JPH0657108B2 - Feed for fish farming - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fish feed. In recent years, aquaculture of sea bream, sea bream, flounder, horse mackerel, tiger puffer, coho salmon, etc. has become popular, but as a food for these fish,
The ones used are thawed frozen fish such as sardines, mackerel, sago, lionfish, krill, etc. in the open air, seawater, etc., and fed with minced or chopped raw food. As a result, the quality of raw food decreases during thawing, and thaw juice during thawing and residual food after pouring cause fishfield contamination, which in turn causes red tide, leading to frequent disease and survival rates. , As a decline in the growth rate, has become a major problem.

Against these current circumstances, in the fish feed, in the frozen state, crushed to an appropriate size, after mixing this with a powder feed containing fish meal, vitamins, minerals, etc., so-called mash, BACKGROUND ART Fish feeds that are formed into arbitrary shapes (generally pellets) are known. In addition, there is also known a feed for fish farming comprising an alginate and a calcium salt as a binder, and further guar gum and the like. Further, a binder composed of alginate, guar gum and carboxymethyl cellulose salt has been proposed.

The feed for fish farming with these binders has a basic mixture of granulated ones (generally called moist pellets) with a mixing ratio of raw feed (frozen fish, minced frozen fish) 1 / mash 1. There is.

Further, the particle size is usually 5 to 7 mm in diameter.

However, recently, due to reasons such as economy and palatability of cultured fish, the proportion of raw bait 2 to 4 / mash 1 and the size of moist pellet have been widely demanded with a diameter of 3 mm to 30 mm.

The present inventors have arrived at the present invention as a result of earnest research in order to satisfy these needs. That is, the present invention has an etherification degree of 0.8 or more, a 1% aqueous solution and a viscosity of 9000.
The present invention provides a feed for fish farming, which comprises a carboxymethylcellulose salt of cps or more and a raw mash and a mash in a mixing ratio (weight ratio) of 4/1 to 1/2.

The present invention is particularly applicable to pellets having a diameter of 15 mm to 30 m.
In the object of m, a particularly excellent effect is exhibited.

The degree of etherification indicates how many carboxymethyl groups in one glucose unit of cellulose substitute the hydroxyl groups of glucose with an ether bond.

Examples of the carboxymethyl cellulose salt include sodium, potassium, and ammonium salts.

One of the properties required of the binder is water absorption, but it is recognized that it is better to increase the degree of polymerization, that is, to increase the viscosity, in order to impart water absorption to the carboxymethyl cellulose salt. ing. The degree of etherification is an index showing the amount of polar groups, and affects the tackiness (adhesiveness and bondability) required for the binder of the moist pellets.

The present inventors, as a result of the examination, when the degree of etherification of the carboxymethyl cellulose salt is low, the tackiness is weak, and it becomes a fragile moist pellet, which tends to break up at a small diameter, but at a large diameter. , This tendency is remarkable. On the other hand, when the degree of etherification is high, the tackiness is strong and stickiness occurs in small-sized moist pellets (about 3 mm), sticks to each other, and agglomeration occurs, but in pellets with a diameter of 15 to 30 mm, It has been found that the problem of (1) is solved and pellets with solid physical properties can be obtained.
However, in terms of viscosity, the viscosity of a 1% aqueous solution is 9000 cp
s or more is required. If the viscosity is less than 9000 cps, the moist pellets are likely to collapse even if the degree of etherification is 0.8 or more.

Therefore, in the present invention, the degree of etherification of the carboxymethyl cellulose salt is 0.8 or more, more preferably 0.
It is 9 or more.

It does not matter even if the binder of the present invention is mixed with other binders such as sodium alginate, guar gum and sodium polyacrylate.

The amount of the feed for fish culture of the present invention is 0.3 to 10% by weight, more preferably 1.0, based on the moist pellets.
The amount of up to 3.0% by weight is also advantageous in terms of performance and economy.

The present invention will be specifically described below with reference to examples.

Example As shown in [Table 1], 96 parts by weight of fish meal [white fish meal] were treated with carboxymethyl cellulose sodium salt (hereinafter CMC-Na) [A-1], [A-2] and [A-3] ( The viscosity measurement is a value obtained by measuring a 1% anhydrous solution in water at 25 ° C. using a B-type rotary viscometer rotor No. 4 and a rotation speed of 30 rpm. The same applies hereinafter) obtain.

On the other hand, the frozen sardine is minced with a crusher or an iron hammer and crushed with a chopper to obtain a minced raw bait of the frozen sardine. Next, 40 parts by weight of the above mash was thoroughly mixed with 60 parts by weight of the obtained minced raw bait with a mixer or the like, and then a moist pellet was obtained by a granulator with a plate hole diameter of 19 mm.

Table 1 shows the appearance and physical properties of the moist pellets.

As comparative products, CMC-Na [B] having an etherification degree of 0.56 and a 1% aqueous solution viscosity of 10500 cps, and CMC-N having an etherification degree of 1.25 and a 1% aqueous solution viscosity of 3500 cps.
The case where a [C] is used is also shown.

Claims (1)

[Claims] 1. A 1% aqueous solution having an etherification degree of 0.8 or more,
A live bait and a mash characterized by containing a carboxymethylcellulose salt having a viscosity of 9000 cps or more are 4 /
A feed for fish farming consisting of a mixture ratio (weight ratio) of 1 to 1/2.