Method for adjusting the aggregation and movement ability of red drum by light color parameters

Abstract

The application discloses a method for adjusting the aggregation degree and the movement ability of redfin snapper through light color parameters, and belongs to the technical field of aquaculture and fish behavior regulation. The method specifically comprises the following steps: (1) constructing a light color regulation behavior monitoring system; (2) respectively performing light color regulation behavior monitoring experiments on fish at different growth stages; (3) calculating and analyzing the aggregation degree and the movement ability of the redfin snapper; (4) determining suitable light color indexes for different growth stages; and (5) proposing light color regulation methods suitable for different growth stages. The method has the advantages of environmental protection, high efficiency, economy and easy operation, avoids pollution and cost problems caused by the use of chemical agents in the traditional method, and provides a new and effective way for the healthy breeding of the redfin snapper and the improvement of the breeding efficiency.

Description

Technical Field

[0001] This invention relates to the field of aquaculture and fish behavior regulation technology, and more specifically to a method for regulating the aggregation and mobility of redfin snapper through light and color parameters. Background Technology

[0002] Redfin snapper (Lutjanus erythropterus) is an important marine economic fish with high nutritional and economic value. In redfin snapper aquaculture, their aggregation and mobility significantly impact their growth, reproduction, and resilience. Good aggregation allows them to better utilize the reef ecosystem, obtaining more food and shelter; strong mobility helps them improve feeding efficiency, evade predators, and adapt to environmental changes.

[0003] However, in current red snapper farming, the differences between artificial and natural environments often lead to insufficient aggregation and movement of the fish, affecting farming efficiency and fish quality. Existing methods to improve red snapper's reef attraction and movement, such as the introduction of chemical attractants and improvement of the aquatic environment, suffer from high costs, inconsistent effectiveness, and potential pollution of water quality and fish. Therefore, there is an urgent need for an environmentally friendly, efficient, and economical method to improve red snapper aggregation and movement, thereby enhancing farming efficiency or ecological restoration.

[0004] Light, as a crucial environmental factor, influences fish behavior. Fish exhibit phototaxis or photophobia in response to varying light conditions, affecting their migration and distribution patterns in water. Therefore, the characteristics of light-induced responses are of significant value in studying fish ecological adaptation mechanisms. Light not only provides visual information to fish but also regulates their physiology and behavior by affecting their endocrine and nervous systems. Different light parameters (such as wavelength, light intensity, and photoperiod) have varying effects on fish behavior.

[0005] However, overall, there is relatively little research on the regulation of light and color parameters in redfin snapper, and there is a lack of systematic optimization schemes for light and color parameters and behavioral evaluation methods.

[0006] Therefore, how to develop a method and process for regulating fish aggregation and mobility through light color, as well as a method for evaluating fish aggregation and mobility, are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a method for adjusting the aggregation degree and mobility of redfin snapper by means of light color parameters, so as to overcome the shortcomings of the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for adjusting the aggregation and mobility of redfin snapper using light color parameters includes the following steps:

[0010] (1) Construct a monitoring system for light and color regulation behavior;

[0011] (2) Conduct light and color regulation behavior monitoring experiments on fish at different growth stages;

[0012] (3) Calculate and analyze the aggregation degree and mobility of redfin snapper;

[0013] (4) Determine the appropriate light and color indices for different growth stages;

[0014] (5) Propose light and color adjustment methods suitable for different growth stages.

[0015] Furthermore, the above step (1) is as follows: the behavior monitoring pool is a square structure with a square base area. The experimental seawater is treated by flowing sand filtration before use. The aquaculture water is replaced before each experiment. During the experiment, the water salinity, pH and dissolved oxygen index are monitored in real time to ensure the safety of the experimental environment. A habitat enrichment structure is placed in the pool. The distance between the enrichment structure and the pool wall is greater than or equal to three times the size of the enrichment structure. The water depth of the pool is greater than or equal to twice the size of the enrichment structure.

