JP2000201631A - Solid feed for pisciculture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solid pisciculture feed having soft texture, high fertilizing effect and feed intake, free from the generation of mold and putrifactive smell, having excellent moisture-retaining property, water-retaining property and preservability and useful for the culture of yellowtail, carp, etc., by including a prescribed amount of a sugar alcohol and adjusting the water content within a prescribed range. SOLUTION: The objective solid feed contains 0.1-5 wt.%, preferably 0.5-4 wt.% of one or more kinds of sugar alcohols selected from sorbitol, maltitol, xylitol, arabitol, erythritol, mannitol, galactitol, ribitol, lactitol and hydrolyzed product of reduced starch and has a water-content of 10-45 wt.%, preferably 15-35 wt.%. The solid pisciculture feed generally has the dimension of preferably 2-45 mm at the widest part and 2-30 mm at the narrowest part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a solid feed for fish farming. More specifically, the present invention is excellent in moldability during the production of solid feed for fish farming, has high moisture retention and water retention, is soft and has good feeding and digestive absorption by fish,
And it's moist, and it doesn't stand up,
It has a smooth and beautiful appearance, and has excellent shape retention despite its high water content.It does not deform, collapse, agglomerate, swell, etc., and also exudes or releases oil and burns oil. The present invention relates to a high quality solid feed for fish farming which is free of mold and putrid odor.

[0002]

2. Description of the Related Art Conventionally, fish meal, raw fish, soybean meal, pupa, and the like have been used as feed for fish farming in the form of powder or paste. However, in recent years, the catches of fish for feed such as sardines have decreased, and the cost of these conventional fish feeds has risen accordingly. Further, these conventional fish farm feeds are inferior in handling properties, and particularly difficult to automatically feed. In addition, the above-mentioned conventional feed for fish farming is not balanced with various nutrient components, and cannot be said to be sufficiently satisfactory also in terms of fish feeding ability. Therefore, for the purpose of improving handleability, improving the balance of various nutrients, improving feed efficiency by improving feedability, and reducing costs, oil and fats, flour, etc. are used for protein raw materials such as fish meal, raw fish, and soybean meal. ,
In recent years, solid feed for fish farming, in which other components such as starch, amino acids, sugar, vitamins, and minerals are blended, formed into pellets, and dried, has been widely used in recent years.

However, the pellet-type solid feed for fish farming described above is hard and cannot be said to be sufficiently satisfactory in terms of the taste and digestibility of fish and shellfish. Very low intake rate. In order to improve feedability, it has been practiced to administer fish feed solid feed beforehand by immersing it in water and softening it.However, since it is not possible to directly administer fish feed solid feed as it is, an immersion step is required. At present, it takes time and effort to feed, and at the present time, the effect of improving the feeding rate is not sufficient. It has also been proposed to directly produce solid feed for fish farming with a high water content for the purpose of improving feedability, but even in this case, the intake rate by fish cannot be said to be sufficiently good. There is a need for a solid feed for fish farming that has excellent baitability.

Further, conventional solid feed for fish farming having a high water content is inferior in shape retention, easily deformed, disintegrated, agglomerated, etc., and is initially soft. It is easy to be lost and hard, and from this point,
There has been a demand for a polyhydrated solid feed for fish farming that is excellent in shape retention even when the water content is high and can maintain the softness for a long time.

[0005] Further, since solid feed for fish farming generally contains oils and fats, oozing and release of oils and burning of oil (denaturation of oils and fats) are liable to occur. In addition, protein contained in feed,
Excessive coloring of products due to amino acids, sugars, etc. is likely to occur,
Furthermore, there was a problem that the storage stability was poor, and mold and putrid odor were easily generated. In order to avoid the above-mentioned problems, it is necessary to set the temperature and pressure conditions during the production of the solid feed for fish farming to a specific range, and to distribute and store the solid feed for fish farming at a low temperature, and there were various restrictions. . In addition, oozing and release of oil generated in fish feed solid feed cause contamination of the water environment to which the feed is administered, and oil burning and excessive coloring reduce the nutritional value and commercial value of fish feed solid feed. Is the cause.

