JP3955947B2 - Crustacean larva rearing method and apparatus - Google Patents

Description

【００１７】
試験例２
最終齢のフィロゾーマを各２０尾ずつ試験例１と同様の速度で上下回転する飼育水槽中にてそれぞれ飼育し、稚エビに成長した数を確認し、それぞれ稚エビ化率を求めた。その結果は表２の通りであった。
【００１８】
【表２】

【００１９】
【発明の効果】
本発明によれば、飼育水槽が回転しているため、底部に沈殿物が生成することがないと共に、当該回転に伴なって生じた水流により甲殻類の幼生も上方に浮遊するため、従来の如く、底部で沈殿物と接触することがない結果、バクテリアによる死亡率が著しく軽減される。
しかも、甲殻類の幼生が、発生した水流により上方に浮遊しているため、給餌時エサとの接触が底部ではなく上方の水中で可能となるため、新鮮なエサの摂取により、生残率が更に向上する。
以上従って、本発明によれば甲殻類の幼生を、高い生残率で効率良く大量飼育することができる。
【図面の簡単な説明】
【図１】本発明飼育装置の概略正面説明図。
【図２】本発明飼育装置の概略断面説明図。
【符号の説明】
１０：固定軸
１１：中空部
１２：給水口
１３：給水ノズル
２０：基枠
３０：飼育水槽
３１：円筒部
３１ａ：連結用鍔部
３２：半球状部
３２ａ：連結用鍔部
３３：連結カバー部
３４：蓋部
４０：オーバーフロー排水管
５０：駆動輪[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for raising larvae of crustaceans such as shrimps and crabs.
[0002]
[Prior art]
Traditionally, crustacean larvae such as shrimp and crabs were only raised in fixed tanks.
However, crustacean larvae, such as lobster phyllosoma, are generally vulnerable to bacteria and have little swimming ability. As a result, the survival rate is extremely low. In order to prevent contact with sediments, it is conceivable that the water in the tank is agitated with air, but the crustacean larvae are not easily adopted because they are vulnerable to strong water flow. It was.
Thus, conventionally, it has been difficult to efficiently raise large quantities of crustacean larvae.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such conventional problems and circumstances, and a breeding method and apparatus capable of efficiently raising a large number of crustacean larvae including phyllosoma of Ise shrimp at a high survival rate. The purpose is to provide.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present inventor has conducted various researches. As a result, if the crustacean larvae are reared up to 30 days after hatching while rotating the aquarium wall at a rate of 0.3 to 1.0 cm per second, It was found that an excellent survival rate was obtained, and that after 30 days from hatching, if the speed was set to 0.3 to 0.5 cm per second, the shrimp rate was improved, and the present invention was completed.
[0005]
In addition, as a result of intensive studies to develop a breeding apparatus suitable for the breeding, the present inventor has devised a single tank type breeding apparatus excellent in handling workability and completed the present invention.
[0006]
That is, the present invention achieves the above-mentioned object by rearing crustacean larvae up to 30 days after hatching in a breeding aquarium that moves up and down at a speed of 0.3-1.0 cm per second moving the circumferential wall of the aquarium. Is. Moreover, the said objective is achieved by setting the said speed | rate to 0.3-0.5 cm after progress of 30 days after hatching.
[0007]
Further, the present invention provides a fixed shaft that has a hollow portion and is installed horizontally, and is provided with a water supply channel and an overflow drainage channel using the hollow portion, and the breeding water tank can be rotated up and down freely. The above-mentioned purpose is achieved by the attached single tank crustacean larva rearing device.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
1 and 2, reference numeral 10 denotes a fixed shaft, which is suitably fixed horizontally on the base frame 20 or the like, and a breeding water tank 30 is attached to the fixed shaft 10 so as to be rotatable up and down. The specific attachment means of the breeding water tank 30 to the fixed shaft 10 is not particularly limited as long as it can rotate freely and can secure water tightness.
[0010]
The fixed shaft 10 has a hollow portion 11, and a water supply port 12 into an appropriate number of breeding water tanks 30 communicating with the hollow portion 11 is formed on the peripheral wall portion thereof, A water supply nozzle 13 that communicates with the hollow portion 11 protrudes outward, and a water supply path into the breeding water tank 30 is formed by the water supply nozzle 13, the hollow portion 11, and the water supply port 12.
[0011]
Further, in the hollow portion 11 of the fixed shaft 10, an overflow drain pipe 40 having one end projecting and opening to the outside and the other end projecting and opening into the breeding aquarium 30 is disposed. An overflow drainage channel is formed to adjust the flow rate constant.
[0012]
The form of the breeding water tank 30 is not particularly limited, such as a cylindrical body or a rectangular cylinder. However, when corners are present on the inner peripheral wall, food septics and wastes are likely to settle at the corners. Therefore, larvae contact with the septics and wastes at the corners and die. Therefore, it is particularly advantageous to use a so-called rugby ball-like tank body having a substantially elliptical cross section with no corners on the inner peripheral wall surface. For example, such a rugby ball-like breeding water tank 30 is obtained by connecting a hemispherical portion 32 to both sides of the cylindrical portion 31 in the center, for example. Reference numeral 34 denotes a lid that opens and closes an opening formed in a part of the cylindrical portion 31.
[0013]
Reference numeral 50 denotes a drive wheel, which is disposed in the lower part of the breeding aquarium 30 so as to be in contact with the outer peripheral surface of the breeding aquarium 30, and is rotated by a driving force of a motor (not shown) appropriately transmitted by means. Incidentally, the breeding water tank 30 is rotated by the frictional force accompanying the rotation of the drive wheel 50. In addition, the specific part of the outer peripheral surface of the breeding water tank 30 with which the driving wheel 50 contacts is not limited, but the breeding water tank 30 is configured by connecting the hemispherical parts 32 to both sides of the cylindrical part 31 as described above. In this case, it is preferable that the connection cover portion 33 is crowned on the connection flange portions 31a and 32a.
[0014]
Next, the operation of the breeding device of the present invention according to such an embodiment will be described.
First, water is put into the breeding aquarium 30 and crustacean larvae are put therein, and the drive wheel 50 is rotated by driving the motor. Then, due to the frictional force accompanying the rotation of the drive wheel 50, the breeding aquarium 30 in contact with the drive wheel 50 rotates up and down, and the peripheral wall of the breeding aquarium 30 serving as the bottom rotates without moving. Then, a water flow is generated in the breeding water tank 30. Here, as will be apparent from the following test examples, the rotation speed is particularly preferably set to a speed at which the peripheral wall of the water tank moves 0.3 to 1.0 cm, particularly 0.5 to 1.0 cm per second until 30 days after hatching. Results are obtained. Also, after 30 days from hatching, particularly from the final age phyllosome, it is advantageous to set the speed at which the peripheral wall of the aquarium moves 0.3 to 0.5 cm per second.
[0015]
Test example 1
300 phyllosomas immediately after hatching of lobsters in a breeding aquarium that rotates up and down at a speed that moves the perimeter of the aquarium at 0 (not rotating), 0.3, 0.5, 1.0, and 1.5 cm per second. The tails were reared according to a conventional method, the number of survivors on the 30th day was confirmed, and the survival rate was determined for each. The results are shown in Table 1.
[0016]
[Table 1]

