Combined netting gear for culturing river crabs in purse seine in lake

A technology for river crabs and lakes, which can be used in fish farming, application, climate change adaptation, etc., and can solve problems that affect farming benefits

Inactive Publication Date: 2010-06-02
FRESHWATER FISHERIES RES CENT OF CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional lake enclosure method of raising crabs mainly adopts a single-layer seine net, and the escape rate of river crabs is as high as 40%, which greatly affects the breeding benefits

Method used

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  • Combined netting gear for culturing river crabs in purse seine in lake
  • Combined netting gear for culturing river crabs in purse seine in lake
  • Combined netting gear for culturing river crabs in purse seine in lake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0011] 1. Site selection and piling. In the dry season, January is used to piling the fence with moso bamboo. The water depth in the fence area is 0.8m, and the water bottom is relatively flat. After the piles are laid, the surface of the water is 2.2m (the highest water level during the breeding period is 2.0m), the pile distance is 3m, and the bamboo piles of the fence are reinforced with inclined piles on the wind-receiving surface. The moso bamboo piles of the inner and outer fences are 3m apart. The fenced water surface area is 40 mu.

[0012] 2. Double-layer seine setting. The material of inner and outer layer fence 5,3 is polyethylene, and inner and outer layer fence 5,3 upper ends are respectively fixed on inner and outer two layers of fence moso bamboo piles with key rope. The mesh of the inner fence 5 is 2.5cm, the bottom is sewn together with the main and auxiliary gabions 7 and 8 respectively, and the distance between them is 0.5m, and they sink into the mud tog...

Embodiment approach 2

[0017] 1. Site selection and piling. In the dry season of December, moso bamboo is used to drive pilings. The water depth in the fence area is 1.0m, and the water bottom is relatively flat. After the piles are laid, the surface of the water is 2.5m (the highest water level during the breeding period is 2.0m), the pile distance is 2.5m, and the fence piles are reinforced with inclined piles on the wind-receiving surface. The bamboo piles of the inner and outer fences are 4.5m apart. The fenced water surface area is 50 mu.

[0018] 2. Double-layer seine setting. Inner and outer layer fence 5,3 are polyethylene materials, and inner and outer layer fence 5,3 upper ends are respectively fixed on inner and outer two layers of fence moso bamboo piles with key rope. The mesh of the inner fence 5 is 2.5cm, and the bottom is sewn together with the main and auxiliary gabions 7 and 8 respectively, and the distance between the two is 0.5m, and they sink into the mud together. The auxil...

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Abstract

The invention belongs to the technical field of aquaculture, and in particular relates to a combined netting gear for culturing river crabs in purse seine in a lake, which is combined by a purse net, galion meshes and other netting gears to prevent river crabs from escaping. An outer purse net and an inner purse net are both fixed on a mao bamboo pile; the bottom of the inner purse net, a main galion mesh and an auxiliary galion mesh are fixed together and sunk into mud; the upper end of the inner purse net is provided with a gamma-shaped reverse covering net (an escape preventing net); the bottom of the outer purse net is inserted into substrate sludge by a ground anchor for fixing; cage meshes are arranged at the water bottom in the middle of the inner purse net and the outer purse net. The combined netting gear has the advantages that the escape of the river crabs can be effective prevented by using two layers of purse nets; the upper end of the inner purse net is provided with the reverse covering net, so that even if the river crabs can creep up to the upper end of the inner purse net and finally reach the reverse covering net, the river crabs can also drop into a purse seine region; the arrangement of the main galion mesh and the auxiliary galion mesh ensures that meshes cannot drift under the condition that the purse nets encounters heavy storm.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and specifically relates to a combined net for lake enclosure and culture of crabs, which can prevent river crabs from escaping and is composed of purse seines, gabion nets, ground cage nets and other nets. Background technique [0002] Crab breeding in lake enclosures is a breeding technique that uses the ecological environment of large waters to enclose a certain part of the waters and breed river crabs in the enclosures. Crab breeding in lake pens has the characteristics of superior breeding conditions, good water quality, high dissolved oxygen, rich aquatic plants, snails and other bait organisms, fast growth of river crabs, few diseases, low cost, high output, and significant economic benefits. However, the traditional lake enclosure method of raising crabs mainly adopts a single-layer seine, and the escape rate of river crabs is as high as 40%, which greatly affects the breeding benefit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 邴旭文徐跑何杰狄瑜胡海彦
Owner FRESHWATER FISHERIES RES CENT OF CHINESE ACAD OF FISHERY SCI
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