JP4796718B2 - Eel feed - Google Patents

Eel feed Download PDF

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Publication number
JP4796718B2
JP4796718B2 JP2001262836A JP2001262836A JP4796718B2 JP 4796718 B2 JP4796718 B2 JP 4796718B2 JP 2001262836 A JP2001262836 A JP 2001262836A JP 2001262836 A JP2001262836 A JP 2001262836A JP 4796718 B2 JP4796718 B2 JP 4796718B2
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Prior art keywords
eel
feed
powder
present
eels
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JP2003070426A (en
Inventor
高行 天野
康史 間田
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Marubeni Nisshin Feed Co Ltd
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Marubeni Nisshin Feed Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明はウナギ用飼料およびウナギの飼育方法に関する。より詳細には、本発明は、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる高品質のウナギを、成長の抑制、病気の発生、斃死などを生ずることなく、安全に且つ健全に生育・生産することのできるウナギ用飼料およびウナギの飼育方法に関する。
【0002】
【従来の技術】
近年、ウナギ需要の増加に伴って食用ウナギの養殖が盛んになっている。ウナギの美味しさの要因の一つとして「脂の乗り」が挙げられ、養殖ウナギにおいても、脂の乗り具合が品質の重要な評価基準となっている。
従来、養鰻用飼料中に魚油を添加することによって、養殖ウナギの筋肉中の脂質含量を増加させることが試みられてきたが、脂の乗りが十分ではなかったり、また逆に脂がしつこく感じられるなどの結果を生じており、その効果が十分ではなかった。
【0003】
【発明が解決しようとする課題】
本発明の目的は、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを生産できるウナギ用飼料およびウナギの飼育方法を提供することである。
【0004】
【課題を解決するための手段】
本発明者らは、上記の目的を達成すべく検討を重ねてきた。その結果、ウナギ用飼料中に、褐藻類および紅藻類から選ばれる少なくとも1種の海藻の粉末とオキアミ粉末を配合すると、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを生産できることを見出した。
さらに、本発明者らは、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを生産するためには、褐藻類および紅藻類から選ばれる少なくとも1種の海藻の粉末とオキアミ粉末を含有する前記飼料を、少なくともウナギの出荷80日前から出荷時までの期間にわたって継続して給与する、好ましくは全飼育期間にわたって給与してウナギを飼育することが望ましいことを見出し、それらの知見に基づいて本発明を完成した。
【0005】
すなわち、本発明は、
(1) 褐藻類および紅藻類から選ばれる少なくとも1種の海藻の粉末、並びにオキアミ粉末を含有することを特徴とするウナギ用飼料;
である。
そして、本発明は、
(2) ウナギ用飼料の全質量に対して、前記海藻の粉末を1〜5質量%およびオキアミ粉末を1〜5質量%の割合で含有する前記(1)のウナギ用飼料;
を好ましい態様として包含する。
さらに、本発明は、
(3) 前記(1)または(2)のウナギ用飼料を、少なくとも出荷80日前から出荷時までウナギに給与することを特徴とするウナギの飼育方法;
である。
【0006】
【発明の実施の形態】
本発明のウナギ用飼料では海藻粉末として、褐藻類および紅藻類から選ばれる少なくとも1種の海藻(以下「褐藻類および/または紅藻類の粉末」という)を用いる。
褐藻類としては、例えば、コンブ、ワカメ、アラメ、ヒジキ、カジメ、ホンダワラ、アスコフィラム・ノドサムなどを挙げることができ、また紅藻類としては、例えば、アマノリ、トサカノリ、テングサ、オゴノリ、フノリ、ツノマタなどを挙げることができる。本発明では、これらの海藻類の1種または2種以上の粉末を用いることができる。そのうちでも、アスコフィラム・ノドサムが、栄養面、供給量、価格などの点から好ましく用いられる。
