JP2003284508A - Extruder feed for fish culture, and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing extruder feed for fish culture, making it possible to regulate a sedimentation rate while maintaining formability by solving the problem that the sedimentation rate is varied according to the difference in raw material lots when EP feed is molded even though the respective lots have the identical compound formulation of the raw materials. <P>SOLUTION: The extruder feed for fish culture is formulated with ≥0.05 wt.% polyacrylic sodium. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an extruder feed for fish farming (hereinafter referred to as EP feed) and a method for producing the same.

[0002]

2. Description of the Related Art EP feeds formed by using an extruder as dry pellets for fish farming have been widely spread,
The penetration rate of moisture pellets, which has been the mainstream in the past, has been far exceeded. This is probably because, in recent years, the production amount of moisture pellets has placed a heavy labor burden on the producers as well as the decrease in the amount of inshore fish. The advantage of EP feed is that the cooking action of the extruder efficiently converts the starch in the raw material into alpha, which improves digestibility and digestion, and it is possible to produce high-energy feed containing up to 30% oil and fat. Is. It is recognized as an excellent feed that is not only biologically highly nutritious but also environmentally friendly. However, it is important for the EP feed to adjust the sedimentation rate of the feed when it is fed as a feed, depending on the type of target fish. If the sedimentation speed is too fast, the fish will not catch up with the sedimentation speed of the bait, and the fish will pass from the bottom of the cage to the seabed, thus lowering the food efficiency. In addition, when the bait floats on the surface of the water, the bait is washed away from the cage, which also reduces the bait efficiency. It is necessary to adjust the sedimentation rate according to the type of fish to be targeted. To adjust the sedimentation rate of EP feed, 1. Adjusting the amount of fat and oil added 2. 2. Adjust the length of the pellet with respect to the diameter. The amount of added water and the temperature of the product are adjusted to adjust the expansion rate when extruded from the nozzle die. Regarding EP feeds, it is known how to adjust the sedimentation rate of EP feeds by specifying the length / diameter ratio. (JP-A-11-27609
On the other hand, the moisture pellets contain a specific sodium polyacrylate as a thickening agent,
It is known to reduce the collapse of moisture pellets. (Patent No. 2870715)

[0003]

Under the above circumstances, the adjustment of the sedimentation speed of the EP feed which can be normally produced can be performed without complicated adjustment and product loss occurring at the time of adjustment, and without causing a motor load. A method that enables is desired.

[0004]

Therefore, as a result of diligent studies, the inventors of the present invention have added sodium polyacrylate in an amount of 0.05% or more to a raw material powder prepared by compounding and pulverizing various raw materials to be charged into an extruder. It was found that the sedimentation rate can be adjusted by That is, the present invention is

(1) 0.0% of sodium polyacrylate
Extruder feed for fish farming containing 5% or more, (2)
Powder for producing the fish-feeding extruder feed according to the above (1), which contains one or more binders selected from the group consisting of sodium carboxymethyl cellulose, sodium alginate, and guar gum, and (3) producing a fish-feeding extruder feed. TECHNICAL FIELD The present invention relates to a method for producing an extruder feed for fish farming, which comprises adding sodium polyacrylate in an amount of 0.05% or more to a body-mixed feed material, mixing the ingredients, and then producing the mixture with an extruder.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Sodium polyacrylate to be added to the EP feed of the present invention is a highly safe one which has been used as a food additive and a feed additive for many years, and generally has a molecular weight of 1,000,000 to 10,000,000. , Preferably 3 million ~
It is about 7,000,000, and more preferably about 5,000,000 to 6,000,000. The particle size may be finer, such as 100 mesh pass 50% or more, preferably 100 mesh pass 80% or more.

The EP feed of the present invention contains sodium polyacrylate in an amount of 0.05% or more, preferably 0.0
5 to 1.0%, more preferably 0.1 to 0.3%
It is about the amount of addition.

In the EP feed of the present invention, sodium polyacrylate can be used alone, but other binders can be used alone or in combination. The binder is a natural binder such as sodium carboxymethyl cellulose, sodium alginate, and guar gum. For example, sodium carboxymethylcellulose is a white to pale yellow powder with what is listed as a food additive, feed additive, one in which the -OH groups of the cellulose was substituted by OCH ₂ COONa. Sodium alginate is listed in food additives and feed additives, and is a white to yellowish white powder that is almost odorless and tasteless. Guar gum is a natural product and a polysaccharide derived from its seeds, and other resins, such as gum arabic, a polysaccharide derived from sap, a polysaccharide carrageenan derived from seaweed, a fermented product polysaccharide chitansan gum and the like can be mentioned. . In addition, sodium polyacrylate and sodium carboxymethyl cellulose, sodium alginate,
When a binder such as guar gum is used in combination, the amount of the binder added is usually 10% to 90%.

