JP2019135948A - Feeding method to cephalopod, and feeding implement to cephalopod - Google Patents

Abstract

To provide a feeding method and a feeding implement suitable for biology peculiar to cephalopod, which is different from Pisces.SOLUTION: A feeding method to cephalopod for feeding feed includes steps of: holding feed in the water by underwater holding means for holding the feed in the water in a culture tank; and feeding feed to cephalopod. A feeding implement 11 has the underwater holding means for holding the feed 1 in the water in the culture tank 3, by fixing the feed 1 to cephalopod by a hanging string 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for feeding cephalopods and a feeding device for cephalopods.

  Cephalopods such as squid and octopus are very familiar with Japanese diet, but their aquaculture technology has not been established. In connection with this aquaculture technique, the feed becomes important. For example, Patent Document 1 discloses a feed for cultivating cephalopods. In particular, as described in Non-Patent Document 1, octopus has been pointed out to be difficult to breed during the floating larval stage.

JP 2001-275581 A JP 2017-6054 A

Nobuhiko Akiyama (Faculty of Oceanography, Tokai University), “High-density accommodation technology of octopus and larva rearing”, 2017 Annual Meeting of Fisheries Society of Fisheries Breeding, Abstracts pp7-8, 2017

  In aquaculture of aquatic products, many fish are the subject of aquaculture, and the fish are fed while swimming in the water. For this reason, live baits, pellet-like baits, etc. have been fed manually or mechanically. If this method is used, it is possible to continue swimming while feeding, so that it is a feeding method suitable for its ecology.

  On the other hand, when feeding to cephalopods, conventionally, feeding is carried out by a method using a bait like the feeding to these fishes. Also in the above-mentioned patent document 1, feeding by spraying is studied so that the sedimentation speed is defined. However, for cephalopods, the method of feeding fish is simply applied to cephalopods, and no appropriate feeding method and feeding device have been studied so far. An object of the present invention is to provide a feeding method and a feeding device suitable for cephalopods.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor found that the following inventions meet the above-mentioned object, and reached the present invention.

(1) A method for feeding cephalopods, comprising a step of holding the food in water by an underwater holding means for holding the food in the water of the aquaculture tank, and a step of feeding the cephalopods the food Feeding method for cephalopods.
(2) The feeding method according to (1), wherein the step of holding the bait in water by the underwater holding means includes the step of rocking the bait in water.
(3) The step of holding the bait in the water by the underwater holding unit includes the step of suspending the bait by a suspending holding unit for suspending and holding the bait from the opening of the aquaculture tank. ) Or (2).
(4) The feeding method according to (3), wherein the suspension holding means includes a string-like body or a rod-like body to which the bait is attached.
(5) The feeding method according to (4), wherein the suspension holding means includes a fixture that fixes the string-like body and / or the rod-like body.
(6) The feeding method according to (4), wherein the string-like body is at least one string-like body selected from the group consisting of a fishing line, a kite thread, a sewing thread, and a wire.
(7) The feeding method according to (4), wherein the rod-shaped body is at least one rod-shaped body selected from the group consisting of a cylindrical body, a columnar body, and a spindle-shaped body.
(8) The step of holding the bait in the water by the underwater holding means includes the step of holding the bait by the support holding means for attaching the bait to the support disposed in the culture tank and holding it in the water. The feeding method according to (1) or (2) above.
(9) The feeding method according to (8), wherein the supporting and holding means includes a string-like body or a rod-like body that is bridged in a culture tank.
(10) The feeding method according to (8), wherein the support holding means has a rod-like body arranged in a culture tank.
(11) The feeding method according to (9), wherein the string-like body is at least one string-like body selected from the group consisting of a fishing line, a kite thread, a sewing thread, and a wire.
(12) The feeding method according to (9) or (10), wherein the rod-shaped body is at least one rod-shaped body selected from the group consisting of a cylindrical body, a columnar body, and a spindle-shaped body.
(13) The feeding method according to any one of (1) to (12), wherein the bait is separated from a bottom of the aquaculture tank.
(14) The feeding method according to (13), wherein the bait is separated from the bottom of the aquaculture tank by 1 cm or more.
(15) The feeding method according to any one of (1) to (13), wherein the bait is separated from the water surface of the aquaculture tank.
(16) The feeding method according to (15), wherein the bait is separated from the water surface of the aquaculture tank by 1 cm or more.
(17) The feeding method according to any one of (1) to (16), wherein the cephalopod is a octopus superfamily.
(18) The feeding method according to (17), wherein the octopus superfamily is a octopus family.
(19) The feeding method according to (18), wherein the octopus family is an octopus.
(20) The feeding method according to (19), wherein the octopus is a floating octopus.