海藻粉末の粒径は特に制限されないが、一般には、300〜2000μmの粉末が、飼料中への均一混合性などの点から好ましく用いられる。
【0007】
本発明のウナギ用飼料は、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを円滑に生産し得る点から、褐藻類および/または紅藻類の粉末を、ウナギ用飼料の全質量に基づいて1〜10質量%の割合で含有することが好ましく、1〜5質量%の割合で含有することがより好ましい。ウナギ用飼料における褐藻類および/または紅藻類の粉末の含有量が1質量%未満であると、養殖ウナギにおける脂がしつこくなり易い。一方、ウナギ用飼料における褐藻類および/または紅藻類の粉末の含有量が10質量%を超えると、養殖ウナギにおける脂の乗りが不十分になり易く、しかも飼育期間中に病気が発生することがある。
【0008】
本発明のウナギ用飼料に用いるオキアミ粉末は、分類学上はオキアミ目ユーファウジア科南極オキアミ(Euphausia superba)に属する南極オキアミを粉末化したものであり、通常、オキアミミールと称されている。
オキアミ粉末の粒径は特に制限されないが、一般には、500〜1500μmの粉末が、飼料中への均一混合性などの点から好ましく用いられる。
【0009】
本発明のウナギ用飼料は、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを円滑に生産し得る点から、オキアミ粉末を、ウナギ用飼料の全質量に基づいて1〜10質量%の割合で含有することが好ましく、1〜5質量%の割合で含有することがより好ましい。ウナギ用飼料におけるオキアミ粉末の含有量が1質量%未満であると、養殖ウナギにおける脂の乗りが不十分になり易い。一方、ウナギ用飼料におけるオキアミ粉末の含有量が10質量%を超えると、養殖ウナギにおける脂が多くなり、しかもしつこくなり易い。
【0010】
魚病の発生防止、養魚飼料の水分調整、保形などの目的で、養魚用飼料に海藻類を配合することが従来から知られている。
また、嗜好性の向上を目的として、ウナギ用飼料にオキアミ粉末を配合することも知られている(特開昭52−69797号公報など)。
しかしながら、褐藻類および/または紅藻類の粉末とオキアミ粉末の両方をウナギ用飼料に配合すると、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギが生産されることは従来知られておらず、本発明によってはじめて開発されたものである。
【0011】
本発明のウナギ用飼料は、ウナギ用の配合飼料に従来から用いられている飼料原料に、褐藻類および/または紅藻類の粉末とオキアミ粉末を配合することによって調製することができる。
一般的には、本発明のウナギ用飼料は、オキアミ粉末以外の魚介類粉末(以下単に「魚介類粉末」ということがある)をベース原料とし、これと共に褐藻類および/または紅藻類の粉末、オキアミ粉末、飼料を練餌にした際のまとまりを良くするために粘着剤、および必要に応じてアミノ酸やその塩、ビタミン類、ミネラル類等の栄養成分、界面活性剤、香辛料等の成分を含有する。
【0012】
ウナギ用飼料への褐藻類および/または紅藻類の粉末とオキアミ粉末の添加時期は特に制限されず、例えば、魚介類粉末、粘結剤、栄養成分、その他の成分を混合してウナギ用の配合飼料を調製する際に添加してもよいし、粉末状のウナギ用配合飼料に水や油などの液体を加えて練る際に添加してもよい。
【0013】
本発明のウナギ用飼料のベース原料をなす魚介類粉末としては、従来からウナギ用飼料として使用されている魚介類粉末のいずれもが使用でき、例えば、助宗ダラ、イカ、カレイ、イワシ、サバ、ニシン、サンマ、ホッケ、ホキ、メルルーサ、アサリ、カキ等の魚介類を原料とする魚粉を挙げることができる。これらの魚粉は、原料の入手法、原料成分等に応じて、通常、工船ミール(助宗ダラ)、北洋トロールミール(助宗ダラ、カレイ)、南方トロールミール(メルルーサ)、ホールミール(イワシ、サバ等)、ホキミール(ホキ)、イカミール、輸入ミール(片口イワシ、イワシ、ニシン等)、内地ミール(助宗ダラ、ホッケ、イワシ、サバ、サンマ等)等と称されている。
本発明のウナギ用飼料は、上記したような魚介類粉末のうちの1種類のみを含有していても、または2種以上の魚粉を含有していてもよい。ウナギによる嗜好性、経済性等の点からは、複数の魚粉を混合使用するのが好ましく、特に、工船ミール、ホキミールおよびホールミールを併用するのがよい。
魚介類粉末の含有量は、魚介類粉末の種類、ウナギの月例などに応じて変わり得るが、栄養価、経済性、粘結性などの点から、本発明のウナギ用飼料は、一般的に、ウナギ用飼料の全質量に基づいて、魚介類粉末を60〜75質量%の割合で含有することが好ましく、65〜70質量%の割合で含有することがより好ましい。
【0014】
