Leech fry ecological three-dimensional culture method

A technology of three-dimensional culture and leech, which is applied in fish farming, application, climate change adaptation, etc., can solve the problems of leech seedling stress, difficulty of residual bait, stuck, etc., so as to improve the survival rate and reduce the difficulty of cleaning residual bait , The effect of purifying water quality

Inactive Publication Date: 2016-01-06
JIANGSU AGRI ANIMAL HUSBANDRY VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Egg yolk is not easy to be eaten by leech seedlings in time, and it decomposes quickly and easily spoils water quality; small screws have poor viability and are easy to die after transportation; the proportion of broken screws that are eaten by leech seedlings is very small; dead small screws and Crushed screws and these residual baits are high-protein substances, which are easy to decompose in water and consume a large amount of dissolved oxygen, and at the same time release a large amount of toxic substances such as hydrogen sulfide and ammonia nitrogen
If these harmful substances are not removed in time, the leech seedlings will die as long as they accumulate in the pond for 1 day, and 50% of them may die after 2 days.
At the same time, it is very difficult to clean up these residual baits. It is not only difficult to clean them up by changing water and washing, but it is also easy to cause leech seedlings to be stressed or get stuck when they drill into the cage with the water flow.

Method used

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  • Leech fry ecological three-dimensional culture method
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  • Leech fry ecological three-dimensional culture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Choose 10 rectangular ordinary cement pools, the size of which is 1.8m x 4m x 1.5m. There is an 80-mesh net at the drain pipe to prevent leeches from escaping. There are aeration stones at the bottom of the pool. On May 20, 30 cm of water was introduced and aeration was carried out for 72 hours. The hatched leech seedlings were released on May 23, with a density of 20,000 seedlings / m 2 , put in 400 g / m of small screws with a weight of about 0.04 g 2 , 2.8 kg per pool. Then, 200 g / pond of Chinese squid with a body weight of less than 0.5 g / tail can be put in. Change the water every 2 days. When changing the water, reduce the water level to about 2 cm and add water to the original height. On the 4th day, about 0.06 grams of large and small screws were added to each pond, and on the eighth day, 6.3 kg and 4.2 kg of screws of about 0.1 grams were added. For a total of 10 days of cultivation, 40 leeches were randomly selected every other day, weighed, averaged, and reco...

Embodiment 2

[0022] The selected area is about 3000 meters 2 An ordinary earthen pond, in which a net cage with a mesh size of 60 mu is suspended by piling. The size of the net cage is 2 meters long x 1 meter wide x 0.5 meters high. There is a water inlet pipe at one end of the earthen pond and a drain pipe at the other end. The aeration stones are suspended in the net cages and oxygenated with a blower. On May 26, 40 cm of water was introduced and aeration was carried out for 2 days. On the morning of May 29th, the hatched leech seedlings were placed at a density of 10,000 seedlings / m 2 , throw in crushed screws 500 g / m 2 , 1 kg per cage. Then, 100 grams / pond of Chinese squid with a body weight of less than 0.5 grams / tail can be put in. Change the water every 2 days. When changing the water, reduce the water level to about 2 cm and add water to the original height. Add 500 grams of crushed screw meat to each pool every day, stop feeding crushed screws on the 6th day, and put in 600 ...

Embodiment 3

[0026] Choose a rectangular cement pool, running north-south, with a size of 50m x 2.4m x 0.4m, with a 40cm x 40cm sewage ditch in the middle; hang a cage with a mesh size of 60 mu on it by pulling a wire The size of the box is 2 meters long × 1 meter wide × 0.5 meters high, running north-south, with a sunshade net on the top. There is a water inlet pipe at one end of the cement pool and a drain pipe at the other end. The aeration stones are suspended in the net cages and oxygenated with a blower. On May 15th, hang the net cage, and on May 20th, enter 40 cm of water and aerate. On the morning of May 26th, the hatched leech seedlings were placed at a density of 15,000 seedlings / m 2 , throw in crushed screws 500 g / m 2 , 1 kg per cage. Then you can put 80 grams / pond of Chinese squid with a body weight of less than 0.5 grams / tail. Change the water every 1 day. When changing the water, reduce the water level to about 2 cm. When the water level drops to about 2 cm, rinse the ca...

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Abstract

The invention discloses a leech fry ecological three-dimensional culture method. Based on the characteristic that bitterlings can eat snail meat and carrion, the bitterlings with appropriate sizes are selected and are bred in the leech fry culture water according to an appropriate proportion. During a culture process, the bitterlings can rapidly clean bait left by leeches, objects which cannot be easily cleaned and can easily pollute water can be converted into ammonia nitrogen and then are discharged into the water, then the culture process which is hard to perform in the prior art can be easily completed through water changing and algae culturing, and therefore a high-quality water environment can be provided for the leech fry.

Description

technical field [0001] The invention relates to the field of aquaculture, in particular to an ecological three-dimensional cultivation method for leech seedlings. Background technique [0002] Leeches are called "soft gold". The main problem is that the survival rate of seedlings is low, and the breeding seedlings are extremely scarce, which has become a bottleneck restricting leech breeding. The traditional leech breeding method is to put the hatched seedlings directly into the pond for rearing, but the seedlings of this method are easily eaten by natural enemies. Due to poor swimming ability, the bait biomass in the pond is relatively insufficient and the survival rate is low. The use of concentrated seed cultivation solves these problems and can increase the overall survival rate. However, it is found in the research that the water quality tends to deteriorate when the seedlings are intensively cultivated, and a large number of leech seedlings are prone to die. In the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K67/033A01K61/00
CPCY02A40/81A01K67/033A01K61/00
Inventor 王建国熊良伟王权封琦陶桂庆赵子明
Owner JIANGSU AGRI ANIMAL HUSBANDRY VOCATIONAL COLLEGE
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