(21) A feeding device for cephalopods having an underwater holding means for holding food in the water of the aquaculture tank.
(22) The feeding device according to (21), further including a swinging unit that swings the bait held by the underwater holding unit.
(23) The feeding device according to (21) or (22), wherein the underwater holding unit is a suspension holding unit that holds the bait suspended from the opening of the culture tank.
(24) The feeding instrument according to (21) or (22), wherein the underwater holding means is a support holding means for attaching the bait to a support disposed in the culture tank and holding the bait in water.

  According to the feeding method and the feeding device of the present invention, feeding of cephalopods is performed efficiently.

It is a schematic diagram of the feeding instrument which concerns on 1st embodiment of this invention. It is a schematic diagram of the feeding instrument which concerns on 2nd embodiment of this invention. It is a schematic diagram of the feeding instrument which concerns on 3rd embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to examples and the like, but the present invention is not limited to the following examples and the like, and can be arbitrarily modified and implemented without departing from the gist of the present invention. In the present specification, “A to B” or “A to B” are used as expressions including numerical values or physical quantities before and after that. In the present specification, the expression “A and / or B” means “one or both of A and B”. That is, “A and / or B” includes “A only”, “B only”, and “both A and B”.

  The present invention is a method for feeding cephalopods, the step of holding the food in water by an underwater holding means for holding the food in the water of the aquaculture tank, the step of feeding the cephalopods the food It relates to a feeding method to cephalopods. The present invention also relates to a feeding device for cephalopods having an underwater holding means for holding food in the water of a culture tank. The feeding method of the present invention can be implemented by the feeding device of the present invention.

[Underwater holding means]
The “underwater holding means” of the present invention is means for holding cephalopod food in the water between the water surface and the bottom surface of the aquaculture tank. As this underwater holding means, various methods capable of holding food in water can be used. As the underwater holding means, for example, a suspension holding means and a support holding means described later can be used. Using this underwater holding means, the step of holding the food in the water by the underwater holding means for holding the food in the aquaculture tank of the feeding method of the present invention, and the step of feeding the cephalopod to feed the food .

  In feeding the cephalopods of the present invention, the cephalopods are fed while being held in the aquaculture tank by the water holding means. The present inventors have found that feeding of cephalopods is unexpectedly good by performing such feeding. When this feeding is performed, it is possible to feed cephalopods that are swimming in the water tank. As a result, the amount of food intake also increases because the food intake time also increases. In addition, depending on the type of cephalopod, it is easy to visually confirm the increase in food intake.

  Furthermore, by attaching bait to the underwater holding means, it is clear that there is bait at the place where it is attached, so that it becomes easy to grasp the amount of remaining bait. Moreover, since each individual can feed the cephalopods attached to the water holding means at any time, it is easy to adjust the number of feeding operations. Moreover, it is easy to collect the remaining food by collecting the underwater holding means to which the food is attached. Therefore, it is possible to prevent food that the cephalopods did not feed from accumulating at the bottom of the culture tank and contaminating the culture environment. Especially for cephalopods, the present invention is also effective from the viewpoint of feeding efficiency because it is recognized that the food settled on the bottom of the culture tank does not feed.

  In the present invention, the underwater holding means may be configured such that bait is attached to a string-like body or a rod-like body. For example, the bait can be fixed by binding the bait to a string-like body or a rod-like body, or by providing a hole in the bait and inserting it. For this string-like body, various fibrous bodies such as fishing line, kite thread, sewing thread, and wire can be used alone or in appropriate combination. Moreover, a cylindrical body, a columnar body, a spindle-shaped body, etc. can be used individually or in combination as a rod-shaped body. It is preferable that the periphery of the bait attachment position of the underwater holding means is thin so that the cephalopods can easily come into contact with the bait without being inhibited by the underwater holding means. When this is a rod-like body, the whole rod-like body may be thin, or only the attachment position may be thin. In addition, the present invention relates to feeding to cephalopods, and since the periphery of the bait of the underwater holding means is used in a state immersed in salt water in the aquaculture tank, it can be formed of a material having water resistance and salt resistance. preferable. For these materials, for example, resin, wood, metal, carbon fiber, glass fiber, or the like can be used.