[0016] The light color adjustment device is located above the behavior monitoring pool and consists of an LED light source, a light color controller, and a light sensor. The LED light source can emit light of different wavelengths, intensities, and light cycles. During the experiment, the light colors were set to white, green, red, blue, and yellow. The wavelength range was 400-700nm, the intensity range was 10-1000 lux, and the cycle range was 8L:16D-16L:8D. The light color controller was used to control the light color characteristics of the LED light source. The light sensor was used to monitor the light intensity and light color parameters in the aquaculture environment in real time. The light color, intensity, and cycle remained constant during each experiment.

[0017] Furthermore, step (2) above is as follows: before the experiment, turn on the lights and randomly select 15 red snapper to be placed in the behavior monitoring pool for 30 minutes to adapt to avoid stress caused by environmental changes, and then conduct a light color adjustment experiment; install a high-definition camera in the center of the breeding pool to cover the entire breeding area to ensure that the behavior patterns of red snapper can be fully monitored; use behavior analysis software to analyze video images, use the 1-hour interval frame interception method to record the daytime distribution characteristics of experimental fish, the total number of monitoring times is m, and select video clips per minute to track the movement trajectory of 5 individuals for analysis, and replace a new batch of fish after each experiment; set up a repeat experiment (3 days) to minimize the error caused by the external environment; do not feed during the experiment, turn off the flowing seawater, and stop oxygen supply.

[0018] Furthermore, in step (3) above, the aggregation degree is represented by two indicators: the population aggregation index and the spatial distribution uniformity. The aggregation index represents the degree of aggregation of fish and the stability of the population structure, while the spatial distribution uniformity is used to assess the uniformity of fish distribution in the aquaculture pond.

[0019] The swimming ability indicators are expressed as endurance swimming speed, sustained swimming speed, explosive swimming speed, coefficient of variation of swimming speed, and total swimming distance. Among them, endurance swimming speed, sustained swimming speed, and explosive swimming speed are defined by the continuous swimming time of the fish. Endurance swimming speed refers to the swimming movement of fish with a swimming time of 20 seconds to 60 minutes. The swimming speed in this stage is the endurance swimming speed. Sustained swimming is the swimming movement with a duration of more than 60 minutes. The explosive swimming speed is the maximum swimming speed that the fish can achieve. The coefficient of variation of swimming speed reflects the degree of difference in swimming speed among individuals in the group and is expressed as the ratio of the standard deviation of the speed of the five fish tracked in the total number of observations to the average speed. The total swimming distance is the total swimming distance of the fish during the observation period.

[0020] Furthermore, the above step (4) is as follows: the growth stages of fish are divided into juvenile stage (body length 5-15cm), adult stage (body length 15-30cm) and reproductive stage; according to different growth stages, light color regulation behavior monitoring experiments are carried out to determine the aggregation degree and movement ability indicators of fish under different light colors, light cycles and light intensities at different growth stages, and further determine the appropriate light color indicators for different growth stages according to different selection targets.

[0021] Preferably, when the light cycle is 12L:12D, and the aquaculture environment is designed to achieve a high degree of aggregation, the optimal light color for juvenile redfin snapper is blue light.

[0022] Furthermore, step (5) above specifically involves: the light sensor monitoring the light intensity and color parameters in the aquaculture environment in real time and transmitting the data to the light color controller; the light color controller automatically adjusting the color, intensity, and illumination cycle of the LED light source based on preset suitable light color characteristic parameters and real-time monitoring data to ensure that the light color characteristics in the aquaculture environment are always within the optimal range for each growth stage of the red snapper; by optimizing the light color parameters, the group structure and behavior patterns of the red snapper are regulated, making them more evenly distributed in the aquaculture pond and reducing competition and conflict among individuals.

[0023] Preferably, when the light cycle is 12L:12D, red light and yellow light have a promoting effect on the movement ability of redfin snapper in the juvenile stage. Red light is used to enhance movement ability, yellow light is used to enhance the group coordination movement ability, and blue light and green light have an inhibitory effect on their movement.

[0024] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. This invention optimizes the aggregation and mobility of redfin snapper by adjusting light color parameters (wavelength, color temperature, light intensity and period, etc.) and establishes a quantitative evaluation system, which is applicable to marine ranch resource management, aquaculture optimization and ecological restoration.

