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A water quality improvement method for cultivating grouper fry

A water quality improvement and fish fry technology, which is applied in the field of water quality improvement method for cultivating grouper fry, can solve the problems of seedling failure, excessive fry excretion, and decreased survival rate of seedlings

Active Publication Date: 2020-10-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small water body in the cement pool, it is more difficult to control and improve various bacterial colonies and algae in the water body of the seedlings, and it is difficult to form a stable and healthy water ecosystem; The fish fry excrement a lot, and it is often necessary to suck the bottom during the seedling cultivation process in the cement pond, which frightens the fry and makes them unwilling to eat again, resulting in a decrease in the survival rate of the seedlings; the metabolic waste and excrement of the seedlings at different stages of development Different amounts of metabolic waste will lead to changes in the micro-ecological environment of the water body, deterioration of water quality, proliferation of harmful bacteria, and the failure of the entire cultivation

Method used

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  • A water quality improvement method for cultivating grouper fry
  • A water quality improvement method for cultivating grouper fry
  • A water quality improvement method for cultivating grouper fry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of water quality improvement method of cultivating grouper fry provided by the present embodiment, the place of cultivating seedlings is Sanya, Hainan, adopting cement pond to cultivate seedlings, the time is April 2014, and concrete steps are as follows:

[0045] (1) In the preparation stage of the seedling pool, the design and transformation of the cement pool, the seedling pool is 4 meters wide, 8 meters long, and 1.5 meters high indoor cement pool. Clean the sand and arrange an air stone every 1.5 meters. Add 0.15-meter-high clean seawater to the pool, add strong chlorine to disinfect at an amount of 5g / ton of seawater, aerate for one day, and use 15g / m 3 After the sodium thiosulfate is dechlorinated, fresh seawater is injected to a position 10cm away from the pool mouth, which is 1.4 meters high.

[0046] (2) For water quality control in the stage before laying eggs, add 50mL / m to the seawater treated in the previous step 3 Sprinkle the fermented peanut br...

Embodiment 2

[0056] A kind of water quality improvement method of cultivating grouper fry provided by the present embodiment, the place of cultivating seedlings is Sanya, Hainan, adopts soil pond cultivating seedlings, and the time is April 2014, and concrete steps are as follows:

[0057] (1) In the preparation stage of the seedling pond and the preparation of the earth pond, select an earth pond with a size of 2 mu and a depth of 2.5 meters, drain the water, expose the bottom of the pond to the sun for 3 days, sterilize it with the sun's ultraviolet rays, and then dry it evenly Quicklime 50kg / mu, add 20cm deep seawater, expose to the sun for three days and inject fresh seawater to 2m deep.

[0058] (2) Water quality control in the stage before laying eggs, add 50mL / m to the seawater treated in the previous step 3 Sprinkle the fermented peanut bran evenly, and add 0.5g / m 3 photosynthetic bacteria dry powder and 0.3g / m 3 Bacillus subtilis, cultivated under light conditions for 4 days, du...

Embodiment 3

[0068] The steps are similar to those in Example 1, the difference is that the seedlings were selected in Daya Bay, Guangdong, in September 2015, and the size of the cement pool used was 5 meters long, 5 meters wide, and 1.5 meters high. The rest of the water quality improvement conditions are the same; also in the early stage and late stage of the seedlings, the water quality of the seedlings is improved by using peanut bran, photosynthetic bacteria and Bacillus subtilis. Successfully cultivated 25,000 fry, with a survival rate of 31%.

[0069] Table 1 The contrast of the inventive method and common cement pool method for cultivating seedlings

[0070]

[0071]

[0072] Table 2 The contrast of the inventive method and common soil pond method for cultivating seedlings

[0073]

[0074] Show according to the data in table 1, table 2, use water quality improvement method of the present invention except can significantly improve seedling success rate and fry survival ra...

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Abstract

The invention provides a water quality improvement method for grouper fry culture. The method comprises steps as follows: preparation of a fry culture pond; water quality control at the stage before egg feeding; setting of egg feeding density; improvement of water quality at early stage of fry culture; water system balance improvement at late stage of fry culture. According to the characteristicsof growth and metabolism of grouper fries at different fry culture stages, water quality improvement for the grouper fry culture is performed under cooperative use of peanut bran, photosynthetic bacteria and bacillus subtilis. The method is simple, easy, high in controllability and low in cost, the fry culture time can be greatly shortened, and success rate of fry culture in a cement pond and emergence rate of unit area can be increased.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a water quality improvement method for cultivating grouper fry. Background technique [0002] Grouper is a world-renowned fish cultured in seawater, belonging to Perciformes (Perciformes), Serranidae (Serranidae), grouper subfamily (Epinephelinae). Grouper is deeply loved by consumers because of its delicious meat and rich nutrition. Grouper has an important economic status in my country's marine aquaculture industry. Guangdong, Hainan, Fujian, Guangxi and other provinces along the southern coast of my country have already made grouper Spotted fish is listed as the main mariculture object, and its economic value is huge. [0003] It takes a relatively long period of growth and metamorphosis for grouper to hatch from fertilized eggs to develop into seedlings. In the process of raising seedlings, the fertilized eggs of grouper often fail to develop into seedlings du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34A01K61/10
CPCA01K61/10C02F3/34C02F2301/08Y02A40/81
Inventor 李水生王庆张勇赵密彭诚陈嘉兴刘云张海发林浩然
Owner SUN YAT SEN UNIV