JP2007161691A - Method for exterminating starfish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for simply exterminating acanthaster, which has slight possibility of being bitten by Acanthaster. <P>SOLUTION: The method for safely and simply exterminating starfish comprises injecting an ammonium salt to starfishes in the sea. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for controlling starfish in seawater.

Starfish inhabit the sea floor, use bivalves as a staple food, and inhibit the growth of sea bream and clams. The number of clams harvested in Japan has been decreasing year by year due to the damage of starfish, and there have been many reports of starfish being mixed in seedling containers that are cultivating scallops and abalone, etc.
Recently, due to various factors such as the rise in seawater temperature due to global warming, the reproduction of starfish has been further accelerated, the amount of starfish in the sea has increased, and the damage to shellfish due to starfish feeding damage has increased dramatically.

For example, when fishing is carried out by construction net fishing, only a few fish are required for the 200 m construction net, but 200 to 300 starfish are required. Because starfish are entangled in the net, a large amount of starfish must be removed from the net in order to fish the next time.
However, the starfish has hard spines on the surface, so if you try to remove the starfish forcibly, it will break the net. In construction net fishing, the trouble of net breaking and starfish removal work is a big problem.

  Accordingly, there has been a strong demand for the development of a disinfectant or a disinfecting method that can easily remove and remove starfish from fishing nets.

  As a result of studying the development of a large amount of starfish pesticide in building net fishing, the present inventor has dissolved ammonium salt on the ship and soaked or sprayed the starfish, or powdered ones on the surface of the starfish It has been found that it can be exterminated by coating (Patent Document 1). For the purpose of eliminating and removing starfish entangled in the net, when immersed in a solution in which a starfish repellent is dissolved, the starfish dies immediately after immersion, the arms fall apart, and the arm naturally disengages from the net.

However, the starfish that cause the most damage are starfishes with poisons such as the starfish that eats and corals the coral reefs in Okinawa. By eating and coral reefs, seaweeds and fish disappear, fish reefs disappear, and the environment is destroyed.
Many organisms live in coral reefs at high density, and various substances are circulated through metabolism and calcification. Among them, the circulation of carbon and nutrients is particularly important and may have been deeply involved in maintaining the ecosystem. In order to protect coral reefs, the removal of the starfish is an essential issue.

Under the present circumstances, in order to remove the starfish, the diver must dive and pierce the starfish with a spear and bring it to the sea many times. For this reason, people who are stabbed by a starfish appear every time they are exterminated, and there is an accident in which they are admitted to the hospital due to an anaflaky shock caused by the poison of the starfish. In this method, divers suspected of having decompression sickness are also generated, and the health of divers is seriously damaged.
In addition, it is a great work because it is necessary to exterminate the starfish on the land after piercing the starfish with a spear and raising it from the water to the land. In addition, disposal of starfish is expensive.
There is a strong need for divers to develop a method that is safe and easy to remove.
JP 2002-363015 A

  It is an object of the present invention to provide a method for combating a starfish in the sea.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventor has found that starfish can be exterminated by a method in which an ammonium salt is filled in a container and injected into a starfish in the sea.

That is, the present invention is as follows.
(1) A method of exterminating starfish by injecting ammonium salt into starfish in the sea.
(2) The method for controlling starfish according to (2), wherein the ammonium salt is at least one of ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium carbonate, ammonium formate, and ammonium acetate.
(3) The starfish extermination method according to (1) or (2), comprising a polymer compound.
(4) The starfish control method according to any one of (1) to (3), wherein the polymer compound is a natural polymer such as xanthan gum, pullulan, guar gum, gelatin, and pectin.

The present inventor has found that starfish caught on a net can be easily removed by immersing starfish in a solution in which an ammonium salt is dissolved. Since this method was a method of extermination on land or on a ship, it was not suitable for a method of exterminating starfish (especially oni starfish) inhabiting in the sea.
As a result of investigating a method for easily extermination in the sea, it was found that starfish can be exterminated by injecting a solution in which an ammonium salt is dissolved into the starfish in the sea.
It can be easily and efficiently removed by filling the container with the projections that can be injected with ammonium salt and piercing and injecting the starfish that divers dive and eat the coral reef.

The present invention relates to a method for controlling starfish in the sea.
The present invention is a method in which an ammonium salt such as ammonium chloride is dissolved and filled in a container provided with a projection to be injected, and the diver is submerged in the sea and injected into a starfish that eats and corals a coral reef.

  The container for injection | pouring should just be a container which can pierce a starfish and can inject | pour the ammonium salt solution in it. For example, it may be in the form of a syringe or a caulking gun.

  As an ammonium salt to be used, at least one of ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium carbonate, ammonium formate, and ammonium acetate is used. Considering environmental safety, it is preferable to use ammonium chloride / ammonium sulfate / ammonium carbonate, which is a highly safe food additive that has no use standard and can be used without limitation, and has good degradability.

  As the concentration of the ammonium salt, a liquid having a concentration of 1% or more is prepared and used. Preferably, it is used at a concentration of 10 to 60%.

  In order to give viscosity, a high molecular compound can also be dissolved and used. Making a product with viscosity can prevent outflow from a container in the sea, and can easily stay inside the starfish after being injected into the starfish, which is excellent economically and effectively. Because.

  Although all the high molecular compounds to be used can be used, natural polymers such as xanthan gum, pullulan, guar gum, gelatin, and pectin are preferably used. Especially, it can be said that the xanthan gum whose viscosity does not decrease even after long-term storage is most preferable.

 The concentration of the polymer compound in the drug is preferably 0.1 to 20%. This is because when the concentration is less than 0.1%, the viscosity is too small, and when it exceeds 20%, the viscosity is too high and the injection work becomes difficult.

  There is a big ony starfish of about 60 cm. In the case of a starfish with a size of about 30 cm, if 30% ammonium salt is injected, it can be killed by injecting 10 ml or more. As an injection method, an injection method from the upper anus is effective. Moreover, the method of inject | pouring into 3-4 places is also effective.

(Test 1)
The chemicals having the composition shown in Table 1 were prepared and filled into a caulking gun container to produce an injection container for starfish control. 40 ml of the drug was injected into a sea star that was submerged in the sea and was about 30 cm in size, and the presence or absence of death was confirmed.
The results are shown in Table 2.

According to the present invention, the starfish can be removed safely and effectively.

Claims (4)

A method to combat starfish by injecting ammonium salt into starfish in the sea. The method for controlling starfish according to claim 1, wherein the ammonium salt is at least one of ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium carbonate, ammonium formate, and ammonium acetate. 3. A method for controlling starfish according to claim 1 or 2, comprising a polymer compound. 4. The method for controlling starfish according to claim 1, wherein the polymer compound is a natural polymer such as xanthan gum, pullulan, guar gum, gelatin, and pectin.