[0026] 2. This invention provides an environmentally friendly, efficient, and economical method. By studying the influence mechanism of different light color parameters (wavelength, color temperature, light intensity, and period, etc.) on the behavior of red snapper, it precisely controls the light conditions to stimulate the visual, endocrine, and nervous systems of red snapper, effectively improving their aggregation and mobility. This solves the problems of high cost, unstable effects, and pollution associated with existing methods for improving the reef attraction and mobility of red snapper, optimizes the red snapper farming process, improves farming efficiency, and enhances fish quality. At the same time, it provides a new technical approach for the ecological restoration of red snapper, achieving a win-win situation for both economic and ecological benefits.

[0027] 3. This invention, by installing a light color adjustment device in the red snapper farming environment, precisely adjusts the wavelength, intensity, and light cycle of the light to meet the light color requirements of the red snapper at different growth stages, effectively regulating the aggregation and movement ability of the red snapper. This method has advantages such as being environmentally friendly, efficient, economical, and easy to operate, avoiding the pollution and cost problems caused by the use of chemical agents in traditional methods, and providing a new and effective way to promote the healthy farming of red snapper and improve farming efficiency. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating a method for adjusting the aggregation and mobility of redfin snapper using light color parameters.

[0029] Figure 2 This is a zoning diagram of the bottom surface of the experimental water tank;

[0030] Figure 3 This is a diagram of the enrichment structure of the bottom surface of the experimental water tank;

[0031] Figure 4 The average distribution rate of redfin snapper in each zone under different light color conditions. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] A method for regulating the aggregation and mobility of redfin snapper using light color parameters was employed. The study used juvenile redfin snapper (6.00±0.46cm in length, 1.97±0.34cm in height, and 4.71±0.42g in weight) as the research subjects. Four hundred redfin snapper were selected. Figure 1 As shown, the specific steps include:

[0035] (1) Construct a monitoring system for light and color regulation behavior

[0036] Juvenile redfin snapper were temporarily housed in a monitoring pond. During the rearing period, the water temperature was 23.7±2℃, salinity was 32.5±0.8‰, pH was 8.19±0.08, and dissolved oxygen was 7.11±0.3 mg / L. The monitoring pond was aerated 24 hours a day, and the redfin snapper were artificially fed twice a day, at 9:00 and 17:00 until they were satiated. The experimental fish were acclimatized to these conditions for one week, and feeding was stopped 24 hours before the start of the experiment.

[0037] The experimental water tank is a square tank with a blue background, measuring 210cm×210cm×100cm, and has a water depth of 90cm.

[0038] The artificial reef measures 30cm × 30cm × 30cm (length × width × height). Based on the invention patent application No. 202410150124.1, entitled "Optimal Method for Artificial Reefs for Juvenile Redfin Snapper Based on Behavioral Characteristics," a reef with a circular opening diameter twice the height of the fish was selected as the enrichment structure. The reef was placed in the center of zone VI of the experimental pool. Figure 2 The opening diameter of the artificial reef is 4cm. Figure 3 ).

[0039] Based on the differences in light color, six experimental groups were set up: blue light (B, λ) 450nm ,201 lux), yellow light (Y, λ) 585-590nm ,202 lux), red light (R, λ) 640nm ,198 lux), green light (G, λ) 510nm ,199 lux), white light group (W, λ) 400-780nm The experiment used two light groups: a 10W LED group (206 lux) and a natural light group (S, where the light intensity varied over time each day). Each LED was 10W, the light source was 15cm above the water surface, the illumination period was set to 12L:12D, and the light intensity was set to 100 lux. The experimental pool was completely shielded with a blackout cloth during the experiment. After the experiment started, the light color sensor was turned on to monitor the light intensity and light color parameters in real time.

[0040] (2) Conducting experiments to monitor the light-color regulation behavior of fish at different growth stages.

[0041] Before the experiment, the lights were turned on, and 15 redfin snapper were placed in the experimental tank for 30 minutes to acclimatize and avoid stress caused by environmental changes. The camera recorded footage from 8:00 to 18:00, using a high-definition camera (20 frames per second, 2592*1944 resolution) positioned directly above the experimental tank to monitor the entire tank. Each experiment was repeated three times.

[0042] (3) Calculate and analyze the aggregation degree and mobility of redfin snapper.

