Graded culture method for large yellow croaker fry

A cultivation method and technology for large yellow croaker, applied in the field of grading cultivation of large yellow croaker fry, can solve the problems of poor adaptability to the breeding environment, uneven fry specifications, slow fry growth rate, etc. Effects of increased speed and survival rate

Inactive Publication Date: 2011-06-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The authorized announcement number is CN1140171, each of which is called the invention patent of the cultivation method of black sea bream fry and fish fingerlings, and discloses that the black sea bream fry is first cultivated in an indoor seawater cement pond for 20 days, and then the fry are moved out to an outdoor seawater soil pond for cultivation. Method, although this method divides black sea bream fry into indoor and

Method used

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Examples

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Effect test

Embodiment 1

[0013] A hierarchical cultivation method for large yellow croaker fry, primary cultivation: build an indoor nursery pond with a length of 5.0m, a width of 4.0m and a height of 1.5m, put in clean seawater until the water depth is 1.4m, and inoculate chlorella to cultivate light green For nursery water, the water temperature is controlled at 24-29°C, the specific gravity is 1.018-1.022, and the dissolved oxygen is not less than 4 mg / L. Transfer the fertilized eggs of 300,000 to 450,000 large yellow croakers to be hatched into the indoor cultivation pool for hydrostatic cultivation to allow fertilization. The larvae are larvae after the eggs emerge from the membrane. The larvae use rotifers as bait from the 3rd to the 7th day after the larvae emerge from the membrane. The number of rotifers per liter of nursery water is 5,000-10,000. , the number of Artemia per liter of nursery water is 1000-5000, and the larvae start to use copepods as bait on the 12th day after the larvae emerge...

Embodiment 2

[0015] It is basically the same as in Example 1, except for the primary cultivation: the number of fertilized eggs is about 400,000, the number of rotifers is about 8,000, the number of Artemia is about 3,000, and the number of copepods is about 15,000. The amount of feeding eel meal in the morning is about 2% of the total amount of larvae, and the daily feeding amount fortified with eel meal is about 5% of the total amount of larvae; The daily feeding amount of powder is about 5% of the total amount of larvae; the density of fry is about 60,000 in the second level of cultivation; the density of fry in the fourth level of cultivation is about 35,000; % or so, the range of left and right in this embodiment refers to within ±5% of each numerical value.

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Abstract

The invention discloses a graded culture method for large yellow croaker fry, which comprises the following steps of: performing fertilized egg incubation and membrane broken juvenile fish culture in an indoor nursery pond; when 20 percent of juvenile fish is cultured to reach the body length of 20 millimeters, training the juvenile fish by using a proper amount of eel powder and feed in the morning; when 50 percent of juvenile fish is cultured to reach the body length of 20 millimeters, performing reinforced training for 3 days by using full eel powder; transferring the fry with body length of not less than 20 millimeters to an outdoor secondary net cage for culture, wherein the culture density of the secondary net cage is 90 to 110 thousand pieces; transferring the fry with body length of not less than 30 millimeters to an outdoor tertiary net cage for culture, wherein the culture density of the tertiary net cage is 50 to 70 thousand pieces; transferring the fry with body length of not less than 40 millimeters to an outdoor quaternary net cage for culture, wherein the culture density of the quaternary net cage is 30 to 40 thousand pieces; and when 95 percent of fry is cultured to the body length of not less than 50 millimeters, obtaining the large yellow croaker fry capable of being put to breed. The graded culture method for the large yellow croaker fry has regular fry specification, high fry growth speed, high survival rate and good adaptability of the fry to the culture environment.

Description

technical field [0001] The invention relates to the cultivation of large yellow croaker fry, in particular to a hierarchical cultivation method of large yellow croaker fry. Background technique [0002] The cultivation of large yellow croaker fry is a process from hatching to larvae being cultivated to be more than 50mm in length and can be stocked. At present, large yellow croaker fry are generally hatched and cultivated in the indoor breeding ponds of the hatchery. From hatching to larvae, the fry with a size of 50 mm or more are cultivated in the same breeding pond; in this way, the specifications of the fry that emerge are uneven, and the fry are still suitable for indoor cultivation. The environment of the pond, and when fry are stocked in a suitable place to breed, the culture environment difference is bigger, and fry often can produce the stress response of different degree in the new environment, and the survival rate of fry is just lower during breeding. The author...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 徐永健卢光明陆慧贤孙斌戴广谱葛奇伟
Owner NINGBO UNIV
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