JP2001204396A - Feed raw material composed of semidried product and feed for fish breeding using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a feed for fish breeding, comprising a protein derived from krill as an active ingredient, causing excellent growth and survival, low in elution of its water-soluble nutrient when thrown into water. SOLUTION: This feed raw material for fish breeding comprises a semidried product in a state of substantially no gap between meat and shell of heated krill. The feed raw material for fish breeding comprises a formed material obtained by heating raw or frozen krill and forming the heated krill under pressure and/or under compression, making its volume to 95-25% volume in comparison with that in a non-pressurized state and adjusting water content to 15-60 wt.% and particle diameter to 1-30 mm and is preferably used as a frozen commodity. The feed for fish breeding uses the feed raw material for fish breeding. The feed can use further wheat flour, starch, water and oil The feed preferably contains 15-40 wt.% of water and preferably 5-30 wt.% of oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed material which is a semi-dried product obtained by heating raw or frozen krill and a feed for fish farming using the raw material.

[0002]

2. Description of the Related Art In the sea culture of fish, solid fish feed such as dry pellets is not fed depending on the fish species.
In many cases, live feed is still used. In order to feed raw or frozen fish in minced, cut and round shapes,
There are problems such as elution of water-soluble nutrients into seawater and dispersal in water, and there is a drawback that the predation rate of bait is low. In recent years, the number of fish species that can be cultivated on the sea surface has increased, and it has become a situation that cannot be said to be a high catch fish like sardines and mackerel,
There is a demand for a solid feed that is close to raw feed for marine aquaculture. Moist pellets close to raw bait are generally obtained by adding raw and frozen raw materials, a sizing agent such as carboxymethylcellulose, vitamins, minerals, and the like, and kneading and molding. This is characterized in that the dispersion of the bait in water is less than that of the raw bait, and that the necessary components can be added relatively freely. However, since the main raw material is raw material, the raw material price is not constant, the preservation in water is better than raw bait,
Even so, only about 50% is consumed, and the remainder is dispersed in water, the feed efficiency is poor, and the farmed fish has a unique moist pellet odor (sardine odor). In this way, pellets that are close to conventional raw food have low feed efficiency and cause marine pollution.Therefore, improvements are required, such as solid feed for marine aquaculture whose improvement is similar to raw feed. Realization is strongly desired.

[0003] In addition, cultivated fisheries in Japan have become increasingly important, and accordingly, the development of seed and seedling production has been remarkable, and various fish species have become possible. Conventionally, biological feeds such as rotifers and artemia have been used as feeds for producing seeds and seeds, but it has been found that this alone causes massive death due to nutritional deficiencies and the like. In order to solve this problem, research and development of particulate feed for seeds and seedlings were carried out at universities and companies, and the combined use of it and biological feeds has improved seed production technology. Conventional particulate feed is produced by a freeze-drying method or a fluidized-bed granulation method. The former manufacturing process is very laborious in kneading, freeze-drying, pulverizing, and classifying, and requires a great deal of cost because a freeze-dryer is used. In the latter case, the mixing of powders and fats is congested due to the property of combining and granulating the powder by diffusing the binder from the nozzle while stirring the powder with a fluidized bed granulator. . Also, the manufacturing cost is considerably high.

[0004] Conventionally, krill such as prawns and islets have been used as a sow bait. This krill,
In some cases, fresh and fresh ones are used, but in order to improve the preservability, krills in a non-heated state or heated krills are generally frozen and sold. Then, it was used by decompressing a necessary amount at the time of use. The thawing of frozen krill has been performed by natural thawing or forcedly by hot water decoction. Therefore, thawing takes a lot of time and labor, and is difficult to use easily. Furthermore, thawing takes a lot of time or a large amount of water comes out, so that the active ingredient of krill disappears or deteriorates, and the growth and survival effects are reduced. Frozen krill, when using heated krill, because the body of the krill shrinks when heated, air bubbles enter the gap between the body and the shell, even when using unheated krill,
Freezing or thawing can cause body moisture to flow out and also form air bubbles between the shell and the body. Depending on the fish species and growing season, fish farming feed requires an appropriate sedimentation rate or its regulation, but krill containing a lot of air bubbles has a low specific gravity, so when dropped into water,
It floated on the surface of the water or in shallow water, making it difficult to settle deeply in the water.

