Scale device for fixing and measuring biological characteristics of roes and larvae

Abstract

The invention discloses a scale device for fixing and measuring biological characteristics of roes and larvae, and belongs to the field of aquatic organism characteristic measuring instruments. The device comprises a micrometer, the micrometer is composed of a micrometer outer frame, a left caliper and a ratchet sleeve, and a right caliper and a rotating nut are arranged in the ratchet sleeve. The micrometer outer frame is provided with an embedding groove, and a glass measuring bin is placed in the groove. Before measurement, roes or larvae needing to be measured are put into the glass measuring bin to be fixed. The left caliper is fixed at the left end of the glass measuring bin, and the right caliper extends from the right side. The device is placed under a microscope for observation, and the nut is rotated to drive the right caliper to move leftwards until the right caliper touches roes or larvae. And the scale is confirmed through a microscope, and the roe diameter or the larval fish body length is read. After measurement, the rotating nut rotates to enable the right caliper to return, so that a new glass measurement bin can be conveniently replaced for batch measurement. According to the scale measuring device, the glass measuring bin can be quickly replaced, so that multiple batches of fish eggs or larvae can be efficiently measured, and the experiment efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of aquatic biological characteristic measuring instruments, and in particular relates to a ruler device for fixing and measuring biological characteristics of fish eggs and fry. Background Art

[0002] The early life history stage of fish is a period when the morphology, ecology and other aspects of individual fish are in dynamic changes. This stage includes three stages: egg (embryo), larvae and juveniles. The embryonic stage is from the fertilized egg to the moment of hatching, the larvae stage is from hatching to the appearance of scales, and the juvenile stage is from the appearance of scales to the completion of scales. The early life history stage of fish is the most vulnerable and has the highest mortality period in the life cycle of fish. The survival rate in this stage is one of the main reasons for changes in the number and age structure of fish populations. Morphological research on the three stages of fish eggs, larvae and juveniles is the basis and premise for the study of the early life history of fish. Related research helps to construct a growth model for early individuals of fish, explore the growth and development characteristics of early individuals of different fish species, and lay the foundation for the study of the early life history of related fish species. Since fish eggs or fry are small, ordinary rulers cannot accurately measure biological indicators such as egg diameter or body length. Therefore, the measurement of biological indicators of fish at different early stages, such as egg diameter, oil ball diameter or body length of fry, requires high precision of instruments. Currently, the tools used for related measurements include microscope micrometers or stereo microscopes.

[0003] Fish eggs and fry collected during field surveys in the ocean are usually preserved in a 5% formaldehyde seawater solution. Due to the fixation effect of formaldehyde, the bodies of fry are already stiff and may be bent or curled, which is not suitable for direct morphological measurement. Therefore, according to the biological characteristics of early fish individuals, designing a new device that can fix and accurately measure the body length of fish eggs, fry and fry will help improve the current situation and effectively promote and improve the research on the early life history of fish.

[0004] At present, the measuring tools applied to the ecological characteristics of the early life history stage of fish are relatively simple. Generally, the selected fish eggs or fry are placed in a small-caliber culture dish, placed under an observation microscope, and directly roughly measured by a micrometer installed on the eyepiece of a microscope or using a stereo microscope with a high-definition camera function, by shooting biological images for measurement. The above methods are still somewhat cumbersome during the measurement process, so some instruments with simple measuring methods arise at the historic moment, such as the existing public technology CN203313891U is a chessboard-type fish egg diameter, which can measure the biological characteristics of live eggs and small fry, but it still has room for improvement in terms of the measurement of multiple quantities and batches of fish eggs and fry. Summary of the invention

[0005] The invention aims to provide a measuring tool for measuring biological characteristic indicators of fish eggs or fry, such as egg diameter and body length, which can fix the measured object, is simple to operate, low in price and accurate in measurement, and can quickly measure fish eggs and fry in batches.

[0006] A scale device for fixing and measuring biological characteristics of fish eggs and fry comprises a micrometer, wherein the micrometer comprises a micrometer outer frame, a left caliper is arranged at the left end of the micrometer outer frame, a ratchet sleeve is arranged above the micrometer outer frame, a right caliper and a rotating nut are arranged in the ratchet sleeve, and the micrometer outer frame has an embedding groove in which a glass measuring chamber is arranged.

