The first National Aquaculture Mechanization Field Conference was held in Changzhou.


Release time:

2020-11-25

The surge-wave aerator floats on the shimmering water surface like a lifebuoy, while the propeller-type variable-frequency oxygenator creates tiny fountains with its splashing water... This scene, resembling a “water park,” unfolded at the observation site of the first National Aquaculture Mechanization Field Conference. Hosted by the Agricultural Mechanization Administration of the Ministry of Agriculture and Rural Affairs, the conference was recently held in Jintan District, Changzhou City, Jiangsu Province. Over 200 participants attended, including Wang Jiayun, Deputy Director of the Agricultural Mechanization Administration of the Ministry of Agriculture and Rural Affairs, heads of relevant departments, experts and scholars, and representatives from enterprises. The event attracted nearly 40 companies from across the country, showcasing more than 120 types of aquaculture machinery and equipment—the largest number of participating enterprises and products ever featured at a field conference in recent years. On that day, attendees visited an intelligent fish farm located in Zhizhen Town, Jintan District. “The core area of the intelligent fish farm covers 6,500 mu and has a total investment of 500 million yuan. It is the core zone for Jintan District’s efforts to establish a National Agricultural Science and Technology Park and a Jiangsu Provincial Agricultural High-tech Zone, and was included in Jiangsu Province’s major projects for 2020,” said Zhang Jinbiao, Deputy Mayor of Zhizhen Town, Jintan District. A range of advanced machinery—including automatic feeders, aerial broadcasting loudspeakers, automatic mowers, automatic oxygenators, automated water intake and drainage systems, and online water-quality monitoring devices—have already been put into use at this fish farm, enabling mechanization and intelligent operation of key stages in river crab farming. Jintan is known as the “Hometown of Chinese Mitten Crabs,” and river crabs are the district’s first single-product industry to exceed 1.5 billion yuan in output value. However, today, labor shortages and rising labor costs have become major challenges hindering the development of the river crab industry. By taking the lead nationwide in building intelligent fish farms, Jintan District is making a valuable exploration toward accelerating the mechanization of river crab production.

The surge-wave aerator floats on the rippling water surface just like a lifebuoy, while the variable-frequency water-wheel aerator creates tiny fountains with its splashing water... This scene, resembling a “water park,” unfolded at the observation site of the first National Aquaculture Mechanization Field Conference. Hosted by the Agricultural Mechanization Administration of the Ministry of Agriculture and Rural Affairs, the conference was recently held in Jintan District, Changzhou City, Jiangsu Province. Over 200 participants attended, including Wang Jiayun, Deputy Director of the Agricultural Mechanization Administration of the Ministry of Agriculture and Rural Affairs, heads of relevant departments, experts and scholars, and representatives from enterprises. The event drew nearly 40 companies from across the country, showcasing more than 120 types of aquaculture machinery and equipment—a record-breaking number of participating enterprises and products in recent years.

On that day, the attendees visited the smart fish farm located in Zhizhen Town, Jintan District. “The core area of the smart fish farm covers a planned construction area of 6,500 mu and has a total investment of 500 million yuan. It serves as the core zone for Jintan District’s efforts to establish a National Agricultural Science and Technology Park and a Jiangsu Provincial Agricultural High-tech Zone, and was included in Jiangsu Province’s major projects for 2020,” said Zhang Jinbiao, Deputy Mayor of Zhizhen Town, Jintan District. A range of advanced machinery—including automatic feeders, aerial broadcasting and voice-communication devices, automatic mowers, automatic oxygenators, automated water intake and drainage systems, and online water-quality monitoring equipment—has already been put into use at the fish farm, enabling the mechanization and intelligentization of key stages in river crab farming.

Jintan is known as the “Hometown of Chinese Mitten Crabs,” and river crabs are the district’s first single-product industry to surpass 1.5 billion yuan in output value. However, the current shortage of labor and the continuous rise in labor costs have become major challenges hindering the development of the river crab industry. The district has taken the lead nationwide in building smart aquaculture farms, representing a promising exploration aimed at accelerating the mechanization of river crab production.

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The relationship between water convection and dissolved oxygen levels in aquatic bodies: The introduction of an aeration device can effectively regulate dissolved oxygen levels.

Although fish floating to the surface can be caused by a variety of factors, in addition to excessive stocking density, overloading the total fish biomass, and poor water quality, the convective properties of water are also a major factor that cannot be overlooked. Simply put, when water temperature is low, its specific gravity (or density) increases, causing it to sink; conversely, when water temperature is high, its specific gravity (or density) decreases, making it float upward. Understanding and mastering the principles of water convection will greatly facilitate the smooth operation of aquaculture. On warm days, after being heated by the sun during the day, the warmer, lighter water tends to stay on top. As the sun sets and the air temperature begins to drop, the upper layer of water cools down, increasing its density, and gradually starts to sink. If the nighttime temperature remains relatively high, the water cools down slowly, and the upper layer won't reach the bottom of the pond until early morning. This is one of the main reasons why oxygen levels tend to drop sharply from late night into early morning on hot days. However, if a heavy rainstorm occurs in the evening, the situation changes dramatically. The cold, heavy rainwater quickly sinks to the bottom of the pond, stirring up sediment, leftover feed, fecal waste, biological residues, and other organic matter from the pond bottom and bringing them into the middle and upper layers of the water. These harmful organic substances rapidly deplete the dissolved oxygen in the water. Before dawn even breaks, the dissolved oxygen in the water may be completely used up, leaving the fish vulnerable to oxygen depletion and causing them to float to the surface—a phenomenon known as "floating and surfacing." Therefore, sudden heavy rainfall in the evening or at night can also lead to oxygen depletion and fish floating to the surface.

2020-11-12