Strengthen Water Quality Management and Improve Aquaculture Environment
Water quality and sediment quality regulation. After entering March, the temperature rose rapidly, which could easily lead to water temperature, dissolved oxygen stratification, pool water can not be convection, and water quality and sediment quality are likely to deteriorate. In view of this situation, the pond with aeration equipment should be turned on for oxygenation at a daily temperature higher than the water temperature, and the opening time should be about 30 minutes to 60 minutes to improve the water environment. For ponds that do not have oxygen aeration facilities, aerators and sediment modifiers should be applied once every 15 days to 20 days in order to improve the ecological environment at the bottom of the pond and prevent oxygen deficiency in the bottom water. If the sediment quality deteriorates severely, it is recommended to disinfect and change the bottom. Chlorine dioxide can be used to disinfect the whole pool with 1 kg of chlorine dioxide tablets per acre.
Science changes water. At the beginning of March, appropriate amount of water can be changed, and the water level of the pool water should be gradually lowered. A gentle water changing method should be adopted. Avoid large-scale irrigation. When monitoring water, various physical and chemical indicators of seawater (water temperature, salinity, etc.) should be monitored. A small number of multiple times, each time changing the water to not more than 10% -15% of the total body of water is appropriate. Then gradually change the daily water volume to about 20%. When you enter the water, you should choose to do it at noon or noonday. After the water temperature reaches 10°C or more, the depth of the pool water is maintained at 0.7-1.0 meters. In May, the water level will gradually increase to 1.0-1.3 meters as the temperature increases. We must pay close attention to weather changes and if there is a "cold spring" weather, we must raise the water level in the pond and keep the water temperature stable.
Reasonable fertilizer, control algae growth. In the early spring season, the pool water is thin and there are few biological feeds. The fertilizer and water can be used at the end of March, and the basic bait is cultured with fermented organic fertilizer or inorganic fertilizer. Not only increase the amount of natural food in the pool, increase the dissolved oxygen in the water, but also reduce the transparency of the pool water, so that sea cucumbers are protected from strong light and the water color is light brown. When we find that harmful algae such as moss and weeds multiply too quickly, we must pay attention to timely fishing, keep the water in the pool fresh, and control the transparency to be 50 cm-70 cm.
Reasonable Feeding Promotes Growth of Sea Cucumber
After a warm winter, some sea cucumbers start feeding, and natural foods are often insufficient. Feeding artificial bait can improve the resistance of sea cucumbers and promote the rapid growth of sea cucumbers. Water temperature can be put into the spring when the water temperature is above 8°C, and 1 to 2 artificial feeds per week depending on the specific conditions of the natural food at the bottom of the pond, including full-price feeds. The food can be added in an amount of vitamins, amino acids and other nutrients. According to the actual situation, reasonable control of the amount of feeding can not only meet the growing demand of sea cucumber, but also will not increase the oxygen consumption because of too much bait accumulation in the bottom of the pool. Each feeding amount is roughly 2%-5% of the total weight of the sea cucumber in the pond. .
Do preventive measures to prevent the occurrence of diseases
Spring is the high incidence of sea cucumber disease, and necessary preventive measures must be taken. The first is the regular application of zeolite or activated carbon to adsorb ammonia, nitrite, and other toxic substances in the water to improve the water environment. The second is to promptly splash vitamin C and other immune enhancers to enhance the sea cucumber immunity and resistance. Microorganisms, such as photosynthetic bacteria, Bacillus spp., yeasts, and other beneficial microorganisms, have been introduced to improve the environment of cultured ponds. The third is early detection, early isolation and early treatment. Frequent inspections of sea cucumber activity, timely diagnosis of stichopus, which is not sick and with strong vitality, are soaked with 10 mg/L povidone iodine for half an hour, and then isolated until recovery. After the collapse of the sea cucumber, it must be dealt with promptly.
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