[0007] Before measuring, the roe or fry to be measured can be put into the glass measuring chamber and fixed first, the left caliper can be fixed at the left end of the glass measuring chamber, the right caliper can stretch into the glass measuring chamber from the right side of the glass measuring chamber, the whole measuring device is placed on the microscope eyepiece below to observe the roe or fry zone, then the rotating nut is rotated, the rotating nut drives the right caliper to move left gradually, when the right caliper touches the roe or fry, the scale on the microscopic glass measuring chamber is confirmed to be the roe egg diameter or the fry body length. After measuring, the right caliper is driven to return to its original position with the rotating nut, the glass measuring chamber is taken out from the embedding groove, the new glass measuring chamber of putting into the same size is measured in batches to the roe egg diameter or the fry body length, the scale device of the present invention can change the glass measuring chamber fast, and the roe or fry are measured in batches efficiently.

[0008] A scale device for fixing and measuring biological characteristics of fish eggs and fry. A glass measuring chamber comprises a chassis. A right caliper opening is arranged on one side of the chassis adjacent to a ratchet sleeve, and a left caliper opening is arranged on the other side of the chassis. The surface of the chassis is covered with a glass panel, and a cavity is arranged between the chassis and the glass panel.

[0009] The bottom plate is used for placing fish eggs or fish larvae, the left caliper opening is used for inserting the left caliper, and the right caliper opening is used for inserting the right caliper. The glass panel covers the surface of the bottom plate and is used for pressing the fish eggs or fish larvae. The transparent nature of the glass panel also makes it convenient for operators to adjust the position of the fish eggs or fish larvae and observe the fish eggs or fish larvae with a microscope. The cavity between the glass panel and the bottom plate is the position area where the fish eggs or fish larvae can be adjusted.

[0010] A scale device for fixing and measuring biological characteristics of fish eggs and fry, wherein the diameter of the right caliper opening is the same as the diameter of the right caliper, and the diameter of the left caliper opening is the same as the diameter of the left caliper. When the fish eggs or fry are placed in a glass measuring chamber to adjust their positions, a small amount of water is injected into the glass measuring chamber, and the water is absorbed with absorbent cotton after the positions of the fish eggs or fry are adjusted. The diameter of the right caliper opening is the same as the diameter of the right caliper, and the diameter of the left caliper opening is the same as the diameter of the left caliper, so that there is no gap between the diameter of the right caliper opening and the right caliper, and the diameter of the left caliper opening and the left caliper, so as to prevent water from flowing out of the right caliper opening or the left caliper opening, and improve the cleaning efficiency of the instrument after measurement.

[0011] A scale device for fixing and measuring the biological characteristics of fish eggs and fry, wherein the bottom plate is provided with a scale, the scale has marking lines, and the top of the glass panel is connected to the outside world. When measuring the ecological parameters of fish eggs or fry, the glass measuring chamber is placed horizontally, and a small amount of water is injected from the top to reduce the friction between the fish eggs, fry and fry and the glass and bottom plate, and then the dissecting needle is inserted into the top to push the fish eggs or fry to the left caliper, and then the water is sucked dry to increase the friction between the fish eggs, fry and fry and the glass and bottom plate, thereby fixing the position of the fish eggs or fry. The top is connected to the outside world in order to inject or drain water, so as to facilitate the insertion of the dissecting needle to adjust the position of the fish eggs and fry.

[0012] A scale device for fixing and measuring biological characteristics of fish eggs and fry, the scale accuracy is at least 0.01cm, the leftmost end of the scale is a scale line, the scale line is strictly flush with the right end of the left caliper mouth, each adjacent scale line is separated by an integer multiple of 0.1cm and the multiple is less than 20, and the scale line extends from the upper end to the lower end of the bottom plate.

