JP7254275B2 - Farmed fish feed and farmed fish farming method - Google Patents

Farmed fish feed and farmed fish farming method Download PDF

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JP7254275B2
JP7254275B2 JP2018171422A JP2018171422A JP7254275B2 JP 7254275 B2 JP7254275 B2 JP 7254275B2 JP 2018171422 A JP2018171422 A JP 2018171422A JP 2018171422 A JP2018171422 A JP 2018171422A JP 7254275 B2 JP7254275 B2 JP 7254275B2
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浩史 山下
進一 佐々木
権一 木和田
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、養殖魚用の飼料及び養殖魚の養殖方法に関する。 TECHNICAL FIELD The present invention relates to a feed for farmed fish and a farming method for farmed fish.

従来から、ブリ等の養殖魚の養殖が盛んに行われており、ブリは、脂の乗りが良く、大変美味であるため、海外市場においても非常に評価が高い。しかし、通常、ブリは、締め後48時間程度で、肉色の変化、特に血合筋の鮮赤色から褐色への変色(褐変)が顕著となり、商品価値が大きく低下してしまう。 Traditionally, aquaculture of farmed fish such as yellowtail has been actively carried out, and yellowtail has a good fat content and is very delicious, so it is highly evaluated in overseas markets. However, in general, about 48 hours after tightening, the change in meat color of yellowtail, especially the color change from bright red to brown (browning) of the bloody muscle, becomes remarkable, and the commercial value is greatly reduced.

また、近年、養殖魚の肉質を改善したり、養殖魚の成長を促進させたりするために、様々な飼料が開発されており、養殖魚の水揚げ加工後の褐変を抑えるための飼料も提供されている。 In addition, in recent years, various feeds have been developed to improve the meat quality of farmed fish and promote the growth of farmed fish.

例えば、下記特許文献1,2には、養殖魚に給餌することで、水揚げ加工後の褐変を抑制することのできる養殖魚用飼料が開示されている。 For example, Patent Literatures 1 and 2 below disclose farmed fish feed that can suppress browning after landing and processing by feeding farmed fish.

特開2016-149964号公報JP 2016-149964 A 特開2018-29616号公報JP 2018-29616 A

特許文献1,2に開示された養殖魚用飼料は、メロン果実、柑橘類の果実、トウガラシ等を含有する飼料であるが、入手の容易性やコスト等の問題もあり、養殖魚に与えることで褐変抑制効果のある新たな養殖魚用飼料の開発が引き続き求められている。 The farmed fish feeds disclosed in Patent Documents 1 and 2 are feeds containing melon fruits, citrus fruits, hot peppers, etc., but there are also problems such as availability and cost, and it is difficult to give them to farmed fish. Development of a new feed for farmed fish that has an effect of suppressing browning is continuously demanded.

本発明は、このような課題に鑑みてなされたものであり、養殖魚の水揚げ後の褐変を強く抑制することのできる新たな養殖魚用飼料及び養殖魚の養殖方法を提供することを目的とする。 The present invention has been made in view of such problems, and an object of the present invention is to provide a new feed for farmed fish and a method for cultivating farmed fish that can strongly suppress the browning of farmed fish after landing.

上記課題を解決するために、本発明に係る養殖魚用飼料は、カカオバターを質量比で1.5質量%以上5質量%以下含有し、養殖魚の水揚げ加工後の褐変を抑制することを特徴とする。 In order to solve the above problems, the feed for farmed fish according to the present invention contains 1.5% by mass or more and 5% by mass or less of cacao butter in terms of mass ratio , and is characterized by suppressing browning of farmed fish after landing processing. .

また、本発明に係る養殖魚の養殖方法は、カカオバターを質量比で1.5質量%以上5質量%以下含有し、養殖魚の水揚げ加工後の褐変を抑制する養殖魚用飼料を、養殖魚に所定量与えるカカオバター給餌工程であって、少なくとも10日以上に分けて、前記養殖魚の水揚げ直前の二ヶ月以内に行われるカカオバター給餌工程を備えることを特徴とする。 Further, in the method for cultivating farmed fish according to the present invention, a predetermined amount of farmed fish feed containing 1.5% by mass or more and 5% by mass or less of cacao butter and suppressing browning after landing processing of farmed fish is applied to farmed fish. The cacao butter feeding step is characterized by comprising a cacao butter feeding step which is divided into at least 10 days and performed within two months immediately before landing of the farmed fish.