Further, in order to improve the productivity by improving the processability in the production of solid feed for fish farming, it is necessary to easily form the pellets while keeping the load on the extruder low. However, the conventional pellet-type solid feed for fish farming described above cannot be said to have sufficiently good formability at the time of feed production, and improvements have been required.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an excellent formability for producing solid fish feed for fish farming having a shape such as pellets, and it is soft and easy to feed and digest and absorb by fish. Is to provide a good solid feed for fish farming. Further, the object of the present invention, in addition to the above properties, high moisture retention and water retention, despite being soft, excellent in shape retention, without deformation, collapse, aggregation, blistering, etc., Moreover, it is an object of the present invention to provide a solid feed for fish farming which can maintain a long softness without water evaporation and has a smooth and good surface. Further, the object of the present invention is to prevent the pollution of the water environment due to the above-mentioned various properties, furthermore, there is no oil seepage or release, and there is no oil burning and there is no denaturation of nutrient components. An object of the present invention is to provide a high-quality solid feed for fish farming, which has excellent characteristics of no odor.

[0008]

The present inventors have made various studies in order to achieve the above object. As a result, in the solid feed for fish cultivation, 0.1 to 5 sugar alcohols whose use has not been considered as an indigestible component until now have been considered.
When contained in a specific amount of% by weight, the above-mentioned various drawbacks of the conventional solid feed for fish farming are eliminated, and the forming of the solid feed into pellets by an extruder or the like can be smoothly performed with a low load. In addition, the resulting solid feed for fish farming is soft, has good feedability by fish, has excellent digestion and absorption properties, has high feed efficiency, and has excellent shape retention properties, such as deformation, collapse, aggregation, etc. It does not generate, has high moisture retention and can maintain softness for a long time, does not cause swelling etc. even if left in a high humidity atmosphere, has a smooth and good surface, and moreover, oil bleeding There is no release and it is hard to cause pollution of the water environment, oil burning does not occur, there is no denaturation of components, excellent storage stability,
No mold or rotten odor was found.

Further, the present inventors have found that when the sugar alcohol is contained in the fish feed solid feed at a ratio of 0.1 to 5% by weight, the water content of the fish feed solid feed exceeds 10% by weight.
When the content is 5% by weight or less, the processability for forming a solid feed for fish farming is further improved, and the softness of the solid feed for fish farming is increased, so that the intake rate and digestive absorption by fish are improved. Feed efficiency is greatly improved
Further, even when the water content in the solid feed for fish farming is set to a large amount exceeding 10% by weight and not more than 45% by weight, the shape retention of the solid feed for fish farming is good, and the initial shape and size are kept good. The present inventors have found that they have obtained the present invention and completed the present invention based on those various findings.

That is, the present invention relates to (1) a sugar alcohol containing 0.1 to 5% by weight and a water content of 1 to 5% by weight.
It is a solid feed for fish farming characterized by being more than 0% by weight and not more than 45% by weight.

The present invention relates to (2) a sugar alcohol selected from the group consisting of sorbitol, maltitol, xylitol, arabitol, erythritol, mannitol, galactitol, ribitol, lactitol and reduced starch hydrolyzate. As preferred embodiments, two or more kinds of the solid feed for fish farming of the above (1); and (3) the solid feed for fish farming of the above (1) or (2) having a water content of 15 to 35% by weight are included. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The sugar alcohol used in the solid feed for fish farming of the present invention is a polyhydric alcohol in which the aldehyde group and the ketone group of the sugar are reduced to primary and secondary alcohol groups, respectively. In the present invention, any of sugar alcohols can be used, and among them, one or two selected from the group consisting of sorbitol, maltitol, xylitol, arabitol, erythritol, mannitol, galactitol, ribitol, lactitol and reduced starch hydrolyzate The above are preferably used, and in particular, one or more of sorbitol, maltitol, and reduced starch hydrolyzate are more preferably used in terms of achieving the effects of the present invention, easy availability, cost, and the like.

The sugar alcohol used in the present invention may be in the form of a powder or a liquid. Among them, the powdered one is preferably used in view of handleability, granulation of fish feed solid feed in an extruder, and the like. Can be The sugar alcohol has a water content of 10% by weight or less,
A 10% by weight one is preferably used because it has good handleability and facilitates adjustment of the water content of the whole solid feed for fish farming.