[0043] Based on behavioral data obtained from the light color regulation behavior monitoring experiment, the aggregation degree and mobility of redfin snapper were calculated and analyzed to further screen suitable light color parameters for redfin snapper in the juvenile stage.

[0044] Aggregation: When the lights were suddenly turned on, the light stimulus triggered a noticeable avoidance response in the juvenile redfin snapper, manifesting as large-scale group swimming. As time went on, the fish gradually adapted to the environment, their swimming became calmer, and their behavior became more stable. In this experiment, the observed behavior of the juvenile redfin snapper was divided into two types: close aggregation and dispersed swimming.

[0045] Closely clustered: When the light source is first turned on, there are no obstructions in the tank. The fish move as a whole towards the backlight. The experimental fish try to squeeze into the center of the group to shield each other. After a period of time, the fish form a neat line, face the same direction, and are spaced at roughly equal intervals throughout the tank.

[0046] Scattered swimming: As the duration of sunlight increases, the movement of fish slows down, becomes less directional, and is mainly characterized by individual swimming.

[0047] The behavior of redfin snapper differs under different light conditions. Under blue light, the fish swim at a slower speed, make fewer turns, and congregate noticeably, appearing generally "comfortable" and mainly moving around the artificial reef model. Under red light, the fish move at high speed and randomly, making more turns, appearing "anxious," searching for hiding places, and rarely moving around the edge of the tank. Under other light conditions, the distribution of the fish shows no obvious pattern, and they mainly move randomly.

[0048] In calculating the aggregation index, the bottom surface of the experimental pool must first be divided into sections, the shape of which is as follows: Figure 2 The pool is divided into six zones, with zone VI being the zone for placing enrichment structures, and the zones gradually moving away from the enrichment structures. Zone I is the pool wall zone. For the first time, this invention sets different aggregation coefficients for each zone based on the differences in distance from the enrichment structures in the six zones. The coefficients for zone VI are 0.6, zone V is 0.25, zone IV is 0.15, zone III is 0.1, zone II is 0.05, and zone I is -0.15.

[0049] The formula for calculating the clustering index M is M = 0.6N. VI +0.25N V +0.15N IV +0.1N III +0.05N II -0.15N I , where N j (N I N II N III N IV N V or N VI ) represents the fish body distribution per unit area within zone j (I, II, III, IV, V, VI), and its calculation formula is: n i S represents the number of individuals of the target fish species in a specific partition during the i-th observation, m is the total number of observations, and S j This represents the area of ​​partition j.

[0050] Table 1. Classification of Aggregation Index

[0051] P <-10 -10～0 0～10 10～20 >20 Hierarchical description low level medium to low level intermediate level Medium to high level High level

[0052] The formula for calculating the spatial distribution uniformity P is as follows: Where D j The average distribution rate of fish bodies within partition j is expressed as follows: Where n is the total number of fish in the behavior monitoring pool.

[0053] Table 2 Spatial Distribution Uniformity Grading

[0054] P <1 1～1.5 1.5～2 2～2.5 >2.5 Hierarchical description low level medium to low level intermediate level Medium to high level High level

[0055] The spatial distribution characteristics of juvenile redfin snapper differed significantly under different light color conditions (P<0.05). Figure 4 Under white light, the highest concentration was in zone VI (23.00%) and the lowest in zone II (12.67%), with a preference for this color distribution in the reef model area. Under blue light, the highest concentration was in zone VI (33.67%) and the lowest in zone II (8.17%), with a preference for this color distribution in the reef model area. Under green light, the highest concentration was in zone VI (29.83%) and the lowest in zone II (9.50%), with a preference for this color distribution in the reef model area. Under yellow light, the highest concentration was in zone I (25.50%) and the lowest in zone V (9.67%), with a preference for this color distribution in corner zone I. Under red light, the highest concentration was in zone IV (24.17%) and the lowest in zone II (10.17%), with a preference for this color distribution in corner zone IV of the tank.

[0056] Significant differences were observed in the regional distribution of redfin snapper among the various color treatment groups (P<0.05). The distribution density in zone VI was significantly higher than in other zones, at 26.37±11.50%. Zones IV and I had the next highest average distribution rates, at 18.87±11.25% and 17.07±11.60%, respectively. Zones II and III had the lowest average distribution rates, at 11.07±9.44% and 12.47±9.18%, respectively. The average distribution rate in each zone was in the order of VI > IV > I > V > III > II.

