JPH0364091B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for preventing or inducing fish to swim and escape in seawater when culturing fish.

(Prior Art) Generally, when cultivating fish, a cage is set up in seawater and the fish are cultured within the cage. Usually, a net is stretched around the seawater to form a cage, and the net prevents fish from escaping to the outside of the cage or from entering the inside of the cage.

(Problem to be Solved by the Invention) However, if a fish cage is formed using a net, the net may be damaged in areas with strong currents or strong waves due to a typhoon, and the fish may escape.
In addition, seaweeds grow in the nets, inhibiting the replacement of seawater and causing fish diseases. Therefore, a great deal of effort and cost is required to maintain and maintain the network.

The problem to be solved by the present invention is to solve these conventional problems and drawbacks, and to
To provide a method for preventing fish from escaping, which can be used even when waves are high, can be cultured under conditions close to nature without inducing fish diseases, and is inexpensive, easy to maintain, and low in cost.

(Means for Solving the Problems) The gist of the present invention that solves the problems is as follows: (1) Stimulation that applies electricity, sound, vibration, etc. to the fish body by sensing magnetism on the outside or inside of the fish body to be prevented from escaping. A generator is attached, and an electromagnetic induction cable or a cable attached with a permanent magnet that generates magnetism is laid at the seawater border to prevent fish from escaping, and when the electromagnetic induction cable or permanent magnet is approached, the stimulation generator is generated by the magnetism. A method for preventing the escape of fish, characterized in that the fish are prevented from moving beyond the seawater boundary by stimulating the fish body (2) A magnetic field of that frequency is generated by passing an alternating current of 6 to 10 KHz through an electromagnetic induction cable (3) The method for preventing fish from escaping according to claim 1, wherein a magnetic region is formed at the seawater boundary (3) The method for preventing fish from escaping according to claim 1, wherein a magnetic region is formed at the seawater boundary by a cable attached with a permanent magnet (4) A stimulator is installed on the outside or inside of the fish body to prevent fish from escaping, and a stimulator is attached to the fish body to stimulate the fish body with electricity, sound, vibration, etc., and an ultrasonic generator that generates ultrasonic waves at the seawater border to prevent fish from escaping. A method for controlling fish, characterized in that when a fish is brought close to the ultrasonic generator, the stimulation generator stimulates the fish body with the ultrasonic waves, thereby preventing the fish from moving beyond the seawater boundary. Escape prevention method (5) Attach a timer-activated stimulus generator that applies electricity, sound, vibration, etc. to the fish body at a set time on the outside or inside of the fish body to prevent escape. A method for preventing fish from escaping (6) characterized by applying stimuli such as sound and vibrations and using the stimuli as a conditioned reflex to cause the fish to return to a predetermined place such as a feeding place so as to prevent them from escaping to a distant place. 6. A method for preventing escape of fish according to any one of claims 1 to 5, wherein the stimulus generator is housed in a non-digestible microcapsule and is swallowed by the fish body and retained in the digestive system for a long time.

The means for generating stimulation by the stimulation generator include electrodes, piezoelectric vibrators, electrostrictive vibrators, magnetostrictive vibrators, etc., and as the power source, micro-sized batteries and seawater batteries can be used.

(Example) Examples will be described below based on the drawings.

First Embodiment (Refer to Figures 1 to 5) In the embodiment shown in Figures 1 to 5, fence stakes 2 are erected on the seabed at seawater boundary 1 to prevent escape, and
An electromagnetic induction cable 3 that generates an alternating current of 9.8KHz is strung. The stimulation generator 4 includes a magnetic sensor 5, an amplification circuit 6, a voltage application circuit 7, and electrodes 8, 9.
This is an example in which the microcapsule 11 consists of a microcapsule 11 made of non-digestible plastic, and only the electrodes 8 and 9 are exposed on the surface thereof.

This microcapsule 11 is swallowed and attached to the fish body 12. In this embodiment, when the fish approaches the seawater boundary, the magnetic sensor 5 senses the magnetism of the electromagnetic induction cable 3, the amplification circuit 6 amplifies it, and the voltage application circuit 7 applies voltage to the electrodes 8 and 9. Stimulates the lining of the digestive system within the fish body. The stimulation by the electrodes 8 and 9 becomes stronger as the fish approaches the seawater boundary, and fish do not approach or cross this seawater boundary.

Here, the same effect can be obtained by forming a magnetic region at the seawater boundary by using a cable to which a permanent magnet is attached instead of the electromagnetic induction cable 3.