本発明のウナギ用飼料のまとまりを良くするための上記した粘着剤としては、例えば、α化馬鈴薯澱粉、α化タピオカ澱粉などのα化澱粉、ポリアクリル酸ナトリウム、グアガム、アルギン酸ナトリウム、キサンタンガム、カルボキシメチルセルース、グルテンなどを挙げることができる。本発明のウナギ用飼料では、前記した粘着剤のうちの1種または2種以上を用いることができる。そのうちでも、粘着剤としては、粘結性、価格などの点から、α化馬鈴薯澱粉、α化タピオカ澱粉などのα化澱粉が好ましく用いられる。
粘着剤の含有量は、粘着剤の種類、魚介類粉末の種類、ウナギの月例などに応じて変わり得るが、栄養価、経済性、粘結性などの点から、本発明のウナギ用飼料は、一般的に、ウナギ用飼料の全質量に基づいて、粘着剤を15〜25質量%の割合で含有することが好ましく、18〜23質量%の割合で含有することがより好ましい。
【0015】
本発明のウナギ用飼料の形態は、粉末状、ペレット状などのいずれであってもよいが、粉末状であることが好ましい。
本発明のウナギ用飼料が粉末状である場合は、ウナギ用飼料粉末に水、油などの液体を加えて混練し練餌にして、ウナギに給与することが、摂餌性などの点から好ましい。
粉末状のウナギ用飼料に水、油などの液体を加えて練餌にするに当たっては、ウナギ用飼料粉末100質量部に対して、水を100〜130質量部、油を0〜15質量部(液体の合計量100〜145質量部)の割合で加えることが、練餌の取り扱い性、給与の容易性、摂餌性、栄養面などの点から好ましい。
【0016】
脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる養殖ウナギを生産するためには、褐藻類および/または紅藻類の粉末とオキアミ粉末を含有する本発明のウナギ用飼料を、少なくとも出荷80日前から出荷時までウナギに継続して給与することが好ましい。そのうちでも、本発明のウナギ用飼料は、出荷150日前から出荷時まで継続して給与することがより好ましく、全飼育期間にわたって継続して給与することが更に好ましい。
【0017】
【実施例】
以下に本発明を実施例などにより具体的に説明するが、本発明は以下の例により何ら限定されない。
【0018】
《実施例1》
(1) 魚粉、α化馬鈴薯澱粉、海藻粉末(アスコフィラム・ノドサムを主体とする海藻粉末)、オキアミミール、ミネラルミックスおよびビタミンミックスを用いて、以下の表2に示す粉末状のウナギ用飼料をそれぞれ調製した。
(2) 体重76g前後のウナギを各区45匹ずつ4区準備し、各区のウナギを屋内に設置したFRP製水槽(内容量1400リットル)に入れ、平均水温約30℃の淡水を用いて、84日間にわたって流水飼育した。この飼育期間中に、上記(1)で調製したウナギ用飼料100質量部に水130質量部および魚油10質量部を混合して自動練機によって練って練餌を調製し、その練餌を84日間継続して給与して自由摂取させた。
(3) 上記(2)の飼育期間中、第1区〜第4区のいずれにおいても、寄生虫や病気の発生はなく、ウナギの斃死もなかった。
(4) 飼育終了時(飼育84日目)に、各区のウナギの体重を測定してその平均体重を測定したところ、以下の表2に示すとおりであった。
また、各区のウナギ10匹(ランダム)について筋肉中の脂質含量を測定してその平均値を求めたところ、下記の表2に示すとおりであった。
なお、ウナギの筋肉中の脂質含量は、ジエチルエーテル法によって定量した。
【0019】
(5) さらに、飼育終了時(飼育84日目)に、各区のウナギ10匹(ランダム)を活ジメして蒲焼きにし、10名のパネラーが食し、下記の表1に示す評価基準にしたがって食感を評価してもらって平均値を採り、その小数点第1位を四捨五入したったところ、下記の表2に示すとおりであった。
【0020】
【表1】

Figure 0004796718
【0021】
【表2】
Figure 0004796718
【0022】
上記の表2の結果から、第2区(本発明区)のウナギは、褐藻類および/または紅藻類の粉末とオキアミ粉末を含有する本発明のウナギ用飼料を給与して飼育したことにより、褐藻類および/または紅藻類の粉末とオキアミ粉末のいずれをも含有しないウナギ用飼料を給与してなる第1区(対照区)のウナギに比べて、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感にきわめて優れていることがわかる。
これに対して、第3区(比較例区)のウナギは、褐藻類および/または紅藻類の粉末のみを含有するウナギ用飼料を給与して飼育したことにより、成長は改善されたものの、食感は第1区と変わらず、第2区(本発明区)に比べて劣っている。
また、第4区(比較例区)のウナギは、オキアミ粉末のみを含有するウナギ用飼料を給与して飼育したことにより、食感は多少改善されたものの、第2区(本発明区)に比べて食感の改善効果が低く、しかも成長が抑制され、第2区(本発明区)に比べて劣っている。
【0023】
【発明の効果】
本発明のウナギ用飼料を用いてウナギを飼育すると、脂の乗りが良く、しかも脂がしつこくなく、身が柔らかくて、肉質の食感に優れる高品質のウナギを円滑に生産することができる。
