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Good or bad water quality is one of the key factors in the success or failure of fish farming. The criterion for judging whether the water quality is good or not is to see if it meets the requirements of “fat, live, tender, and coolâ€. Under normal circumstances, a simple judgment of water quality can be made based on the water color. Water color depends on many factors, but the water color in the pool water is mainly determined by the proportion of different plankton (mainly various algae) breeding. The phenomenon of a large number of plankton blooms resulting in denser water or even algal blooms and floating membranes is called bloom. Different algae grow in different bodies of water, but different algae contain different pigments, which results in inconsistent colors and different concentrations of pool water. Algae are the original producers in the water body and are the direct or indirect material basis for the growth of farmed fish. They have a very close relationship with fishery production. Here are some of the common water colors used in aquaculture production: (1) The water color is yellow-green and refreshing. It is good water. The color indicates that the shade of water is moderate, and the algae in the water body are mainly diatoms, followed by green algae and bare algae. (2) The water color is grass green and refreshing, which is good water. The color indicates that the water color is thick, and the algae in the water body are mainly composed of green algae and bare algae. (3) The water color is oil green and is good water. The color indicates that water quality is moderate and thin, and this kind of water color is more common in the water applied organic fertilizer. The algae in the water body are mainly diatoms, green algae, dinoflagellates and cyanobacteria, and the quantity is relatively balanced. (4) The color of the water is dark brown, which is good water. The color indicates that water quality is moderate and thin, and this kind of water color is more common in the water applied organic fertilizer. The humic substance concentration in this water-colored water body is larger, and the algae in the water body are mainly diatoms and cryptophytes, followed by euglena, green algae and dinoflagellates. (5) The water color is blue-green, grayish green and muddy, and the hot weather often appears on the water table on the side of the pond's breeze. The color indicates the aging of the water quality of the water body. The algae in the water body are dominated by blue-green algae, and the quantity is dominant. (6) The water is grayish yellow, orange-yellow and turbid. There is a floating film of the same color on the water meter. It is bad water. The color indicates that the color of the water body is too thick, and the water quality is deteriorated. The algae in the water body are mainly cyanobacteria, and a large number of deaths have begun. (7) The color of the water is gray and it is bad water. The color indicates that a large amount of plankton in the water body has just died, the water quality has deteriorated, and the water body is seriously deprived of oxygen, and there is often the danger of flooding ponds. (8) The water color is dark brown and it is bad water. This color indicates that the water color is older and nearer to deteriorate. It may be caused by the application of too much organic fertilizer, and the content of humus in the water is too much. The algal species in the water body is dominated by cryptophytes, followed by blue-green algae and bare algae. (9) The water color is light red, and the color is often unevenly distributed, which is bad water. This color indicates that the otters in the water have excessive breeding and very few algae. This water-colored water body has a low dissolved oxygen content and has turned into a water phenomenon with relatively thin water. (10) For brown water, the brown water formed at the early stage of fertilization is good water, and the water that turns from other water color to brown in the middle and later stages is bad water. By observing the water color, we can know whether the water quality is good or bad, so that we can take effective measures (such as draining old water, injecting new water, fertilizing, etc.) to improve the water quality for the healthy and rapid growth of fish.