JPS5945330B2 - How to store sardines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for housing sardines in a culture water area such as a fish cage or an aquarium.

Generally, sardines are weak and sensitive fish that become extremely agitated by external stimuli such as handling by humans, and tend to swim disorderly in groups.

When these sardines are put into the batch section to be stored in a culture tank as shown in Figures 1 and 2, for example, the sardines have the property of rising to the surface of the water and swimming at the top when they are agitated. Because sardines gather and swim in narrow bodies of water,
Violent contact can cause fatigue, peeling of scales, and scratches.
As a result, the death rate increases.

In order to alleviate this kind of inconvenience to some extent, there is a method of lowering the water level of the tank below the batch section to create a wide water surface in which sardines are introduced, and then raising the water level to the inside of the batch section after waiting for the sardines to exhibit a stable swirling state. be.

However, this method is a little troublesome, and lowering the water level increases the initial density of sardines, and even with this method, the sardines tend to crowd near the water surface, causing fatigue due to contact with the sardines. Injuries and shedding of scales occur, and the mortality rate from this remains high.

The present inventors have conducted intensive research on a method for eliminating the cause of sardine death, which could not be avoided when conventionally storing sardines in a farming area, and were able to arrive at the present invention.

That is, in the present invention, when storing sardines in a culture water area, the inside of the culture water area is equipped with fluorescent lamps, mercury lamps, iodine light bulbs,
Alternatively, using an incandescent light bulb equipped with a filter that transmits light in the wavelength range of 380 to 550 nm, irradiate the water area in advance so that the amount of light energy received is at least the minimum amount of calming light, and the water area in this irradiated state. This invention relates to a method for housing sardines, which is characterized by housing sardines at a predetermined density.

According to the storage method of the present invention, even if the water level is raised to a narrow batch area and sardines are thrown in, the sardines will not be disturbed.
The sardines immediately dive deep under the surface of the water, and the sardines are introduced one after another without any confusion, and the sardines move in stable circles throughout the entire water area without causing fatigue, damage, or shedding of scales due to heavy contact. This will prevent the death rate from increasing due to confusion during containment.

By continuing this irradiation, the occurrence and continuation of confusion due to agitation of the sardines during the farming period can be avoided, and satisfactory sardine farming with a low mortality rate can be achieved.

The present invention will be explained in detail below.

The minimum sedating light amount in the present invention is the lowest light amount that allows sardines to maintain a stable turning swimming state, and is usually 11
00er/c roughness/groove π level, 300e rg/C
Irradiation beyond the AN-groove 'yt is preferable because it shows a more significant effect.

The light source used to carry out the present invention is preferably a fluorescent lamp (hereinafter abbreviated as a fluorescent lamp), a mercury lamp, or an iodine lamp, or an incandescent lamp equipped with a filter that transmits light in the wavelength range of 380 to 550 nm. (hereinafter abbreviated as incandescent lamp with letter) can also be used.

Furthermore, each of these light sources can be used in combination,
It can also be used in conjunction with conventional incandescent light bulbs.

The above-mentioned fluorescent lamp is a type of low-pressure discharge lamp containing mercury vapor, and has a structure in which a fluorescent substance excited by the line spectrum of mercury emits visible light.

Fluorescent lamps can be broadly classified into hot cathode preheating type fluorescent lamps, slim line type fluorescent lamps, cold cathode type fluorescent lamps, and special fluorescent lamps, but those that emit a large amount of light in the visible region are preferred.

The above-mentioned mercury lamps include low-pressure mercury lamps, high-pressure mercury lamps, and ultra-high-pressure mercury lamps, but those that emit a large amount of light in the visible region are preferred, and in the practice of the present invention, fluorescent high-pressure mercury lamps are particularly preferred.

The above-mentioned filter may be of any type as long as it transmits light with a wavelength of 380 to 550 nm well and absorbs light with a wavelength of 550 nm or more. Commercially available filters include color temperature conversion filters for photography. Alternatively, there is a color filter.

The light irradiation method in the present invention may be any method, and the light source may be placed in the water of the aquarium or fish tank in which sardines are cultivated, and the light source may be lit, or the light source may be placed above the water surface and lit. Good too.

Observation of the behavior of sardines in the culture tank revealed that they tend to become frightened and move around violently in the presence of darkness.

Therefore, it is preferable to illuminate the water area almost uniformly so as not to cause localized or uneven darkness within the water area.

Further, since sardines exhibit positive running properties, the light source used is preferably placed approximately on the center line inside the culture tank or water body.

