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Control method for cultivation density of smelt

A technology of breeding density and control method, applied in fish farming, application, climate change adaptation, etc., can solve the problems of increasing unit cost, wasting water, lack of oxygen, etc., and achieve the effect of reducing unit cost and increasing yield per mu

Inactive Publication Date: 2008-09-24
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, the sweetfish farming industry has developed rapidly and the scale has continued to expand. However, the control of the breeding density of sweetfish by breeding units currently lacks theoretical support and scientific and reasonable basis. It is generally carried out based on practical experience. High, and cause slow growth, individual thin and small, and even cause hypoxia and a large number of deaths, the survival rate is lower than 70%; and some for the sake of insurance, stocking with a lower density, although the survival rate can be about 70%, and wasted water body, reducing output, increasing unit cost, and reducing economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for controlling the breeding density of sweetfish, the measured surface area of ​​the water body is 300m 2 , the water depth is 1m, then the volume V of the water body is 300m 3 , the average body weight G of sweetfish raised is 0.04kg, and its oxygen consumption rate R is found to be 0.38g / kg.h from Table 2. It is set to change the water body 3 times a day, so the total water change is 3×300. The flow rate Q of injected water per hour in a cubic meter of water body is 3×300÷24×300=0.125m 3 / h.m 3 , the measured water temperature of the injected water is 24°C, find out the dissolved oxygen amount A of the injected water at this time from Table 1 1 8.25g / m 3 , under the condition of no additional oxygenation, the saturated dissolved oxygen amount A of the water body is the dissolved oxygen amount A of the injected water 1 According to the formula W=(A-2g / m 3 )×Q / R, the total weight of sweetfish that can be cultured per cubic water body is 2.056kg / m 3 , tha...

Embodiment 2

[0020] It is basically the same as Example 1, except that the average body weight G of the sweetfish raised is 0.1kg, and the water body is changed 6 times every day, from which the W is 4.46kg / m 3 , X is 13380 tails.

Embodiment 3

[0022] A method for controlling the breeding density of sweetfish, the volume V of the water body is 200m 3 , the average weight G of sweetfish is 0.0025kg, its oxygen consumption rate R is 0.42g / kg.h, the water body is changed once a day, and the flow rate Q of injected water is 0.0417m 3 / h.m 3 , the water temperature of the injected water is 18°C, and the dissolved oxygen amount A of the injected water is found 1 9.18g / m 3 , using a 0.75kw water wheel aerator, starting for 18 hours, the average amount of oxygen per cubic meter of water per hour per day A 2 4.5g / m 3 , the saturated dissolved oxygen amount A of the water body is A 1 with A 1 The sum, the same calculation method as in Example 1, calculates that W is 1.16kg / m 3 , taking the survival rate coefficient J as 0.8, then X is 106057 tails.

[0023] The method for controlling the breeding density of sweetfish of the present invention is not limited to the above-mentioned embodiments, and the breeding density can...

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PUM

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Abstract

The invention discloses a control method for the breeding density of sweet fish. The middleweight G of the sweet fish which are bred is weighted through mensurating the volume V of a breeding water body, the consumption rate R of the sweet fish with the weight is found out, the flux Q of the poured water every hour in the water body per stere is set, the saturated dissolved oxygen A of the water body is found out and / or calculated, thus the gross weight of the sweet fish which can be bred in the water body per stere can be obtained by calculating according to a formula that W is equal to A minus 2g / m<3> *Q / R, and then the quantity of the sweet fish with the middleweight in the breeding water body can be obtained by calculating according to the other formula that X is equal to W*V / JG; thus not only the specific yield for breeding the sweet fish can be improved, at the same time, the unit cost can be reduced by about 20 percent, but also the survival rate which is about 70 percent is not lower than the breeding with lower density, and the survival rate in a high pond can reach 90 percent.

Description

technical field [0001] The invention relates to the cultivation of sweetfish, in particular to a method for controlling the cultivation density of sweetfish. Background technique [0002] Sweetfish (Pleccoglossus altivelis Temminck et Sohlegel) is a small, famous and valuable economic fish, which is named after bursts of fragrance. Ayu has been regarded as a rare fish among edible fish since the Ming Dynasty because of its tender meat, delicate fragrance and no fishy smell, and it is golden yellow after being dried by fire. , And as a tribute to the palace, many poets and poets said in a poem: "Ayu from Yanshan Mountain has a sweet fragrance, and its color is like gold, and it can be carried for thousands of miles." Sweetfish is a kind of aquatic product with high economic value and broad development prospects. Sweetfish has always had a high price in my country, and the market price of fresh fish is as high as 80 yuan / kg, which is about 400 Taiwan dollars / kg in Taiwan. kg,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 李明云陈炯史雨红俞爱家
Owner NINGBO UNIV