogens, which can easily deteriorate water quality in fry rearing ponds, creating a potential risk of disease outbreaks and affecting fry survival rates. Therefore, separating the eggshells from artificially hatched Artemia eggs before feeding is crucial.

[0004] Existing separation technologies mainly include the following: 1. Physical sieving method, such as the separation device disclosed in CN218923991U. This device utilizes the size difference between the nauplius larvae and eggshells of Artemia salina and selects a filter screen with an appropriate pore size for collection. However, due to individual differences in the larvae, the separation effect is not ideal; 2. Chemical dissolution method, such as the decapitation treatment method in CN110089466B. This method dissolves the eggshells with sodium hypochlorite solution, and then fully dissolves the keratin of the egg membrane with an ethanol solution of shikonin. This method can maintain the integrity of the embryo and 1. Activity: This method exposes the embryos of the eggs. However, the oxidants used, such as sodium hypochlorite, may remain on the nauplii and be introduced into the pond, causing toxicity to farmed organisms (such as fish fry). 2. Temperature control method: For example, the separation method published in CN105684970A separates the nauplii from the eggshell by lowering the temperature under incubation conditions. After raising the temperature, the survival rate of the nauplii is high. However, if the temperature drop is insufficient or the static time is not long enough, the separation effect between the eggshell and the nauplii is poor. If the low temperature time is too long, it will affect the vitality and subsequent growth of the nauplii.

[0005] In summary, existing techniques for separating Artemia nauplii from their eggshells still need improvement. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a separation device that can safely and effectively separate Artemia nauplii from eggshells, in light of the above-mentioned existing technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: the artichoke eggshell separation device includes:

[0008] ontology;

[0009] An inlet, located in the body, is used to receive a collection containing water, Artemia nauplii, empty eggshells, unhatched dead eggs, and / or hatching eggs.

[0010] Its characteristic is that it further includes:

[0011] A separation channel, which is in fluid communication with the inlet, is equipped with a lamp body to lure Artemia nauplii larvae to swim along a preset path in the separation channel;

[0012] The first baffle, used to intercept empty eggshells, unhatched dead eggs and / or incubating eggs floating on the water, is located in the separation channel and adjacent to the entrance, extending upward from the bottom of the separation channel and leaving a first gap with the top of the separation channel;

[0013] The second baffle, used to intercept unhatched dead eggs and / or hatching eggs that have sunk to the bottom of the water, is located in the separation channel and upstream or downstream of the first baffle. It extends downward from the top of the separation channel and leaves a second gap with the bottom of the separation channel. The nauplius larvae of Artemia enter the predetermined path of the aforementioned separation channel by means of the first gap and the second gap.

[0014] To ensure that empty eggshells, unhatched dead eggs, and / or hatching eggs are intercepted by the first and second baffles, preferably, the height H of the separation channel, the height h1 of the first baffle, and the height h2 of the second baffle satisfy: h1 + h2 ≥ H. Since empty eggshells, unhatched dead eggs, and / or hatching eggs will flow with the water currents generated by the swimming of Artemia nauplii, if the heights of the first and second baffles are too small, some empty eggshells, unhatched dead eggs, and / or hatching eggs suspended in the water will not be intercepted by either the first baffle at the bottom or the second baffle at the top. Therefore, the heights of the first and second baffles are designed such that h1 + h2 ≥ H, so that the first and second baffles can completely cover the separation channel in height. Only Artemia nauplii capable of active swimming bypass the first and second baffles and enter the predetermined path of the separation channel from the first and second gaps.

[0015] To minimize the space occupied by the separation channel, preferably, the separation channel is a spiral channel with a preset width, height, and radius of curvature, spiraling outwards from the center. Adjacent spiral channels share a common wall, on which at least two lamps are spaced apart. The entrance is located in the central region of the spiral channel. The system also includes a controller connected to the lamps, configured to control the lamps to turn on sequentially from the central region of an adjacent spiral channel outwards, turning off the previous lamp as the next lamp turns on, thus causing the Artemia nauplii larvae to flow unidirectionally along the lamps to the end of the spiral channel. Designing the separation channel as a spiral channel has two advantages: firstly, the spiral design makes the separation device more compact, reducing its size; secondly, the walls of the spiral channel can block the light from the lamps, preventing interference between lights in adjacent spiral channels and also preventing the Artemia nauplii larvae from escaping.

[0016] Furthermore, the spiral channel has an upward-facing open mouth, which is covered by a cap. The cap covers the upper part of the mouth, keeping the spiral channel dark so that only the lamp attracts the Artemia, thus avoiding the influence of external light.

[0017] To facilitate the insertion of Artemia nauplii, empty eggshells, unhatched dead eggs, and / or hatching eggs into the inlet, preferably, the cover is provided with a feeding port and a switch that can open and close the feeding port, which is connected to the inlet. The switch allows the feeding port to be opened when feeding is needed and closed after feeding is complete, preventing external light from entering the feeding port and affecting the separation of Artemia nauplii. The switch can be configured to rotate or slide with the cover to open and close the feeding port.

[0018] Furthermore, the cover is detachably connected to the top of the wall. This detachable connection allows the cover to be removed after use to expose the opening, facilitating cleaning.

[0019] To attract nauplius larvae with different incubation times to swim along a preset path in the separation channel, preferably, the lamp body includes a first lamp body for guiding nauplius larvae with an incubation time greater than 24 hours and a second lamp body for guiding nauplius larvae with an incubation time less than 24 hours. A second lamp body is provided every other first lamp body, or a first lamp body is provided every other second lamp body. Since nauplius larvae with incubation times greater than 24 hours and those with incubation times less than 24 hours exhibit different phototaxis to different lamp bodies, two different lamp bodies are used to attract nauplius larvae with incubation times greater than 24 hours and those with incubation times less than 24 hours, thereby separating nauplius larvae with different incubation times. Specifically, the lamp body arrangement can be selected based on the actual separation effect, such as alternating between the first and second lamp bodies, or providing a first lamp body every two second lamp bodies, etc.

[0020] To accommodate the different phototactic behaviors of Artemia nauplii at different hatching times, preferably, the first lamp is an orange lamp and the second lamp is a green lamp. Since Artemia nauplii are more attracted to orange and green light, orange and green lamps are chosen as the lamps to lure them along a predetermined path in the separation channel. However, Artemia nauplii older than 24 hours show better phototactic behavior to orange lamps, while those younger than 24 hours show better phototactic behavior to green lamps. Therefore, an orange lamp is chosen as the first lamp and a green lamp as the second lamp.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] 1. The separation device uses a separation channel and includes a lamp within the channel to attract Artemia nauplii larvae to swim along a predetermined path. Utilizing the phototaxis of the nauplii larvae, they swim along the separation channel to its end. Empty eggshells, unhatched dead eggs, and / or hatching eggs cannot swim independently and thus remain near the entrance, thereby separating the eggshells. This separation method avoids the impact of existing separation methods on the activity of Artemia nauplii larvae and safely and effectively separates the eggshells.

[0023] 2. The first and second baffles can intercept empty eggshells, unhatched dead eggs and / or hatching eggs, preventing them from flowing towards the end of the separation channel with the movement of Artemia nauplii larvae, thus further ensuring the effectiveness of separation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the separation device (removal of the cover) in an embodiment of the present invention;

[0025] Figure 2 This is an exploded schematic diagram of the separation device in an embodiment of this utility model;

[0026] Figure 3 This is a cross-sectional view of the separation device in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram showing the state of the switch component opening the feeding port in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram showing the state of the switch component closing the feeding port in an embodiment of this utility model;

[0029] Figure 6 Phototaxis of Artemia nauplii at different hatching times under different colored lights.

[0030] Figure 7 This is a graph showing the phototaxis of Artemia nauplii to different colors of light. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-7 The figure shown is a preferred embodiment of the present invention.