[0013] When measuring the body length of fish eggs or fry, the operator uses a dissecting needle to straighten the body of the fry before measuring, pushes the fish eggs or fry to the scale line, puts the glass measuring chamber into the embedding slot, and extends the left caliper into the left caliper mouth. In this case, the right end of the left caliper and the right end of the left caliper mouth are strictly flush with the scale line, then the rotating nut is turned to drive the right caliper to move to the left, and when the right caliper is against the right side of the fish eggs or fry, it stops, and the value is read from the scale with a microscope. The value read is the egg diameter of the fish eggs or the body length of the fry to be measured. The marking line extends from the upper end to the lower end of the chassis, providing an obvious reference line when measuring the biological characteristics of fish eggs or fry, which is convenient for the operator to align the marking line for measurement and improves the measurement efficiency.

[0014] A scale device for fixing and measuring biological characteristics of fish eggs and fry, wherein the overall thickness of the frame of the glass measuring chamber is between 7.8 and 8.2 millimeters, and the thickness of the bottom plate is between 2.5 and 3.5 millimeters.

[0015] A scale device for fixing and measuring the biological characteristics of fish eggs and fry, the base material of which is uniform frosted glass with a friction coefficient between 0.7 and 0.8. The surface of the uniform frosted glass is processed to form tiny concave and convex structures, which increase the contact area between the surface and the contact object, thereby increasing the friction, making it easier for the base to fix the position of fish eggs and fry after the absorbent cotton absorbs water. Compared with ordinary glass, uniform frosted glass is less likely to accumulate dust, and it is more convenient to clean and maintain the instrument after measurement.

[0016] A ruler device for fixing and measuring the biological characteristics of fish eggs and fry, with a digital display screen on the outer frame of the micrometer. The digital display screen can display the size measured by the micrometer, and the specific details can be referred to the disclosed technology CN201050973Y. The numbers displayed on the digital display screen can be compared with the scale values ​​read from the scale by a microscope to judge the accuracy of the measured values. An error value can be set before the experiment. If it is within the error value, it means that the measured value is accurate. A ruler device for fixing and measuring the biological characteristics of fish eggs and fry, with one end of the rotating nut connected to a handle. The handle is convenient for operators to hold and move the entire ruler device.

[0017] The advantages of the present invention are that the glass measuring chamber can be quickly replaced, and multiple batches of fish eggs or fry can be measured efficiently. Water can be effectively prevented from flowing out from the right caliper port or the left caliper port, thereby improving the cleaning efficiency of the instrument after measurement. The top of the glass measuring chamber is connected to the outside world, which is convenient for inserting the dissection to adjust the position of the fish eggs and fry. The marking line of the glass measuring chamber extends from the upper end to the lower end of the chassis, providing an obvious reference line when measuring the biological characteristics of the fish eggs or fry, thereby greatly improving the measurement efficiency. The digital display screen can display the distance measured by the micrometer, and the displayed value is compared with the scale value read on the microscope, thereby improving the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 The present invention provides an overall schematic diagram of a scale device for fixing and measuring biological characteristics of fish eggs and fry.

[0020] Figure 2 A schematic diagram of a glass measuring chamber of a scale device for fixing and measuring biological characteristics of fish eggs and fry provided by the present invention.

[0021] Figure 3 This is a schematic diagram of Example 2 of a scale device for fixing and measuring biological characteristics of fish eggs and fry provided by the present invention.

[0022] Figure 4 This is a schematic diagram of Example 3 of a scale device for fixing and measuring biological characteristics of fish eggs and fry provided by the present invention.

[0023] Explanation of the accompanying drawings: 1-glass measuring chamber, 2-micrometer, 11-scale, 11a-marking line, 12-left caliper, 13-right caliper, 14-left caliper opening, 15-chassis, 16-right caliper opening, 17-glass panel, 17a-top, 18-cavity, 19-0 scale line, 21-ratchet sleeve, 22-rotating nut, 23-handle, 24-digital display screen, 25-embedded slot, 26-micrometer frame. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] Embodiment 1: See attached Figure 1 As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry includes a micrometer 2, the micrometer 2 includes a micrometer outer frame 26, a left caliper 12 is provided at the left end of the micrometer outer frame 26, a ratchet sleeve 21 is provided above the micrometer outer frame 26, a right caliper 13 and a rotating nut 22 are provided in the ratchet sleeve 21, and the characteristic is that the micrometer outer frame 26 has an embedding groove 25, and a glass measuring chamber 1 is provided in the embedding groove 25.