[0017]
Test example 2
Each of the 20 final phyllosomas was bred in a breeding aquarium rotating up and down at the same speed as in Test Example 1, and the number of juvenile shrimp grown was confirmed. The results are shown in Table 2.
[0018]
[Table 2]

[0019]
【The invention's effect】
According to the present invention, since the breeding aquarium is rotating, no sediment is generated at the bottom, and the crustacean larvae also float upward due to the water flow accompanying the rotation. Thus, as a result of the absence of contact with sediment at the bottom, bacterial mortality is significantly reduced.
Moreover, because crustacean larvae float upward due to the generated water flow, contact with food during feeding is possible not in the bottom but in the water above, so the intake of fresh food increases the survival rate. Further improvement.
Thus, according to the present invention, crustacean larvae can be efficiently bred in large quantities with a high survival rate.
[Brief description of the drawings]
FIG. 1 is a schematic front explanatory view of a breeding apparatus of the present invention.
FIG. 2 is a schematic sectional explanatory view of the breeding device of the present invention.
[Explanation of symbols]
10: Fixed shaft 11: Hollow portion 12: Water supply port 13: Water supply nozzle 20: Base frame 30: Breeding water tank 31: Cylindrical portion 31a: Connecting hook portion 32: Hemispherical portion 32a: Connecting hook portion 33: Connecting cover portion 34: Lid 40: Overflow drain pipe 50: Drive wheel

Claims (6)

  A crustacean larva rearing method characterized in that crustacean larvae are bred up to 30 days after hatching in a rearing tub that moves up and down at a speed of 0.3 to 1.0 cm per second moving around the aquarium wall.   A crustacean larva rearing method characterized by rearing crustacean larvae 30 days after hatching in a rearing tank that moves up and down at a speed of 0.3 to 0.5 cm per second of movement of the peripheral wall of the aquarium.   3. The method for raising crustacean larvae according to claim 2, wherein the crustacean larvae are final phyllosoma. A fixed shaft that has a hollow portion and is installed horizontally is provided with a water supply channel and an overflow drainage channel using the hollow portion, and the breeding water tank is attached to be freely rotatable up and down. A single tank crustacean larva rearing device. 5. The crustacean larva rearing apparatus according to claim 4 , wherein the rearing tank is composed of a tank body having a substantially elliptical cross section with no corners on the inner peripheral wall surface. 6. The crustacean larva rearing apparatus according to claim 4, wherein the rearing tank is provided with a drive wheel that rotates the rearing tank in contact with the outer peripheral surface thereof.

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