JPH04325039A - Culture of tilapia - Google Patents

Abstract

PURPOSE:To culture tilapia with the minimum hand at low cost by preparing an automatic device of continuously preparing algae, taking out algae cultured in a culture tank in a culture solution as it is, adding the algae to a water tank of raising tilapia and automatically changing part of water. CONSTITUTION:An automatic device of continuously preparing algae is installed side by side with facilities of culturing tilapia to carry out both raising tilapia and culturing algae. A culture solution containing algae multiplied by the culture is fed as it is to a water tank 1 of raising tilapia, the algae in the culture solution are taken in tilapia and the whole operations are systematized so that supply of culture solution to continuously culture algae and change of water to maintain clarity of raising water are automatically carried out to culture tilapia.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automated method for cultivating tilapia, which allows tilapia to be cultured with minimal manpower and at low cost.

0002

[Prior art] Tropical freshwater fish of the order Perciformes and family Cichlidae.
Tilapia is delicious as sashimi, so in recent years it has been cultivated domestically and sold commercially as a food fish. However, in the conventional tilapia farming method that uses compound feed made from expensive raw materials such as fish meal, meat meal, rice bran, and grains, the cost of feed accounts for more than 1/3 of the total farming cost. Since storage, administration, etc. require time and skill, there is a need for the development of a more economically advantageous and simple cultivation method. On the other hand, in the natural world, tilapia is known to grow mainly by ingesting blue-green algae such as Spirulina, Microcystis, and Anabaena. Tilapia farming has also been attempted, but
Because it takes time and money to harvest blue-green algae and process it into feed, and because it is difficult to provide a stable supply through natural reproduction, it has not been an advantageous aquaculture method.

0003

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a more advantageous method for cultivating tilapia using blue-green algae as feed.

0004

[Means for Solving the Problems] The tilapia farming method of the present invention, which has succeeded in achieving the above object, is capable of raising tilapia by attaching an automatic continuous culturing device for algae that can be used as feed for tilapia to the tilapia farming equipment. An operation in which algae cultivation is carried out in parallel, and a part of the culture solution containing algae grown by the cultivation is taken out from the culture tank of the automatic continuous algae culture device at a predetermined time and supplied as is to the tilapia rearing tank;
Immediately replenish fresh culture solution to the culture tank where the culture solution has decreased due to the removal of the culture solution, and add fresh culture solution to the culture tank after the algae in the culture solution is ingested by the tilapia. This system is characterized in that the operations of supplying water and exchanging part of the water in the rearing tank are automated using a control device.

[0005]

[Operation] In the tilapia cultivation method of the present invention, first, an automatic continuous cultivation device for algae that can be used as feed for tilapia, such as the aforementioned blue-green algae, is prepared near the tilapia cultivation equipment. This culture device is capable of automatically replenishing the culture solution for the algae to be cultured, and managing the temperature and lighting of the culture tank. However, it is not necessary to prepare a device to separate and harvest the grown algae from the culture solution. This culture device shall be capable of producing a sufficient amount of algae in accordance with the amount of feed (algae) required by tilapia in the combined culture tank. A pipe with a pump is provided between the culture tank and the breeding tank for transferring the culture solution in the former to the breeding tank.

[0006] The algae grown in the culture tank are taken out of the culture tank and put into a tilapia rearing aquarium in the same state as the culture solution, so that the tilapia can ingest them. Therefore, it is necessary to remove the culture solution containing the amount of algae necessary for one feeding from the culture tank and transfer it to the breeding tank, but this is done using piping that connects the culture tank and the breeding tank. . Feeding performed in this manner is carried out by the control device operating the pump of the culture fluid transfer piping at a predetermined time and for a predetermined time. The amount of culture solution transferred for one feeding, that is, the pump operation time, is calculated based on the average algae concentration in the culture solution and the required amount of feed, and this is input into the control device along with the feeding interval. I'll keep it.

[0007] The culture tank from which the culture solution has been taken out for feeding is immediately replenished with fresh culture solution so that algae production can continue. On the other hand, after the tilapia ingests the algae in the culture solution put into the breeding tank, the culture solution and uneaten algae remain. Therefore, at an appropriate time after each feeding, or at an appropriate time after multiple feedings, some of the breeding water in the breeding tank is drained outside the tank and fresh water is supplied instead to prevent contamination of the breeding water. prevent. The breeding water extracted from the breeding tank is either discarded or purified and reused as breeding water. These operations are also automated using a control device. The breeding water may be discharged from the breeding aquarium by overflowing when the culture solution or water flows into the tank.

[0008]

EXAMPLE Tilapia was cultured according to the culture method of the present invention using the illustrated apparatus. The breeding tank 1 used was
It is a conventional one having a water supply pipe 3 with a pump 2, an overflow water outlet 4, and a bubble blowing device 5. The blue-green algae culture tank 6 has a transparent side, and is illuminated by a lighting device 7 installed on that side. Further, a culture solution supply pipe 9 equipped with a pump 8 opens near the liquid surface, and fresh culture solution is supplied from there. Inside the culture tank 6, a cooling pipe 10 for flowing cold water is used to prevent an excessive temperature rise, and an air stone 11 is used to blow in carbon dioxide mixed air necessary for carbon assimilation. ing. The culture tank 6 is connected to the breeding tank 1 by a pipe 12, and a pump 13 is provided in the middle. The operations of the pumps 2, 8, and 13 are all controlled by the control device 14, and the pump 13 transfers a certain amount of culture solution to the breeding tank 1, followed by the pump 8 replenishing the culture solution to the culture tank 6 and pumping. 2, water is injected into the breeding aquarium 1.

Spirulina is cultured in the above-mentioned culture tank 6 with a capacity of 50 liters, and the culture solution in the tank is supplied by the pump 13 at 12.5 liters per day, 2 times a day, while sequentially replenishing fresh culture solution from the culture solution supply pipe 9. When pulled out in batches and sent to breeding tank 1, the growth rate is approximately 0.5g/l/day.
The average algae concentration was able to be maintained at approximately 2.0 g/l. Therefore, approximately 25g of algae can be supplied to breeding tank 1 per day, which is approximately 200g in weight.
It was enough to feed 10 tilapia.

0010

[Effect of the invention] As mentioned above, an automatic continuous algae culturing device is attached to the tilapia cultivation equipment, tilapia rearing and algae cultivation are carried out in parallel, and the culture solution containing the algae grown by the cultivation is directly used for tilapia cultivation. In addition to supplying algae to the breeding aquarium and allowing the tilapia to ingest the algae therein, the culture solution for continuous cultivation of algae and the water change to maintain the cleanliness of the breeding water are also automatically performed. According to the systemized system of the present invention, not only the feed cost is significantly reduced, but also the management cost is significantly lower than the method of using expensive compounded feed or the method of separating and administering blue-green algae from the culture solution. , it becomes possible to produce tilapia more cheaply than before.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an apparatus used to implement the present invention.

[Explanation of symbols]

1: Breeding tank
2, 8, 13: Pump 3: Water supply pipe
4: Breeding water outlet 6: Blue-green algae culture tank
9: Culture solution supply pipe 14: Control device

Claims (1)

[Claims] [Claim 1] An automatic continuous cultivation device for algae that can be used as feed for tilapia is attached to the tilapia cultivation equipment, and tilapia rearing and algae cultivation are carried out in parallel, and a part of the culture solution containing algae grown by the cultivation is an operation of removing the culture solution from the culture tank of the automatic continuous algae culture device at a predetermined time and supplying it directly to the tilapia rearing tank, an operation of immediately replenishing the culture tank with fresh culture solution from which the culture solution has decreased due to the removal of the culture solution, and After the algae in the culture solution supplied to the breeding tank is ingested by the tilapia, a control device is used to automate the operation of supplying fresh water to the breeding tank and replacing part of the water in the breeding tank. A method for cultivating tilapia, which is characterized by: