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Free-air defence method for preventing massive mortality of Hongkong oysters in winters

A Hong Kong oyster, large-scale technology, applied in the field of open air defense to avoid the mass death of Hong Kong oyster in winter, can solve the problems of heavy economic losses and no harvest of oyster pellets, achieve isolation of death environment, easy to promote, prevent large-scale effect of death

Active Publication Date: 2014-07-02
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the high-salinity areas of this death phenomenon first develop, and then gradually spread to low-salinity areas, and finally all estuary areas are fully affected, and large-scale mortality occurs. The mortality rate is 30-90%, or even 100%. The oyster farmers had no harvest and suffered heavy economic losses
So far, scholars have not found out whether bacteria, fungi, viruses, or abnormal physiological indicators of oysters are the cause of their mass death in this special environment, so no effective specific solutions have been formed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Preliminary forecast: On February 13, 2012, there was continuous fog in Zhanjiang, and some dead oysters were found in the Guandu oyster row of Zhanjiang, and some other oysters were dissected, and about 5% of the individual mantles shrank slowly. It is only 1 / 3 to 1 / 10 of the normal oyster body. For this reason, an early forecast of the mass death of oysters in Hong Kong is sent. At this time, the salinity is 20-30ppt, the water temperature is 16-18°C, and the air temperature is 13-21°C.

[0019] b. Exposure treatment: Among the 60 tons of commercial oysters (≥1 age), 10 tons will continue to be suspended in sea water, and 50 tons will be placed on the shore to expose them to the air; piles are piled up, and the height of each pile is 0.5m. In order to prevent direct sunlight, cover them with breathable woven cloth; at the same time, in order to reduce the energy consumption of oysters' physiological metabolism, ice cubes wrapped in breathable plastic bags are used...

Embodiment 2

[0024] a. Preliminary forecast: On February 8, 2012, Yangjiang experienced continuous foggy weather. It was found that some dead oysters appeared in the oyster row of Chengcun, and some other oysters were dissected, and it was found that about ≥8% of the individual mantle shrinkage was slow The contraction speed is only 1 / 3 to 1 / 10 of the normal oyster body. For this purpose, an early forecast of oyster mass mortality in Hong Kong was sent. At this time, the salinity is 22-27ppt, the water temperature is 15-18°C, and the air temperature is 12-20°C.

[0025] b. Exposure treatment: Among 1,200 tons of commercial oysters (≥1 age), 50 tons will continue to be suspended in seawater, and 1,150 tons will be placed on the shore to expose them to the air; piles are piled up, and the height of each pile It is 0.6m. In order to prevent direct sunlight, cover them with breathable woven cloth; at the same time, in order to reduce the energy consumption of oysters' physiological metabolis...

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PUM

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Abstract

The invention discloses a free-air defense method for preventing massive morality of Hongkong oysters in winters. The free-air defense method includes a, early-stage forecasting: transmitting early-stage forecasting of massive morality of the Hongkong oysters once continuous heavy fog weather is forecast in weather reports in late winter and early spring seasons and abnormal morality of lower than or equal to 10% of oysters in high-salinity regions is discovered; b, free-air treatment: harvesting Hongkong oysters older than one age after the forecasting is transmitted at the step a, placing the Hongkong oysters on floating mats or bank sides, exposing the Hongkong oysters in the air, covering the Hongkong oysters by breathable woven fabrics, preventing sunlight from directly irradiating on the Hongkong oysters and keeping the temperature constant within a range from 4 DEG C to 8 DEG C; c, free-air management: watering the Hongkong oysters everyday, keeping the body surfaces of oyster groups in moisture states and maintaining the temperature constant within the range from 4 DEG C to 8 DEG C; d, secondary hanging cultivation: opening the breathable woven fabrics after the continuous heavy fog weather, airing the Hongkong oysters for 3-5h, pouring seawater on the Hongkong oysters, hanging the Hongkong oysters on the floating mats or sinking mats again and cultivating the Hongkong oysters.

Description

Technical field: [0001] The invention belongs to the field of shellfish cultivation in modern marine agriculture, and in particular relates to an exposure defense method for avoiding large-scale death of oysters in Hong Kong in winter. Background technique: [0002] Hong Kong oyster Crassostrea hongkongensis is the main economic species of coastal culture in South my country. It likes to live near estuaries or places with fresh water injection. It is mainly distributed in Guangdong, Guangxi and other places. The annual output is more than 1.3 million tons, and the output value is 8-10 billion. Yuan (China Fisheries Yearbook, 2013). Compared with other types of oysters, the value of Hong Kong oysters is mainly reflected in their large body, fat meat, and delicious taste. In addition, their market value is much higher than that of other types of oysters, and they are favored by consumers in Guangdong, Guangxi, Hong Kong, Macao, and Southeast Asian countries (Zhang Yuehuan, etc....

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 张跃环肖述李琼珍张扬李军喻子牛
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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