Outdoor intelligent hatching fish nest system for inducing natural reproduction behavior of demersal egg-protecting fishes

Abstract

The invention discloses an outdoor intelligent hatching fish nest system for inducing natural breeding behaviors of demersal egg-protecting fishes, which is characterized in that an inverted U-shaped main body is assembled by water corrosion resistant pipes (different demersal egg-protecting fishes select different pipe diameters, and odontobutis obscura select the pipe diameter of 160mm), the pipe openings face downwards, and according to the thermodynamic principle of water, hot water faces upwards, cold water faces downwards, and the water corrosion resistant pipes face downwards; energy (water temperature) in a fish nest system can be kept, and the pipe orifice is downward, so that the influence of wind and flow on the water temperature in the fish nest is reduced; the intensity of light entering the inverted-U-shaped bionic cave is reduced due to the fact that a pipe opening faces downwards, and an egg protecting environment with biological adaptability is built; the heat loss is effectively reduced by designing and combining the polyurethane thermal insulation layer; the 50mm multifunctional integrated pipe realizes integration of micro-flowing water, constant-temperature heating, oxygenation and waste gas emission; the inner wall is roughened by the electric steel wire brush to improve the roe attachment rate. The fish nest is suitable for habitats such as outdoor ponds and indoor water bodies which cannot preserve heat, incubation water temperature of 22-26 DEG C can be stably maintained through continuous injection of warm water or constant-temperature heating, and the fish nest is easy and convenient to operate and low in cost.

Description

Technical Field

[0001] The present invention belongs to the field of aquaculture engineering, and specifically relates to an outdoor intelligent fish hatching nest system for inducing the natural reproductive behavior of benthic egg-guarding fish. In particular, the present invention relates to a hatching system based on the principle of environmental bionics, which combines physical structure design with microenvironmental regulation to achieve the induction of the natural egg-guarding behavior of benthic egg-guarding fish such as sand snakehead (Odontobutis obscura) and goby (Gobiidae). Background Art

[0002] Existing hatching technologies have three major technical bottlenecks: poor environmental adaptability. When the water temperature in traditional tile and bamboo fish nests (such as CN201820123456.X) drops from 20°C to 10°C, embryonic development stagnates at the gastrula stage and eventually all die (Qian Hongjuan et al., 2008, Effect of Temperature on the Hatching of Fertilized Eggs of Sand Snakehead, Freshwater Fisheries, 38(2), 28-31). Traditional pond hatching methods have the following drawbacks: natural water temperature is greatly affected by the environment, the temperature difference between day and night leads to unstable hatching rates, and extreme weather (such as cold waves and heavy rains) can easily cause the death of a large number of fish eggs.

[0003] Lack of behavioral simulation. The indoor circulating water system (CN110447516A) cannot provide the caving effect and tactile stimulation required by male fish to protect their eggs. The downward-pointing design of the present invention reduces the intensity of light entering the inverted U-shaped bionic cave, creating a biologically adaptable egg-protecting environment. The inner wall of the tube is machined to form an egg attachment surface with an Ra ≥ 12.5μm, creating tactile stimulation similar to a natural environment.

[0004] Excessive energy consumption. The energy consumption per unit of water in a constant temperature incubation tank must be ≥ 8.6 kWh / m³·day (Ministry of Agriculture and Rural Affairs 2022 Aquaculture Energy Consumption Report). Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, an outdoor intelligent hatching fish nest system was invented to induce the natural breeding behavior of benthic egg-guarding fish.

[0006] The purpose of the present invention is achieved through the following technical solutions: an outdoor intelligent hatching fish nest system for inducing the natural reproductive behavior of benthic fishes that protect eggs. Taking the sand snakehead as an example, as shown in the figure, the system includes:

[0007] Bionic cave module: According to the size of benthic egg-protecting fish, the appropriate pipe diameter is selected. For sand snakehead, 160mm water-resistant corrosion-resistant pipe is selected. An inverted U-shaped structure is constructed by a 160×50mm tee joint (101), two 160mm four-way joints (102), two sections of 30mm connecting tees and four-way universal straight pipes (103), six sections of 300mm straight pipes (104), and six 90° right-angle elbows (105). This bionic cave has a biological induction function. According to the thermodynamic principle of water, hot water flows upward and cold water flows downward, which is beneficial to maintaining energy (water temperature) in the fish nest system. The downward pipe mouth reduces the impact of wind and flow on the water temperature in the fish nest; the downward pipe mouth reduces the intensity of light entering the inverted U-shaped bionic cave, creating a biologically adaptable egg-protecting environment. The inner wall is roughened with an electric wire brush. The inner wall of the pipe is treated with the electric wire brush to form an egg attachment surface with Ra ≥ 12.5μm, creating a tactile stimulation similar to a natural environment.