[0027] Before measuring, the roe or fry to be measured can be put into the glass measuring chamber 1 and fixed first, left caliper 12 can be fixed at the left end of glass measuring chamber 1, right caliper 13 can stretch into the glass measuring chamber 1 from the right side of glass measuring chamber 1, whole measuring equipment is placed on the microscope eyepiece below and observes the roe or fry zone, then rotate the rotating nut 22, the rotating nut 22 drives the right caliper 13 to move left gradually, when the right caliper 13 touches the roe or fry, the scale on the microscopic glass measuring chamber 1 is confirmed to be the roe egg diameter or the fry body length. After measuring, drive the right caliper 13 back to position with the rotating nut 22, the glass measuring chamber 1 is taken out from the embedding groove 25, the new glass measuring chamber 1 of putting into same size is measured in batches to the roe egg diameter or the fry body length, the scale device of the present invention can change the glass measuring chamber 1 fast, and the roe or fry of many batches are measured efficiently.

[0028] See attached Figure 1 , Attachment Figure 2 As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry is shown. The glass measuring chamber 1 includes a chassis 15. A right caliper opening 16 is provided on one side of the chassis 15 adjacent to the ratchet sleeve 21, and a left caliper opening 14 is provided on the other side of the chassis 15. The surface of the chassis 15 is covered with a glass panel 17, and a cavity 18 is provided between the chassis 15 and the glass panel 17.

[0029] See attached Figure 1 , Attachment Figure 2 As shown, the bottom plate 15 is used for placing fish eggs or fish larvae, the left caliper opening 14 is used for the left caliper 12 to extend into, and the right caliper opening 16 is used for the right caliper 13 to extend into. The glass panel 17 covers the surface of the bottom plate 15 and is used for pressing the fish eggs or fish larvae. The transparent nature of the glass panel 17 also facilitates operators to adjust the position of the fish eggs or fish larvae and observe the fish eggs or fish larvae with a microscope. The cavity 18 between the glass panel 17 and the bottom plate 15 is the position area where the fish eggs or fish larvae can be adjusted.

[0030] See attached Figure 1 , Attachment Figure 2 As shown, a scale device for fixing and measuring biological characteristics of fish eggs and fry is shown, wherein the diameter of the right caliper opening 16 is the same as the diameter of the right caliper 13, and the diameter of the left caliper opening 14 is the same as the diameter of the left caliper 12. When the fish eggs or fry are placed in the glass measuring chamber 1 to adjust their positions, a small amount of water is injected into the glass measuring chamber 1, and the water is sucked dry with absorbent cotton after the positions of the fish eggs or fry are adjusted. The diameter of the right caliper opening 16 is the same as the diameter of the right caliper 13, and the diameter of the left caliper opening 14 is the same as the diameter of the left caliper 12, so that there is no gap between the diameter of the right caliper opening 16 and the right caliper 13, and the diameter of the left caliper opening 14 and the left caliper 12, so as to prevent water from flowing out of the right caliper opening 16 or the left caliper opening 14, and improve the cleaning efficiency of the instrument after measurement.

[0031] See attached Figure 1 , Attachment Figure 2 Shown, a kind of scale device for fixing and measuring the biological characteristics of fish eggs and fry, chassis 15 is provided with scale 11, scale 11 has mark line 11a, and glass panel 17 top 17a is communicated with the outside world.When measuring the ecological parameters of fish eggs or fry, glass measuring chamber 1 is placed horizontally, a small amount of water can be injected from top 17a to reduce the friction between fish eggs, fry and fry and glass, chassis, then the dissecting needle is operated to stretch into top 17a to push fish eggs or fry to left caliper 14, then the water is sucked dry to increase the friction between fish eggs, fry and fry and glass, chassis thereby fix the fish eggs or fry position.Top 17a is communicated with the outside world in order to inject or derive water, and conveniently stretch into dissection to adjust the position of fish eggs and fry.

[0032] Refer to the attached Figure 1 As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry, the scale 11 has an accuracy of at least 0.01 cm, the leftmost end of the scale 11 is the 0 scale line 19, the 0 scale line 19 is strictly flush with the right end of the left caliper mouth 14, each adjacent marking line 11a is separated by an integer multiple of 0.1 cm and the multiple is less than 20, and the marking line 11a extends from the upper end to the lower end of the chassis 15.

[0033] Refer to the attached Figure 1 , Attachment Figure 2 Shown in the figure, when measuring the body length of roe or fry, the operator puts the fry posture of fry in place with the dissecting needle before measuring, the dissecting needle pushes roe or fry to 0 scale mark 19, the glass measuring chamber 1 is put into the embedding groove 25, and the left caliper 12 stretches into the left caliper mouth 14. In this case, the right ends of the left caliper 12 and the left caliper mouth 14 are strictly flush with 0 scale mark 19, then the right ends of the left caliper 12 and the left caliper mouth 14 are rotated and driven by the right caliper 13 to move to the left, when the right caliper 13 withstands the right side of roe or fry, stop, read the numerical value from the scale 11 with a microscope, the numerical value read is the roe egg footpath or the fry body length to be measured. The marking line 11a extends to the lower end from the upper end of the chassis 15, provides obvious reference line when measuring roe or fry biological characteristics, makes it convenient for the operator to measure the marking line 11a, improves measurement efficiency.

[0034] Refer to the attached Figure 2 As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry is shown, wherein the overall thickness of the frame of the glass measuring chamber 1 is between 7.8 and 8.2 mm, and the thickness of the bottom plate 15 is between 2.5 and 3.5 mm.

[0035] Refer to the attached Figure 2As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry, the base plate 15 is made of uniform frosted glass, and the friction coefficient is between 0.7 and 0.8. The surface of the uniform frosted glass is processed to form tiny concave-convex structures, which increase the contact area between the surface and the contact object, thereby increasing the friction, making it convenient for the base plate 15 to fix the position of the fish eggs and fry after the absorbent cotton absorbs water. Compared with ordinary glass, uniform frosted glass is less likely to accumulate dust, and it is more convenient to clean and maintain the instrument after measurement.

[0036] See attached Figure 1 As shown, a scale device for fixing and measuring biological characteristics of fish eggs and fry is provided, and a digital display screen 24 is provided on a micrometer outer frame 26. The digital display screen 24 can display the size measured by the micrometer 2, and specific reference can be made to the disclosed technology CN201050973Y. The numbers displayed on the digital display screen 24 can be compared with the scale values ​​read by the microscope from the scale 11, so as to judge the accuracy of the measured values. An error value can be set before the experiment. If the values ​​read by the microscope and the values ​​displayed on the display screen are within the error value, it means that the values ​​read and measured by the microscope are accurate.

[0037] See attached Figure 1 As shown, a scale device for fixing and measuring the biological characteristics of fish eggs and fry, one end of the rotating nut 22 is connected to the handle 23. The handle 23 is convenient for the operator to hold and move the entire scale device.

[0038] Embodiment 2: See attached Figure 3 Shown, the present embodiment purpose is to measure the body length of fry and juvenile fish, the operator goes out and adds water from breach 17a before measuring, stretches into with dissecting needle from breach 17a and earlier corrects the posture of fry and juvenile fish, the left side of fry and juvenile fish is pushed to 0 scale line 19 place, thereby fixes fry and juvenile fish by absorbing water cotton in glass measuring storehouse 1.Then glass measuring storehouse 1 is horizontally put into embedding groove 25, rotates rotating nut 22 and drives right caliper 13 to move to the left, stops rotating rotating nut 22 when right caliper 13 withstands the right side of fry and juvenile fish, reads the numerical value a of scale with microscope, numerical value a is the body length of fry and juvenile fish.All the other measuring step details are identical with embodiment 1, and the present embodiment will not repeat them again.