The reasons why the above-mentioned various excellent effects are exhibited when the solid feed for fish culture of the present invention contains a sugar alcohol are not clear, but are considered as follows.
That is, a large number of hydroxyl groups in the sugar alcohol increase water retention and moisture retention, which keeps the solid feed for fish farming in a soft state and contributes to the improvement of the feeding and digestion and absorption of fish by the sugar alcohol. Water retention mentioned above
It is considered that the moisturizing action and the binder effect prevent evaporation of water from the solid feed for fish farming, maintain a soft state for a long time, and prevent deformation, collapse and aggregation despite the softness. On the other hand, the addition of sugar alcohol imparts a moisture-absorbing inhibitory effect to the solid feed for fish farming (giving a barrier property to the external environment), and does not cause swelling of the solid feed for fish farming even when left in a humid atmosphere. In addition, it is considered that the sweetness of the sugar alcohol also contributes to the improvement of the feedability. In addition, sugar alcohols have the effect of confining fats and oils in fish feed solid feed, which prevents oozing and release of oil and oil scorching, and the disinfecting and disinfecting effects of sugar alcohol on mold feed for fish culture solid feed. It is considered that the generation and decay of the sugar alcohol are prevented, and the melting property and water retention of the sugar alcohol contribute to the reduction of the viscosity of the feed material, thereby contributing to the improvement of the processability into pellets and the like.

[0015] The content of sugar alcohol in the solid feed for fish farming is from 0.1 to 0.1 based on the total weight of the solid feed for fish farming.
It is necessary to be 5% by weight, preferably 0.5 to 4% by weight. When the content of the sugar alcohol is less than 0.1% by weight, it is difficult to improve the molding processability when producing solid feed for fish farming such as pellets, and the shape retention and moisture retention of the solid feed for fish farming are difficult to obtain. , The moisture absorption inhibiting property decreases,
Deformation, disintegration, drying and the like are likely to occur, preventing oil oozing and release, preventing oil scorching, preventing the generation of mold and putrid odor, and furthermore, the effect of the present invention such as the feed surface is not smoothed Can not be obtained. On the other hand, when the content of the sugar alcohol exceeds 5% by weight, the digestibility of the solid feed for fish farming is reduced, the feed efficiency is reduced, and the cost is increased. Moreover, even if the content of the sugar alcohol exceeds 5% by weight, the moldability is improved, the shape retention, the moisture retention, the surface is smoothed, the oozing and release of oils and fats are prevented, the oil scorch is prevented, and mold and decay are prevented. The effect on prevention of odor generation does not improve further.

Further, the solid feed for fish farming of the present invention has a water content of more than 10% by weight and not more than 45% by weight, preferably 15 to 35% by weight, based on the total weight of the solid feed for fish farming. . When the water content of the solid feed for fish farming is more than 10% by weight and not more than 45% by weight, the viscosity of the feed raw material mixture is reduced, and the formability of the solid feed for fish farming having a shape such as pellets is reduced. It will be even better. In addition, when the water content is as described above, the obtained solid feed for fish farming becomes softer, so that the feedability and digestive absorption by fish are further improved, and despite that, distribution, storage, administration and the like No deformation, disintegration, or coagulation of the solid feed occurs, the original shape is kept well, and the handling is excellent. When the water content of the solid feed for fish farming exceeds 45% by weight, stickiness, crushing, aggregation of the solid feed for fish farming and the like are liable to occur, and the handleability tends to be reduced.

In the solid feed for fish cultivation of the present invention, as the feed raw material used together with the sugar alcohol, the same raw materials as those in the solid feed for general fish cultivation can be used.
Specifically, fish meal, meat meal, bone and meat meal, krill meal, squid meal, whole egg powder, egg yolk powder, egg white powder, skim milk powder, whole milk powder, casein, plankton, other animal protein ingredients; soybean meal, wheat gluten , Corn gluten, legumes and other vegetable protein ingredients; flour, rice flour, corn flour,
Flours such as barley flour; starches such as wheat starch, rice starch, corn starch, tapioca starch; rice bran, oil cake, soybean meal, feed yeast, and other vegetable materials; oils such as vegetable oils and animal oils Kinds; vitamins, minerals, amino acids,
Nutritional components such as sugars, proteins, enzymes and nucleic acids; antibiotics, antibacterial agents, crude drugs, hormonal agents, drugs such as growth promoters, coloring agents,
Ingredients such as fragrances, palatable substances, antioxidants, etc .; carboxymethylcellulose (CMC), sodium alginate,
Various gums, binders such as sodium polyacrylate, and the like, among these raw material components,
An appropriate one may be selected and blended according to the type of fish, the age of the moon, etc., to which the solid feed for fish culture is to be provided.