[0033] The Artemia eggshell separation device of this embodiment includes a body 1, on which a separation channel is provided. The separation channel of this embodiment is shown in [reference needed]. Figure 1-3The spiral channel 3, which spirals outward from the center and has a predetermined width, height, and radius of curvature, is provided in the central region of the spiral channel 3. An inlet 2 is provided for receiving a collection containing water, Artemia nauplii larvae, empty eggshells, unhatched dead eggs, and / or hatching eggs. This inlet 2 is in fluid communication with a separation channel. Adjacent spiral channels 3 share a common wall 31. At least two lamps 4 are spaced apart on this wall 31 to attract Artemia nauplii larvae along a predetermined path within the spiral channel 3. Each lamp 4 is communicatively connected to a controller configured to: control the lamps 4 to turn on sequentially from the central region of the adjacent spiral channel 3 outwards, and to turn off the previous lamp 4 as the next lamp 4 turns on, thereby causing the Artemia nauplii larvae to flow unidirectionally along the lamps 4 with the water flow to the end of the spiral channel 3. In use, the spiral channel 3 is filled with hatching solution. Artemia nauplii, empty eggshells, unhatched dead eggs, and / or a collection of hatching eggs are added through inlet 2. The lamp 4 is then turned on. Due to the phototaxis of the Artemia nauplii, they move along the spiral channel 3 towards the lamp 4. As the lamp 4 opens sequentially outwards along the spiral channel 3, the Artemia nauplii flow unidirectionally along the spiral channel 3 with the water flow to the end of the spiral channel 3, where they are collected. This embodiment creatively designs the separation channel as a spiral channel 3. Compared to straight or other shaped separation channels, this design is more compact, reducing the device size, and also blocks the light from the lamp 4, thus preventing complementary interference between lights in adjacent spiral channels 3 and preventing the Artemia nauplii from migrating back. Due to the design of the spiral channel 3, the lights of the inner and outer spiral channels 3 do not interfere with each other. When the light body 4 is turned on to the outer circle in sequence, the light body 4 of the inner circle can be turned on again in sequence, which will attract the brine shrimp nauplii that did not follow the previous light to swim to the end of the spiral channel 3, thereby ensuring the effectiveness of brine shrimp nauplii separation.

[0034] The spiral channel 3 has an upward-facing open opening. To prevent external light from affecting eggshell separation, this embodiment covers the opening with a cover 7. This cover 7 is detachably connected to the top of the wall 31 to keep the spiral channel 3 dark, with only the light from the lamp 4 present when it is turned on. In this embodiment, the cover 7 is snap-fitted to the wall 31, and a feeding port 71 and a switch 72 for opening and closing the feeding port 71 are provided on the cover 7. In this embodiment, the switch 72 is hinged to the cover 7. When feeding is required, rotating the switch 72 opens the feeding port 71 to facilitate feeding. Figure 4 As shown, after feeding is complete, rotate switch 72 to close feeding port 71. Figure 5 As shown, this is to prevent external light from entering the feeding port 71 and affecting the separation of Artemia.

[0035] To prevent empty eggshells, unhatched dead eggs, and / or hatching eggs, which need to be separated, from flowing with the water towards the end of the spiral channel 3, this embodiment provides a first baffle 5 near the inlet 2 within the spiral channel 3, and a second baffle 6 upstream of the first baffle 5. The first baffle 5 extends upward from the bottom of the spiral channel 3, leaving a first gap 51 between it and the top of the spiral channel 3. This first baffle 5 can intercept empty eggshells, unhatched dead eggs, and / or hatching eggs floating on the hatching liquid. The second baffle 6 extends downward from the top of the spiral channel 3, leaving a second gap 61 between it and the bottom of the spiral channel 3. This second baffle 6 can intercept unhatched dead eggs and / or hatching eggs that have sunk to the bottom of the hatching liquid. Artemia nauplii can then pass through the second gap 61 and the first gap 51 in sequence to enter the preset path of the separation channel. Although empty eggshells, unhatched dead eggs, and / or hatching eggs cannot actively swim, they will be carried by the water flow generated by the swimming of Artemia nauplii. If the height of the first baffle 5 and the second baffle 6 is small, some empty eggshells, unhatched dead eggs, and / or hatching eggs suspended in the water will not be intercepted by the first baffle 5 at the bottom or the second baffle 6 at the top. Therefore, in this embodiment, the height H of the spiral channel 3, the height h1 of the first baffle 5, and the height h2 of the second baffle 6 are designed such that h1 + h2 ≥ H, that is, the first baffle 5 and the second baffle 6 can completely cover the spiral channel 3 in height. In this way, only Artemia nauplii that can actively swim can bypass the first baffle 5 and the second baffle 6 and enter the preset path of the spiral channel 3 from the first interval 51 and the second interval 61, further ensuring the effectiveness of separation.