Furthermore, it is also possible to arrange the light sources evenly around the inside of the tank, or to use them together with a light source on the center line.

Sardines to which the present invention can be applied are generally referred to as sardines, and include those belonging to the Ancholine family, such as the Japanese sardine, the Ancholine family, such as the Japanese anchovy and Formosan sardine, and the Herring family, such as the Japanese sardine. It has a remarkable effect on family fish.

The method of the invention is particularly suitable for highly densely packed fish tanks.
The effect is remarkable.

Preferred packing densities are 10-40 K97 m3, particularly preferably in the range 15-30 KP//77+3.

A typical example of such a high-density storage tank is the Spanish eel fish tank used in bonito pole-and-line fishing boats.

Preferred fields in which the present invention can be used include, in addition to the above, vessels for transporting sardines, and sardine storage cages or tanks at sea or on land.

Even in these fields, the effects of the present invention are particularly large in the case of high-density accommodation.

As described above, the present invention works on the physiology and ecology of sardines and has the effect of keeping them in a resting state, and is extremely effective in preventing death due to agitation of sardines induced by containment work. do.

In particular, by applying the present invention to sardines used as active parts for bonito pole-and-line fishing, it is possible to suppress the turbulence when loading the sardines into the inboard aquarium, and to prevent death due to this.

Further, the effects of the present invention are extremely effective when the sardines are subjected to great stress, for example, when attempting to farm them at high density, or when storing them in aquarium water with a large temperature difference from the open sea.

Furthermore, according to the present invention, since the sardines quickly dive into the tank, the water level in the tank can be maintained at a steady state (normally in the middle of the batch section) while the sardines are housed, which greatly reduces the work involved in storing the sardines. It becomes simple and convenient.

Hereinafter, the effects of the present invention will be shown by Examples and Comparative Examples.
Schematic sectional views of the culture tank used for this purpose are shown in Figures 1 and 2.

In the figure, 1 is a reflector light lamp, 2 is a fluorescent lamp fixed support, 3 is a batch part, 4 is an aquarium container, 5 is a mercury lamp fixed support part, 6 is a mercury lamp (with cover), 7 is a fixed mercury lamp 8 is a mercury lamp fixing support part.

Examples 1 to 4 and Comparative Examples 1 to 2 Anchovies with an average weight of 517 fish, which had been kept in a cage in the sea for about 5 days after being caught by fixed net fishing, were gathered together with a net and collected together with seawater to a volume of about 151 fish (about 5.3K97 cups). Scoop the sardines into a bucket (which contains sardines), and make a
Volume 3.3 m3 (1,
They were gently released into a rectangular aquarium measuring 5 m x 1.5 m x 1.5 m), and this process was repeated until 80 to 9 sardines were housed.

At this time, the type and position of the light source used and the position of the water surface were varied, and as shown in Table 1, Examples 1 to 4 and Comparative Examples 1 to
Two conditions were set.

The minimum amount of received light energy at that time is also shown in Table 1.

The results for each side were as shown in Table 2.

Example 5 and Comparative Example 3 410 anchovies with an average weight of 4 g/tail, which were kept in a cage in seawater for one week after being caught by fixed net fishing, were fed to 410 anchovies, and 430 ton class bonito were harvested in the same manner as in Examples 1 to 4. Fishing boat bait sardine storage tank (capacity approx. 2377Z3, batch section lmX1
m x 0.8 m height) (see Figure 2)
Two 40W fluorescent mercury lamps were hung and turned on, and the batch was placed in a water tank whose water level was maintained at about 50 m below the lower end.

The accommodation density was 18 K9/rft3 (Example 5)
.

In Comparative Example 3, an experiment was conducted in the same manner as in Example 5 using two 60W incandescent lamps and using another tank.

The results are shown in Table 3.

[Brief explanation of drawings]

FIGS. 1 and 2 are vertical sectional views showing an example of a water tank for carrying out the method of the present invention.

Claims (1)

[Scope of Claims] 1. When storing sardines in a culture water area, the culture water area may be illuminated with a fluorescent lamp, a mercury lamp, an iodine lamp, or a 380~
Using an incandescent light bulb equipped with a filter that transmits light in the wavelength range of 550 nm, irradiate the water area in advance so that the amount of received light energy is at least the minimum amount of calming light, and then apply light to the irradiated water area. A method for housing sardines, characterized by housing sardines at a predetermined density. 2 The amount of received light energy is 300erg/(24-711
The method according to claim 1, wherein the number of particles is 1n or more. 3 The storage density of sardines in the farming area has increased from 10 to 40 2/
A method according to claim 1, wherein the method is rrL3.