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Environment-friendly method for culturing fish by using net cages

A net cage fish farming, net cage technology, applied in fish farming, application, climate change adaptation, etc., can solve the problems of fish grabbing food, taking food, affecting the inner hole and water flow exchange of the net cage, water pollution, etc. Achieve the effects of reducing the impact on the water environment, saving manual cleaning costs, and reducing feed waste

Inactive Publication Date: 2011-08-10
YANGTZE RIVER FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the breeding process, its residual bait and fish excrement and feces are deposited year by year, resulting in eutrophication of water quality in some large and medium-sized waters, polluting water quality, and gradually deteriorating water quality. The quality is reduced, and the parasitic shellfish, algae and snails on the cage are easy to block the mesh, affecting the inner hole of the cage and the water flow exchange. It needs to be cleaned regularly, which increases the cost and reduces the efficiency of the cage culture, thus restricting the cage culture sustainable development of the industry
[0003] In recent years, many places have promoted the polyculture of different fish species in net cages, but it is easy for the fish species to snatch food, which affects the activity and growth of the main fish species and reduces the breeding efficiency. reduce

Method used

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  • Environment-friendly method for culturing fish by using net cages
  • Environment-friendly method for culturing fish by using net cages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take a set of 4+1 cage fish farming method as an example:

[0027] 1. The set-up cage is composed of 5 cages with inner and outer double-layer set cages, including a large cage, the outer cage and 4 small cages, the inner cage. The size of the large cage is 11m×8.5 m×6m (length×width×depth), mesh size 2a=8cm; size of small cage is 5m×4m×4m (length×width×depth), mesh size 2a=6cm, 4 small nets The cages are evenly distributed in the large net cages in the shape of a "field", and the "ten"-shaped gap in the middle of the large net cages is set up as a sidewalk. Two 15w energy-saving lamps are set up on the walkway. The cage frame is built with 50mm diameter galvanized steel pipe and fasteners. Oil drums are placed around the large net cage and on the middle aisle as floats, bagged pebbles are used around the bottom of the large net cage as sinkers, and small net cages are supported by a 3.5m×4.5m round steel frame at the bottom, and 2a=0.5cm The dense mesh sheet is used a...

Embodiment 2

[0047] Take a set of 1+1 net cage fish farming method as an example:

[0048] 1. The set cage is composed of 2 cages, the inner and outer double-layer set cages, including a large cage, an outer cage and a small cage, the inner cage. The size of the large cage is 7m×5m× 5m (ie length × width × depth), mesh size 2a = 8cm; small cage size 6m × 4m × 3m (ie length × width × depth), mesh size 2a = 3cm. The frame of the net cage is built with galvanized steel pipes with a diameter of 50 mm and fasteners. The empty oil drums are placed around the large net cage as floats, and bags of pebbles are used around the bottom of the large net cage as sinkers. The small net cages use 2a=0.5cm dense mesh The whole bottom feed table is made of slices.

[0049]2. Breeding varieties and specifications: the species stocked in the inner net cage is the southern largemouth catfish, the average size is 30g / tail, and the stocking density is 25 fish / m 2 , a total of 600 southern largemouth catfish we...

Embodiment 3

[0053] Take a set of 2+1 net cage fish farming method as an example:

[0054] 1. The set-up cage is composed of 3 cages with inner and outer double-layer sets of cages, including a large cage, an outer cage and a small cage, which is the inner cage. The size of the large (outer) cage is 9m ×5m×5m (i.e. length × width × depth), mesh size 2a=8cm; small (inner) cage size is 4m×4m×3m (i.e. length×width×depth), mesh size 2a=3cm. The frame of the net cage is built with galvanized steel pipes with a diameter of 50 mm and fasteners. The empty oil drums are placed around the large net cage as floats, and bags of pebbles are used around the bottom of the large net cage as sinkers. The small net cages use 2a=0.5cm dense mesh The whole bottom feed table is made of slices;

[0055] 2. Stocking species and specifications: the stocking species in the inner cage is channel catfish, the average size is 55g / tail, and the stocking density is 110 fish / m 2 , a total of 3,520 channel catfish were...

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Abstract

The invention provides an environment-friendly method for culturing fish by using net cages and relates to a technique for culturing fish by using the net cages. In the method, one or more inner net cages are sleeved in an outer net cage; predatory fish is cultured in the inner net cages; and omnivorous fish, filter fish, or omnivorous fish and filter fish are cultured in the gap between the outer net cage and the inner net cages, wherein the omnivorous fish or the filter fish feed on residual baits and excreta of the predatory fish and animals and plants attached to meshes. By the method, water environmental pollution due to eutrophication of water environment caused by fish culture in the net cages is avoided; pollution-free fish culture is realized; utilization ratio of the bait is increased; breeding cost is reduced; and economical benefit is increased.

Description

technical field [0001] The invention relates to net cage fish culture technology. Background technique [0002] Since 1973, after the introduction of cage fish farming technology in our country, by the 1980s, there were more than 500 hectares of cage culture on large water surfaces such as lakes and reservoirs, and the average fish production per hectare was about 300 tons. . Since the 1990s, the cage fish farming industry has shown a trend of vigorous development. The scale and density of cage farming have continued to increase, and the aquaculture area and production have increased rapidly. Because the cage fish culture technology that introduces all is the technology of single cage culture fishery. Therefore, in the breeding process, its residual bait and fish excrement and feces are deposited year by year, resulting in eutrophication of water quality in some large and medium-sized waters, polluting water quality, and gradually deteriorating water quality. The quality ...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 杨德国朱永久
Owner YANGTZE RIVER FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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