A.Sandy bottom

Sand bottom pools are mostly distributed in coastal areas, the main problems include: 
1.The water seepage is serious, the water level can not be kept stable; 
2.Water quality is unstable, difficult to keep fertile, difficult to fertilize water, algae is hard to charge; 
3.Easy to lose microorganisms, difficult to establish a good nitrogen cycle, bottom is easy to go bad.
In general, the side film will be laid, quicklime and inorganic fertilizer will be poured before breeding, and EM bacteria and organic fertilizer will be added 3-5 days after breeding to avoid water and fertilizer in the middle and late stage. According to the breeding situation, some benthic fish can be raised to promote the formation of active silt.

B.The gravel bottom

The more common breeding bottom quality, the bottom mud and stone is slightly hard, has a certain basic fertility and bacteria reservoir, the common problem is that with the increase of breeding years, the pond is not complete or not clear the pond, prone to bad water quality indicators exceed the standard, parasites can not be completely killed. Old pond breeding before quicklime disinfection, after using sodium humic acid, organic fertilizer poured bottom. In general, EM bacteria were supplemented once in 15 days in the early stage of breeding and once a week in the middle and late stage.

C.Muck bottom

 The same more common substrate situation, more appear in the pond with long breeding years, thick sediment layer. The bottom layer is easy to breed harmful bacteria, parasites, etc., hydrogen sulfide is easy to exceed the standard in the middle and late stage, high phosphorus content, easy to breed blue algae and other harmful algae.

This bottom should be accepted in the breeding cycle of the bottom of the pond, timely dredging after the year to ensure that the silt thickness is less than 5-7cm, and disinfected with chlorine preparation; fertilizer try to choose carbon fertilizer less nitrogen and phosphate fertilizer, choose probiotics (spores, EM bacteria) biological bottom or slow-release oxidation bottom, cross use effect is better, with oxygen or set up oxygen to reduce bottom oxygen debt can increase efficiency.

D. Red bottom

The low coastal terrain is relatively concentrated, with low total alkalinity, large water pH fluctuation, and the typical acid sulfate soil, easy to acid reflux and high heavy metal content. Generally, it is not recommended to breed in this area. However, a large amount of organic fertilizer should be supplemented in advance and quicklime is used to improve the total alkali of the water. Do not expose to the bottom of the pond or reverse acid; the breeding process is timely according to the water color to prevent water change.

E. Plastic film bottom, cement pool

No water seepage, there is a sewage outlet, the general bottom quality is relatively clean. However, the lack of material exchange with the soil, the water is prone to carbon shortage, phosphorus, black plastic film heat absorption is serious, the high temperature period is easy to accumulate bottom heat caused by stealing death. Common in high-level pool breeding, it is generally recommended that the water depth is more than 2 meters. The water quality pretreatment needs one-to three-level sedimentation tank and disinfection tank before water intake.

F. Salt base
Saline and alkali content is high, the premise of breeding forward water immersion, drainage after the bottom of the tank covered with topsoil, aquaculture process of organic fertilizer and EM bacteria as much as possible, reduce the application of effervescent tablets and other preparations, to avoid the bottom of the tank turning.