本発明に係る養殖魚用飼料によれば、養殖魚の飼料として養殖魚に給餌することで、水揚げ後の養殖魚の褐変を大きく抑制した養殖魚を提供することができる。 According to the feed for farmed fish according to the present invention, by feeding farmed fish as a feed for farmed fish, it is possible to provide farmed fish in which browning of farmed fish after landing is greatly suppressed.

また、本発明に係る養殖魚の養殖方法によれば、水揚げ後の褐変を大きく抑制した養殖魚を提供することができる。 Further, according to the method for cultivating cultured fish according to the present invention, it is possible to provide cultured fish in which browning after landing is greatly suppressed.

図1は、本発明の実施形態に係る飼育試験1(給餌回数20回)の各試験区の肉色変化の測定結果を示す図である。FIG. 1 is a diagram showing measurement results of changes in meat color in each test group in breeding test 1 (20 times of feeding) according to an embodiment of the present invention. 図2は、本発明の実施形態に係る飼育試験2(給餌回数5回)の各試験区の肉色変化の測定結果を示す図である。FIG. 2 is a diagram showing measurement results of changes in meat color in each test group in breeding test 2 (five times of feeding) according to the embodiment of the present invention. 図3は、本発明の実施形態に係る飼育試験2(給餌回数10回)の各試験区の肉色変化の測定結果を示す図である。FIG. 3 is a diagram showing measurement results of changes in meat color in each test group in breeding test 2 (10 times of feeding) according to the embodiment of the present invention. 図4は、本発明の実施形態に係る飼育試験2(給餌回数20回)の各試験区の肉色変化の測定結果を示す図である。FIG. 4 is a diagram showing measurement results of changes in meat color in each test group in breeding test 2 (feeding frequency: 20 times) according to the embodiment of the present invention.

以下、本発明の実施の形態について説明する。本実施形態では、ブリの養殖魚用飼料(モイストペレット)にチョコレートやカカオバターを混ぜた場合について説明する。カカオバターやカカオバターを含むチョコレートには、カカオ豆由来のポリフェノールであるカカオポリフェノールが含まれており、これらを養殖魚用飼料に混ぜることで、締めた後の養殖魚の褐変を大きく抑制することができる。 BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In the present embodiment, a case in which chocolate and cacao butter are mixed with yellowtail farmed fish feed (moist pellets) will be described. Cocoa butter and chocolate containing cocoa butter contain cacao polyphenols, which are polyphenols derived from cacao beans. By mixing these with feed for farmed fish, browning of farmed fish after tightening can be greatly suppressed. can.

(飼育試験1)
まず、本実施形態に係る実施例1を用いた飼育試験1について説明する。表1は、飼育試験1で用いた養殖魚用飼料の実施例1、比較例1及び比較例2の組成を示す。実施例1は、チョコレートを含有する飼料、比較例1は、伊予柑果皮を含有する飼料、比較例2は、チョコレート等の添加物の無い従来の一般的な養殖魚用飼料である。
(Breeding test 1)
First, breeding test 1 using Example 1 according to the present embodiment will be described. Table 1 shows the composition of Example 1, Comparative Example 1 and Comparative Example 2 of feed for cultured fish used in breeding test 1. Example 1 is a feed containing chocolate, Comparative Example 1 is a feed containing Iyokan pericarp, and Comparative Example 2 is a conventional general farmed fish feed without additives such as chocolate.

Figure 0007254275000001
Figure 0007254275000001

実施例1は、質量比で、配合飼料(粉末)を40質量%、生魚(イカナゴ)を40質量%、ビタミン剤(SDミライム)を2質量%、フィードオイル(魚油)を8質量%、チョコレートを10質量%混合して生成したモイストペレットである。ここで、チョコレートは、カカオバター、砂糖、小麦粉等を混合したものであり、質量比で30%のカカオバターを含んでいる。 Example 1 contains 40% by mass of mixed feed (powder), 40% by mass of raw fish (sand eel), 2% by mass of vitamin preparation (SD Mirame), 8% by mass of feed oil (fish oil), and chocolate. It is a moist pellet produced by mixing 10% by mass. Here, chocolate is a mixture of cocoa butter, sugar, wheat flour, etc., and contains 30% by mass of cocoa butter.