[0005]

SUMMARY OF THE INVENTION The present invention provides a water-soluble nutrient which is less eluted when dropped onto the surface of the water, such as sea bream, red sea bream, flounder, striped horse mackerel, and ayu.
It is an object of the present invention to provide a feed for fish farming which sediments at an appropriate speed, especially a feed for fish farming which can be suitably used as a bait feed for the larvae and juveniles, or a feed raw material for fish farming used in combination with other components. In addition, the present invention provides a krill-derived protein which is excellent in growth and survival and has little elution of water-soluble nutrients when put into water by using the fish feed ingredient of the present invention mixed with other components. An object of the present invention is to provide a feed for fish farming as a component, that is, a solid feed for fish farming that is excellent in feed efficiency, does not cause environmental pollution, and is soft and highly elastic, close to raw feed.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is a feed material for fish farming consisting of a semi-dried product having substantially no gap between the body and the shell of the heated krill. A raw or frozen krill is heated and formed from a molded product obtained by depressurizing and / or compressing the krill.
5%, the water content is 15 to 60% by weight, and the particle diameter is 1 to 30 mm.
Heat the raw or frozen krill, decompress it and / or
Alternatively, it is made of a compression-molded product, and has a volume of 95 to 25% and a water content of 15
It is a feed material for fish farming consisting of a semi-dried product having substantially no gap between the body and the shell of heated krill, having a particle size of 1 to 30 mm and a particle size of 1 to 30 mm. The feed material for fish farming of the present invention is preferably a frozen product.

[0007] Further, the present invention has a gist of a feed for fish farming using the raw material for fish feed consisting of the above semi-dried product. In addition, using flour, starch, moisture and oil,
In this case, the present invention is a feed for fish farming using the above-mentioned semi-dried fish feed raw material, flour, starch, water and oil. The above feed preferably has a water content of 15 to
In the range of 40% by weight, more preferably, the oil content is 5%.
-30% by weight.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A method for producing a feed material for fish farming of the present invention will be described. A heating step of heating and processing the raw or frozen krill, and compressing the heated krill obtained in this heating step, preferably to a volume of 95 to
It comprises a pressurizing step of 25% and a water content of 15 to 60% by weight, and a particle forming step of adjusting the krill that has passed through the pressing step to preferably a particle diameter of 1 to 30 mm. The heating step described above can use a heating step such as a boiling step for producing a boiled krill product or meal. When producing a small particle size or semi-dried product used as a raw material for fish farming, dry krill powder containing all the krill components consisting of a process of extracting sea water from caught krill, crushing and heating and drying it Method for manufacturing granules (PCT / JP / 0
5892) can be used. Further, the molded article may be one that has been frozen and stored after molding. That is, the raw material for fish farming or the sowed bait thus formed may be used or sold as it is, or may be stored frozen and thawed at the time of sale or use.

[0009] A method for producing a feed for fish farming of the present invention will be described. Moist pellets that are close to raw baits use the semi-dried fish feed raw material of the present invention in place of conventional raw and frozen raw materials such as sardines, anchovies and saury. Since it is a semi-dried product, it has better moisture return and is easier to handle than dried products such as fish meal. Add paste such as carboxymethylcellulose, vitamins, minerals, etc., knead,
Mold and make. Dispersion of the bait in water is less than that of raw bait, and preservation in water is excellent. More protein,
There is a feature that necessary components such as oil can be added relatively freely.

