JPS5918027B2 - Artificial feed for yellowtail and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an artificial feed for yellowtail and a method for producing the same.

Traditionally, yellowtail farming has used live bait such as sand eel and mackerel, but raw bait has various problems such as how to obtain it, stability of quality, price fluctuations, storage, thawing method, and workability.
There has been a demand for the development of artificial feeds from the viewpoint of economy and workability.

Currently, there are two types of artificial feed for yellowtail that have been developed and are commercially available: powdered feed and solid feed.Furthermore, solid feed includes pellets, crumples, and expanded pellets that have been foamed to make them float. be.

These artificial feeds for yellowtail are generally mixed with live feed or used in combination, and in the case of powdered feed, water and oil are added and then kneaded using a meat chopper. Alternatively, a method is used in which the mixture is mixed with minced raw feed at a ratio of approximately 1:1 and granulated after adding oil, and in the case of solid feed, water and oil are added to coat the surface. Many swelling methods have been used.

However, when water and oil are added to powdered feed, the p
-) Granules granulated using a chopper or the like have physical properties suitable for raising yellowtail, but the feeding requires two steps: kneading and granulation, is complicated to operate, and requires a lot of time for feeding.

In addition, if a large amount of powdered feed is piled up, they will adhere to each other during transportation, making it difficult to handle during feeding, and the broken fine particles will scatter from the cut surface during granulation in water, causing becomes cloudy.

Such turbidity of the feeding water surface not only results in loss of feed, but also has the disadvantage that the yellowtails are startled and stop feeding, making feeding work time-consuming.

In addition, in the case of solid feed, it is most preferable from the viewpoint of workability to feed the solid feed as it is to the yellowtail, but since yellowtail has a very poor feeding ability compared to dry solid feed, it is recommended to feed the solid feed as it is to the yellowtail. There is little practice of paying salaries to

The cause of these problems is not clear, but it is thought to be physiological in yellowtail.

Therefore, it is common practice to add water and oil to solid feed to swell the surface, but even with this method, it is very difficult to uniformly swell each individual solid feed, and The swollen part of the fish easily disintegrates, and during feeding, it dissipates significantly into the water, making the feeding water surface cloudy.
There are disadvantages such as increased loss of feed.

As a result of intensive research to solve these problems, the present inventors found that if the surface of solid feed using fishmeal as a substrate is coated with a soft and elastic moist layer, feeding of yellowtail will be improved. They found that the feeding process was simple and easy, and based on this finding, they completed the present invention.

That is, the present invention is an artificial feed for yellowtail, which is obtained by coating the surface of a solid feed with fishmeal as a substrate with a soft viscoelastic wet layer, A method for producing artificial feed for yellowtail, which comprises adding 20 parts or more of powdered feed for coating and an appropriate amount of water to form a soft, viscoelastic moist layer on the surface with the solid feed as the core. Therefore, the object of the present invention is to make feeding and feeding in yellowtail cultivation simple and labor-saving, to prevent turbidity in the water, to improve feeding of yellowtail, and to improve the breeding performance. An object of the present invention is to provide a good artificial feed for yellowtail and a method for producing the same.

The present invention will be explained in detail below.

In the present invention, solid feed using fishmeal as a substrate includes:
Mainly fish meal such as white fishmeal, along with other raw materials such as yeast, soybean meal, vegetable oil meal, protein sources such as Antarctic krill meal, flour as a binder for forming into solid shapes; nutritional reinforcement Amino acids as
So-called solid artificial feed for yellowtail, which is made by uniformly mixing vitamins and minerals with one or more raw materials selected from other raw materials depending on the growth level of yellowtail, etc., and then molding it into a solid shape using a pellet molding machine etc. can be mentioned.

It is preferable to include nutritional substances that are easily soluble in water in the solid feed using fishmeal as a substrate.

Solid feed with fishmeal as a substrate may be in any shape as long as it can form a core when the surface is coated with a soft and elastic moist layer, such as pellets, crumples, and round granules. , or any other suitable shape, and preferably has a shape within a range where one of the length, width, and height is set to 1, and the other does not exceed 10.

The soft and elastic wet layer in the present invention is formed by coating the surface of a solid feed with fishmeal as a substrate with a coating powder feed and an appropriate amount of water.

This coated powder feed can use the same raw material composition as the solid feed with fishmeal as a substrate, but in order to add soft elasticity and prevent turbidity in the water,
It is preferable to add and mix a binder or cross-material such as wheat flour, alpha starch, active gluten, CMC (carboxymethylcellulose), and sodium polyacrylate.Also, the coating powder is coated with a substance that is palatable to yellowtail. By forming a moist layer in addition to body feed or water, the feeding ability of yellowtail can be further improved.

The ratio of powder feed for coating to form the wet layer is preferably 20 parts or more per 100 parts of solid feed using fishmeal as a substrate, and if it is less than 20 parts, it will be difficult to coat uniformly.

Preferably, the amount is in the range of 80 to 100 parts per 100 parts of solid feed containing fishmeal as a substrate.

The amount of water added to form the wet layer may be an appropriate amount that imparts soft viscoelasticity, but it is preferably in the range of 60 to 120 parts for the coated powder feed, and 60 parts or less and 12 parts.
If the coefficient is 0 or more, the wet layer collapses in the water or becomes scattered and dissipated.

