JPH0426811B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is mainly aimed at small-sized rare species that are often caught with nets when loaded onto fishing boats or catch carriers at fishing grounds and returned to port one by one like large fish. Although it is difficult to stab the fish to death with a knife, allowing it to die naturally while being transported to a fishing port will result in a significant loss of freshness, so it is best to kill the fish taken onboard the ship as soon as possible. There is a need to preserve freshness while avoiding wasting physical strength, and by making it small and capable of catching many fish, it kills the fish immediately after it is caught alive and retains the same freshness as if it were shime-treated without being stabbed. This provides a method by which the fish can be transported to a fishing port, etc.

``Conventional technology'' Traditionally, in the case of high-grade or large-sized fish, a so-called shime treatment was applied to kill each fish with a knife immediately after capture to prevent deterioration of freshness, but for relatively small fish such as sardines, which are often caught with nets, In the case of fish, it is not worth the hassle to stab them to death one by one, so fill the fish hold with ice or seawater cooled by a cooler, put the fish that are still alive right after the catch, and immediately kill them with cold water. Although methods are used to kill the fish, some species do not die immediately even in cold water, but die after rampage and agony.
It has the disadvantage that it consumes a large amount of ATP (adenosine triphosphate), resulting in a decrease in freshness.

``Problem to be solved by the invention'' When fish continue to survive in the air for a long time after being caught, a large amount of ATP is consumed in the fish muscles, resulting in a decrease in freshness.To prevent this, large fish, high-quality fish, etc. The so-called shime treatment is performed by stabbing to death with a knife, but since it is difficult to stab small, prolific fish such as sardines to death one by one, it is recommended to use instant killing, which is equivalent to shime treatment, even for prolific fish. The purpose is to provide the means to do so.

"Means for Solving the Problem" In order to achieve the above object, in the present invention, by injecting and dissolving an inert fluid into cooling water, an oxygen-deficient state is created, and in the cooling water, a highly caught fish is kept alive. The system instantly kills the fish by adding water to the fish, and the muscles of the fish body are kept in the same state as when they were alive, without the production of unnecessary waste products, making it possible to maintain stable freshness.

"Effects similar to embodiments" In the present invention, a fish hold is filled with seawater, and an inert fluid such as carbon dioxide or nitrogen gas is blown into the blowing pipe inside the fish hold from a cylinder through a connecting pipe to dissolve it and cool the inside of the fish hold. The seawater is depleted of oxygen, and small, frequently caught fish, such as sardines, are thrown into it alive, killing the fish immediately and minimizing ATP consumption within the fish's muscles.
This prevents deterioration of freshness.

``Effects of the Invention'' The present invention can instantly kill fish that are caught in large quantities by depriving them of oxygen in the same manner as with shime treatment, thereby minimizing wastage due to writhing, preventing deterioration of freshness, and preserving freshness until unloading at a fishing port, etc. , which has the effect of maintaining quality until edible.

Claims (1)

[Claims] 1. Instant killing of fish, characterized by injecting and dissolving an inert fluid into cooled seawater or cooled brine in a fish hold, creating an oxygen-deficient state, and then throwing in a fish that is still alive and suffocating it to instant death. Method.