As a solid feed close to raw feed, for example, it can be used as a raw material for soft EP. In this case, the above-mentioned semi-dried feed material for fish farming of the present invention is used in place of all or a part of the commonly used fish meal. After adding fats and oils to the raw material for fish farming, water is added, and the mixture is heated and kneaded by a pressurizing and heating extruder to produce. In other words, almost the same raw materials as conventional fish feed can be used.
Proteins such as soybean oil cake, corn gluten meal,
Starch such as starch and wheat flour contains vitamins and minerals. It is manufactured by a method of drying after molding. Almost the same raw materials as conventional fish feeds can be used. Containing, especially 5 to 30
It is preferred to have an oil content in the range of 15% by weight and a water content in the range of 15-40% by weight. As a starch raw material,
Flour and starch are essential ingredients. Starch depends on the hardness of the target fish feed, etc.
Wheat, rice, tapioca, milo, sorghum, horseradish,
Various types of starch such as sweet potatoes and sago palm can be used. Tapioca starch is preferred in order to obtain a molded feed having both softness and elasticity. When the oil content is high in such an amount, an excellent effect in promoting the growth of fish can be obtained. The oil content includes animal fats and vegetable fats and oils in addition to fats derived from raw materials such as fish meal. As the fats and oils, those containing ω3 fatty acids of highly unsaturated fatty acids are preferable, and those having a melting point of −20 to 50 ° C. are preferable.

Here, the total amount of water is from 15 to 45 in consideration of the moisture derived from the raw materials so that it is in a state suitable for obtaining a material having a moisture content of 15 to 40% by weight after extrusion molding and drying. It is advisable to add water to make up the weight percentage. Since a relatively large amount of fat or oil is added at the time of compounding the raw materials, it is preferable to perform pressure extrusion using a twin-screw extruder so that the material does not slip during the pressurization process and pressurization becomes insufficient. When a twin-screw extruder is used, it is possible to press and heat and knead at a low temperature of 80 to 100 ° C. by suppressing frictional heat, and to suppress deterioration of the raw material due to overheating and oxidation. In the above method, by extruding the raw material under pressure and heat into the air, the water evaporates and expands substantially under reduced pressure, and immediately thereafter, the water content is dried until the water content reaches a predetermined value. A porous body can be manufactured.

[0012] The feed for use as a feed for fish farming has a particle size ranging from a fine particle using a mixture of a plurality of nutrients to an arbitrary particle size, depending on the fish species, the growth stage, and the like.
In addition, the water must have a long floating time when introduced into water and a high sedimentation speed, and must have low elution of water-soluble nutrients. In order to obtain a feed satisfying these conditions, it is preferable to produce a particulate feed using an extruder. By using an extruder to produce particulate feed, it is possible to save labor, reduce time, and reduce production costs. That is, it is possible to produce a large amount of particulate feed in a short time only by supplying an arbitrary raw material, oil and fat, and water to the extruder. Further, in terms of composition, in the case of an extruded feed, only a flour may be used as a binder, but corn or potato starch may be used. In addition, the running cost of the extruder is considerably lower than that of the freeze dryer and the fluidized bed granulator. In addition, by covering the surface with a starch and protein blend, it is possible to obtain a particulate feed with less elution of water-soluble substances, better digestibility and absorption, and a savory feed-inducing effect.

[0013]

[Function] In the heating step, krill is heated in a fresh state immediately after being caught or in a frozen state, so that proteins are fixed, a high-quality active ingredient is trapped inside the body, and the active ingredient is degraded. Can be prevented. In addition, the solidification of this protein makes the krill less crushable.

In the decompression and / or compression step, the pressure is reduced and / or compressed so that the volume is 95 to 25% by weight and the water content is 15 to 60% by weight as compared with the non-pressurized state. By this step, excess moisture and bubbles accumulated in the gap between the shell and the body are discharged to the outside of the krill. That is, in the above-mentioned heat processing, the body of the krill shrinks somewhat to form a gap between the shell and the body, and moisture and bubbles enter into the gap. In the past, due to the presence of the air bubbles, the specific gravity of the feed was light and it was difficult for the feed to settle in water, especially when the feed was used as it was. However, in this step, excess water and air bubbles are discharged to the outside.

