JPH037546A - Feed for adult fish of flounder - Google Patents

Abstract

PURPOSE:To make possible to obtain good ovum without abnormality of shape having excellent total ovum collecting amount, fraction of floated ovum, fertilization rate and hatchability, etc., in a large amount by mixing phospholipid into feed for adult fish of flounder. CONSTITUTION:Feed for adult fish of flounder is prepared by mixing fish meal, flour, oil cake of rice bran, oil cake of soybean, corn gluten meal, minerals, vitamins and caking agent (e.g. sodium alginate), etc., and further mixing raw feed (e.g. mince of saurel). In this case, the feed for adult fish of flounder is further mixed with phospholipid. As the phospholipid, yolk lecithin or soybean lecithin, etc., is preferably used and the mixing amount is suitably about 0.3-20%. Resultant phospholipid-containing feed is fed to adult fish of flounder bred with an object of seeding production and a large amount of good ovum is able to be obtained and further elution of vitamins, etc., in the feed into sea water is able to be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to feed for viewing flounder, which is intended for viewing flounder raised for the purpose of producing seeds.

(Conventional technology) Conventionally, in the production of flounder seedlings, large-sized sightseeing candidates with good growth are selected and raised from a large number of nurturing fish that have been growing for 3 to 4 years, and then fish to be used as parent fish are selected from among these. I made her lay eggs. Numerous factors are involved in raising these flounder species, such as food, temperature, light intensity, endocrine control, stress control, group structure, etc., but since it is possible to collect eggs by natural spawning, it is possible to collect high-quality eggs, that is, the total number of eggs collected. In order to collect a large number of eggs with excellent egg production, surfacing rate, fertilization rate, fertilization rate, etc., and no morphological abnormalities, it is said that the important issue is the content and form of the feed to be fed to flounder. .

The conventional feed for raising flounder is minced or shredded fresh or frozen fish such as horse mackerel, sardines, mackerel, and sand eel, or the feed is prepared by adding powdered feed to minced meat. Granulated moist feed, etc. have been used, and feed fortified with various vitamins, especially vitamin E, and minerals have been used, but it has not been possible to obtain a large quantity of eggs of satisfactory quality.

On the other hand, as for the use of phospholipids in fish feed, feed for young sweetfish is known in which phospholipids are added to artificially compounded feed (Japanese Patent Publication No. 61-27030); Feed for young flounder (Special Publication No. 61-43977) containing added lipids is known, but all of these are feeds for young flounder after they have matured.
The purpose of this method is to obtain fry that grow well, have fewer malformations, and have a high survival rate, and there have been no reports on feed for viewing.

(Problems to be solved by the invention) The broodstock fish used for producing flounder seedlings require a long training period before they can be used, and the labor involved in day-to-day breeding management is also large. A mixture of vitamins and minerals must be weighed and added. Therefore, eggs of good quality with high floating egg weight, fertilization rate, and fertilization rate, as well as eggs with no morphological abnormalities, should be added to each observed individual. desired.

The present invention attempts to solve these problems from the aspect of feed given to flounder viewing.

That is, as mentioned above, it is well known that 3 to 9% of phospholipids are added to the feed for young flounder fish, but it is surprising that adding phospholipids to the feed for flounder viewing to raise the flounder. In particular, the present inventors have discovered for the first time that it is possible to collect large quantities of eggs of high quality, that is, eggs with excellent total egg collection quantity, floating egg weight, fertilization rate, fertilization rate, etc., and without morphological abnormalities.

[Means for solving the problem]

The present invention has been made based on the above-mentioned discovery, and is a flounder viewing feed characterized by containing phospholipids.

The phospholipid used in the present invention is a major lipid that constitutes various membrane systems of cells that constitute living organisms, and is contained in, for example, egg yolks and soybeans. As the phospholipid used in the present invention, both glycerophospholipids and sphingophospholipids can be used, but phospholipids commonly called lecithins, such as egg yolk lecithin and soybean lecithin, are particularly preferably used.