Second embodiment (see Figures 6 to 8) In the second embodiment shown in Figures 6 to 8, the seawater boundary 1
A plurality of ultrasonic oscillators 20 are arranged for each fence pile 2 erected in the fence, and a region with strong ultrasonic waves is formed along the seawater boundary 1.

The stimulation generator 21 is fixed to the outside of the fish body 12 near the head with a stopper 28, and applies stimulation by inserting an electrode into the fish body and applying voltage. Circuit 23 and voltage application circuit 2
4, electrodes 25 and 26, and an ultra-small battery 27. In this embodiment as well, the ultrasonic waves become stronger as they approach the seawater boundary 1, which is detected by the ultrasonic sensor 22, amplified by the amplification circuit 23, and applied voltage to the electrodes 25 and 26 by the voltage application circuit 24. In this example, the fish body 12 is stimulated to prevent it from approaching or exceeding the seawater boundary 1.

Third Embodiment (See Figures 9 and 10) The third embodiment shown in Figures 9 and 10 is an example in which the timer 31 operates at feeding time to give a stimulus and guide the person to the feeding place by conditioned reflex. be. The stimulus generator 30 is attached to the outside of the fish body 12, similar to the second embodiment. In the figure, 32 and 33 are electrodes, 34 is an ultra-small battery, and 35 is a stopper.

(Effects of the invention) As described above, the invention does not require the use of nets, functions regardless of ocean conditions such as tides and waves, and weather conditions such as typhoons, and can be constructed at low cost. There is less occurrence of fish diseases that are unique to net farming, and fish farming can be carried out under conditions close to natural conditions.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the stretched state of the electromagnetic induction cable of the first embodiment, Fig. 2 is an explanatory diagram showing an example of a seawater boundary, Fig. 3 is an explanatory diagram showing the position where the stimulation generator is attached to the fish body, Figure 4 is a perspective view showing the stimulus generator;
Figure 6 is a block diagram showing the same circuit, Figure 6 is an explanatory diagram showing the state of ultrasonic wave generation in the second embodiment, Figure 7 is an explanatory diagram showing the state in which the stimulus generator is attached, and Figure 8 is the illustration of the stimulus generator. FIG. 9 is an explanatory diagram showing the state in which the stimulation generator of the third embodiment is installed, and FIG.
Figure 0 is a block diagram of the stimulus generator circuit. 1: seawater boundary, 2: fence stake, 3: electromagnetic induction cable, 4, 21, 30: stimulus generator, 5: magnetic sensor, 6, 23: amplification circuit, 7, 24: voltage application circuit, 8, 9 , 25, 26, 32, 33: electrode,
10, 27, 34: Ultra-small battery, 11: Microcapsule, 12: Fish body, 20: Ultrasonic oscillator, 2
2: Ultrasonic sensor, 31: Timer.

Claims (1)

[Claims] 1. A stimulation generator is attached to the outside or inside of the fish body that is to be prevented from escaping, and a stimulation generator that senses magnetism and provides stimulation such as electricity, sound, vibration, etc. An electromagnetic induction cable or a cable attached to a permanent magnet is laid, and when the electromagnetic induction cable or permanent magnet is brought close to the magnet, the stimulation generator stimulates the fish body, causing the fish to move beyond the seawater boundary. A method for preventing fish from escaping. 2. The method for preventing escape of fish according to claim 1, wherein an alternating current of 6 to 10 KHz is passed through the electromagnetic induction cable to form a magnetic field of that frequency at the seawater boundary. 3. The method for preventing fish from escaping according to claim 1, wherein a magnetic region is formed at the seawater boundary by a cable attached with a permanent magnet. 4 A stimulator is attached to the outside or inside of the fish body to prevent fish from escaping, and a stimulator that senses ultrasonic waves and stimulates the fish body with electricity, sound, vibration, etc., and an ultrasonic device that generates ultrasonic waves at the seawater border to prevent fish from escaping. Arrange the generator,
A method for preventing escape of fish, characterized in that when approaching the ultrasonic generator, the stimulation generator applies ultrasonic waves to stimulate the fish body, thereby preventing the fish from moving beyond the seawater boundary. 5 Attach a timer-activated stimulus generator that applies electrical, sound, vibration, etc. stimulation to the fish body at a set time on the outside or inside of the fish body to prevent escape. A method for preventing fish from escaping, characterized in that a stimulus is given and the conditioned reflex of the stimulus causes the fish to return to a predetermined place such as a feeding place, thereby preventing them from escaping to a distant place. 6. The method for preventing escape of fish according to any one of claims 1 to 5, wherein the stimulus generator is housed in a non-digestible microcapsule and is attached to the fish by swallowing it and retaining it in the digestive system for a long time.