[Hanging holding means]
An example of the underwater holding means of the present invention is a suspended holding means. This “suspending and holding means” is means for holding the bait in the water from the opening of the culture tank in a state where the bait is attached and hung. As the suspension holding means, for example, a string-like body or a rod-like body to which bait is attached can be used as it is. Moreover, the thing provided with the fixing tool which fixes the string-like body and rod-shaped body which attached the food can also be used. In the feeding method of the present invention, the step of holding the feed in water can include a step of suspending the feed by the suspension holding means for suspending and holding the feed from the opening of the culture tank.

  The suspension holding means of the present invention includes a string-like body or rod-like body to which bait is attached, and is configured to suspend the string-like body or rod-like body to which the bait is attached directly from the opening of the aquaculture tank. Can do. By using such a string-like body or a rod-like body, the arrangement and recovery of bait can be performed from the opening side by a simple operation. This string-like body or rod-like body can be hung by holding its end or the like by hand, or can be arranged to hang from the edge of the opening.

  The suspension holding means of the present invention comprises a fixture for fixing a suspended portion of a string-like body or a rod-like body to which bait is attached, and suspends the bait in the aquaculture tank by suspending the suspended portion in water. It can be. The fixing tool in the present invention is for fixing a suspended portion of a string-like body or a rod-like body to which bait is attached. By fixing the hanging portion to the fixing tool, it is possible to easily arrange, move, and collect bait in the water by the hanging holding means by handling the fixing tool. For example, a hook, bar, plate, or the like can be used as the fixture. Some of these fixtures are arranged outside the culture tank or near the lid, and the part with the suspended part is arranged in the opening at the top of the culture tank, or the edge of the opening of the culture tank is It can be constructed as a bridge.

[Support and holding means]
Another example of the holding means in water is a support holding means. This “support and holding means” is means for attaching bait to a support body disposed on the side surface or bottom of the aquaculture tank and holding it in water. As this support holding means, for example, a string-like body or a rod-like body spanned in the culture tank can be used. Moreover, it can be set as the rod-shaped body arrange | positioned at a culture tank. In the feeding method of the present invention, the step of holding the feed in water can include the step of holding the feed by a support holding means for attaching the feed to a support disposed in the culture tank and holding the feed in water.

  As the support holding means, for example, a string-like body or a rod-like body spanned in the culture tank can be used. A bait can be attached to the string-like body or the rod-like body so that the bait is held in water. Feeding cephalopods efficiently by feeding in this way. The string-like body and the rod-like body can be arranged so as to bridge between the side surfaces in the culture tank or between the bottom portion and the side surfaces. An attachment portion can be provided on the side or bottom of the culture tank so that the string-like body or the rod-like body can be easily attached. Moreover, you may provide the attachment part so that it may be easy to attach to the side surface and bottom part of a culture tank also on a string-like body or a rod-shaped body side. The attachment portion is a member for attaching a string-like body or a rod-like body. The mounting portion can have a claw shape, a ring shape, a pinch shape, a screw shape, an insertion plug shape, a suction cup shape, or the like. Using these attachment portions, a string-like body or a rod-like body can be bridged in the culture tank.

  As the support and holding means, a rod-like body or the like arranged in the aquaculture tank can be used to attach the bait to the rod-like body or the like so as to be held in water. Feeding cephalopods efficiently by feeding in this way. This rod-shaped body can be provided on the bottom or side surface of the culture tank. The rod-shaped body can maintain the shape of the rod-shaped body itself even in a state where bait is attached to the tip or intermediate portion thereof. Therefore, the bait can be held in water by attaching at least one portion of the rod-like body to the bottom or side. In order to provide the rod-shaped body on the bottom or side surface, a mounting portion used for the above-described bridging may be provided on the side surface, bottom or rod-shaped body of the culture tank.

[Aquaculture tank]
In the present invention, the “culture tank” refers to equipment capable of accumulating a certain amount of water capable of breeding cephalopods. This aquaculture tank includes facilities for the purpose of cultivating cephalopods and rearing, transporting and acclimatizing them. In the culture tank, it is preferable to appropriately measure pH, dissolved oxygen amount, ammonia concentration, etc. continuously in order to keep cephalopods. The aquaculture tank may use a part of the ocean, a river, a lake, or the like, or may be provided with an artificial aquaculture facility. In particular, in the present invention, an artificial land facility that can easily manage the aquaculture tank is preferable.

[Separation from the bottom]
In feeding the cephalopods of the present invention, it is preferable that the food held by the water holding means is separated from the bottom of the aquaculture tank. The distance away from the bottom can be 1 cm or more, 5 cm or more, 10 cm or more, 15 cm or more, 20 cm or more, 25 cm or more, 30 cm or more, 35 cm or more, 40 cm or more in the water surface direction. The cephalopods are preferably separated from the bottom in this way because they are difficult to feed the food that has settled and is in contact with the bottom.

[Separation from the water surface]
Further, the distance from the water surface is not particularly defined and may be floating on the water surface, but may be separated from the water surface. The distance away from the water surface can be 1 cm or more, 5 cm or more, 10 cm or more, 15 cm or more, 20 cm or more, 25 cm or more, 30 cm or more, 35 cm or more, 40 cm or more in the depth direction. Although the bait may be located on the water surface, it is preferable that the bait is away from the water surface because the cephalopods inside the culture tank can be fed without floating near the water surface.

[Swing of food]
Moreover, in the feeding method of this invention, it is preferable to rock | fluctuate the food hold | maintained by the water holding means in water. This swinging means that the bait moves. For example, the bait can be shaken by shaking the underwater holding means by hand. The feed can also be shaken by the water flow in the aquaculture tank. In addition, by making the underwater holding means easy to shake, the cephalopods can be shaken by contacting the food. Moreover, it can carry out by rocking | fluctuating with the rocking | swiveling means which rocks an underwater holding means. The feeding behavior of cephalopods can be induced by rocking the food held in the water holding means. As a result, the bait moves in the water, so that the interest of cephalopods can be raised and the feeding activity can be stimulated. This rocking may be any rocking movement, for example, about 5 mm to 5 cm in any direction such as front, back, left, right, up and down, and the period of the rocking moves within the distance of about 1 to 5 seconds. can do.

[Oscillating means]
In the present invention, the “swinging means” is to swing the bait held in the underwater holding means. In the feeding method of the present invention, the step of holding the food in water can include the step of rocking the food in water. As a result, since the bait only needs to swing, the string-like body or rod-like body itself to which the bait is attached, or the underwater holding means itself to which the hanging strap is fixed may be swung. The swinging method is not particularly limited, and the part to be swung (bait, hanging string, hanging means, etc.) is continuously or intermittently used as a cylinder, pendulum, motor, vibrator, pump for generating water flow, etc. alone or appropriately. Depending on the combination, one that rocks the bait can be used.

[Cephalopods]
“Cephalopods” to be fed by the feeding method and feeding apparatus of the present invention belong to the mollusc moniocephalus. The present invention can be applied to all cephalopods that are the target of aquaculture and breeding with these cephalopods. Specific examples include squid, sea squid, cuttlefish, octopus, squid, octopus and octopus maya.

  In particular, the cephalopods to be fed according to the present invention are preferably the octopus department, more preferably the octopus department of the octopus department, and the octopus of the octopus family. The octopus is edible especially in Japan and is an aquatic product for which establishment of complete aquaculture technology is desired. The feeding method of the present invention is very suitable for the complete culture of the octopus, and the octopus is good to feed the food held by the water holding means as in the present invention.

  The octopus hatches about one month after being laid, and weighs about 0.05 g. The octopus begins about 80 days after laying eggs and begins to live in the bottom when the weight reaches approximately 3 to 5 g. About 30 to 80 days after egg laying from the hatching to the bottom is called the floating period. The floating octopus has a body length of about 4 to 8 mm. Feeding according to the present invention is particularly suitable for flying octopus, although it is effective even for octopus after landing.

  Although this floating season is a time when the octopus is difficult to grow, according to the present invention, the floating octopus efficiently feeds and can contribute to the improvement of the growth rate and survival rate. In addition, feeding according to the present invention, including feeding in this floating period, may be used in combination with feeding by other sowing baits or biological feeds. The feeding according to the present invention can also be used in combination with a biological feed and / or a mixed feed.

[feed]
In the present invention, the “bait” held in the water holding means can use various types of baits that are used as cephalopods. In particular, a solid bait is used because it is held in the water holding means. As such baits, raw materials such as small fish, shellfish, fish meat, shellfish, squid meat, and livestock meat can be used. In addition to these, casein, gluten, gelatin, starch, alginic acid molding agent, fish meal, squid meal, meat meal, etc., oils and fats, various extracts, vitamins, minerals, etc., mixed appropriately, etc. Can be used.