比較例1は、実施例1のチョコレートの代わりに、伊予柑果汁を絞った後の残りの果皮をそのまま粉砕して混ぜたものである。比較例1は、質量比で、配合飼料(粉末)を40質量%、生魚(イカナゴ)を40質量%、ビタミン剤(SDスライム)を2質量%、フィードオイル(魚油)を8質量%、伊予柑果皮を10質量%混合して生成したモイストペレットである。 In Comparative Example 1, instead of the chocolate of Example 1, the remaining peel after squeezing the Iyokan fruit juice was crushed and mixed as it was. In Comparative Example 1, the mass ratio is 40% by mass of mixed feed (powder), 40% by mass of raw fish (sand eel), 2% by mass of vitamin preparation (SD slime), 8% by mass of feed oil (fish oil), Iyo Moist pellets produced by mixing 10% by mass of citrus peel.

比較例2は、実施例1及び比較例1のような添加物のない従来の一般的な養殖魚用飼料であり、質量比で、配合飼料(粉末)を40質量%、生魚(イカナゴ)を50質量%、ビタミン剤(SDスライム)を2質量%、フィードイル(魚油)を8質量%混合して生成したモイストペレットである。 Comparative Example 2 is a conventional general farmed fish feed without additives such as those in Example 1 and Comparative Example 1, and contains 40% by mass of compound feed (powder) and raw fish (sand eel) in mass ratio. Moist pellets produced by mixing 50% by mass, 2% by mass of vitamin preparation (SD slime), and 8% by mass of feedil (fish oil).

本飼育試験1では、約5.5kgブリ1歳魚を20匹ずつ3つの試験区に分け、各試験区において、実施例1、比較例1,2の養殖魚用飼料を、1日1回ずつ4週間にわたって合計20回(1週間あたり約5回)給餌した。給餌量は、各試験区において2.6kg/回とし、1匹あたりの給餌量/回は、質量比で魚体重の2%に相当する。なお、チョコレートを混合した実施例1の養殖魚用飼料であっても、ブリの飼料に対する食いつきが低下することはなかった。 In this breeding test 1, about 5.5 kg 1-year-old yellowtail was divided into 3 test groups of 20 each, and in each test group, the farmed fish feeds of Example 1 and Comparative Examples 1 and 2 were fed once a day. A total of 20 feedings (approximately 5 times per week) were fed over 4 weeks. The feeding amount was 2.6 kg/time in each test group, and the feeding amount/time for one fish corresponded to 2% of the fish body weight in mass ratio. Even with the farmed fish feed of Example 1 mixed with chocolate, yellowtail's appetite for the feed did not decrease.

また、本飼育試験1では、給餌開始後、4週目(給餌回数20回)に水揚げ(サンプリング数3匹)した後、ブリを切り身にして約4℃の冷蔵保存条件下で保存し、血合筋の色の変化を測定した。具体的には、色彩色差計(コニカミノルタ製:CR-13)を用いてLab値を測定し、褐変の度合いをb/a値で評価した。測定は、水揚げ後、7日経過するまで、6日目を除いて毎日行った。 In addition, in this breeding test 1, after the 4th week (20 times of feeding) after the start of feeding, after landing (3 fish sampled), yellowtail was cut into fillets and stored under refrigerated storage conditions at about 4 ° C. Changes in muscle color were measured. Specifically, the Lab value was measured using a colorimeter (manufactured by Konica Minolta: CR-13), and the degree of browning was evaluated by the b/a value. Measurements were taken every day until 7 days after landing, except for the 6th day.