[0039] Embodiment 3: See attached Figure 4Shown, the present embodiment purpose is in order to measure the eye diameter of larvae and juvenile fish, each adjacent marking line 11a is separated by 1cm in the present embodiment, when measuring the characteristic of the internal characteristics of the fish egg oil ball diameter or the eye diameter of larvae and juvenile fish, this internal characteristics cannot be placed on the position of 0 scale line 19, so will use marking line 11a.The zone of the leftmost end of the fish egg and juvenile fish eye can be placed on the 1cm marking line 11a place, at this moment, the larvae and juvenile fish position is preferably near below the right caliper 13 through the region, when the observation microscope is flush with the right end of the fish eye of larvae and juvenile fish, stop rotating the rotating nut 22, read the numerical value b of scale 11 with microscope, numerical value b deducts 1cm and is the length value of the fish eye to be measured, and this ruler device can read the measurement data of fish egg or larvae and juvenile fish internal characteristics. All the other measuring step details are identical with embodiment 1, and the present embodiment will not repeat them.

[0040] Embodiment 4: The digital display screen 24 can display the size measured by the micrometer 2. For details, please refer to the disclosed technology CN201050973Y. The numbers displayed on the digital display screen 24 can be compared with the scale values ​​read by the microscope from the scale 11. The internal calculation unit of the digital display screen 24 can add a wireless data transmission unit, and the calculated data can be transmitted to an external computer. The microscope is connected to the same external computer, and the scale values ​​read by the microscope from the scale 11 are also imported into the computer, so as to be compared with the data transmitted by the calculation unit. The error value is set in advance. If the error value between the value obtained by the calculation unit and the value read by the microscope is greater than the set error value, the computer will alarm and remind you to re-measure or check the equipment problem. The details of the remaining measurement steps are the same as those in Example 1, and will not be repeated in this embodiment.

[0041] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0042] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A scale device for fixing and measuring biological characteristics of fish eggs and fry, comprising a micrometer (2), the micrometer (2) comprising a micrometer outer frame (26), a left caliper (12) at the left end of the micrometer outer frame (26), a ratchet sleeve (21) above the micrometer outer frame (26), a right caliper (13) and a rotating nut (22) inside the ratchet sleeve (21), characterized in that: The micrometer outer frame (26) has an embedding groove (25), and a glass measuring chamber (1) is arranged in the embedding groove (25).

2. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 1, characterized in that The glass measuring chamber (1) comprises a chassis (15), a right caliper opening (16) is provided on one side of the chassis (15) adjacent to the ratchet sleeve (21), and a left caliper opening (14) is provided on the other side of the chassis (15), a surface of the chassis (15) is covered with a glass panel (17), and a cavity (18) is provided between the chassis (15) and the glass panel (17).

3. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 2, characterized in that The chassis (15) is provided with a scale (11), the scale (11) has marking lines (11a), and the top (17a) of the glass panel (17) is in communication with the outside.

4. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 2, characterized in that The chassis (15) is made of uniform frosted glass, and has a friction coefficient between 0.7 and 0.

8.

5. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 3, characterized in that: The scale (11) has an accuracy of at least 0.01 cm, the leftmost end of the scale (11) is a 0 scale line (19), the 0 scale line (19) is strictly flush with the right end of the left caliper opening (14), each adjacent marking line (11a) is separated by an integer multiple of 0.1 cm and the multiple is less than 20, and the marking line (11a) extends from the upper end to the lower end of the chassis (15).

6. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 1, characterized in that The diameter of the right caliper opening (16) is the same as the diameter of the right caliper (13), and the diameter of the left caliper opening (14) is the same as the diameter of the left caliper (12).

7. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 1, characterized in that The overall thickness of the frame of the glass measuring chamber (1) is between 7.8 and 8.2 millimeters, and the thickness of the bottom plate (15) is between 2.5 and 3.5 millimeters.

8. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 1, characterized in that: A digital display screen (24) is provided on the micrometer outer frame (26).

9. A scale device for fixing and measuring the biological characteristics of fish eggs and fry according to claim 1, characterized in that: One end of the rotating nut (22) is connected to the handle (23).

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