Method for cultivating loach larvae by arranging net cages in pond

Abstract

The invention discloses a method for cultivating loach larvae by arranging net cages in a pond to improve the rate of survival. The method mainly comprises the steps that firstly, the pond which is appropriate in area and water depth is selected, water is injected into the pond to clean and disinfect the pond, and palatable bait is prepared; secondly, the net cages with the total area being 10% of the area of the pond are arranged inside the pond, wherein each net cage conforms to the standard of (5-8)m*1m*0.7m, the net mesh is 60, the net cages are evenly arranged along the long edges of the pond in a multi-line and two-row mode, and the cage bottoms are close to the bottom of the pond but not make contact with the bottom mud when the net cages are fixed; thirdly, four submerged pumps are installed at the four corners of the pond, and pond circulating small-flow water is formed by adjusting the direction of a water outlet; fourthly, loach larvae are thrown into the net cages according to the demand of 2250-3000 loach larvae per square meter, the submerged pumps are started, and wheel animalcule and other palatable bait enter the net cages along water flow to be eaten by the loach larvae; fifthly, unobstructed exchanging of water inside and outside the net cages is guaranteed, and the bait is thrown into the net cages in due time to ensure adequate bait; sixthly, the loach larvae are moved out of the net cages when growing to be 2 centimeters long, the net is dragged out, aquatic insects in water are removed, then the loach larvae are moved to the pond to be bred, the bait is thrown into the pond in due time, and the loach larvae are bred to be larvae being 4 centimeters to 5 centimeters long.

Description

technical field [0001] The invention belongs to the field of aquaculture. It specifically relates to a method for effectively improving the survival rate by arranging net cages in ponds to cultivate loach seedlings. Background of the invention [0002] With the improvement of people's living standards, loach with delicious taste and medicinal value is more and more favored by consumers. Since natural loach resources are far from meeting the needs of the market, artificially cultured loach is developing rapidly, and the market is demanding large-scale products in batches. The demand for loach seed is strong. Cultivation of loach seedlings can be carried out in water bodies such as cement ponds and ponds. The cultivation of fish species in ponds has the advantages of large area, stable water environment, easy bait cultivation, and low comprehensive cost. It is an important way to cultivate seedlings on a large scale. But at present in the pond culture process, there is gener...

AI Technical Summary

Problems solved by technology

But at present in the pond culture process, there is generally the problem that the survival rate of loach seedlings is too low. According to our survey statistics, the survival rate of loach water flowers cultivated to 4-5cm size seedlings in ponds is only 5-10%. The low survival rate of breeding seriously restricts the large-scale production of loach

The main reason leading to such a low survival rate is that loach seedlings have a special external gill stage, that is, there are exposed gill filaments protruding from the gill cavity at the stage of about 15 days after the emergence of the film. The gills are easily damaged or trapped in the mud at the bottom of the pond, causing a large number of fry to suffocate and die; second, the ponds where the loach seedlings are cultivated are particularly prone to induce a large number of aquatic insects such as dragonfly larvae after fertilization, and the loach seedlings are preyed on by aquatic insects, resulting in a decrease in survival rate

Some of the existing published literature and patents relate to the technology of cultivating loach seedlings in ponds. The invention patent (authorized notification number CN101647420B) discloses a method for cultivating open bait for loach seedlings with biological fertilizers; Breeding method, its key point is to improve loach induced labor rate; Open patent (CN200810021131.2) discloses a kind of loach seedling culture technology, mainly through pond splashing soya-bean milk or paddy field breeding loach; Open patent (CN102893936A) discloses a large scale A method for cultivating loach fry, which is a cement pond cultivation method; a published patent (CN103109767A) discloses a method for artificially cultivating loach fry, which mainly adopts indoor cultivation before the age of 15 days, and transfers to outdoor cultivation after the age of 15 days; the published patent (CN102405865A) discloses a breeding method from loach fry to summer flower fish fingerlings, mainly using different oxygenation methods before and after loach fry with a size of 2cm to improve the survival rate of fry; the open patent (CN102763614A) discloses a method using net cages The innovation of the method of cultivating loach is that the bottom of the cage is made of a metal panel, and mud is spread on the bottom of the box for culturing loach, so as to solve the problem of low recapture rate of adult loach; none of the above technologies can solve the process of cultivating loach seedlings in ponds in a targeted manner. Vulnerability of the middle and outer gills, suffocation and predation by aquatic insects are two key issues that lead to low survival rates

Images