Further, the amount of water added can be reduced as appropriate when a solvent such as propylene glycol is added.

Furthermore, oils such as cod liver oil are usually added when feeding artificial feed for yellowtail, but in the present invention, when adding these oils, they can be added at the same time as water is added when forming a moist layer. It may also be added after the formation of the wetting layer.

Next, the method for forming the wet layer is usually as follows.

Put 100 parts of solid feed prepared in advance using fishmeal as a substrate and 20 parts or more of powdered feed for coating into a rotary mixer, add water and, if necessary, oil, etc., and coat while rolling. let

At this time, the solid feed having fishmeal as a substrate may be first put into a mixer, and the powdered feed for coating and water may be added little by little at the same time and coated while rolling.

As described above, solid feed having fishmeal as a substrate, powdered feed for coating, and water are stirred and rolled for 1 to 10 minutes using a mixer.

The artificial feed for yellowtail consists of solid feed as the core, and powdered feed adheres to the surface of the feed in a moist state and coats it, forming a soft, viscoelastic moist layer on the surface.

The rotary mixer may be of any type as long as it can form a wet layer on the surface of solid feed with fishmeal as a substrate and water and powdered feed for coating, such as concrete. Mixer uniform conical mixer,
A dish-type mixer, other transfer-type granulators, etc. can be used.

The artificial feed for yellowtail of the present invention is a solid feed with fishmeal as its core, and its surface is covered with a soft viscoelastic wet layer, so if fed to farmed yellowtail, the feed will dissipate in the water The water is not cloudy, the yellowtail has excellent feeding properties, and the breeding results are also good.

In addition, a minimum amount of binder such as wheat flour is added to solid feed that uses fishmeal as a substrate to make it solid.

Expensive adhesives and glues such as CMC, active gluten, and sodium polyacrylate can be added only to powdered feed for coating.
Since the artificial feed for yellowtail of the present invention can be obtained, raw material costs can be reduced and feed efficiency can be improved.

Furthermore, the artificial feed for yellowtail of the present invention is simpler and more labor-saving than the conventional granulation of powdered feed.
Moreover, the feeds are less likely to adhere to each other and are easy to handle.

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 A basic feed having the raw material composition shown in Table 1 is moistened with steam, then put into a pellet molding machine with a die diameter of 4 mrn, molded, and then dried to produce solid feed A1R BL with fishmeal as a substrate.
t C1 was obtained.

Next, the feed having the raw material composition shown in Table 2 is pulverized using a high-speed pulverizer to form powdered feed for coating a2. b2. Obtained C2.

Solid feed a1 using the fishmeal obtained as above as a substrate.
100 parts each of bl and C1 were placed in a conical mixer and rotated, and then powdered feed for coating a2. b2. c2
20 parts, 50 parts, and 100 parts of each of the solid feed and water in an amount equal to the powdered feed for coating were sequentially added thereto while stirring and rolling for 3 minutes to form a wet layer of the powdered feed for coating on the surface of the solid feed.

Further, 5% of each feed was supplemented with cod liver oil to obtain artificial feeds A, B, and C for yellowtail of the present invention.

The artificial feed for yellowtail obtained in this way had a core of solid feed with fishmeal as a substrate, and a soft viscoelastic wet layer was formed on the surface.

Next, artificial feed A for yellowtail obtained as described above.

A rearing test was conducted by feeding B and C to yellowtail.

In addition, as a control group, basic feed c1 in Table 1 and feed C2 in Table 2 were mixed in a ratio of 1=1 and pelletized in the same manner as the solid feed with fishmeal as a substrate, and 50 parts of water was added to the control solid feed.
A ward that feeds cod liver oil with 5 parts added by external cutting,
A section was set up in which sandfish were fed, and a similar rearing test was conducted.

The number of fish reared was 100 in each section, and each test section A.

Fishes B and C were each fed the above-mentioned artificial feed for yellowtail A, B, and C in an amount of 25 to 5 times the total fish weight (in terms of dry matter).

In addition, the sand locust plot and the control solid feed plot were fed in an amount comparable to the amount fed in the test plot.

The test breeding period was 80 days. The results are shown in Table 3, and it can be seen that feeding the artificial feed for yellowtail of the present invention results in good breeding results.

In addition, using each test area where the breeding test has been completed, 2.5
kg of feed was fed to yellowtail, and the time required for feeding and the turbidity of the water surface were measured.

In addition, in place of the artificial feed for yellowtail of the present invention, the test group A was fed a commercially available powdered feed with water and cod liver oil added in the same manner as the control solid feed group, and granulated using an extruder. .

The results are shown in Table 4, and the artificial feed for yellowtail of the present invention had good feeding conditions, did not cause turbidity on the water surface, and was comparable to the sand eel group.

Claims (1)

[Scope of Claims] 1. An artificial feed for yellowtail, which is obtained by coating the surface of solid feed with a soft viscoelastic wet layer using fishmeal as a substrate. 2 Add at least 20 parts of powder feed for coating and an appropriate amount of water to 100 parts of solid feed with fishmeal as a substrate to form a wet layer with solid feed as the core and soft viscoelastic surface. A method for producing artificial feed for yellowtail, characterized by: