JPH0246172B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cultivating fishing bait insects such as cutworms and lugworms.

Cattle worms, lugworms, etc., which belong to the annelid polychaete family, are suitable as bait insects for sea fishing, but as the number of fishing ports increases, it is not possible to meet demand by collecting them from domestic habitats, and in recent years most of them have been taken overseas. Currently, the country is dependent on imports from Japan.

However, there are problems with soaring import prices, freshness (quality), and stable supply, so research into cultivating sardine worms, lugworms, etc. is underway.

Conventionally, several proposals have already been made regarding methods and devices for cultivating bait insects for fishing such as caterpillars and lugworms.

For example, JP-A-58-13333 describes a method and apparatus for cultivating snails, lugworms, etc. in the pipes by providing a perforated plate in an aquarium and suspending pipes through the holes of the perforated plate. The method and device described in this publication are suitable as a method and device for preserving and raising feeding insects that have grown to adults, but they are suitable for feeding insects that have grown into adults.
cm) until they reach commercial size adults (approximately 20 cm in length), the initial stage of hatching larvae not only have weak vitality, but also lack the ability to nest in pipes, so it takes only a short time for the larva to grow from larva to adult. It is difficult to farm efficiently between the two. Furthermore, the method described in this publication has further drawbacks in terms of supplying oxygen suitable for the growth of larvae, supplying food, and rearing the larvae until they begin to nest in pipes.

The present inventors have conducted intensive research on the cultivation of bait insects for fishing, such as sardines and lugworms, with the aim of developing a technology to efficiently cultivate them from larvae to commercial-sized adults in a short period of time. , arrived at the present invention.

The present invention provides a cylindrical member group consisting of a large number of nesting cylindrical members arranged vertically at desired intervals from the bottom of the tank in a tank having a seawater supply chamber and a drainage chamber, A breeding chamber formed by a porous member provided on the substrate and a medium provided on the porous member is provided between the seawater supply chamber and the drainage chamber, adult feeding insects are placed in the medium, and seawater is filled to the surface of the medium. While flowing seawater to the top surface of the medium and the bottom of the group of cylindrical members, larvae are grown in the medium and nested in the cylindrical nesting member, after which the medium is removed and the larvae are reared to adulthood in the cylindrical nesting member. A method for cultivating bait insects for fishing, and a seawater supply chamber at one end of the tank, a drainage chamber at the opposite end, and a seawater supply chamber and a drainage chamber so that the chambers communicate with each other at the bottom of the tank. A breeding room is provided in between, and the breeding room consists of a cylindrical member group consisting of a large number of nesting cylindrical members arranged vertically at desired intervals from the bottom of the tank, and a porous hole provided on the cylindrical member group. The drainage chamber is divided into an upper drainage part for running water and a lower drainage part for running water by a partition member so as to communicate at the bottom of the drainage chamber. The present invention relates to a fishing bait insect culturing device characterized in that drainage ports are provided so that the drainage ports are located at higher positions.

Next, the present invention will be explained in more detail with reference to the drawings.

Fig. 1 is a plan view showing one embodiment of the device of the present invention, Fig. 2 is a cross-sectional view taken from Fig. 1, and Fig. 3 is a cross-sectional view showing one embodiment of the cylindrical member used in the device of the present invention. It is a diagram.

When young caterpillars such as rotifers and lugworms become larvae with a body length of about 3 mm, they move from the swimming stage in which they swim in seawater to the settling stage in which they nest in a medium such as sand, and their resistance to protozoa in seawater increases. However, they still lack sufficient vigor and lack the ability to nest in cylindrical members such as pipes. In the present invention, a nest bed suitable for the growth period of the larvae is formed and the larvae are cultivated until they become adults.

The tank 1 is provided with a seawater supply chamber 3 at one end, a drainage chamber 4 at the opposite end, and a breeding chamber 2 between the seawater supply chamber 3 and the drainage chamber 4, and each chamber is arranged as shown in Fig. 2. As is clear from the figure, the bottom of the tank 1 is connected to the bottom of the tank 1 so that seawater can flow therethrough.

The rearing room 2 consists of a number of cylindrical nesting members 5 arranged vertically at desired intervals from the bottom of the tank 1 to the extent that seawater can pass through the bottom, and a cylindrical member group on top of the cylindrical member group. It is formed by the provided porous member 6 and double layers 7 and 7' provided on the porous member 6.

The nesting tubular member 5 may be arranged vertically in the longitudinal direction, but if it is arranged diagonally in the longitudinal direction as shown in the figure (Fig. 2), the incubation rate of larvae will be higher, and Since a shallow depth can be used as
This is suitable because it is easy to increase the water exchange rate in the tank 1, and space can be saved when installing the tanks 1 in multiple stages. The angle of inclination when placing diagonally is 45
~70° is appropriate. The nesting cylindrical member 5 is open at the top and bottom.

The inner diameter of the nesting tubular member 5 is about the same as the size of an adult insect, generally about 3 to 5 mm, and the length is 20 to 30 cm.
The degree is appropriate, and the cross-sectional shape of the tube hole 8 is rectangular.
There are no particular restrictions on the shape, such as a triangle, hexagon, oval, or circle. Further, the nesting cylindrical member 5 may be an integrally molded product having a large number of cylindrical holes 8 (FIG. 3), such as a plastic cardboard board, or may be a single-hole cylindrical member. Further, when a group of tubular members is formed by gathering together the single-hole nesting tubular members 5, there is a great advantage that only the nesting tubular members 5 in which feeding insects have nested can be selectively shipped when shipping as a product. The cylindrical member group consisting of the nesting cylindrical member 5 is preferably set in the tank 1 using a supporting member 12 such as a plate or a rod, so that it can be removed from the tank 1.

A porous member 6 for accommodating a culture medium is removably provided on the cylindrical member group. The porous member 6 may be provided so as to be stretched over the bottom of the frame plate 13, or the porous member 6 may be formed into, for example, a box shape without using the frame plate 13. In addition, 14 in the figure is the frame plate 13
It is a supporting member of. The porous member 6 may be a net or a perforated plate, but a net is more convenient to use. The material of the net may be natural fiber, synthetic fiber, metal fiber, etc., and the mesh size is suitably about 6 to 8 meshes. Further, when a perforated plate is used as the porous member 6, the material thereof is not particularly limited as long as the pore diameter is about 2 to 3 mm.

Generally, it is convenient to use sand as the culture medium 7, 7', but changing the particle size to form two layers, a fine sand layer 7 and a coarse sand layer 7', is suitable for the living environment of the larvae.
This is preferable because the growth rate is also faster. Medium 7,
The thickness of the fine sand layer 7 at 7' is about 50 mm, and the grain size is about 1
The thickness of the rough sand layer 7' is preferably about 50 mm.
The particle size is preferably about 80 mm, and the particle size is about 3 mm. By forming the culture medium 7, 7' into two layers, it is possible to prevent sand from clogging the pores of the porous member 6, resulting in solidification and clogging, and the occurrence of extreme unevenness in the dissolved oxygen concentration in the breeding chamber 2. This can be prevented, and the invasion of the larvae into the nesting tubular member 5 can be facilitated, thereby making it possible to provide an even better living environment for the larvae.

Seawater is supplied to the seawater supply chamber 3 from a seawater supply pipe 17 via a conduit 15 and a valve 16 . Seawater with a temperature of about 15 to 25°C is suitable because the growth rate of the larvae is fast. Also, seawater supply pipe 1
7 is preferably one having slits, holes, etc. approximately the same length as the width of tank 1 so that the water flows uniformly over the culture medium 7 of culture medium 7. It is preferable to drop the seawater from a position higher than the water surface because this increases the effect of preventing oxygen deficiency in the seawater in the tank 1.

Seawater supplied to seawater supply chamber 3 is initially supplied to tank 1.
The seawater fills the seawater supply chamber 3, breeding chamber 2, and drainage chamber 4 and reaches the surface of the culture medium 7, and some of the seawater eventually drains from the drain port 21 of the drain pipe 20 provided in the upper water drainage section 19. The other part is from the bottom of the cylindrical member group of the seawater supply chamber 3 and breeding chamber 2 to the partition member 2 of the drainage chamber 4.
2 through the communication port 23 at the bottom of the lower part of the drainage section 2.
4 and is discharged out of the system from the drain port 26 of the drain pipe 25.

The drainage chamber 4 has an upper running water drainage section 19 at its bottom.
A partition member 22 is provided so that the drain section 24 for lower flowing water communicates with the drain section 24, and the drain sections 19 and 24 have drain ports 21 and 26, respectively, so that the drain ports are located at a position higher than the top surface of the culture medium 7. Because of this, seawater is drained from the drain ports 21 and 26 while flowing through the top surface of the culture medium 7 and the bottom of the cylindrical member group.
The flow rate of the upper water flowing on the top surface of the culture medium 7 and the lower water flowing on the bottom of the cylindrical member group can be easily adjusted by changing the opening area of the drain port 21 and the opening area of the drain port 26. is possible. In addition, the amount of water flowed between the upper and lower portions of the water is limited because during the period when the larvae are growing in the medium, the larvae's oxygen demand is low, and if the amount of water in the upper portion is increased, the larvae nested in the medium 7 may leave the nest. is the heat retention effect of tank 1,
In terms of waste discharge, etc., it is preferable that the amount of water flowing at the bottom is larger than the amount of water flowing at the top. By running water in both the upper and lower parts of the breeding room 2, the breeding room 2 is appropriately replaced with fresh seawater and has a good heat retention effect, which prevents the growth of bacteria and the water from spoiling. It is possible to prevent this and create a favorable environment for the growth of larvae. Place the larvae on medium 7,7'
When growing with the upper flow rate V ₁ and lower flow rate
It is appropriate that _{the ratio (V 1 /} V ₂ ) to V 2 is about 4/6 to 3/7.

In addition, as shown in FIG. 1, the drain pipe 20 has a length comparable to the width l of the rearing room 2 in the drain chamber 4, and porous or slit-shaped drain ports 21 are formed evenly in the longitudinal direction of the drain pipe 20. It is preferable to provide such a medium because it makes it easy to uniformly flow water over the top surface of the culture medium 7, further prevents uneven distribution of larvae, and furthermore prevents variations in the growth rate of larvae. It is.

Also, since larvae are animals that are sensitive to dissolved oxygen,
During aquaculture, it is preferable to measure the dissolved oxygen concentration in the seawater in the rearing room 2 appropriately to avoid extreme differences as much as possible. The amount of dissolved oxygen is suitably in the range of 5 to 10 ppm, preferably in the range of 6 to 8 ppm. Dissolved oxygen is adjusted in the oxygen supply chamber 27.
oxygen-containing gas from the pores of the oxygen supply member 28;
This can be easily done, for example, by adjusting the amount of air supplied. Although the oxygen supply member 28 is provided at the bottom of the seawater supply chamber 3 in FIG. 2, it may also be provided at the bottom of the cylindrical member group.

In the present invention, there is no particular restriction on the method of introducing larvae of caterpillars, lugworms, etc. into the medium 7, but generally they are grown into larvae in an incubation tank (not shown) and placed in the medium together with the sand on which the larvae have settled. It is appropriate to scatter and add so that 7 is formed. The larva grows to a body length of 5 to 10 cm in culture medium 7 and 7' while eating nutrients in seawater and feed administered as needed.
When they grow to a certain point, their ability to crawl into holes becomes stronger, and they pass through the mesh and holes of the porous member 6 from the culture medium 7, 7' one by one and settle in the nesting tubular member 5 of the tubular member group. Then, they nest in the nesting tubular member 5. In addition, since the larva stretches and shrinks, it can pass through the porous member 6 even if the mesh and pores of the porous member 6 are quite small, and since only one larva can fit into one hole, the nesting tubular member No two fish can fit into one tube hole.

Suitable feeds to be administered are diatoms, seaweeds, green algae, prawns, and eel culture feeds. By providing a net 29 in the upper water drainage section 19, it is possible to prevent the drain 21 from clogging with uneaten feed, filth, garbage, etc., and even if the larvae escape, they can be easily collected. .

Furthermore, nesting from the medium 7, 7' into the porous member 5 for nesting occurs naturally depending on the larva's habit, but by lowering the water level of the medium 7, 7', the larvae can nest in the porous member 5 for nesting. The transition can be carried out effectively. The water level can be easily adjusted by adjusting the positions of the drain ports 21 and 26, and it is generally preferable to position the drain ports 21 and 26 at a height similar to the top of the porous member 5 for nesting. It is.

The larvae that have grown in an environment equivalent to or better than the natural sea by circulating seawater to both the top surface of the culture medium 7, 7' and the bottom surface of the tubular member group, and nested in the nesting tubular member 5, After the larvae have nested in the respective nesting tubular members 5, the larvae are placed in a medium 7 in order to grow into adults in a short period of time without causing variations in the degree of growth. , 7' are removed, and the frame plate 13 and support member 1 are removed.
4 and the like are removed and reared until they become adults in a cylindrical nesting member 5. There is no need to lower the water level after removing the culture medium 7, 7', but
It is preferable to adjust the positions of 1 and 26 so that the water surface is about 1 to 3 cm above the top of the nesting tubular member 5.

The flow rate of the upper flowing water and the lower flowing water flowing to the top and bottom of the cylindrical member group when rearing and growing in the nesting cylindrical member 5 is opposite to that when rearing and growing in the medium 7, 7'. It is preferable to increase the amount of water flowing from the top than the amount of water flowing from the top, and the ratio between the amount of water flowing from the top V ₁ and the amount flowing from the bottom V ₂ (V ₁ /V ₂ ) is 6/4 to 7/3.
The degree is appropriate. If the lower flow water is larger than the upper flow water, the larvae will easily escape from under the tubular member 5, and when the larvae emit waste, they will turn around in the cylinder and do so with their butts facing upward, which will help wash away the waste. It is also better to allow more water to flow from the top. The temperature of seawater is about 15-25℃, and the amount of dissolved oxygen is about 5-25℃.
It is appropriate to adjust the amount to about 10 ppm, preferably about 6 to 8 ppm. By circulating seawater to both the top and bottom of the cylindrical member group, the breeding room 2 is not only kept clean at all times, but also kept warm with fresh seawater, creating a good living environment. It becomes possible to further promote the growth of larvae.

The adult insects reared and grown in the nesting cylindrical member 5 are taken out from the tank 1 with the adult insects entering the cylindrical hole 8 of the nesting cylindrical member 5. The adult insects taken out while still inside the nesting tubular member 5 may be taken out from the tube hole 8 and shipped, but if shipped without being taken out, the adults will remain intact and will not require special packaging. It has the great advantage of being able to be shipped with fresh insect bait and being easily stored for long periods at stores, allowing anglers to always enjoy fishing with fresh bait insects.

In addition, in Fig. 2, 9 is a drain pipe used when cleaning the upper part of the breeding room 2, and 10 is a drain pipe used when cleaning the bottom of the tank 1 or quickly draining water. be. Moreover, 11 is a drainage conduit.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the apparatus of the present invention, FIG. 2 is a sectional view taken along the line taken from FIG. 1, and FIG. 3 is a sectional view showing one embodiment of the cylindrical member. 1...tank, 2...breeding room, 3...seawater supply room,
4... Drainage chamber, 5... Cylindrical member for nesting, 6... Porous member, 7... Culture medium, 19... Drainage section for upper running water, 20... Drain pipe, 21... Drain port, 23...
Communication port, 24... lower water drainage section, 25... drain pipe, 26... drain port.

Claims (1)

[Claims] 1. A cylindrical member group consisting of a large number of nesting cylindrical members arranged vertically at desired intervals from the bottom of the tank in a tank having a seawater supply chamber and a drainage chamber; A breeding chamber formed by a porous member provided above the member group and a medium provided on the porous member is provided between the seawater supply chamber and the drainage chamber, feeding insect larvae are placed in the medium, and seawater is poured onto the surface of the medium. The larvae are grown in the medium and nested in the nesting tube while flowing seawater to the top of the medium and the bottom of the group of tubular members.The medium is removed and the larvae are grown into adults in the nesting tube. A method for cultivating bait insects for fishing, characterized by raising them up to 2. A seawater supply chamber is provided at one end of the tank, a drainage chamber is provided at the opposite end of the tank, and a breeding room is provided between the seawater supply room and the drainage room so that each chamber communicates with the bottom of the tank. A cylindrical member group consisting of a large number of nesting cylindrical members arranged vertically at desired intervals from the bottom, a porous member provided on the cylindrical member group, and a culture medium provided on the porous member. The drainage chamber is divided into an upper running water drainage part and a lower running water drainage part by a partition member that communicates at the bottom, and each drainage part has a drainage outlet located at a position higher than the top surface of the culture medium. A fishing bait insect farming device characterized by: