JP2009038999A - Crassostrea gigas-cultivating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Crassostrea gigas-cultivating apparatus capable of supplying the stably high-quality Crassostrea gigas over a year without requiring special technique, and to provide a Crassostrea gigas-cultivating method. <P>SOLUTION: The Crassostrea gigas-cultivating apparatus is equipped with a constant-temperature cultivation bath 10 for keeping the Crassostrea gigas cultivated to a harvest state at a cultivation temperature, a seawater-pretreating means 20 for feeding clear seawater to the constant-temperature cultivation bath 10, and a circulating means 30 for reusing the seawater in the constant-temperature cultivation bath 10 by cleaning the seawater. The cultivation temperature is preferably 10-13°C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a oyster farming apparatus and a oyster culture method that can provide oysters in a state of being taken in regardless of the seasons.

  Hiroshima oysters are famous for their large size and crispness, but many people think that oysters are seasonal in winter and not eaten in summer. This oyster is a oyster. In the case of Hiroshima-made oysters, the gonad develops between March and May, and the nutritionally taken oyster turns into a female and then becomes a thin, watery oyster by incubating and laying eggs. This is the reason why oysters are not eaten in summer. There is a need for a method or device that avoids this condition of oysters and allows them to eat delicious oysters throughout the year.

  In response to such a request, for example, when the temperature of seawater rises in the summer, the oyster is moved to a place where the water depth is deep and the seawater temperature is low, preventing oysters from becoming female, embracing or laying eggs. It has been made to prevent weight loss. Moreover, it is also possible to prevent the oysters from thinning by preparing a triploid of a oyster using a method for producing a tetraploid of a mollusc as proposed in Patent Document 1, and preventing the formation of a female. Has been made.

  On the other hand, although it is not the case of a oyster, the rock oyster having the same problem of weight loss as a oyster is described in Patent Document 2 in the period from when the seawater temperature is substantially highest to when it begins to descend. Remove the cultured rock oysters that have been cultivated in the seawater, give physical and / or chemical stimulation to promote egg release and fertilization, and then return to the seawater for a short time. A method for cultivating rock oysters has been proposed, characterized in that the oyster oysters are produced in the winter season by completing the egg laying and fertilization, and then continuing the cultivation until winter to restore and regain the soft body weight. .

Japanese National Patent Publication No. 10-501401 Japanese Patent Laid-Open No. 11-32619

  However, the method of moving a oyster to a place where the water depth is deep and the seawater temperature is low depending on the time or seawater temperature is troublesome, and there is a problem that proper temperature management cannot be performed. There is also a problem that the oxygen amount necessary for the growth of oysters cannot be secured because the amount of oxygen is small at deep water. For this reason, it is not easy to provide a stable and high-quality oyster, because it is not easy to keep the oyster in a well-maintained state (cultivation) while the oyster is nourishing while being nourishing There is.

  Moreover, the method of producing a triploid of oyster and culturing it has a problem that the cost becomes high, and there is a problem that a special technique and a culture method are required to produce the triploid. It is conceivable to use the method proposed in Patent Document 2 for oysters, but the method is to artificially adjust the ovulation and fertilization period, so be sure to be thin after ovulation There is a problem that exists.

  The present invention is a oyster farming device that can supply stable and high-quality oysters throughout the year without requiring special technology in view of such conventional problems and the desire to eat delicious oysters throughout the year. And it aims at providing the culture method of a oyster.

  A oyster farming device according to the present invention includes a thermostat bath for maintaining oysters cultivated in a grown state at a farm temperature, seawater pretreatment means for supplying clean seawater to the farm thermostat tank, Circulation means for purifying seawater and reusing it. And in this invention, it is good for the cultivation temperature to be 10-13 degreeC.

  Moreover, in the said invention, it is good to have further the pre-cooling tank which pre-cools the oyster taken out from the culture thermostat, and the aging tank which maintains the pre-cooled oyster at -0.8--1.5 degreeC. And in this invention, it is good for the cooling rate of the oyster in a pre-cooling tank to be -1 degreeC / 2-3h.

  The method of cultivating oysters according to the present invention takes oysters cultivated in the state of intake from the sea, cultivates them in clean, circulating seawater at 10 to 13 ° C., and cultivates the oysters cultivated before eating -0.8 -1.5 ℃ clean, carried out by aging in circulating seawater.

  The oyster farming device according to the present invention can supply stable and high-quality oysters throughout the year without requiring a special technique. Moreover, the culture method of the oyster which can make such a stable high quality oyster can be easily implemented by utilizing the said oyster storage apparatus.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a layout diagram illustrating a postcard farming apparatus according to the present invention. As shown in FIG. 1, the oyster farming apparatus includes a thermostatic bath 10 that maintains oysters cultured in a state of cultivation at a cultivation temperature, and seawater pretreatment means 20 that supplies clean seawater to the cultivation thermostat 10. And circulating means 30 for purifying seawater in the storage thermostat 10 and reusing it.

  The storage thermostat 10 is a thermostat that is maintained at a predetermined temperature, for example, a predetermined temperature of 10 to 13 ° C., for feeding the oysters that are nourished and cultivated in a grown state. Clean seawater circulates in the storage thermostat 10, and oysters stored in oyster baskets or oyster shelves are cultivated while feeding on plankton floating in the seawater. A temperature of 10 to 13 ° C. is preferable because it is a temperature at which oysters can be prevented from becoming female, and is also a temperature at which plankton in seawater is likely to grow.

  When oysters are housed in an oyster basket and farmed, the circulation of seawater is performed smoothly and the oysters can move in the oyster basket.

  The seawater pretreatment means 20 has a function of precooling the seawater pumped from the sea to a predetermined temperature and supplying the seawater to the thermostat bath 10 as clean seawater. For example, as shown in FIG. 1, seawater is pumped by the pump 23 into the seawater pretreatment tank 21 through the filter 24. Then, the pumped-up seawater is cooled to a predetermined temperature by the cooling device 22, and the microbubble generator attached to the seawater pretreatment tank 21 generates fine air bubbles of 50 μm or less and / or nanometer order. It is being cleaned by nanobubble generators and UV light emitting devices that generate fine air bubbles. The purified seawater is supplied to the storage thermostat 10 by the pump 25.

  The circulation means 30 has a function of purifying and circulating the seawater in the storage thermostat 10. For example, as shown in FIG. 1, seawater in the thermostatic bath 10 is circulated through the filter 35 by the pump 34 and simultaneously cooled by the cooling device 33. A means for mixing fresh water into the seawater can be attached to the circulation means 30. This is preferable because phytoplankton can be grown.

  Moreover, it is preferable to attach a device similar to the above-described microbubble generator to the thermostat bath 10. Thereby, seawater can be purified by the action of fine air bubbles (microbubbles) and the filter 35.

  As shown in FIG. 1, the oyster storage device is preferably provided with an aging tank 50 for aging oysters taken out from the storage thermostat 10 for a predetermined period. Thereby, the oyster of the optimal state with umami can be provided. In this case, the seawater temperature in the aging tank 50 is preferably maintained at about -0.8 to -1.5 ° C. The aging period can be about 1 to 2 weeks.

  When the oyster is taken out from the storage thermostat 10 and transferred to the aging tank 50, it is not preferable to cool the oyster rapidly from the temperature of the storage thermostat 10 to the temperature of the aging tank 50. For example, if oysters are cooled at -1 ° C / h, half of them may die. For this reason, the cooling rate of oysters should be in the range of -1 ° C / 2-3h. A precooling tank 60 is provided as shown in Fig. 1, and the oysters taken out from the storage thermostat 10 are stored in the precooling tank 60. After sufficiently cooling at a predetermined cooling rate, it may be transferred to the aging tank 50.

  By treating the oysters at a low temperature (aging) in the aging tank 50 as described above, it is possible to increase the umami component (glycogen) without freezing the oyster cells. To maintain the aging tank 50 at this temperature, it is preferable to use seawater slurry ice. For example, as shown in FIG. 1, the seawater slurry ice can be easily supplied by making the cooled seawater obtained by the seawater pretreatment means 20 using a slurry ice making machine 58.

  The aging tank 50 is preferably provided with a pump 54 and a filter 55 as shown in FIG. 1 so that the seawater in the aging tank 50 is circulated and purified. Moreover, it is good to provide a nanobubble generator.

It is a layout figure of the oyster farming device concerning the present invention.

Explanation of symbols

10 Farming bath
20 Seawater pretreatment means
21 Seawater pretreatment tank
22 Cooling device
23 Pump
24 filters
25 Pump
30 Circulation means
33 Cooling device
34 Pump
35 Filter
50 Aging tank
54 Pump
55 Filter
58 slurry ice machine
60 Pre-cooling tank

Claims (5)

  A thermostat bath for maintaining cultivated oysters at a farm temperature, seawater pretreatment means for supplying clean seawater to the farm thermostat tank, and purifying the seawater in the farm thermostat tank for reuse A oyster farming device having circulation means.   The oyster cultivation device according to claim 1, wherein the cultivation temperature is 10 to 13 ° C.   Furthermore, the oyster storage apparatus of Claim 1 or 2 which has a pre-cooling tank which pre-cools the oyster taken out from the storage thermostat, and an aging tank which maintains the pre-cooled oyster at -0.8 to -1.5 degreeC.   The oyster cultivation apparatus according to claim 3, wherein a cooling rate of the oyster in the precooling tank is -1 ° C / 2 to 3h.   Taking oysters cultivated in the state of intake from the sea, raising them in clean, circulating seawater at 10-13 ° C, and cultivating the oysters cultivated in circulated seawater at -0.8 to -1.5 ° C before eating A method of cultivating oysters that are aged in

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