[0036] Considering the influence of different colored lamp bodies 4 on the phototaxis of Artemia nauplii, an experiment was conducted to investigate the phototaxis of Artemia nauplii under illumination by different colored lamp bodies 4. The experiment involved 21 transparent plastic boxes measuring 13cm × 7.5cm. The bottom of each box was divided into 5 × 3 small squares, each square measuring 2.6cm × 2.5cm. A lamp body 4 of one color was affixed to the small squares near the bottom of each box, and the box was then wrapped in aluminum foil to eliminate the influence of other colors of light. A control group was selected, where Artemia were allowed to planktonic life under natural light to compare their distribution after illumination by different colored lamp bodies 4. Throughout the experiment, to ensure the uniformity of the experimental variables (i.e., using different colored lamp bodies 4 for illumination), all factors affecting the growth and activity of Artemia were kept consistent across experimental groups, except for the color of the lamp body 4, such as water temperature, feed amount, feeding time, and water change cycle. The day before the experiment began, the brine shrimp were hatched. The hatching status of the brine shrimp was observed under a microscope. If the hatching was good, five hatched brine shrimp were taken out at a time with a pipette and placed into a transparent plastic box with the temperature, pH and salinity pre-adjusted. This process was repeated 12 times, so that each transparent box contained about 60 brine shrimp. The experiment divided 21 transparent plastic boxes into 3 groups of 7, with 5 boxes randomly selected from each group and numbered: 1 for red light, 2 for blue light, 3 for green light, 4 for orange light, and 5 for white light. One of the remaining 2 transparent plastic boxes was randomly selected as the control group, where natural light was used to attract Artemia salsa. Their activity and distribution under natural light were observed. Live Artemia salsa were counted and observed continuously for 5 days, with detailed records kept. The phototaxis rate of Artemia salsa was calculated. Based on the data from the 3 parallel experiments, the average phototaxis rates for each color in the 3 groups were calculated to be 51.7%, 62.0%, 50.8%, 57.2%, and 64.8% respectively (see [reference]). Figure 7 The bar chart shows significant differences (P<0.05) between the different lowercase letters representing the number of Artemia salsa near the five different colored light sources each day. This result indicates that, under the same conditions affecting the phototaxis of Artemia salsa, changing only the light color (white, green, red, blue, orange lamp 4) resulted in the following effect on Artemia salsa: orange > green > blue > white > red. This means that orange, green, and blue light exhibited better phototaxis towards Artemia salsa, while red and white light showed poorer phototaxis. Furthermore, on the first day of the experiment (i.e., when the nauplius larvae had hatched for less than 24 hours), green lamp 4 showed the best phototaxis towards Artemia salsa. However, on the second day (i.e., when the nauplius larvae had hatched for more than 24 hours), orange lamp 4 showed the best phototaxis towards Artemia salsa (see [reference needed]). Figure 6 The different lowercase letters in the bar chart represent significant differences (P<0.05) in the data on the number of Artemia nauplii near the five colored light sources measured each day. Therefore, the lamp body 4 in this embodiment includes a first lamp body 41 that emits orange light to guide Artemia nauplii larvae with an incubation time of more than 24 hours, and a second lamp body 42 that emits green light to guide Artemia nauplii larvae with an incubation time of less than 24 hours. The first lamp body 41 and the second lamp body 42 are arranged alternately. The spacing between adjacent lamp bodies 4 can be selected according to the swimming speed of Artemia nauplii larvae, the width and height of the spiral channel 3, etc. For example, when the height of the spiral channel 3 is 10cm and the width is 20cm, the spacing between adjacent lamp bodies 4 is set to 10cm. Of course, the height and width of the spiral channel 3 and the spacing between adjacent lamp bodies 4 can be selected according to actual needs. When in use, if only Artemia nauplii hatched for more than 24 hours need to be collected, only the first lamp body 41 is turned on sequentially to attract Artemia nauplii hatched for more than 24 hours to swim along the spiral channel 3 to the end; if only Artemia nauplii hatched for less than 24 hours need to be collected, only the second lamp body 42 is turned on sequentially to attract Artemia nauplii hatched for more than 24 hours to swim along the spiral channel 3 to the end; if all Artemia nauplii need to be collected at the same time, the first lamp body 41 and the second lamp body 42 are turned on sequentially, that is, in the order of first lamp body 41-second lamp body 42-first lamp body 41-second lamp body 42, they are turned on outwards along the spiral channel 3 so that all Artemia nauplii swim along the spiral channel 3 to the end.

Claims

1. A device for separating Artemia eggshells, comprising: ontology(1); An inlet (2) is provided on the body (1) for receiving a collection containing water, brine shrimp nauplii, empty eggshells, unhatched dead eggs and / or hatching eggs; Its features are, It also includes: The separation channel is in fluid communication with the inlet (2) and is equipped with a lamp body (4) to attract Artemia nauplii larvae to swim along a preset path of the separation channel; The first baffle (5), used to intercept empty eggshells, unhatched dead eggs and / or incubating eggs floating on the water, is located in the separation channel and adjacent to the entrance (2), extending upward from the bottom of the separation channel and leaving a first gap (51) with the top of the separation channel. The second baffle (6), used to intercept unhatched dead eggs and / or hatching eggs that have sunk to the bottom of the water, is located in the separation channel and upstream or downstream of the first baffle (5). It extends downward from the top of the separation channel and leaves a second gap (61) at the bottom of the separation channel. The nauplius larvae of Artemia enter the predetermined path of the aforementioned separation channel by means of the first gap (51) and the second gap (61).

2. The separation device according to claim 1, characterized in that: The height H of the separation channel, the height h1 of the first baffle (5) and the height h2 of the second baffle (6) satisfy the following condition: h1 + h2 ≥ H.

3. The separation device according to claim 1 or 2, characterized in that: The separation channel is a spiral channel (3) that gradually spirals outward from the center and has a preset width, height and radius of curvature. Adjacent spiral channels (3) share a common wall (31), and at least two lamp bodies (4) are spaced apart on the wall (31). The inlet (2) is located in the central area of ​​the spiral channel (3). The channel also includes a controller that is connected to the lamp body (4). The controller is configured to control the lamp body (4) to open sequentially from the central area of ​​the adjacent spiral channel (3) outward along the spiral channel (3), and to close the previous lamp body (4) at the same time as the next lamp body (4) is opened, so as to cause the nauplii larvae of Artemia to flow unidirectionally along the lamp body (4) with the water flow to the end of the spiral channel (3).

4. The separation device according to claim 3, characterized in that: The spiral channel (3) has an upward-opening opening and is covered by a cover (7).

5. The separation device according to claim 4, characterized in that: The cover (7) is provided with a feeding port (71) and a switch (72) that can open and close the feeding port (71). The feeding port (71) is connected to the inlet (2).

6. The separation device according to claim 4, characterized in that: The cover (7) is detachably attached to the top of the wall (31).

7. The separation device according to claim 1 or 2, characterized in that: The lamp body (4) includes a first lamp body (41) for guiding Artemia nauplii with an incubation time of more than 24 hours and a second lamp body (42) for guiding Artemia nauplii with an incubation time of less than 24 hours. A second lamp body (42) is provided every other first lamp body (41), or a first lamp body (41) is provided every other second lamp body (42).

8. The separation device according to claim 7, characterized in that: The first lamp body (41) is an orange lamp, and the second lamp body (42) is a green lamp.

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