First, fertilizer water quality. The fertilizer is rich in water, oily green (including blue-green, yellow-green and green beans) or brown (including brown, reddish-brown and dark brown), with a transparency of 20-30 cm, with obvious daily and monthly changes, water body Medium plankton content, dissolved oxygen conditions are better. Fertilizer in general pond culture requires fertilizer, live, tender and cool, fertilizer is sufficient nitrogen and phosphorus elements, trace elements and nutrient salts in water body, plankton is abundant in quantity, and algae are more easily digested by fish; live plankton The production volume and consumption have reached a dynamic balance. There are obvious daily and monthly changes in the water color. The water in the same pool is of different shades of water, or early in the morning, late in the morning in the green and early in the morning and evening, and tender in the water. The amount of phytoplankton that fish digest and absorb is very large. The phytoplankton cells are not aged. The content of phytoplankton in cyanobacteria is less, and the water color is tender and fresh like mung bean soup. The cool water is not dense and not light, the water surface is free of froth, refreshing, and the transparency is 20~ Between 0 cm.
Second, thin water quality. The water quality of the thin water is light, light green or yellowish, and its transparency is more than 30 cm. There are daily changes and monthly changes. The dissolved oxygen conditions are excellent, but the plankton content in the water is small. The formation of lean water quality is caused by infrequent fertilization on the one hand, and on the other hand, the newly excavated ponds do not have fertility to make the pool water fat. Lean water quality is not conducive to breeding fertilized water fish, but it is very beneficial for the cultivation of eating fish.
Third, the old water quality. The water quality of the old water is very strong, with a strong green or dark brown color. The transparency is lower than 20 cm. The water solubility of oxygen in the bottom of the pond is very poor. The cyanobacteria content in the phytoplankton is the highest. The aging of cyanobacterial phytoplankton cells is not conducive to the digestion and absorption of fish. . The reasons for the formation of old water quality are as follows: 1. Insufficient amount of fertilizer, lack of oxygen, phosphorus or other trace elements and nutrients in the water for a long time, and the type of phytoplankton in the water is monotonous; 2. Exchange of water sources, resulting in insufficient water for dissolved oxygen; 3 The tall trees or tall buildings around the pond are obstructed, resulting in insufficient light conditions and low transparency; 4. Excessive accumulation of metabolites, mainly due to cleaning and disinfection around the food field; 5. Regular feeding of acidic feed, fertilizer or application Excessive amounts of alkaline drugs and fertilizers cause the pH of the water to change too quickly.
Fourth, change the water quality. The water quality of the diverted water is commonly known as water bloom, and the water quality is fertile. The water color is thick green, blue-green or red sauce. The water surface is often covered with cloud-like blooms, and the transparency is low. The monthly changes are obvious. The content of phytoplankton in the water body is extremely high, but its species are few. When the water quality of the diverted water is dark, the turbidity is very large, and a strong smell of stench can be smelled down the pond. The reason for the formation of water quality is often due to improper feeding and management. When encountering continuous rainy weather, hot weather, or weather that is not thoroughly exposed to thunderstorms, due to the large number of phytoplankton blooms in the water, nutrients are supplied to the photosynthesis metabolism of phytoplankton. Insufficient class, coupled with the lack of sufficient light, caused a large number of deaths of algae, decomposition and production of toxic substances, resulting in a large number of fish killed in ponds, commonly known as "pan-tang" or "pan-pool." The water quality of the conversion occurred mostly in the summer and autumn hot seasons. When water quality occurs, the water is seriously deficient in oxygen, and fish often floats, affecting growth. Therefore, we must strengthen the management of water blooms, such as regular injection of new water or regular spills of water quality improver to ensure safe production of pond culture.
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