The term "EP feed" as used in the present invention means a feed granulated by using an extruder, and the composition of the EP feed is, for example, 70% fish meal, 20% wheat flour, 3% vitamin mix, 4 mineral mix. %, Feed oil 3%. In order to produce the EP feed of the present invention, usually, various raw materials are compounded and pulverized, added to an extruder while adding fats and oils, added with water, and extruded from a die at high temperature and high pressure while kneading with one or two axes. Obtained through steps. The above composition, manufacturing process, and manufacturing conditions are
You may change suitably according to the kind of fish. Normally, the shape of EP feed is 0.5 mm to 50 mm in diameter and about 0.5 mm in length.
It is a cylindrical dry pellet of about 100 mm.

[0010]

The present invention will be described in detail below with reference to examples, but these do not limit the present invention.

Example 1 An EP feed of the present invention was produced with the following composition. 1. Extruder feed manufacturing conditions (1) Basic mix feed composition; Fish meal: wheat flour: soybean meal = 6
0:25:15 (2) Mix 10 kg of basal feed, and add sodium polyacrylate to the control group (no addition), 0.05, 0.1, 0.3,
The EP feed of the present invention was produced by adding 0.5 and 1.0 (% of the total EP feed), respectively.

2. Extruder setting conditions (1) Extruder EP manufacturing machine used; EA-20 (Suehiro EPM) (2) Setting conditions and actual manufacturing results (in parentheses) Temperature (° C) Die plate T3 Not set (51- 58) Tip barrel T2 90 setting (95 to 105) Intermediate barrel T1 100 setting (89 to 91) Added water amount (L / hr); 2.9 setting <Set EP feed water content 30% immediately after molding> Die plate pressure (Kg / cm ² ) P1; (15 to 1
7) Screw rotation speed (rpm); 80 set motor load (A); (11.2 to 12) Die hole diameter; 5.0 mm

3. The obtained EP feed was obtained as a dark brown, cylindrical dry pellet having a diameter of about 5 mm and a length of about 7 mm. A sedimentation rate test and a specific gravity test were performed on the EP feed obtained above.

1. Sedimentation rate test A 200 cm transparent PVC cylindrical container was filled with pseudo seawater to select EP feeds with almost the same diameter and length, and 100 each of them were dropped into the container and the time to arrive at the bottom was measured. Shown in 1.

[0015] Table 1 Test area (amount of sodium polyacrylate added) Time (seconds) Control section (no addition) 14.6 ± 1.17 0.05% 14.87 ± 1.0 0.1% 14.65 ± 0.88 0.3% 16.18 ± 0.98 0.5% 16.06 ± 1.28 1.0% 15.79 ± 1.03

From the results shown in Table 1, the addition of sodium polyacrylate (0.3%) gave a sedimentation rate of 1.58.
Seconds slowed down, and when converted into an actual cage (depth of about 10 m) again, the sedimentation rate was improved for about 8 seconds. It can be said that the addition of sodium polyacrylate can be used as a regulator for the retardation of the sedimentation rate.

[0017] 2. Specific gravity test Table 2 Addition amount Control area 0.05% 0.1% 0.3% 0.5% 1.0% Specific gravity 1.22 1.2 1.21 1.17 1.17 1.17 Indicator 100 98 98 99 96 96 96 96

From the results shown in Table 2, the specific gravity was slightly reduced by adding sodium polyacrylate.

Other negative factors such as motor load, shape change, and turbidity change on the extruder itself due to the addition of sodium polyacrylate were not found.

[0020]

[Effect of the Invention] By adding sodium polyacrylate to the raw material powder prepared by blending and pulverizing various raw materials to be charged into the extruder, the specific gravity was reduced and the sedimentation rate could be adjusted.

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Claims (3)

[Claims] 1. An extruder feed for fish farming, containing 0.05% or more of sodium polyacrylate. 2. Sodium carboxymethyl cellulose,
The extruder feed for fish farming according to claim 1, containing one or more binders selected from the group consisting of sodium alginate and guar gum. 3. When producing an extruder feed for fish farming, 0.05% or more of sodium polyacrylate is added to a powder-containing feed raw material, and after mixing, it is produced by an extruder. Manufacturing method of extruder feed.