Among them, in the solid feed for fish farming of the present invention, fish meal, shrimp meal, krill meal, meat meal, bone meat meal, raw meat and / or soybean meal are preferably used as protein raw materials from the viewpoint of handleability and cost. ,
In particular, soybean meal, fish meal, shrimp meal and / or krill meal are more preferably used.

As described above, any of vegetable oils and / or animal fats and oils can be used as the fats and oils. However, fish oils are particularly preferred from the viewpoint of obtaining a solid feed for fish farming which is excellent in feedability. It is preferably used.

The solid feed for fish farming of the present invention comprises 0.1 to 5% by weight of sugar alcohol, 10 to 85% by weight of the above-mentioned animal protein material and / or vegetable protein material, flours such as flour and starch. (Starch binder) in an amount of 15 to 50% by weight, fats and oils in an amount of 0 to 30% by weight, vitamins, minerals and other components in an amount of 0 to 10% by weight, and a water content of 10% by weight. It is preferable that the content is more than 45% by weight or less, especially 0.5 to 4% by weight of a sugar alcohol.
30 to 70% by weight of the above-mentioned animal protein and / or vegetable protein material, 20 to 40% by weight of flour such as flour and starch (starch binder), and 5 to 2% of fats and oils.
0% by weight and 5 to 10% by weight of vitamins, minerals and other components, and a water content of 15 to 3%.
More preferably, it is 5% by weight. When the solid feed for fish farming of the present invention is composed of such a composition, the workability, handleability, and moldability in producing the solid feed for fish farming are improved, and the feed and digestibility of fish are soft and fish. Despite being extremely good and soft, it does not deform, collapse, agglomerate, sticky, etc., does not dry easily, does not cause swelling, and also has better oil bleeding and release, oil burning Prevented, very high quality.

The solid feed for fish farming of the present invention is in the form of pellets,
It can be any shape such as spherical, elliptical, cubic, rectangular, pyramidal, irregular small lumps, etc. Among them, pellets are easy to manufacture, mass production, handling, etc. It is preferable from the viewpoint of.

The size of the solid feed for fish farming may vary depending on the type and size of the fish and shellfish to be fed, but generally the size of the largest portion is about 2 to 45 mm and the size of the smallest portion is 2 to 45 mm. It is preferable to keep the range of about 30 mm from the viewpoints of taste and easiness of production by fish and shellfish. When the solid feed for fish farming is in the form of pellets, the diameter is about 2 to 30 mm, particularly about 3 to 20 mm,
And the length should be about 2 to 45 mm, especially about 3 to 30 mm, for ease of production, handling, feeding,
It is preferable in terms of digestibility and absorption.

The solid feed for fish farming of the present invention has a hardness
Measured by the method described in the section of Examples below, from 0.2 to
The range of 2.5 kg / cm ² is preferred from the viewpoints of feeding, digestion and absorption, handling, and prevention of collapse and deformation.

The method for producing the solid feed for fish farming of the present invention is not particularly limited. Typically, for example, the following method or the method, namely, using the above-mentioned feed raw material together with a sugar alcohol, A mixture having an alcohol content of 0.1 to 5% by weight and a water content of more than 10% by weight and not more than 45% by weight is obtained by using an extruder or other molding equipment to form a pellet or a mixture of the above. A method of molding into a solid form such as granules or small lumps of the above; using a feed material as described above together with sugar alcohol to form a mixture having a water content of more than 45% by weight, and extruding the mixture into an extruder or other molding processing equipment And then dried until the water content thereof is more than 10% by weight and not more than 45% by weight, after forming into a solid such as pellets or other granular or small lumps as described above. It can be.