続いて、本飼育試験1の結果について、図1を参照しながら説明する。図1は、横軸が水揚げからの経過日数(日)、縦軸がb/a値を示しており、水揚げしたブリの色変化の測定結果を示している。b/a値は、ブリの血合筋の褐変が進むにつれて大きくなる値であり、一般に生食の目安は、b/a値が0.8以下であると言われている。 Next, the results of this breeding test 1 will be described with reference to FIG. In FIG. 1, the horizontal axis indicates the number of days (days) elapsed since the landing, and the vertical axis indicates the b/a value, showing the measurement results of the color change of the landed yellowtail. The b/a value is a value that increases with the progress of browning of the chiai muscle of yellowtail, and it is generally said that a b/a value of 0.8 or less is a guideline for eating raw.

図1に示すように、実施例1及び比較例1,2の全ての試験区において、水揚げ加工後の日数が経過するにつれてb/a値が上昇しているが、b/a値が0.8を越えるのは、実施例1では水揚げから7日目以降であるのに対して、比較例1では5日目以降、比較例2では2日目以降となっている。 As shown in FIG. 1, in all test plots of Example 1 and Comparative Examples 1 and 2, the b/a value increases as the number of days after the landing process elapses, but the b/a value is less than 0.8. In Example 1, it exceeds 7 days after landing, whereas in Comparative Example 1 it exceeds 5 days and in Comparative Example 2 it exceeds 2 days.

このように、実施例1の養殖魚用飼料を与えられたブリは、水揚げ加工後、少なくとも5日目までは生食に適した肉色(鮮赤色)を呈しており、大きく褐変を抑えることができている。 Thus, the yellowtail fed with the farmed fish feed of Example 1 exhibited a meat color (bright red) suitable for eating raw until at least 5 days after landing, and browning could be greatly suppressed. ing.

血合筋の褐変は、血合筋に含まれるミオグロビンが酸化反応によりメトミオグロビンに変化(メト化)することにより発生する。この化学反応は、酸化反応の一種であるため、抗酸化物質が血合筋の組織内に一定量蓄積することで抑えることができる。 Browning of Chiai muscle occurs when myoglobin contained in Chiai muscle changes to metmyoglobin (metmyoglobin) through an oxidation reaction. Since this chemical reaction is a kind of oxidation reaction, it can be suppressed by accumulating a certain amount of antioxidant substances in the tissue of the blood vessel.

実施例1の養殖魚用飼料に含まれるチョコレートには、カカオバターが含まれており、このカカオバターに含まれるカカオポリフェノールは強い抗酸化作用を有している。よって、飼料としてブリの体内に取り込まれたカカオポリフェノールが血合筋の組織内に蓄積されることで、褐変が強く抑制されていると考えられる。 The chocolate contained in the farmed fish feed of Example 1 contains cacao butter, and the cacao polyphenol contained in this cacao butter has a strong antioxidant effect. Therefore, it is thought that cacao polyphenols taken into the bodies of yellowtails as feed are accumulated in the tissues of the bloody muscle, thereby strongly suppressing browning.

なお、比較例1においても、比較例2と比べて褐変が大きく抑制されているが、これは、伊予柑果皮に含まれるβ-クリプトキサンチンの抗酸化作用によるものと考えられる。 Also in Comparative Example 1, browning was greatly suppressed as compared with Comparative Example 2. This is considered to be due to the antioxidant action of β-cryptoxanthin contained in the Iyokan peel.

ここで、食用魚の国内流通を見ると、水揚げから3~4日程度で最終消費者まで至るケースが多く、3日以上褐変を大きく抑えることができれば、市場価値を大きく向上させることができ、5日以上褐変を抑えることができれば、海外市場での流通にも大きく貢献することができる。 Here, looking at the domestic distribution of edible fish, in many cases, it takes about 3 to 4 days from landing to reach the final consumer. If browning can be suppressed for more than one day, it can greatly contribute to distribution in overseas markets.

(飼育試験2)
続いて、本実施形態に係る実施例1,2を用いた飼育試験2について説明する。表2は、飼育試験2で用いた実施例1、実施例2及び比較例2の組成を示す。実施例2は、カカオバターを含有する飼料であり、実施例1及び比較例2は、上述した飼育試験1で用いた実施例1及び比較例2の飼料と同じである。
(Breeding test 2)
Subsequently, breeding test 2 using Examples 1 and 2 according to the present embodiment will be described. Table 2 shows the composition of Example 1, Example 2 and Comparative Example 2 used in breeding test 2. Example 2 is a feed containing cacao butter, and Example 1 and Comparative Example 2 are the same as the feed of Example 1 and Comparative Example 2 used in the breeding test 1 described above.

