CN-121970702-A - Accurate regulation and control method for water quality of largemouth bass culture

Abstract

The invention relates to the technical field of aquaculture, in particular to a precise regulation and control method for the water quality of micropterus salmoides cultivation. The method for regulating and controlling the water quality of the largemouth bass culture provided by the invention has the advantages that one or more of the following conditions are met in the culture water body (1) photosynthetic bacteria are added into the culture water body every day, the final concentration of the photosynthetic bacteria in the water body is controlled to be 10 6 ~10 7 CFU/mL, (2) the dissolved oxygen content of the culture water body is regulated to 5.5-7.5 mg/L, and (3) the temperature of the culture water body is regulated to 26+/-1 ℃ in daytime and 23+/-1 ℃ in night. The invention can obviously reduce total nitrogen, total organic carbon and chemical oxygen demand through day and night temperature regulation and photosynthetic bacteria addition, reduce water changing requirements, reduce eutrophication risk, improve Specific Growth Rate (SGR) and weight growth rate (WGH), optimize immune and antioxidant indexes, and control dissolved oxygen at 7.0mg/L to reduce aeration energy consumption.

Inventors

• CHAI YI
• Wan Zhanghan

Assignees

• 长江大学

Dates

Publication Date

20260505

Application Date

20260311

Claims (6)

1. 1. A method for regulating and controlling the culture water quality of micropterus salmoides is characterized in that the culture water body meets one or more of the following conditions: (1) Adding photosynthetic bacteria into the culture water body every day, and controlling the final concentration of the photosynthetic bacteria in the water body to be maintained at 10 6 ~10 7 CFU/mL; (2) The dissolved oxygen content of the culture water body is adjusted to 5.5-7.5 mg/L; (3) The temperature of the culture water body is regulated to 26+/-1 ℃ in the daytime and 23+/-1 ℃ in the evening.
2. 2. The method for controlling the water quality of micropterus salmoides cultivation according to claim 1, wherein the dissolved oxygen content of the cultivation water body is adjusted to 6.5-7 mg/L.
3. 3. The method for regulating and controlling the water quality for the largemouth bass culture according to claim 1, wherein the dissolved oxygen content of the culture water body is regulated to 6.8-7.2 mg/L.
4. 4. The method for regulating and controlling the water quality of largemouth bass culture according to claim 1, wherein the daytime is 8:00-20:00, and the evening is 20:00-8:00 the next day.
5. 5. The method for regulating and controlling the water quality for micropterus salmoides cultivation according to claim 1, wherein the illumination intensity of the cultivation water body is controlled to be 20+/-3 lx in daytime and 400+/-3 lx in evening.
6. 6. The method for regulating and controlling the culture water quality of micropterus salmoides according to claim 1, wherein the photosynthetic bacteria are rhodopseudomonas palustris (Rhodopseudomonas palustris).

Description

Accurate regulation and control method for water quality of largemouth bass culture Technical Field The invention relates to the technical field of aquaculture, in particular to a precise regulation and control method for the water quality of micropterus salmoides cultivation. Background The largemouth bass (Largemouth bass) is an important famous and excellent aquaculture variety in China, and gradually develops into a high-density and intensive aquaculture mode due to the fact that the largemouth bass grows fast, the meat is delicious and the market demand is vigorous. However, in the high-density cultivation mode, water quality management becomes a key factor for determining the success or failure of cultivation, and directly affects the growth rate, health condition and cultivation economic benefit of fishes. At present, the conventional static management mode is mainly used for the regulation and control of the culture water quality of the micropterus salmoides. The water quality management strategy for the largemouth bass disclosed by the prior art adopts a static threshold management mode at the core, and is specific: The prior art indicates that the proper water temperature range for growth of the micropterus salmoides is 20-30 ℃. In practical operation, in order to prevent the fish body from being stressed, farmers generally tend to maintain the water temperature at a certain constant value (such as constant temperature of 25 ℃ or 26 ℃) in the interval, or the water temperature slowly changes along with seasons, and an active day-night temperature-changing regulation mechanism is lacked, so that the metabolic level of the fish body is single due to long-term constant temperature, and the immune fatigue is caused. The single dissolved oxygen floor control emphasizes that the Dissolved Oxygen (DO) should be kept above 4mg/L in the prior art and is used as a 'safe floor' for ensuring survival. In the intensive cultivation practice, high dissolved oxygen (> 8.0 mg/L) is usually blindly pursued for safety, so that the energy consumption is too high, and the problems of limited bacterial colony activity, limited fish growth or too high aeration energy consumption are easily caused by not establishing an optimal dissolved oxygen balance point for the synergistic effect of fish metabolism and photosynthetic bacteria. Uncoupled microbiological control although the prior art mentions the use of photosynthetic bacteria, bacillus, etc. to purify water, only as an adjunct to the addition, the synergistic coupling relationship between the highly efficient colonisation concentration of photosynthetic bacteria (PSB) and specific dissolved oxygen, specific water temperature rhythms is not clear. The multi-factor regulation and control are mutually isolated, namely, the temperature, the dissolved oxygen and the microbial preparation are only independently and overlapped for use, a cooperative coupling mechanism between the day and night temperature change and the specific dissolved oxygen and the colonization of photosynthetic bacteria is not disclosed, and the synchronous improvement of water quality purification and fish health is difficult to realize. The long-term stability of water quality is poor, the control effect on pollutants such as total nitrogen, ammonia nitrogen, COD and the like is limited, the problems of water acidification, TDS elevation, water quality deterioration and the like are easy to occur in the later period of cultivation, and the requirements of high-density and long-period cultivation cannot be met. In summary, the existing technology for regulating and controlling the water quality of the largemouth bass culture still stays in a rough management stage for survival, and is difficult to achieve the synergistic objectives of stable water quality, growth performance, immune improvement, energy conservation and consumption reduction, so that a precise regulation and control method for the water quality of the largemouth bass culture by coupling temperature rhythms, precise dissolved oxygen and efficient microorganisms is needed. Disclosure of Invention The invention aims to provide a precise regulation and control method for the water quality of largemouth bass culture, which aims to solve the problems in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a method for regulating and controlling the culture water quality of micropterus salmoides, which meets one or more of the following conditions: (1) Adding photosynthetic bacteria into the culture water body every day, and controlling the final concentration of the photosynthetic bacteria in the water body to be maintained at 10 6~107 CFU/mL; (2) The dissolved oxygen content of the culture water body is adjusted to 5.5-7.5 mg/L; (3) The temperature of the culture water body is regulated to 26+/-1 ℃ in the daytime and 23+/-1 ℃ in the evening. Preferabl