[0008] Environmental control module: The environmental control module integrated into the 50mm branch pipe (201) and the 160×50mm tee (101) includes three parts: a micro-flow water injection system; a temperature control heating system (set value 24±1°C). Sand mullet is an important freshwater economic fish in my country. Its reproductive biological characteristics show that the optimal incubation temperature is 18-~25°C (Wang Wu et al., 2006, Fish Culture Science, China Agriculture Press); and a microporous aeration system (pore size 0.1-~0.3mm). The 50mm multifunctional vertical integrated pipe is used for warm water (22-~26°C) or normal temperature water injection (water inlet pipe 202), temperature control heating (heating rod 203 and wire 204), microporous aeration (bubble stone 205 and aeration pipe 206) and exhaust gas discharge. The operation is simplified, and a single pipe realizes the four functions of water flow, aeration, temperature control heating and exhaust. Insert the air stone, heating rod and water inlet pipe into the 160×50mm tee at the bottom through the 50mm pipe.

[0009] Insulation and hoisting module: When the 50mm pipe is inserted into the bottom 160×50mm tee, the joint is coated with special glue for pipes and then assembled. After assembly, the joint between the outer pipe and the 50mm pipe is further reinforced with reinforcing glue to ensure the firmness of the hoisting system. 2 plastic ropes of 1.5m are folded in half and tied with a cow knot. The rope is placed 15mm below the 50mm diameter straight pipe opening and tightened. 4 plastic ropes are drawn and fixed with 50mm straight pipe clamps (301) 10mm below the 50mm diameter straight pipe opening. The 4 plastic ropes are evenly arranged. When pulling up, each pipe opening is kept horizontal. 50mm plastic ropes are reserved to facilitate the hanging of the fish nest on the steel wire rope across the pond. The polyurethane foam material is sprayed on site with a thickness of ≥20mm. The surface is trimmed after solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 : Schematic diagram of the three-dimensional structure of the bionic cave module and the environmental control module;

[0011] Figure 2 : Schematic diagram of the bionic cave module and the environmental control module (plan view) (with the connection relationship of each component marked);

[0012] Figure 3 : Schematic diagram of the bionic cave module and the environmental control module (side view) Figure 1 , including the schematic diagram of the clamping position) (marking the connection relationship between each component);

[0013] Figure 4 : Schematic diagram of the bionic cave module and the environmental control module (side view) Figure 2 , including the schematic diagram of hoisting and polyurethane insulation layer) (marking the connection relationship of each component);

[0014] Figure 5 : Schematic diagram of the thickness of polyurethane insulation layer;

[0015] Figure 6 : Cross-section of the environmental control module (overall);

[0016] Figure 7 : Cross-sectional view of the environmental control module (a multifunctional integrated module with a 160×50mm T-joint connected to a 50mm straight tube) (showing the layout of microstreaming water injection, temperature-controlled heating, microporous oxygenation, and the water and air flow paths).

Claims

1. An outdoor intelligent hatching fish nest system for inducing the natural reproductive behavior of benthic egg-guarding fish, characterized in that: include: A. The biomimetic inverted U-shaped cave, with biological adaptability, is assembled from water-resistant, corrosion-resistant tubing, with the tube opening facing downward. The inner wall of the tube is machined to form an egg attachment surface with a Ra ≥ 12.5 μm. B. The vertical branch of the inverted U-shaped cave integrates a water injection unit, a water temperature control unit, and a microporous aeration unit. The multi-parameter control device integrated into the vertical branch includes a water injection unit, a water temperature control unit (set at 24 ± 1°C), and a microporous aeration unit.

2. The system according to claim 1, wherein The bionic cave is constructed of water-resistant, corrosion-resistant pipes assembled through tees, crosses, and 90° elbows. The exterior is coated with a 20- to 30-mm thick closed-cell polyurethane insulation layer (closed-cell ratio ≥ 90%) with a density of 35- to 45-kg / m³. (Different pipe diameters are used for different benthic egg-protecting fish species; 160mm diameter is used for sand snakehead. For example, the inverted U-shaped main body for sand snakehead hatching includes: two 160mm crosses, one 160×50mm tee, six 90° right-angle elbows, six 300mm straight pipe sections, two 30mm straight pipe sections connecting the tees and crosses, one 50mm diameter straight pipe (100mm), and one 50mm straight pipe clamp.

3. The system according to claim 1, wherein: The water flow and water temperature control unit includes: a water pipe for warm water injection and a valve for controlling the flow rate; a constant temperature heating rod (power 50-~100W) and a temperature control switch.

4. The system according to claim 1, wherein: The vertical branch pipe (multifunctional integrated pipe) is connected to the warm water pipeline (water temperature 22-~26°C or room temperature water), the constant temperature heating device and the microporous oxygenation device, and also has the function of an exhaust hole.

5. The system according to claim 1, wherein: The horizontal pipe section, vertical pipe section and right-angle bend pipe section are covered with a polyurethane insulation layer with a closed porosity rate of ≥90%.

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