In the decompression and / or compression step, the heated krill is targeted, so that the protein component is hardened and the body is not easily crushed. Therefore, even if the pressure is reduced and / or compressed, the krill is not crushed. While keeping the prototype, only excess water and air bubbles are removed, thereby preventing the outflow of the active ingredient of krill. If krill in a non-heated state is targeted, the gel-like body may be crushed, the active ingredient may flow out together with moisture, and only the shell may remain, resulting in a state in which the active ingredient is poor.

The krill from which the air bubbles have been removed has a higher specific gravity and tends to settle in water. In this state, the specific gravity of krill is constant, but small krill sediments quickly because the resistance of water is small, but large krill has large resistance of water and the sedimentation speed becomes slow.
As described above, since there is an individual difference in the sedimentation velocity, in the particle forming step of the next step, krill is formed into particles having a constant particle diameter, and the sedimentation velocity in water of each molded product is made uniform. be able to.

In the decompression and / or compression step, by adjusting the decompression and / or compression force, the amount of air removed can be adjusted and the specific gravity of the molded product can be changed.
Further, in the particle molding step, by adjusting the particle diameter of the molded article, the resistance of the molded article to water can be changed. As described above, by adjusting the specific gravity and the particle diameter of the molded product, it is possible to arbitrarily adjust the reachable depth and sedimentation speed of the feed in water. Then, if the pressure is reduced and / or compressed with a small pressure and / or compression force, air is removed to such an extent that the air does not float on the water surface, but the residual ratio of air is increased and the specific gravity of the feed is reduced. Therefore, it is preferable to use it for fish that are active near the water surface. Furthermore, if the particle diameter of the light-weight molded article is reduced to a small diameter, the sedimentation velocity is increased because of the low resistance of water, and the water quickly reaches the target water area. In addition, when the particle diameter is increased, the molded article receives a large resistance to water, so that the sedimentation speed becomes slow, and the sediment slowly sinks to a target water depth. Feeds having these sedimentation speeds can be used according to various conditions such as the target fish species, water depth, and water flow. Also, if the pressure is reduced and / or compressed with a large pressure and / or compression force, the molded product has a large specific gravity and a high sedimentation speed because a large amount of air is removed.
The sedimentation velocity can be further increased by forming the particle having a large specific gravity into a small particle diameter.

Since fresh krill immediately after catching is used to produce the active ingredient without damaging the active ingredient, it is possible to obtain a product sufficiently containing a high-quality active ingredient that attracts fish.

Conventionally, when there is much water, it is heavy and difficult to handle,
Problems such as taking a long time for freezing and thawing occurred. Excess water is removed from the molded product during production, resulting in a water content of 1
Since it is 5 to 60% by weight, when the feed is frozen and thawed for use, freezing and thawing can be performed in a short time and with little energy. Further, since the volume is reduced and the water content is reduced by decompression and / or compression, a feed that is not bulky and light in weight can be obtained. The storage efficiency is improved, and storage in a freezer, transportation by the freezer, and the like can be performed efficiently.
Since the outflow of water at the time of thawing is small, the disappearance of the active ingredient can be suppressed, and the fish collecting effect and the growth / survival effect are not impaired.

When krill is depressurized and / or compressed, as described above, the volume is 95 to 2 times as compared with the non-pressurized state.
It is preferable to carry out the treatment in an amount of 5% and a water content in the range of 15 to 60% by weight. If the volume is less than 25% or the water content is less than 15% compared to the non-pressurized state, the pressure is reduced and / or increased by a large decompression and / or compression force.
Or, when compressed, the amount of bubbles removed from the molded product is large, and the specific gravity is increased. However, the krill is crushed to the inside and the active ingredient inside flows out, so that the effect of collecting fish and the effect of growing and surviving are reduced. Conversely, when depressurizing and / or compressing with a small decompression and / or compression force such that the volume is greater than 95% and the water content is greater than 60%, air and moisture are not sufficiently removed from the molded product. Good sedimentation in water is no longer possible. In addition, storage and transportation efficiency is reduced, and freezing and thawing takes time and effort.
Further, it is preferable that the particle size of the molded product is also 1 to 30 mm. If the particle size of the molded product is smaller than 1 mm, even if the specific gravity is large, the molded product floats on the water surface due to surface tension and hardly sediments to the active water area of fish. Further, when the particle diameter is 4
If it is larger than 0 mm, the resistance of water is too large, and the sedimentation speed becomes slow.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments. The present invention is not limited by these examples.