Figure 0007254275000002
Figure 0007254275000002

実施例2は、質量比で、配合飼料(粉末)を40質量%、生魚(イカナゴ)を40質量%、ビタミン剤(SDスライム)を2質量%、フィードオイル(魚油)を8質量%、カカオバターを10質量%混合して生成したモイストペレットである。 In Example 2, the mass ratio is 40% by mass of mixed feed (powder), 40% by mass of raw fish (sand eel), 2% by mass of vitamin preparation (SD slime), 8% by mass of feed oil (fish oil), and cacao. Moist pellets produced by mixing 10% by mass of butter.

本飼育試験2では、約6.5kgのブリ2歳魚を20匹ずつ3つの試験区に分け、各試験区において、実施例1,2、比較例2の養殖魚用飼料を、1日1回ずつ、4週間にわたって合計20回(1週間あたり約5回)の給餌を行った。給餌量は、各試験区において2.6kg/回とし、1匹あたりの給餌量/回は、質量比で魚体重の2%に相当する。なお、カカオバターを混合した実施例2の養殖魚用飼料であっても、ブリの飼料に対する食いつきが低下することはなかった。 In this breeding test 2, about 6.5 kg of 2-year-old yellowtail fish were divided into 3 test groups of 20 each, and in each test group, the farmed fish feeds of Examples 1 and 2 and Comparative Example 2 were fed once a day. Each was fed 20 times (approximately 5 times per week) over 4 weeks. The feeding amount was 2.6 kg/time in each test group, and the feeding amount/time for one fish corresponded to 2% of the fish body weight in mass ratio. Even with the farmed fish feed of Example 2 mixed with cacao butter, yellowtail's appetite for the feed did not decrease.

また、本飼育試験2では、給餌開始後、1週目(給餌回数5回)、2週目(給餌回数10回)、4週目(給餌回数20回)にそれぞれ水揚げ(サンプリング数3匹)した後、ブリを切り身にして約4℃の冷蔵保存条件下で保存し、血合筋の色の変化を測定した。具体的には、色彩色差計(コニカミノルタ製:CR-13)を用いてLab値を測定し、褐変の度合いをb/a値で評価した。測定は、水揚げ後、7日経過するまで、6日目を除いて毎日行った。 In addition, in this breeding test 2, after the start of feeding, the fish were landed (3 samples) in the 1st week (5 times of feeding), 2nd week (10 times of feeding), and 4th week (20 times of feeding). After that, the yellowtail was cut into fillets and stored under refrigerated storage conditions at about 4°C, and the change in color of the blood muscle was measured. Specifically, the Lab value was measured using a colorimeter (manufactured by Konica Minolta: CR-13), and the degree of browning was evaluated by the b/a value. Measurements were taken every day until 7 days after landing, except for the 6th day.

続いて、本飼育試験2の結果について、図2~図4を参照しながら説明する。図2~図4は、図1と同様に、横軸が水揚げからの経過日数(日)、縦軸がb/a値を示しており、図2は、1週目に水揚げしたブリ、図3は、2週目に水揚げしたブリ、図4は、4週目に水揚げしたブリの色変化の測定結果を示している。 Next, the results of this breeding test 2 will be described with reference to FIGS. 2 to 4. FIG. In Figures 2 to 4, as in Figure 1, the horizontal axis indicates the number of days elapsed since landing (days), and the vertical axis indicates the b/a value. 3 shows the measurement results of the yellowtail landed in the second week, and FIG. 4 shows the measurement results of the color change of the yellowtail landed in the fourth week.

上記飼育試験1と同じ給餌回数20回の結果を示す図4を参照すると、生食に適していない肉色である、b/a値が0.8を越えた状態となるのは、比較例2の試験区が水揚げから2日目以降であるのに対して、実施例1,2の試験区では、7日目以降となっている。 Referring to FIG. 4 showing the results of feeding 20 times, which is the same as in breeding test 1, the condition where the b/a value exceeds 0.8, which is a flesh color not suitable for raw consumption, is in the test group of comparative example 2. is after the 2nd day after landing, whereas in the test plots of Examples 1 and 2, it is after the 7th day.