本発明のウナギ用飼料を用いてウナギを飼育すると、成長の抑制、病気の発生、斃死などを生ずることなく、ウナギを安全に且つ健全に生育させることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an eel feed and an eel breeding method. More specifically, the present invention produces a high quality eel that is well-greased, non-greasy, soft and fleshy, resulting in growth inhibition, disease occurrence, and dying. The present invention relates to an eel feed and an eel breeding method that can be safely and soundly grown and produced without any problems.
[0002]
[Prior art]
In recent years, edible eel farming has become popular with the increase in eel demand. One of the factors that contribute to the taste of eels is “fat riding”, and in farmed eels, the level of fat riding is an important evaluation standard for quality.
In the past, attempts have been made to increase the lipid content in the muscles of cultured eels by adding fish oil to the sericulture feed, but the riding of the fat is not sufficient, and conversely, the fat feels persistent. As a result, the effect was not sufficient.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a feed for eel and a method for raising eel that can produce a cultured eel that is well-fat, has a solid fat, is soft, and has an excellent meat texture.
[0004]
[Means for Solving the Problems]
The present inventors have repeatedly studied to achieve the above object. As a result, when eel feed is mixed with at least one kind of seaweed powder and krill powder selected from brown algae and red algae, the fat ride is good, the fat is not persistent, the body is soft, and the meat quality We found that cultured eels with excellent texture can be produced.
Furthermore, the present inventors have produced at least one selected from brown algae and red algae in order to produce cultured eels that have good fat riding, are not fat persistent, are soft, and have an excellent meat texture. It is desirable to feed the above-mentioned feed containing seed seaweed powder and krill powder continuously for at least 80 days before the shipment of eels, preferably over the whole breeding period, to raise eels. The present invention was completed based on these findings.
[0005]
That is, the present invention
(1) An eel feed comprising at least one seaweed powder selected from brown algae and red algae, and krill powder;
It is.