Example 1 (Fish for Feeding Fish) In a method for producing the same, first, in a heating step, 100 kg of krill within 60 minutes after catch is prepared. The krill is a kind of shrimp, azalea, etc. and has a body length of 45-5.
A 5 mm one is used. Next, this 100 kg krill was stored in a kettle containing boiling water at 80 to 90 degrees,
Heat in boiling water for 3 minutes. As described above, since fresh krill is heated immediately after being caught, it is possible to obtain krill containing many high-quality active ingredients.

Then, the subsequent pressurizing step and particle forming step are continuously performed by a pressing machine. This pressing machine (2)
As shown in FIG. 1 and FIG. 2, a hopper-shaped compression section (3) for storing and compressing krill (1) is connected to a lower end of the compression section (3) via an introduction path (4). And a molding part (5) for molding the krill (1), which has been completely compressed, into a certain particle diameter. In addition, the introduction path (4)
An opening / closing door (6) is disposed so as to be openable and closable, so that the communication between the compression section (3) and the molding section (5) can be established and blocked. And
In the pressurizing step, in the pressing machine (2) configured as described above, first, the opening / closing door (6) is closed and the introduction path (4) is closed.
The compression part (3) and the molding part (5) are shut off. Then, the krill (1) pulled up from the kettle in the heating step is stored in the compression section (3). By heating the krill (1) with hot water, the body shrinks somewhat to form a gap between the shell and the body, so that moisture and bubbles enter into the gap.
In this pressurizing step, the volume of krill (1) can be reduced, and at the same time, the excess water and bubbles can be removed.

According to the method, when the krill (1) is stored in the compression section (2), as shown in FIG. 1, an inner lid (7) is slidably mounted inside the compression section (3), and Lid (7)
Is pressed with a pressing force of 50 kg / cm ³ through the above. By this pressing, the krill (1) in the compression section (3) removes excess moisture and bubbles existing in the gap between the shell and the body, and has a volume of 4 times as compared with the non-pressurized state.
Compressed to 0%. The water and air flowing out of the krill (1) are discharged to the outside through an outflow pipe (8) provided below the compression section (3). Further, by removing the water, the water content of krill (1) is reduced to 40% by weight as compared with the non-pressurized state. In addition, in this pressurizing step, if krill (1) is pressurized without heating, the jelly-like body is crushed, so that the active ingredient flows out together with the water, and the quality of the scattered bait decreases. Would. However, in the present invention, the protein component is fixed by pre-heating in the heating step, so that the krill (1) after heating is less likely to collapse and the protein in which the active ingredient other than the protein is solidified. Is held in
Therefore, even if the krill (1) is compressed in the compression section (3), the krill (1) remains intact without crushing itself, and only excess water and bubbles between the shell and the body are removed, and the active ingredient Loss can be prevented.

After the krill (1) pressurizing step is completed, a molding process is performed in the next particle forming step. First, as shown in FIG. 2, the opening / closing door (6) is slid outward to open the introduction path (4), and the compressed krill (1) in the compression section (3) is formed into a molding section (5). Introduce to the side. In the forming section (5), the krill (1) is forcibly transferred in the direction of the discharge port (11) by rotating the screw conveyor (10) mounted therein, and the discharge port (1) is rotated.
Forcibly discharge from 1) to the outside. This outlet (11)
Is provided with a wire mesh (12) having a mesh size of 16 mm, so that the krill (1) is cut by the wire mesh (12), formed into a molded product (13) having a particle diameter of 10 to 20 mm, and discharged. It is pushed out from (11).