Among them, the above method can directly produce a solid feed for fish farming having a water content of more than 10% by weight and not more than 45% by weight using an extruder or the like. The drying step is not required, and is preferably employed because it is excellent in processability and thermal efficiency. In particular, when the solid feed for fish cultivation of the present invention is produced by the above-mentioned method or the method using an extruder, generally, a pellet-shaped fish cultivation is performed at a low discharge pressure (die pressure) of about 3 to 15 kg / cm ^2. This is desirable because the solid feed for use can be produced smoothly with good productivity without causing clogging or the like in the die portion.

The mixing method and mixing order of the raw material components for producing the solid feed for fish farming are not particularly limited, but the addition of the sugar alcohol to the raw material for the feed is carried out at an early stage of the mixing during the production of the feed. It is preferable because the moldability is improved and the quality of the solid feed for fish farming obtained by uniformly dispersing the sugar alcohol in the feed is improved.

The solid feed for fish culture of the present invention is stored at room temperature,
It may be distributed, stored at a refrigerated temperature, distributed or stored or distributed in a frozen state, and particularly stored and distributed at a refrigerated temperature is easy to handle, prevent corrosion and deterioration, and is not consumed by fish. It is preferable from the viewpoint of baitability and the like.

The solid feed for fish farming of the present invention includes fish such as yellowtail, hamachi, red sea bream, eel, carp, sweetfish, salmon, trout, flounder, flounder, tiger pufferfish, tuna, amberjack, grouper, and crustaceans such as shrimp and crab. It is suitable as a feed for fish culture of fish and shellfishes or their young fish, and particularly as a feed for fish culture for yellowtail and red sea bream. In particular, the solid feed for fish culture of the present invention has a diameter of 1.5 to 5 mm and a length of 1.5 to 5 mm.
In the case of pellets having a relatively small size of about 8 mm, the above-mentioned fish and shellfish are easy to ingest, have low hardness, and are easily broken down in the digestive tract of fish, so that they are easily digested and absorbed, and the growth of seafood Can be greatly promoted.
The method of administering the solid feed for fish culture of the present invention to fish is not particularly limited, and for example, it may be administered by spraying by humans or by using an automatic spraying device.

[0029]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited by the following examples. In the following examples, the evaluation of the formability during the production of solid feed for fish farming was performed by measuring the load (kg) applied to the extruder with a pressure gauge attached to the tip of the die of the extruder when producing solid feed for pellet fish farming. / Cm ² ).
In addition, the hardness, moisture content of the obtained solid feed for measurement fish farming,
The following methods were used to determine the presence or absence of oil bleeding, the presence or absence of oil burning and the surface condition (smoothness), and the feeding ability of the solid feed for fish farming.

[Method of Measuring Hardness of Fish Feed Solid Feed] In the fish feed solid feed obtained in the following Examples or Comparative Examples, one normal fish feed solid pellet (pellet) having no deformation or collapse is produced. The fish solid feed is laid on a stage of a hardness measuring device (Kiya type hardness meter "KHT-20") to which a needle-shaped attachment with a sharp tip is attached, which is manufactured separately. A load was applied to the central portion of the side surface (length direction) of the solid feed for fish farming from above vertically by the attachment described above, and the load when the solid feed for fish farming was crushed was measured. The same measurement operation was repeated 12 times for the fish feed solid feed of each Example or Comparative Example, and the average of the 20 measurement results excluding the maximum value and the minimum value was taken, and the hardness of the fish feed solid feed ( kg /
cm ² ).

[Method of measuring water content of solid feed for fish farming]
The solid feed for fish culture was dried at 135 ° C. for 2 hours, and the water content (% by weight) of the solid feed for fish culture was determined from the following formula.

[0032]

## EQU1 ## Moisture content (% by weight) of fish feed solid feed = ｛(W
o-Wd) / Wo｝ × 100 [where Wo represents the weight of the solid feed for fish farming before drying (initial weight), and Wd represents the weight of the solid feed for fish farming after drying. ]

[Evaluation of presence or absence of oil oozing in fish feed solid feed] 10 g of fish feed solid feed obtained in the following Examples or Comparative Examples was spread in a single layer on kraft bag paper, and left as it was at room temperature. After standing for a month, the bleeding of the oily substance on the kraft bag paper was visually observed. If no bleeding of the oil occurred, it was evaluated as ○. If there was a little bleeding of the oil (the area of the bleeding was The case where the contact area was 接触 or less was evaluated as Δ, and the case where the oil bleeding was large (the bleeding area exceeded １ ／ of the contact area between the sample and paper) was evaluated as x.