And this invention,
(2) The eel feed according to (1) above, containing 1-5% by mass of the seaweed powder and 1-5% by mass of the krill powder with respect to the total mass of the eel feed;
Is included as a preferred embodiment.
Furthermore, the present invention provides
(3) An eel breeding method, characterized in that the eel feed of (1) or (2) is fed to an eel from at least 80 days before shipment to the time of shipment;
It is.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the eel feed of the present invention, at least one seaweed selected from brown algae and red algae (hereinafter referred to as “brown algae and / or red algae powder”) is used as the seaweed powder.
Examples of brown algae include kombu, wakame, arame, hijiki, kajime, honda walla, ascophilum nodsum, etc. Can be mentioned. In the present invention, one or more powders of these seaweeds can be used. Among them, Ascophyram nodsum is preferably used in terms of nutritional aspect, supply amount, price, and the like.
The particle size of the seaweed powder is not particularly limited, but generally, a powder of 300 to 2000 μm is preferably used from the viewpoint of uniform mixing in the feed.
[0007]
The feed for eels of the present invention has a good fat ride, is not fat persistent, is soft, and can smoothly produce cultured eels with excellent meat texture, so that brown algae and / or red algae can be produced. It is preferable to contain a powder in the ratio of 1-10 mass% based on the total mass of the feed for eels, and it is more preferable to contain it in the ratio of 1-5 mass%. If the content of brown algae and / or red algae powder in the eel feed is less than 1% by mass, fat in the cultured eel tends to be persistent. On the other hand, if the content of brown algae and / or red algae powder in the eel feed exceeds 10% by mass, the riding of fat in the cultured eel tends to be insufficient, and disease may occur during the breeding period. is there.
[0008]
The krill powder used in the feed for eels of the present invention is a powder of Antarctic krill belonging to Euphorius superba in terms of taxonomy, and is usually referred to as krill meal.
The particle size of the krill powder is not particularly limited, but generally, a powder of 500 to 1500 μm is preferably used from the viewpoint of uniform mixing in the feed.
[0009]
The eel feed of the present invention has good fat riding, is not fat persistent, is soft, and can smoothly produce cultured eels with excellent meat texture. It is preferable to contain in the ratio of 1-10 mass% based on the total mass, and it is more preferable to contain in the ratio of 1-5 mass%. If the content of krill powder in the eel feed is less than 1% by mass, the riding of fat in the cultured eel tends to be insufficient. On the other hand, if the content of the krill powder in the eel feed exceeds 10% by mass, the fat in the cultured eel increases and it tends to be persistent.
[0010]
For the purpose of preventing the occurrence of fish diseases, adjusting the moisture content of fish feed, and retaining the shape of the fish feed, it has been conventionally known to add seaweed to the fish feed.
It is also known to add krill powder to eel feed for the purpose of improving palatability (Japanese Patent Laid-Open No. 52-69797).
However, when both brown algae and / or red algae powder and krill powder are added to the eel feed, a cultured eel that has good fat riding, is not persistent in fat, is soft and has a fleshy texture. It has not been known to be produced in the past, and was developed for the first time by the present invention.
[0011]
The eel feed of the present invention can be prepared by blending brown algae and / or red algae powder and krill powder with feed raw materials conventionally used in eel blended feed.
In general, the eel feed of the present invention is based on fish and shellfish powder other than krill powder (hereinafter sometimes referred to simply as “fish and shellfish powder”), and together with this, brown algae and / or red algae powder, Contains krill powder, pressure-sensitive adhesive to improve cohesion when feed is mixed, and nutritional components such as amino acids and their salts, vitamins and minerals, surfactants and spices as necessary To do.
[0012]
The timing of adding brown algae and / or red algae powder and krill powder to eel feed is not particularly limited. For example, seafood powder, caking additive, nutritional ingredients, and other ingredients are mixed for eel It may be added when preparing the feed, or may be added when adding a liquid such as water or oil to the powdered eel blended feed and kneading.