The molded article (13) formed as described above may be sold or used as feed as it is. However, in this embodiment, in order to improve the preservability, the molded article (13) is finished after the particle molding step. 13) The freezing process is performed. Since the moisture content of the molded product (13) is reduced by compression, the freezing process can be efficiently performed in a short time and with little energy. In addition, since the volume is reduced, the product is excellent in storage efficiency and transport efficiency when stored frozen.

When using the feed formed as described above,
First, thaw the frozen product. Also in this case, as described above, since the water content is reduced, the thawing time can be shortened, and easy use is possible. In addition, since the volume is reduced and the water content is reduced, the amount of water flowing out during thawing is small, the loss of the active ingredient of krill can be suppressed, and the trouble of discarding water is also omitted,
Because it is light and compact, it is easy to carry around,
It will be easy to handle.

Then, the thawed feed is dropped on the water surface. Since the air is sufficiently removed during production to increase the specific gravity, the time for floating on the water surface is short, and it surely sinks in water. And since the specific gravity of each molded product (13) is increased and the particle diameter is set to 10 to 20 mm, sedimentation to a deep field becomes possible, and the sedimentation speed becomes high. In addition, since the sedimentation speed is fast, it reaches the active water area of fish depending on the species of the cultured fish. Using krill immediately after catching,
Since it is formed by a production method that does not lose the active ingredient, it contains a lot of high-quality active ingredients, and the feed of this example is
High appeal to fish due to odor and taste components. Since it is possible to ensure that high-quality feed reaches the active water area of the fish, it can inspire appetite and contribute to growth and survival effects.

In the above embodiment, the molded product (13)
Has a particle diameter of 10 to 20 mm, a volume of 40% as compared to the non-pressurized state, and a water content of 40. However, as another different embodiment, it is possible to form a molded article (13) having a different specific gravity by adjusting the pressing force at the time of compression by the pressing machine (2). Further, the particle size of the molded product (13) can be arbitrarily changed by adjusting the mesh size of the wire mesh (12) when the krill (1) is formed into particles. By adjusting the specific gravity and the particle diameter in this way, it is possible to arbitrarily set a sedimentation speed and a sedimentable depth when the molded article (13) is dropped into water.

For example, when krill (1) is compressed with a large pressing force, a large amount of air bubbles and moisture are removed and the volume is reduced, so that the specific gravity of the molded product (13) is increased. Since such feed reaches deep waters, it has an excellent collecting effect, growth and
It shows a survival effect. In addition, when compressed with a small pressing force, the content of air increases, so that the molded product (13)
Specific gravity becomes lighter. Therefore, the feed sinks in the water, but floats in a shallow water area, and has excellent effects of collecting fish, growing and surviving on cultured fish species bred near the water surface.

However, when krill (1) is pressurized, it is preferable that the volume in the non-pressurized state is 95 to 25% and the water content is 15 to 60%. When compressed with a large pressing force such that the volume is smaller than 25% and the water content is smaller than 15% by weight as compared with the unprocessed state, a large amount of moisture and air bubbles can be discharged, but the krill (1) remains It is crushed and loses its original shape, and the active ingredient is lost, so that its appeal to fish is reduced. Conversely, when compressed with a small pressing force such that the volume is greater than 95% and the water content is greater than 60% by weight, the molded product (1
3) A lot of moisture and bubbles remain in the product, and good sedimentation into water is not performed, or the product requires time and labor for freezing and thawing.

The sedimentation speed of the feed can be adjusted by changing the mesh size of the wire mesh (12) of the pressing machine (2) and adjusting the particle size of the molded product (13). Then, for example, the heated krill (1) having the same specific gravity as that of the first embodiment is discharged to the outside through a wire mesh (12) having a larger mesh size than that of the first embodiment, and a large-diameter molded product (13) To form The large-sized molded product (13) has a higher sedimentation speed than that of the first embodiment because the resistance of water is increased. When the thus formed feed is dropped into water, it sinks to a deep field at a slow speed. Further, the wire mesh (1) having a smaller mesh size than that of the first embodiment.
By obtaining a molded article (13) having a small diameter by using the method (2), it is possible to reduce the resistance of water and obtain a feed having a higher sedimentation speed than in the first embodiment.

