Sea cucumbers suffer severe production losses from high summer temperatures - how can they be farmed well?

The period from July to September each year is when air temperature and the water temperature of sea cucumber (Apostichopus japonicus) aquaculture ponds reach their highest values. The high temperatures during this period pose a considerable danger to pond-cultured sea cucumbers, so farming units must pay special attention. In order to ensure the normal growth of pond-cultured sea cucumbers, reduce losses, and achieve the expected production targets, the high-temperature sea cucumber farming techniques for sea cucumber aquaculture ponds during July-September are as follows:

I. Requirements for water quality conditions

Water temperature 14-20C, salinity 23~32. According to tests by the Fisheries Research Institute of Shandong Haodangjia Ocean Development Co., Ltd., the seawater salinity of the pond must not fall below 20, pH 7.8-8.5, dissolved oxygen 4.0mg/L or above, and ammonia nitrogen 0.1mg/L or below. Water quality is key in sea cucumber farming; the water quality condition must be closely monitored and adjustment measures made promptly to ensure the safety and growth of the sea cucumbers.

II. Water intake and drainage

Make the most of the spring tide periods for water intake and drainage. When taking in and draining water, you must observe whether the offshore seawater has pollution such as red tides; you must check whether the salinity is suitable. The timing of water intake and drainage can be handled flexibly; if due to weather, wind direction, wind force or other reasons, it can be advanced or postponed. III. Regularly apply beneficial microbial preparations

1. Application time: use immediately after the water change during the spring tide. If affected by the lake water, it can be postponed accordingly.

2. Application amount: the normal application rate is 2kg per 667 sq m each time. In special circumstances, it can be increased appropriately.

3. Application method: mix the microbial preparation with water and splash it evenly over the whole pond; the dead corners of the pond can be splashed with a little more; the mixing ratio with water can be 1:50~100.

4. Precautions: microbial preparations must not be mixed with antibiotics, disinfectants, etc., and can only be used 3 days after antibiotics, disinfectants, etc. have been applied. Adding an oxygen enhancer at the same time as applying the microbial preparation will give better results.

III. Remove green algae, ditch grass and other weeds that grow profusely

If green algae, ditch grass and other algae reproduce profusely in the sea cucumber pond, they must be removed promptly; otherwise, the algae will age, sink to the bottom of the pond and rot, which will inevitably lead to the production of harmful substances such as hydrogen sulfide, ammonia nitrogen and methane, causing oxygen deficiency at the bottom of the sea cucumber pond, or after the algae die they press on the bodies of the sea cucumbers and cause local oxygen deficiency, leading to the death of the sea cucumbers.

IV. Oxygen enhancement

Because the weather at this time is relatively hot and humid and the air pressure is relatively low, the natural dissolved oxygen content of the seawater is affected. Therefore, when the weather is hot and humid, there is thunder, or the air pressure is low, use oxygen enhancement machines or oxygen enhancers to increase oxygen, or have workers use boats and boards to stir the seawater to increase the dissolved oxygen content. If conditions permit, when the salinity of the offshore seawater is above 22, change the water as much as possible to increase dissolved oxygen.

During high-temperature periods, because leftover bait, feces and other organic matter from the sea cucumbers at the bottom of the aquaculture pond tend to rot, and because the green algae and other algae in the pond reproduce and rot, harmful substances such as ammonia nitrogen and hydrogen sulfide at the bottom of the aquaculture pond increase. In addition, due to hot and humid weather, low air pressure, frequent rainfall, and abundant fresh water, the salinity of the seawater in the pond decreases, which leads to a continuous decline in the dissolved oxygen in the aquaculture water body, causing the cultured organisms to become diseased and die. The above is what the Tuliu.com editor has brought to you