[0013]
As the seafood powder that forms the base material of the eel feed of the present invention, any of the seafood powders conventionally used as eel feed can be used, for example, Susumu Dara, Squid, Flatfish, Sardine, Mackerel, Mention may be made of fish meal made from seafood such as herring, saury, hockey, hoki, hake, clams and oysters. These fish meals are usually made according to the method of obtaining the raw materials, ingredients, etc., and the craft ship meal (Kazumune Dara), the North Sea Troll Meal (Kangjong Tara, Kalei), the Southern Troll Meal (Merusa), Whole Meal (sardine, mackerel) Etc.), Hokimeal (Hoki), squid meal, imported meal (single-mouthed sardine, sardine, herring, etc.), inland meal (Assistance Dara, Hokke, sardine, mackerel, saury, etc.).
The eel feed of the present invention may contain only one kind of the above-described seafood powder, or may contain two or more kinds of fish meal. From the viewpoints of palatability and economical efficiency of eels, it is preferable to use a mixture of a plurality of fish meals, and in particular, it is preferable to use a combination of a craft ship meal, hoki meal and whole meal.
The content of seafood powder may vary depending on the type of seafood powder, monthly eel, etc., but from the viewpoint of nutritional value, economy, caking property, etc., the eel feed of the present invention is generally Based on the total mass of the eel feed, it is preferable to contain the seafood powder at a rate of 60 to 75% by mass, and more preferably at a rate of 65 to 70% by mass.
[0014]
Examples of the above-mentioned pressure-sensitive adhesive for improving the unity of the eel feed of the present invention include pre-gelatinized starch such as pregelatinized potato starch and pregelatinized tapioca starch, sodium polyacrylate, guar gum, sodium alginate, xanthan gum, carboxy Examples thereof include methylcellulose and gluten. In the eel feed of the present invention, one or more of the aforementioned adhesives can be used. Among them, α-starch such as pregelatinized potato starch and pregelatinized tapioca starch is preferably used as the pressure-sensitive adhesive from the viewpoint of caking property and cost.
The content of the pressure-sensitive adhesive can vary depending on the type of pressure-sensitive adhesive, the type of seafood powder, the monthly eel, etc.In terms of nutritional value, economy, caking property, etc., the eel feed of the present invention is In general, the pressure-sensitive adhesive is preferably contained in a proportion of 15 to 25% by mass, more preferably 18 to 23% by mass, based on the total mass of the eel feed.
[0015]
The form of the eel feed of the present invention may be powdery or pellety, but is preferably powdery.
When the eel feed of the present invention is in a powder form, it is preferable from the viewpoint of feedability and the like to add a liquid such as water or oil to the eel feed powder, knead and feed it to the eel. .
When adding a liquid such as water or oil to powdered eel feed to make a paste, 100 to 130 parts by weight of water and 0 to 15 parts by weight of oil (100 parts by weight of oil for eel feed powder) It is preferable to add at a ratio of 100 to 145 parts by mass of the total amount of liquid from the viewpoints of handling of the mixed bait, ease of feeding, feeding, nutrition, and the like.
[0016]
In order to produce a cultured eel that has good fat riding, is not fat persistent, is soft, and has an excellent meat texture, it contains brown alga and / or red algae powder and krill powder. It is preferable to continuously feed the eel feed to the eel from at least 80 days before shipment to the time of shipment. Among them, it is more preferable to continuously feed the eel feed of the present invention from 150 days before shipment to the time of shipment, and it is even more preferable to continuously feed it throughout the entire breeding period.
[0017]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples and the like, but the present invention is not limited to the following examples.
[0018]
Example 1
(1) Fish powder, pregelatinized potato starch, seaweed powder (seaweed powder mainly composed of Ascophyllum nodosum), krill meal, mineral mix and vitamin mix, respectively, the powdered eel feed shown in Table 2 below. Prepared.