However, when used directly as feed,
The molded product (13) preferably has a particle diameter of 1 to 30 mm. If the particle size of the molded article (13) is smaller than 1 mm, the whole weight is too light and floats on the water surface, and does not settle to the target water area. In addition, molded articles (13)
If the particle size is larger than 30 mm, the resistance of water is too large, the sedimentation speed becomes slow, and it takes too much time to reach the target water area.

As described above, the sedimentation speed and the sedimentable water depth of the feed can be arbitrarily adjusted by adjusting the specific gravity and the particle size of the molded article (13). And a product with a high sedimentation speed or a product with a low sedimentation speed can be obtained. In addition, it is possible to obtain a product that sinks to a deep place or a product that floats near the water surface. for that reason,
It is possible to arbitrarily select and use a product according to a fish species, a growth period, and the like. Further, since the feed is formed by adjusting the sedimentation speed in advance during production, ready-made products can be arbitrarily selected according to the purpose. And
It can be used easily without the need for the time and skill of compounding.

Example 2 (Fish for feed) The feed of Example 1 is used as a raw material for feed for fish and a feed for fish farm is manufactured by a usual extrusion method. For 100 parts by weight of the ingredients shown in Table 1,
8 parts by weight of fish oil, 4.5 parts by weight of lecithin and 38.5 of water
A part by weight was supplied to a twin-screw extruder and processed at a screw rotation of 150 rpm and a tip barrel temperature of 250 ° C. The pressure at this time was 1 kg / cm ² . It was extruded from an extruder and a feed for fish farming was obtained. .

[0036]

[Table 1]

According to this embodiment, it is possible to produce a particulate feed for fish farming using an extruder. The feeding test also showed growth survival similar to conventional raw food and EPA-based rearing.

[0038]

Industrial Applicability The present invention is directed to a fish feed for fish farming, such as sea bream, red sea bream, Japanese flounder, Japanese horse mackerel, and sweetfish, which are settled at a moderate speed when water-soluble nutrients are dropped and dropped at an appropriate speed when dropped on the water surface as it is. A feed for fish farming that can be suitably used as a forage feed for the larvae or fry, or a feed ingredient for fish farming used in combination with other ingredients, and a growth / feeding ingredient used in combination with the feed ingredients for fish farming with other ingredients. It is possible to provide a feed for fish farming which is excellent in survival and has a krill-derived protein as an active ingredient, which has a low elution of water-soluble nutrients when introduced into water.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where heated krill is compressed in a compression unit of a pressing machine.

FIG. 2 is a cross-sectional view showing a state in which heated krill is being formed into a molded product having a constant particle diameter in a molding section of a pressing machine.

[Explanation of symbols]

 1 krill 13 molded product

Claims (7)

[Claims] 1. A feed material for fish farming comprising a semi-dried product having substantially no gap between the body and the shell of the heated krill. 2. A raw or frozen krill, which is heated and reduced and / or compression-molded, has a volume of 95 to 25% and a water content of 15 to 15% as compared with a non-pressurized state. The feed material for fish farming according to claim 1, wherein the weight is 60% by weight and the particle diameter is 1 to 30 mm. 3. The feed material for fish farming according to claim 1, which is a frozen product. 4. A feed for fish farming using the raw material for feed for fish farming according to claim 1, 2 or 3. 5. The feed for fish farming according to claim 4, further comprising flour, starch, water and oil. 6. The fish feed according to claim 5, which contains water in a range of 15 to 40% by weight. 7. The feed for fish farming according to claim 5, which comprises an oil content in the range of 5 to 30% by weight.