Outdoor large-scale spat intermediate culture method

Abstract

The invention discloses an outdoor large-scale spat intermediate culture method. The method comprises the following steps that 1) an outdoor shellfish bed is constructed in a pond; 2) a water level height difference is gradually formed among a higher-place pond, an algae pond and the outdoor shellfish bed in the vertical direction, high-density shrimp culture is carried out in the higher-place pond, fish and shrimp mixed culture is carried out in the algae pond, and intermediate culture on spats is carried out in the outdoor shellfish bed; and 3) culture wastewater is purified: the culture wastewater in the higher-place pond is discharged into the algae pond for ectopic dilution and conversion firstly, the wastewater is changed into fertilizer water to promote the growth of beneficial unicellular algae, then the fertilizer water in the algae pond is introduced into the outdoor shellfish bed, the fertilizer water is changed into purified water through the filter feeding activity of bivalve shellfish, and meanwhile, the unicellular algae are used as bait organisms to promote the growth of the spats, so that the culture wastewater is purified in an ex-situ manner. According to the method, the breeding cost is greatly reduced, the productivity of intermediate culture of the spats is greatly improved, high economic benefits are achieved, the problem of treatment of culture wastewater can be effectively solved, and the method is suitable for popularization and application in areas suitable for breeding of bivalve spats such as clams and razor clams.

Description

technical field

[0001] The invention relates to the field of aquatic products, in particular to a method for intermediate cultivation of outdoor large-scale shellfish seedlings. Background technique

[0002] In recent years, aquaculture pollution has become the third largest pollution source after industrial pollution and domestic pollution, and has become one of the main causes of water pollution in my country. In particular, high-level ponds, factory farming, high-density nursery and other high-density intensive farming waste water are discharged in large quantities, and a large amount of organic pollutants, suspended solids, nitrogen, phosphorus and other nutrients are directly discharged into nearby waters, which will bring about eutrophication in local sea areas. serious problem. As the country pays more and more attention to the protection of the ecological environment of water areas, the issue of aquaculture tail water discharge has attracted great attention from all...

Examples

Embodiment 1

[0023] Embodiment 1: Construction of outdoor shellfish bed

[0024] Build an outdoor shellfish bed in a pond with an area of ​​20 mu and a pond depth of 2.0 meters. Each pond is equipped with a water wheel aerator to stir and mix fertilizer and water to ensure that the fertilizer and water in the outdoor shellfish bed are even; equipped with water intake and algae The pool is connected. Equipped with a drainage gate for discharging purified fertilizer water.

[0025] The area of ​​each outdoor shellfish bed is 200m 2 , The height of the shellfish bed is 30cm, and an aeration tube is set in the outdoor shellfish bed to increase the oxygen of the shellfish seedlings and avoid the sinking of algae in the culture fertilizer water; a shellfish seedling collection tank is equipped on the outside of each shellfish bed for collecting shellfish seedlings.

Embodiment 2

[0026] Embodiment 2: high level pond culture and culture waste water discharge

[0027] Litopenaeus vannamei is cultured in 10 high-level ponds of about 1.5 mu, and 100,000 shrimp seedlings are stocked, with a size of about 0.8 cm. The daily feeding amount is 3% to 7%, and probiotics such as Bacillus and EM bacteria are regularly sprinkled to adjust the water quality. Use the central sewage pipeline ditch system connected to the algae pond to regularly discharge the aquaculture wastewater, so that organic matter such as residual bait manure and decomposed nitrogen and phosphorus are discharged into the algae pond.

Embodiment 3

[0028] Example 3: Algae ponds for polyculture of fish and shrimp and efficient algae purification of tail water

[0029] Carry out polyculture of fish and shrimp in 30 mu of algae ponds, fish such as bluefish and yellowfin sea bream are used to prevent the growth of filamentous algae, each fish is stocked at a density of 400 fish / mu, shrimps are selected from Litopenaeus vannamei, etc., and the density is 20,000 tails per mu;

[0030] The following measures are adopted for efficient cultivation of algae: First, high input of nutrients. In addition to the residual bait feces of mixed culture of fish and shrimp, it also receives aquaculture wastewater of shrimp cultured in high-level ponds to ensure the nitrogen, phosphorus and other nutrients required for efficient algae cultivation. The high consumption of ingredients, and turn on the water wheel aerator to increase oxygen, fully mix the exogenous aquaculture wastewater into the algae and bacteria symbiosis system of the fish ...

technical field

[0001] The invention relates to the field of aquatic products, in particular to a method for intermediate cultivation of outdoor large-scale shellfish seedlings. Background technique

[0002] In recent years, aquaculture pollution has become the third largest pollution source after industrial pollution and domestic pollution, and has become one of the main causes of water pollution in my country. In particular, high-level ponds, factory farming, high-density nursery and other high-density intensive farming waste water are discharged in large quantities, and a large amount of organic pollutants, suspended solids, nitrogen, phosphorus and other nutrients are directly discharged into nearby waters, which will bring about eutrophication in local sea areas. serious problem. As the country pays more and more attention to the protection of the ecological environment of water areas, the issue of aquaculture tail water discharge has attracted great attention from all...

Examples

Embodiment 1

[0023] Embodiment 1: Construction of outdoor shellfish bed

[0024] Build an outdoor shellfish bed in a pond with an area of ​​20 mu and a pond depth of 2.0 meters. Each pond is equipped with a water wheel aerator to stir and mix fertilizer and water to ensure that the fertilizer and water in the outdoor shellfish bed are even; equipped with water intake and algae The pool is connected. Equipped with a drainage gate for discharging purified fertilizer water.

[0025] The area of ​​each outdoor shellfish bed is 200m 2 , The height of the shellfish bed is 30cm, and an aeration tube is set in the outdoor shellfish bed to increase the oxygen of the shellfish seedlings and avoid the sinking of algae in the culture fertilizer water; a shellfish seedling collection tank is equipped on the outside of each shellfish bed for collecting shellfish seedlings.

Embodiment 2

[0026] Embodiment 2: high level pond culture and culture waste water discharge

[0027] Litopenaeus vannamei is cultured in 10 high-level ponds of about 1.5 mu, and 100,000 shrimp seedlings are stocked, with a size of about 0.8 cm. The daily feeding amount is 3% to 7%, and probiotics such as Bacillus and EM bacteria are regularly sprinkled to adjust the water quality. Use the central sewage pipeline ditch system connected to the algae pond to regularly discharge the aquaculture wastewater, so that organic matter such as residual bait manure and decomposed nitrogen and phosphorus are discharged into the algae pond.

Embodiment 3

[0028] Example 3: Algae ponds for polyculture of fish and shrimp and efficient algae purification of tail water

[0029] Carry out polyculture of fish and shrimp in 30 mu of algae ponds, fish such as bluefish and yellowfin sea bream are used to prevent the growth of filamentous algae, each fish is stocked at a density of 400 fish / mu, shrimps are selected from Litopenaeus vannamei, etc., and the density is 20,000 tails per mu;

[0030] The following measures are adopted for efficient cultivation of algae: First, high input of nutrients. In addition to the residual bait feces of mixed culture of fish and shrimp, it also receives aquaculture wastewater of shrimp cultured in high-level ponds to ensure the nitrogen, phosphorus and other nutrients required for efficient algae cultivation. The high consumption of ingredients, and turn on the water wheel aerator to increase oxygen, fully mix the exogenous aquaculture wastewater into the algae and bacteria symbiosis system of the fish ...