Traditional method for detecting oxygen content in fish ponds

During the summer high temperature period, the main sign of the water quality of the aquaculture ponds is the amount of dissolved oxygen in the water. Using the biological estimation of dissolved oxygen in the pond can effectively control the water quality and provide the basis for scientific management. Fish reaction. Different aquatic animal in different waters for dissolved oxygen in pond, put some high requirements on the dissolved oxygen in the aquatic animal, such as carp, bighead and so on, through the observation of these oxygen resistant ability of the fish to estimate reaction of dissolved oxygen in water. Under normal circumstances, the dissolved oxygen in water is greater than 4 mg per liter, such fish have no adverse reactions, and dissolved oxygen is less than 4 mg per liter, such fish prone to adverse reactions. When these fish cluster water, direct air suck swallow is produced, floating phenomenon, show that the dissolved oxygen has been reduced to about 1 milligrams per liter; when the fish mad swim scurry, lying across the surface, suffocation, form the pond, showed that the dissolved oxygen in water has been as low as 0.4-0.6 mg per liter, the need for timely oxygen. See how much phytoplankton is. Phytoplankton photosynthesis in water, the absorption of carbon dioxide, oxygen release, can increase dissolved oxygen in water. Especially green algae in water, which grow vigorously in summer and release large amounts of oxygen, can dissolve oxygen in water as high as 10 milligrams per liter. Therefore, the summer full pool splash water disinfection sterilization drug, should pay attention to prevent the death of a large number of algae, causing pool hypoxia, occurrence of floating phenomenon, and even cause the pond. See the coverage size of aquatic plants. Aquatic plants in the pond can also release oxygen and increase dissolved oxygen through photosynthesis. When the pond water pool full coverage of 1/2, dissolved oxygen per liter in midday can reach more than 10 mg of water, covering an area of the whole pool of 1/3, dissolved oxygen in the water up to 8 milligrams per liter, grass coverage area is larger, the dissolved oxygen in water is high, therefore, planting plants is an effective way to increase the dissolution oxygen. Look at the water color. Color is too light, phytoplankton, dissolved oxygen in water is generally not more than 5 milligrams per liter; color is too thick, so organic matter decomposition, deterioration of water quality, the dissolved oxygen in water is very low at this time, generally not more than 4 milligrams per liter. Suitable water color is bright green, yellow green or blackish green, under this kind of water condition, dissolved oxygen in water can reach 10 mg per liter.

Method for detecting oxygen content in fish pond of modern fishery

The water quality was detected by portable dissolved oxygen apparatus and multiparameter water quality detector

Portable dissolved oxygen meter, JENCO, 9010M, 9020M

Characteristic

9020M measures dissolved oxygen, air saturation, and temperature. Correction value, power off memory function. Automatic temperature compensation function. Manual pressure and salinity compensation function. Memory function of 50 groups of measurement data. Battery shortage warning function. Auto shutdown function. Waterproof body design. Imported polarographic / galvanic cell dissolved oxygen electrode. CMC, ROHS, CE certification.

Multiparameter water quality detector

1. accurately control the parameters of aquaculture water through the network, that is, ammonia nitrogen, temperature, dissolved oxygen, pH, ORP, salinity equivalent. The utility model can automatically adjust in time to ensure that the aquaculture water meets the requirements of fish growth. Can fully reflect the advantages of factory aquaculture.