(2) Prepare 45 eels with a body weight of around 76g in each 4 wards, put the eels in each ward into the FRP water tank (contents 1400 liters) installed indoors, and use fresh water with an average water temperature of about 30 ° C. The animals were kept under running water for a day. During this breeding period, 100 parts by weight of the eel feed prepared in (1) above was mixed with 130 parts by weight of water and 10 parts by weight of fish oil, and kneaded with an automatic kneader to prepare a paste. Salary was continued for a day and allowed to freely take.
(3) During the breeding period of (2) above, no parasites or diseases were observed in any of the first to fourth zones, and there was no eel drowning.
(4) At the end of the breeding (day 84 of breeding), the weight of eels in each section was measured and the average weight was measured. The results were as shown in Table 2 below.
Moreover, when the lipid content in a muscle was measured about 10 eels (random) of each section and the average value was calculated | required, it was as showing in following Table 2.
The lipid content in eel muscle was quantified by the diethyl ether method.
[0019]
(5) Further, at the end of the breeding (day 84 of breeding), 10 eels (random) in each ward were squeezed and grilled, and 10 panelists ate, and they were eaten according to the evaluation criteria shown in Table 1 below. The average value was obtained by evaluating the feeling, and the first decimal place was rounded off, and as shown in Table 2 below.
[0020]
[Table 1]
Figure 0004796718
[0021]
[Table 2]
Figure 0004796718
[0022]
From the results of Table 2 above, the eels of the second section (the present invention section) were fed and fed the eel feed of the present invention containing brown algae and / or red algae powder and krill powder, Compared to the eels in the first section (control section), which are fed eel feed that does not contain either brown algae and / or red algae powders and krill powder, the fat ride is better and the fats are less persistent. , The body is soft and the meat texture is very good.
In contrast, the eels of the third ward (comparative example ward) were fed with eel feed containing only brown algae and / or red algae powder. The feeling is the same as the first ward and is inferior to the second ward (present invention ward).
Moreover, although the eel of the 4th ward (comparative example ward) was raised by feeding the eel feed containing only krill powder, the texture was slightly improved, but in the 2nd ward (invention ward) Compared to the second section (the present invention section), the texture improvement effect is lower than that of the second section (the present invention section).
[0023]
【The invention's effect】
When eels are bred using the eel feed of the present invention, it is possible to smoothly produce high-quality eels that have good fat riding, are not fat persistent, are soft, and have excellent meat texture.
When eels are bred using the eel feed of the present invention, eels can be grown safely and soundly without causing growth inhibition, disease occurrence, or drowning.

Claims (3)

褐藻類および紅藻類から選ばれる少なくとも1種の海藻の粉末、並びにオキアミ粉末を含有することを特徴とするウナギ用飼料。An eel feed comprising at least one seaweed powder selected from brown algae and red algae, and krill powder. ウナギ用飼料の全質量に対して、前記海藻の粉末を1〜5質量%およびオキアミ粉末を1〜5質量%の割合で含有する請求項1に記載のウナギ用飼料。The eel feed according to claim 1, comprising 1-5% by mass of the seaweed powder and 1-5% by mass of the krill powder with respect to the total mass of the eel feed. 請求項1または2のウナギ用飼料を、少なくとも出荷80日前から出荷時までウナギに給与することを特徴とするウナギの飼育方法。An eel breeding method, wherein the eel feed according to claim 1 or 2 is fed to the eel from at least 80 days before shipment to the shipment.
JP2001262836A 2001-08-31 2001-08-31 Eel feed Expired - Lifetime JP4796718B2 (en)

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WO2011006261A1 (en) * 2009-07-17 2011-01-20 Ocean Harvest Technology (Canada) Inc. Natural and sustainable seaweed formula that replaces synthetic additives in fish feed

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JPS5269797A (en) * 1975-12-10 1977-06-10 Takasago Perfumery Co Ltd Feed for culturing eels
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JPH07108859B2 (en) * 1992-06-08 1995-11-22 三菱化学株式会社 Drugs for preventing fish infectious diseases
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