[First embodiment]
The schematic diagram of 1st embodiment which concerns on the feeding instrument of this invention in FIG. 1 is shown. FIG. 1 is a diagram illustrating a state in which the feeding device 11 is used for octopus 5 culture. In the feeding device 11, the bait 1 is fixed to the hanging strap 21 of the suspension holding means, and is suspended in the aquaculture water 4 of the aquaculture tank 3, and the bait is retained in the water. The hanging strap 21 is fixed to a hanging strap fixing portion 211. The suspension strap fixing portion 211 is a rod-like body because it is more rigid to maintain the distance between the plurality of suspension straps 21 and to be easier to handle such as collection and arrangement. In this feeding device 11, the swing device 6 is attached to the hanging strap fixing portion 211, and the swing device 6 is fixed to the hanging strap 21 by swinging the hanging strap fixing portion 211 and the hanging strap 21. The bait 1 can be swung. According to such a feeding device, the bait is held in water, and cephalopods such as octopus can efficiently feed.

[Second Embodiment]
The schematic diagram of 2nd embodiment which concerns on the feeding instrument of this invention in FIG. 2 is shown. FIG. 2 is a diagram illustrating a state where the feeding device 12 is used for octopus 5 culture. In the feeding device 12, the bait 1 is fixed to the support holding means 22 and is held in the aquaculture water 4 of the aquaculture tank 3. The support holding means 22 is a string-like body and is arranged so as to cross between the side surfaces of the culture tank 3. The feeding device 12 is provided with a swing device 6 connected to the string of the support holding means 22, and the feed 1 can be swung by the swing device 6. According to such a feeding device, the bait is held in water, and cephalopods such as octopus can efficiently feed.

[Third embodiment]
The schematic diagram of 3rd embodiment which concerns on the feeding instrument of this invention in FIG. 3 is shown. FIG. 3 is a diagram illustrating a state in which the feeding device 13 is used for octopus 5 culture. In the feeding device 13, the bait 1 is fixed to the support holding means 23 and is held in the aquaculture water 4 of the aquaculture tank 3. This support holding means 23 is a rod-like body, and has a configuration in which the bait 1 is fixed to the tip or intermediate portion thereof and the bait 1 is supported from the bottom side. A rocking device (not shown) can also be attached to the feeding device 13 to rock the food 1. According to such a feeding device, the bait is held in water, and cephalopods such as octopus can efficiently feed.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is changed.

  In the aquaculture tank, hatched octopus was cultured until 100 days of age. About 500 octopus were cultivated in a 500 L culture tank. Squid was used as the bait fixed to the hanging strap.

[Example 1]
Feeding state of octopus, etc. while feeding by suspending and fixing the food on the hanging strap around 3-10 cm from the water surface and around 50 cm from the bottom surface by the underwater holding means using the hanging strap according to the configuration of FIG. Was observed. The fishing line was fixed to a tree and used. The octopus was raised in the range of 17-23 ° C. using seawater.

[Aquaculture Results] The following conditions were mainly observed during the cultivation. The state of growth and the presence or absence of bottoming were judged visually. The drowning was also judged visually. The bottoming rate was calculated by the ratio of the number of individuals that settled out of the number of individuals that were put into the water tank.
On the 25th day from the start of feeding, it was confirmed that the octopus of the octopus was sufficiently fed so that the filled food was visible. In addition, in the feeding method like the comparative example mentioned later, feeding behavior was complete | finished within 1-2 minutes, and the individual | organism | solid which filled the food into the stomach bag was not seen. The octopus was fed while adhering to the food fixed to the hanging strap, and was again adhering to the food when it was away from the food.
Similarly, at the time of 25 days from the start of feeding, it was confirmed that when the food was manually fed while rocking, octopus gathered in the food more easily and the feeding decreased faster than when no rocking occurred.
Also, during the cultivation, the bait does not accumulate at the bottom of the aquaculture tank, so there is little contamination and there is no need to clean the bottom of the aquarium. In addition, when 100 days passed, the number of the octopus that settled was about 28.

[Comparative Example 1]
Without fixing with a hanging strap, the same amount of bait as in Example 1 was fed as a bait at a frequency of 2 to 3 times / day. However, if the bait was the same size as in Example 1, it immediately settled, so it was fed in a state of being cut to about 2 mm.