[0057] The population aggregation index and spatial distribution uniformity calculated according to the formula are shown in Table 3.

[0058] Table 3 Aggregation Evaluation

[0059]

[0060]

[0061] Table 3 shows that under yellow light, the aggregation index of red snapper is at a medium level, while the aggregation indices under white, blue, green, and red light are all at a medium-high level. The highest aggregation index is found under blue light (13.6885), followed by green light (12.7121). Spatial distribution evenness is at a medium-high level under blue and green light, and high under white, yellow, and red light. Based on evenness values, the differences among the five light color indices are relatively small. Therefore, with a photoperiod of 12L:12D, and when the culture environment does not achieve high aggregation, blue light is the most suitable light color for juvenile red snapper.

[0062] Table 4 shows the movement ability indicators of the redfin snapper under different light colors.

[0063] Table 4. Movement data of redfin snapper under different light colors

[0064]

[0065] Table 4 shows that in terms of burst swimming speed, red light has the highest value (22.49 cm / s) and blue light has the lowest (3.77 cm / s), with red light being approximately six times faster than blue light. This indicates that red light may significantly enhance the instantaneous burst power of fish. In terms of endurance swimming speed, red light (16.96 cm / s) > yellow light (10.71 cm / s) > white light (6.97 cm / s) > green light (4.51 cm / s) > blue light (1.96 cm / s), indicating that fish have stronger low-intensity movement ability under red and yellow light, while blue light is the weakest. In terms of sustained swimming speed, the trend is consistent with the endurance speed, with red light (12.47 cm / s) and yellow light (7.89 cm / s) significantly higher than other light colors, and blue light having the lowest (0.85 cm / s), suggesting that red and yellow light may be more suitable for fish to swim for extended periods.

[0066] In the analysis of the coefficient of variation of swimming speed, the coefficient of variation was the smallest under yellow light (0.15), indicating that the individual speed difference within the group was the smallest and the movement coordination was the best; the coefficient of variation was the largest under blue light (0.45), indicating significant speed differences between individuals, which may be related to the fact that blue light inhibits the uniformity of fish movement.

[0067] Of the total swimming distances, the longest was under red light (33.97m), followed by yellow light (18.73m) and white light (16.76m), while blue and green light were shorter (<15m). Combined with speed data, red light significantly increased the total exercise volume by improving speed and exercise duration.

[0068] The results showed that red light significantly improved the swimming ability of redfin snapper, with the highest swimming speed (endurance, sustained speed, and burst speed) and the longest total swimming distance. This suggests that red light may enhance swimming ability comprehensively by stimulating fish activity or metabolic levels. Yellow light showed the second-best performance, but exhibited the best group coordination, with speed indicators second only to red light, and the lowest coefficient of variation, making it suitable for scenarios requiring synchronized group movement (such as aquaculture management). Blue and green light inhibited swimming ability, resulting in lower speeds and total distances. Blue light also increased speed differences between individuals, possibly related to the influence of light wavelength on fish visual perception or physiological state.

[0069] (4) Determine the appropriate light and color indices for different growth stages

[0070] When the light cycle is 12L:12D, and the aquaculture environment is designed to achieve a high degree of aggregation, the optimal light color for juvenile redfin snapper is blue light.

[0071] When the light cycle is 12L:12D, red and yellow light promote the movement ability of redfin snapper in the juvenile stage. Red light is more suitable for enhancing movement, while yellow light is more conducive to group coordination. Blue and green light may inhibit their movement.

[0072] (5) Propose light and color adjustment methods suitable for different growth stages

[0073] In actual breeding processes, suitable light and color conditions need to be determined according to needs.