These lecithins may be in the form of a paste or may be powdered lecithin obtained by powdering them by spray drying or the like.

The feed for flounder viewing that contains phospholipids may be a powdered or solid compound feed, or may contain wheat gluten, CMC, etc.
, sodium polyacrylate, sodium alginate,
Moist pellet feed prepared by mixing powdered moist feed containing a binder such as guar gum or alpha starch with live feed such as horse mackerel, sardines, mackerel, sand eel, shrimp, squid, etc. may also be used.

Next, the amount of the above-mentioned phospholipid added to the flounder viewing feed can be arbitrarily selected depending on the raw materials used, the blending ratio of moist powdered feed and live feed, etc., but if it is too small, it will be better than flounder viewing. I haven't been able to collect enough eggs,
Moreover, if the amount is too large, no significant effect can be expected, and the water quality may be contaminated by oil, so it is desirable that the amount is in the range of about 0.3 to 20%. In particular, considering the ease of crushing during the production of powdered feed for moisturizers and the ease of preparing moist pellets, it is desirable to mix about 2.5 to 3.5% of phospholipids in moist pellet feed for flounder viewing. .

Phospholipids may be added to flounder viewing feed at an appropriate step in the production of flounder viewing feed or moist powdered feed, or may be added during the preparation of moist pelleted feed. good.

〔Example〕

Powdered moist feed for marine fish consisting of 55% fishmeal, 24% wheat flour, 10% rice bran oil cake, 3% soybean oil cake, 2% corn gluten meal, 3% minerals, 2% vitamins, and 1% binder. soybean lecithin (lecithin content 70%)
) is added at 14.3%, and lecithin is approximately 10% in the powdered feed.
%.

Next, mince 2 parts of horse mackerel, 1 part of squid, and 1 part of shrimp, which are raw baits, with a meat chopper, and use the above powdered feed for moisturizer.
0.2 parts of commercially available vitamin-fortified feed for marine fish (Marine May, manufactured by Nippon Nosan Kogyo) and 1 part of commercially available useless multivitamins
A moist pelleted feed for flounder viewing with a diameter of 6 mm was obtained using moist pellets.

In addition, as a control feed, a lecithin-free control feed was obtained in the same manner as the moist pellet feed for flounder viewing, except that lecithin was not added to the moist powder feed for marine fish.

Next, we saw flounder (4 year old fish) with an average weight of 2421 g.
Divide the 6 fish into 2 sections of 28 fish each (16 females and 12 males).
Raised in an aquarium with a diameter of 8 m, depth of 2 m, and actual water volume of 60 ho.
The mice were fed the above feed and subjected to an egg laying test for about 3 months. The water used was filtered seawater, and the feeding amount was 0.3 to 1.5 kg/day.

Table 1 shows the results of egg collection from flounder observations 40 days, 48 days, and 59 days after the start of the test.

(Margin below overlapping) As can be seen from the above results, the eggs collected from the test plot fed the flounder observation feed of the present invention were more effective after 40 days and 48 days later than the eggs collected from the control plot fed the control diet. And after 59 days, the flounder observation feed of the present invention is excellent in the total egg collection amount, floating egg amount, floating egg weight, fertilization rate, beaker inhabitation rate, etc., and also has a low rate of malformation of larvae after becoming larval. It was clear that it was extremely useful in the production of flounder seedlings.

〔Effect of the invention〕

When the feed for flounder viewing of the present invention is fed to flounder viewing during seedling production, the total egg collection amount, floating egg weight, fertilization rate, and graying rate are excellent, and a large number of high-quality eggs without morphological abnormalities can be collected. There is an effect.

In addition, in the case of moist pellets, due to the contamination of phospholipids, substances that are normally easily eluted into seawater, such as vitamins, remain in the feed, which has the effect of reducing waste, and the breeding water is less contaminated, so during breeding. There are also effects such as bringing about favorable results when observing.

Claims (1)

[Claims] A feed for flounder broodstock characterized by containing phospholipids.