[Aquaculture Results] The following conditions were mainly observed during the cultivation. The state of growth and the presence or absence of bottoming were judged visually. The drowning was also judged visually. The bottoming rate was calculated by the ratio of the number of individuals that settled out of the number of individuals that were put into the water tank.
When the strap was not fixed, most of the bait settled without being fed and sank to the bottom of the aquarium. When octopus was fed, it was fed while floating in the water of the aquaculture tank, but the feeding time was short, and when it was released, the food settled, and the food that settled at the bottom of the aquaculture tank was fed again There was nothing to do. In addition, 5 dead octopus were produced when 60 days passed, but the produced individuals were small, and after 100 days, the number of surviving octopus was about 0.

  As is apparent from the results of Examples and Comparative Examples, octopus fed according to the present invention had a high bottoming rate, and many individuals grew to a size that could be satisfactorily settled within 80 days. On the other hand, in the feeding method using the bait of the comparative example, the bottoming rate was low and the growth was slow.

  The present invention is an excellent method for feeding cephalopods and feeding equipment, and according to this, feeding cephalopods that are difficult to cultivate can be efficiently performed, contributing to the improvement of aquaculture efficiency, etc. It is useful above.

DESCRIPTION OF SYMBOLS 1 Feed 11, 12, 13 Feeding device 21 Hanging string 211 Hanging string fixing | fixed part 22, 23 Support holding means 3 Culture tank 4 Cultured water 5 Octopus 6 Oscillator

Claims (24)

  A method for feeding cephalopods, comprising a step of holding food in water by means of an underwater holding means for holding food in the water of an aquaculture tank, and a step of feeding the cephalopods with the food Feeding method.   The feeding method according to claim 1, wherein the step of holding the bait in water by the underwater holding means includes the step of rocking the bait in water.   The step of holding the bait in the water by the underwater holding unit includes a step of suspending the bait by a suspension holding unit for suspending and holding the bait from the opening of the aquaculture tank. Feeding method.   The feeding method according to claim 3, wherein the suspension holding means includes a string-like body or a rod-like body to which the bait is attached.   The feeding method according to claim 4, wherein the suspension holding means includes a fixture that fixes the string-like body and / or the rod-like body.   The feeding method according to claim 4, wherein the string-like body is at least one string-like body selected from the group consisting of a fishing line, a kite thread, a sewing thread, and a wire.   The feeding method according to claim 4, wherein the rod-shaped body is at least one rod-shaped body selected from the group consisting of a cylindrical body, a columnar body, and a spindle-shaped body.   The step of holding the bait in the water by the underwater holding means includes the step of holding the bait by a support holding means for attaching the bait to a support disposed in the culture tank and holding it in the water. The feeding method according to 1 or 2.   The feeding method according to claim 8, wherein the supporting and holding means includes a string-like body or a rod-like body that is bridged in the culture tank.   The feeding method according to claim 8, wherein the support holding means has a rod-like body arranged in the aquaculture tank.   The feeding method according to claim 9, wherein the string-like body is at least one string-like body selected from the group consisting of a fishing line, a kite thread, a sewing thread, and a wire.   The feeding method according to claim 9 or 10, wherein the rod-shaped body is at least one rod-shaped body selected from the group consisting of a cylindrical body, a columnar body, and a spindle-shaped body.   The feeding method according to any one of claims 1 to 12, wherein the bait is separated from a bottom of the culture tank.   The feeding method according to claim 13, wherein the bait is separated from the bottom of the aquaculture tank by 1 cm or more.   The feeding method according to any one of claims 1 to 13, wherein the bait is separated from the water surface of the aquaculture tank.   The feeding method according to claim 15, wherein the bait is separated from the water surface of the aquaculture tank by 1 cm or more.   The feeding method according to claim 1, wherein the cephalopod is a octopus superfamily.   The feeding method according to claim 17, wherein the octopus superfamily is a octopus family.   The feeding method according to claim 18, wherein the octopus family is a octopus.   The feeding method according to claim 19, wherein the octopus is a floating octopus.   A feeding device for cephalopods having an underwater holding means for holding food in the water of a culture tank.   The feeding device according to claim 21, further comprising rocking means for rocking the bait held by the underwater holding means.   The feeding device according to claim 21 or 22, wherein the underwater holding means is a hanging holding means for holding the bait suspended from the opening of the aquaculture tank in the water.   The feeding device according to claim 21 or 22, wherein the underwater holding means is a support holding means for attaching the bait to a support body disposed in the culture tank and holding the bait in water.