[Presence or absence of oil burning and surface condition (smoothness)
Evaluation] The solid feed for fish farming obtained in the following Examples or Comparative Examples was filled in a polyethylene bag, sealed and packaged, stored at room temperature for one month, taken out of the bag, and taken out of 10 adults. The panel was visually observed, and the oil scorch was evaluated as a score of +1 for no oil scorch and -1 for an oil scorch, and the smoothness of the surface was evaluated as smooth. A score of +1 and a score of -1 for scorching and non-smoothness were given, and the scores of the ten panels were summed up to give a judgment result.

[Evaluation of Feedability of Solid Feed for Fish Farming] Temperature 2
In a culture tank containing 1,000 liters of water at 3 ° C., 100 larvae of juvenile yellowtail (average body weight: about 100 g / animal) were prepared in three sections. 0.4 kg of the solid feed for fish farming obtained in the example was administered, and the state of intake was observed 5 minutes after the administration.
A case of 00% is indicated by ○, and the intake rate is 80% or more and 100
% When the intake rate is less than 80%.
Was evaluated.

Example 1 (1) A basic formulation for solid feed for fish culture shown in Table 1 below was prepared.

[0037]

[Table 1]

(2) Raw materials other than fish oil in the basic formulation shown in Table 1 above were mixed (total 81.0 parts by weight),
To this, 3.25 parts by weight (4% by weight) of liquid sorbitol [“Sorbit T-70” (registered trademark) manufactured by Towa Kasei Kogyo Co., Ltd.] was added, and the mixture was uniformly mixed. [Ueda Iron Works Co., Ltd .; EP50) is supplied at a rate of 65 kg per hour to the feeder, and 14.6 kg per hour of fish oil is supplied to the feeder portion.
And water at a rate of 13 liters per hour,
Further, 13 kg of heated steam and 7 liters of water are supplied to the extruder at a rate of 1 hour, and a screw rotation number of 40 is maintained while maintaining the barrel internal temperature at 105 ° C.
After kneading at 0 rpm and a pressure of 5 kg / cm ² , a diameter of 3.
It is extruded into a rod shape from a die having a hole of 5 mm, cut into a length of 4.5 mm with a cutter to form a pellet, and the pellet is immersed in water at a temperature of 10 ° C. for 10 seconds. It was left under a condition of 30% for about 12 hours to obtain a solid feed for fish farming. The load at the tip of the die of the extruder during the production of the pelleted solid feed for fish farming was 8 kg / cm ² .

(3) The hardness or moisture content of the solid feed for fish cultivation obtained in the above (2), the presence or absence of oil bleeding, the presence or absence of oil burning, and the measurement or evaluation of the smoothness of the surface are carried out by the above-mentioned methods. The result was as shown in Table 2 below.
(4) The feedability of the solid feed for fish farming obtained in the above (2) was evaluated by the method described above, and the results are as shown in Table 2 below.

Example 2 (1) Instead of 3.25 parts by weight of liquid sorbitol, 3.25 parts by weight of powdery sorbitol [“Sorbit D-Powder” (registered trademark) manufactured by Towa Chemical Industry Co., Ltd.] (4% by weight), and the same basic composition as in (1) of Example 1 was used. The same operation as in (2) of Example 1 was performed to produce pelleted solid food for fish farming. The load at the tip of the die of the extruder during the production of the pellet-shaped solid feed for fish farming was 12 kg / cm ² . (2) Hardness of the solid feed for fish farming obtained in (1) above,
The measurement or evaluation of the water content, the presence or absence of oil bleeding, the presence or absence of oil scorch, and the surface smoothness were performed by the above-mentioned methods, and the results are as shown in Table 2 below. (3) The feedability of the solid feed for fish cultivation obtained in the above (1) was evaluated by the method described above, and the results are as shown in Table 2 below.

<< Comparative Example 1 >> (1) Example 1 except that sorbitol was not used.
Using the same basic composition as in (1) above, the same operation as in (2) in Example 1 was performed to produce pelleted solid feed for fish farming. The load at the tip of the die of the extruder during the production of the pelleted solid feed for fish farming was 15 kg / cm ^2.
Met. (2) Hardness of the solid feed for fish farming obtained in (1) above,
The measurement or evaluation of the water content, the presence or absence of oil bleeding, the presence or absence of oil scorch, and the surface smoothness were performed by the above-mentioned methods, and the results are as shown in Table 2 below. (3) The feedability of the solid feed for fish cultivation obtained in the above (1) was evaluated by the method described above, and the results are as shown in Table 2 below.