すなわち、上記飼育試験1と同様に、実施例1,2の養殖魚用飼料を与えられたブリは、水揚げ後、少なくとも5日目までは生食に適した肉色(鮮赤色)を呈しており、大きく褐変を抑えることができている。 That is, in the same manner as in breeding test 1 above, the yellowtail fed with the farmed fish feeds of Examples 1 and 2 exhibited a flesh color (bright red) suitable for eating raw until at least 5 days after landing. It is possible to greatly suppress browning.

また、図4を参照すると、実施例1と実施例2の褐変抑制効果はほぼ同じであると考えられる。本実施形態に係るチョコレートは、質量比で約30質量%のカカオバターを含有しており、実施例1では、養殖魚用飼料に対して約3質量%のカカオバターが含まれている。 Further, referring to FIG. 4, it is considered that the browning suppressing effects of Examples 1 and 2 are almost the same. The chocolate according to the present embodiment contains about 30% by mass of cacao butter, and in Example 1, about 3% by mass of cacao butter is contained in the feed for cultured fish.

カカオポリフェノールは、一般に1日あたりの体内への吸収量が限られ、1度に多くのカカオポリフェノールを摂取しても体外へ排出されるだけであるため、少量ずつ毎日摂取することが必要と言われている。 In general, the amount of cocoa polyphenols absorbed into the body per day is limited, and even if a large amount of cocoa polyphenols is ingested at one time, it is only excreted from the body. It is

そうすると、褐変抑制効果を奏するカカオバターの養殖魚用飼料への含有量は、約3質量%であれば十分であり、実施例2のカカオバターの含有量(10質量%)は過剰であることが分かる。 Therefore, it is sufficient that the content of cacao butter, which has an effect of suppressing browning, in feed for farmed fish is about 3% by mass, and the content of cocoa butter in Example 2 (10% by mass) is excessive. I understand.

さらに、図3に関して後述するように、実施例1,2に係る養殖魚用飼料の10回の給餌でも褐変抑制効果を十分に奏することに鑑みると、養殖魚用飼料へのカカオバターの含有量は、質量比で1.5質量%以上であれば、十分に褐変抑制効果を奏することができると考えられる。 Furthermore, as will be described later with reference to FIG. 3, in view of the fact that even 10 feeds of the feed for farmed fish according to Examples 1 and 2 exhibit a sufficient effect of suppressing browning, the content of cacao butter in the feed for farmed fish is is 1.5% by mass or more, it is considered that a sufficient effect of suppressing browning can be obtained.

一方、養殖魚用飼料へのカカオバターの含有量の上限については、過剰に含有すると、無駄に排出されるだけであると共に、相対的に配合飼料や生魚等の量が少なくなって養殖魚の成長が阻害されてしまうため、例えば、20質量%以下であることが望ましく、さらに望ましくは、5質量%以下であることが望ましい。
On the other hand, regarding the upper limit of the content of cacao butter in feed for farmed fish, if it is contained in excess, it will only be discharged wastefully, and the amount of mixed feed and raw fish will be relatively small, resulting in growth of farmed fish. For example, it is preferably 20% by mass or less, more preferably 5% by mass or less.

続いて、給餌回数が10回の結果を示す図3を参照すると、実施例1,2の試験区において、b/a値が0.8を越えるのは、水揚げ後、4~5日目であり、給餌回数が2週間で10回であっても、カカオポリフェノールを含有する養殖魚用飼料を用いれば、水揚げ後のブリの褐変を十分に抑制することができる。 Subsequently, referring to FIG. 3 showing the results of feeding 10 times, in the test plots of Examples 1 and 2, the b/a value exceeds 0.8 on the 4th to 5th days after landing, Even if the frequency of feeding is 10 times in 2 weeks, browning of yellowtail after landing can be sufficiently suppressed by using a cacao polyphenol-containing feed for cultured fish.