[0074] In summary, this invention provides an example illustrating the light and color regulation behavior of juvenile redfin snapper (6cm in body length) under enrichment conditions, and proposes a method to optimize the aggregation and mobility of redfin snapper by changing light and color parameters. However, this invention is not limited to the described embodiment. Those skilled in the art can make equivalent modifications and substitutions in terms of growth stage, fish species, enrichment structure, light and color parameters, light intensity, and light cycle without departing from the spirit of this invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for adjusting the aggregation and mobility of redfin snapper using light color parameters, characterized in that, Specifically, the following steps are included: (1) Construct a monitoring system for light and color regulation behavior The behavior monitoring pool is a square structure with a square base area. The experimental seawater is treated by flowing sand filtration before use, and the aquaculture water is replaced before each experiment. During the experiment, the salinity, pH, and dissolved oxygen levels of the water are monitored in real time. Habitat enrichment structures are placed in the pool. The light and color adjustment device is set above the behavior monitoring pool and consists of an LED light source, a light and color controller, and a light sensor. The LED light source can emit light of different wavelengths, intensities, and light cycles. The light and color controller is used to control the light and color characteristics of the LED light source, and the light sensor is used to monitor the light intensity and light and color parameters in the aquaculture environment in real time. The light and color, light intensity, and light cycle remain constant in each experimental group. The distance between the enrichment structure and the pool wall is greater than or equal to three times the size of the enrichment structure, and the water storage depth of the pool is greater than or equal to twice the size of the enrichment structure. The experimental process used white, green, red, blue, and yellow light. The wavelength range was 400-700nm, the intensity range was 10-1000 lux, and the period range was 8L:16D-16L:8D. (2) Conducting experiments to monitor the light-color regulation behavior of fish at different growth stages. Before the experiment, the lights were turned on, and redfin snapper were randomly selected and placed in the behavior monitoring pool to adapt before the light color adjustment experiment was conducted. A high-definition camera was installed in the center of the breeding pool to cover the entire breeding area. The video images were analyzed using behavior analysis software, and the daytime distribution characteristics of the experimental fish were recorded using the 1-hour interval frame interception method. The total number of monitoring times was m, and the movement trajectory of 5 individuals per minute of video clips was selected for analysis. After each experiment, a new batch of fish was replaced. The experiment was repeated, and no feeding was carried out during the experiment. The flow of seawater was turned off and the oxygen supply was stopped. Fifteen redfin snapper were randomly selected and placed in a behavior monitoring pool for 30 minutes to acclimatize before a light and color adjustment experiment was conducted. (3) Calculate and analyze the aggregation and mobility indices of redfin snapper. The aggregation degree is represented by two indicators: the population aggregation index and the spatial distribution uniformity. The athletic performance indicators are expressed as endurance swimming speed, sustained swimming speed, explosive swimming speed, swimming speed coefficient of variation, and total swimming distance. In the calculation of the population aggregation index, the bottom surface of the experimental pool is first divided into six zones. Zone VI is the zone where enrichment structures are placed, and the zones gradually move away from the enrichment structures. Zone I is the pool wall zone. Based on the difference in distance from the enrichment structures in the six zones, different aggregation coefficients are set for each zone: Zone VI coefficient is 0.6, Zone V coefficient is 0.25, Zone IV coefficient is 0.15, Zone III coefficient is 0.1, Zone II coefficient is 0.05, and Zone I coefficient is -0.

15. The formula for calculating the group aggregation index M is as follows: M =0.6 N VI +0.25 N V +0.15 N IV +0.1 N III +0.05 N II -0.15 N I ,in, N I , N II , N III , N IV , N V , N VI This represents the fish body distribution per unit area within zones I, II, III, IV, V, and VI, and its calculation formula is: , N j express j Distribution of fish per unit area within a zone n i Indicates the first i The number of individuals of the target fish species in a specific zone during this observation, where m is the total number of observations. S j express j The area of ​​the partition; Spatial distribution uniformity P The calculation formula is ,in D j express j The average distribution rate of fish within a zone is expressed as follows: ,in n The total number of fish in the behavior monitoring pool; (4) Determine the appropriate light and color indices for different growth stages Based on different growth stages, light color regulation behavior monitoring experiments were carried out to determine the aggregation degree and motility indicators of fish under different light colors, light cycles and light intensities at different growth stages. Furthermore, based on different selection targets, suitable light color indicators for different growth stages were determined. (5) Propose light and color adjustment methods suitable for different growth stages By optimizing light and color parameters, the population structure and behavioral patterns of redfin snapper can be regulated.

Images