[0042]

[Table 2]

From the results shown in Table 2 above, Examples 1 and 2 containing sorbitol as a sugar alcohol in the range of 0.1 to 5% by weight and having a water content of more than 10% by weight and 45% by weight or less. It can be understood that the solid feed for fish farming of Example 2 has a smaller load on the extruder at the time of pellet production and is excellent in the formability at the time of feed manufacturing as compared with the solid feed for fish farming of Comparative Example 1 containing no sorbitol. Furthermore, the solid feed for fish farming of Examples 1 and 2 has a higher water retention rate and lower hardness than the solid feed for fish farming of Comparative Example 1, and as a result, it is understood that the feedability by fish is excellent. Example 1
And the fish feed solid feed of Comparative Example 1, which does not contain sorbitol, has no oil seepage and oil burning and has excellent surface smoothness and high quality. It can be seen that there is bleeding and oil burning, and that the surface is rusted and rusted, and the quality is inferior to those of Examples 1 and 2.

[0044]

According to the present invention, when a solid feed for fish farming such as pellets is produced by an extruder or the like, the load on a molding apparatus is low, the molding processability is good, the production is smooth and the productivity is high. can do. In the solid feed for fish farming of the present invention, the heating and drying step for reducing the water content in the feed is omitted, and the water content exceeds 10% by weight and exceeds 45%.
Since the content may be set to a high range of not more than% by weight, the nutritional components are not denatured by heating during drying, and the feed production process can be simplified, which is advantageous in terms of thermal efficiency. The solid feed for fish farming of the present invention is soft and has good feedability by fish,
Moreover, it has excellent digestibility and absorption, and high fertilizer efficiency. Moreover, the solid feed for fish farming of the present invention, despite being soft,
Deformation, disintegration, stickiness and aggregation do not occur, and it is excellent in handling. In addition, the fish feed solid feed of the present invention has a low water evaporation and can maintain a soft state for a long time, while on the other hand, even when placed in a high humidity atmosphere, the shift to the fish feed solid feed of the atmospheric humidity occurs. No swelling or stickiness of fish feed solid feed. Further, the solid feed for fish culture of the present invention,
There is no oozing or liberation of oil, and the pollution of the water environment is hard to occur. The solid feed for fish farming of the present invention does not suffer from oil burning, has no component denaturation, and has a good appearance with a crisp feel. Furthermore, the solid feed for fish culture of the present invention is excellent in preservability and does not generate mold or putrid odor.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Sakamoto 5-3-1 Tsurugaoka, Oimachi, Iruma-gun, Saitama Prefecture Nisshin Seifun KK Production Engineering Laboratory (72) Inventor Takayuki Takahashi Nishinasuno-cho, Nasu-gun, Tochigi 1242-5, Ioji, Nisshin Flour Milling Co., Ltd.Nasu Research Laboratory (72) Inventor Mutsuro Kawamoto 2-8-1-603 Kitamatsudo, Matsudo City, Chiba Prefecture (72) Kazuaki Kato 2-14- Nakasone, Yoshikawa City, Saitama Prefecture 23 (72) Inventor Koichi Kataura 498-4 Ho, Yoshikawa-shi, Saitama F-term (reference) 2B005 GA01 GA02 GA03 GA04 GA05 GA06 JA04 MB07 2B150 AA07 AA08 AB20 AE01 AE05 AE25 DA06

Claims (3)

[Claims] 1. A solid feed for fish farming comprising sugar alcohol at a ratio of 0.1 to 5% by weight and a water content of more than 10% by weight and 45% by weight or less. 2. The sugar alcohol is one or more selected from the group consisting of sorbitol, maltitol, xylitol, arabitol, erythritol, mannitol, galactitol, ribitol, lactitol and reduced starch hydrolyzate. 2. The solid feed for fish farming according to 1. 3. The solid feed for fish farming according to claim 1, wherein the water content is 15 to 35% by weight.