また、給餌回数が5回の結果を示す図2を参照すると、実施例1,2の試験区において、b/a値が0.8を越えるのは、水揚げ後3日目であり、給餌回数が1週間で5回の場合には、カカオポリフェノールの吸収量がまだ少ないのか、褐変抑制効果が小さいことが分かる。 In addition, referring to FIG. 2 showing the results of feeding five times, in the test plots of Examples 1 and 2, the b/a value exceeds 0.8 on the third day after landing, and the feeding frequency is 1. In the case of 5 times a week, it can be seen that the absorption of cacao polyphenols is still small, and the effect of suppressing browning is small.

以上より、実施例1,2の養殖魚用飼料の給餌は、十分な褐変抑制効果を得るためには、10回以上(10日以上)行うことが望ましい。10回以上給餌することで、個体による摂取量のばらつきも抑えることができる。 From the above, it is desirable to feed the cultured fish feeds of Examples 1 and 2 10 times or more (10 days or more) in order to obtain a sufficient effect of suppressing browning. By feeding 10 times or more, it is possible to suppress the variation in the intake amount among individuals.

また、カカオポリフェノールを添加した養殖魚用飼料を給餌するタイミングは、水揚げの日よりも前過ぎると、魚体内に吸収された筋肉等に蓄積されたカカオポリフェノールが消失してしまうおそれもあるため、水揚げ直前の2ヶ月以内であることが望ましい。 In addition, if the timing of feeding the farmed fish feed added with cacao polyphenols is earlier than the day of landing, there is a risk that the cacao polyphenols that have been absorbed into the fish body and accumulated in muscles, etc., may disappear. Preferably within two months immediately before landing.

以上、本実施形態によれば、カカオバターを所定量含有した養殖魚用飼料を用いることで、ブリの成育を阻害することなく、水揚げ加工後のブリの褐変を強く抑制することができ、鮮魚の商品価値を長く維持することが可能となる。 As described above, according to the present embodiment, by using a cultured fish feed containing a predetermined amount of cacao butter, it is possible to strongly suppress the browning of yellowtail after landing and processing without inhibiting the growth of yellowtail. It is possible to maintain the product value of the product for a long time.

以上、本発明の実施の形態について説明したが、本発明の実施の形態は、上記実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々の変形が可能である。例えば、養殖魚用飼料の配合成分や配合比は適宜変更可能であり、養殖魚用飼料を与えるタイミングや量、回数等も適宜変更可能である。 Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above embodiments, and various modifications are possible without departing from the gist of the present invention. For example, the composition and ratio of the feed for farmed fish can be changed as appropriate, and the timing, amount, frequency, etc. of feeding the feed for farmed fish can also be changed as appropriate.

また、上記実施形態では、養殖魚として、ブリを例に挙げて説明したが、スマ、カンパチ、マグロ等、適宜他の魚種に本発明を適用することができる。 Further, in the above embodiment, yellowtail was described as an example of farmed fish, but the present invention can be appropriately applied to other fish species such as trout, amberjack, and tuna.

Claims (2)

カカオバターを質量比で1.5質量%以上5質量%以下含有し、養殖魚の水揚げ加工後の褐変を抑制することを特徴とする養殖魚用飼料。 A farmed fish feed characterized by containing 1.5% by mass or more and 5% by mass or less of cacao butter and suppressing browning of farmed fish after being landed and processed . カカオバターを質量比で1.5質量%以上5質量%以下含有し、養殖魚の水揚げ加工後の褐変を抑制する養殖魚用飼料を、養殖魚に所定量与えるカカオバター給餌工程であって、少なくとも10日以上に分けて、前記養殖魚の水揚げ直前の二ヶ月以内に行われるカカオバター給餌工程を備えることを特徴とする養殖魚の養殖方法。 A cocoa butter feeding step in which a predetermined amount of farmed fish feed containing 1.5% by mass or more and 5% by mass or less of cocoa butter and suppressing browning after landing processing of farmed fish is provided to farmed fish, the step of feeding the farmed fish for at least 10 days. Divided into the above, the farmed fish farming method is characterized by comprising a cocoa butter feeding step performed within two months immediately before landing of the farmed fish.
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JP2003102396A (en) 2001-09-28 2003-04-08 Oriental Yeast Co Ltd Formula feed for fish culture
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