Baking soda, also known as sodium bicarbonate, serves as a common weak alkaline salt with multifaceted applications in aquaculture. It not only effectively regulates water pH levels but also provides essential nutrients for aquatic animals. Additionally, it aids in disease prevention and control while enhancing the stress resistance of aquatic organisms. However, to fully leverage these benefits, proper usage is crucial. Next, we will delve into the specific roles of baking soda in aquaculture and reveal some important precautions for its use.

Functions of Baking Soda

1. Regulating Pond pH

As a substance with weak alkalinity and strong salt properties, baking soda releases hydroxide ions and bicarbonate ions when dissolved in water, rendering the solution weakly alkaline. In aquaculture, adding appropriate amounts of baking soda to ponds effectively neutralizes acidic substances in the water, preventing rapid pH drops and helping maintain water acid-base balance. pH is a critical physicochemical indicator in aquaculture. An optimal pH range ensures aquatic animals maintain normal growth and reproductive states. When pH is too low, harmful substances like ammonia nitrogen and hydrogen sulfide increase in the water, posing toxic threats to aquatic animals. Conversely, excessively high pH reduces dissolved oxygen levels, impairing the respiration of farmed animals. Therefore, the judicious use of baking soda can control pH within an optimal range, providing aquatic animals with an excellent environment for growth and reproduction.

2. Stabilizing pH Levels

In aquaculture ponds, excessive algae proliferation reduces carbon dioxide (CO₂) concentration while correspondingly increasing bicarbonate ion (HCO₃⁻) levels. Since bicarbonate ions readily dissociate into CO₂ and water in aqueous solutions, this causes rapid pH elevation, inducing stress in farmed animals. Adding baking soda to the water leverages its buffering capacity, effectively preventing drastic pH fluctuations. Similarly, during aquaculture operations, uncontrollable factors like weather changes or massive algal die-offs can cause significant pH swings. Baking soda stabilizes these fluctuations, reducing stress responses in farmed animals caused by large pH variations. Additionally, baking soda binds with heavy metal ions in the water to form insoluble carbonates, thereby reducing the toxicity of these heavy metals to aquatic animals.

3. Enhancing Water Alkalinity

Alkalinity is a crucial indicator of a water body's buffering capacity, directly affecting pH stability. During aquaculture, adding baking soda effectively increases alkalinity, thereby strengthening the water's buffering properties. This practice promotes greater absorption and fixation of carbon dioxide (CO₂) by bicarbonate ions (HCO₃⁻), ensuring pH stability. Simultaneously, increased alkalinity helps elevate total water hardness and reduce heavy metal ion concentrations, thereby mitigating toxicity to aquatic animals.

4. Disease Prevention and Control

Baking soda demonstrates multiple functions in aquaculture, one being disease prevention and control. It serves not only as an antacid but also synergizes with anthelmintic and antifungal medications to effectively combat issues like saprolegniasis, deformed shrimp fertilized eggs, and deformed seaweed larvae. Furthermore, baking soda expels external parasites from farmed animals, safeguarding their health. Its mechanism involves reacting with proteins on fungal and bacterial cell membranes, disrupting their structure to achieve antimicrobial effects. Simultaneously, boosting the immunity of farmed animals is another key strategy for disease prevention, enhancing their disease resistance to ensure smooth aquaculture operations.

5. Enhancing Medicinal Efficacy

During aquaculture, combining baking soda with disinfectants and sterilizing agents further amplifies their therapeutic effects. For instance, mixing penicillin solution with baking soda solution and spraying it in aquaculture ponds effectively suppresses pathogens. This method is convenient, efficient, and cost-effective. Furthermore, baking soda can react with certain heavy metal salt disinfectants to form insoluble carbonates, thereby reducing the toxicity of these disinfectants to aquatic animals.

6. Enhancing Stress Resistance

During aquaculture, adding an appropriate amount of baking soda during large water changes can effectively prevent stress reactions in aquatic animals caused by excessive water volume. Baking soda induces a mild state of hunger in farmed animals, promoting intestinal health and providing a buffer for subsequent feeding. This enhances vitality and vigor, thereby improving stress resistance. Additionally, the application method and dosage of baking soda in aquaculture water are critical. When excessive algae cause significant pH fluctuations between morning and evening, baking soda can be used as a buffer at a rate of approximately 3 kilograms per mu-meter, evenly distributed throughout the pond. During heavy rainfall, pond pH may drop rapidly; baking soda can similarly be used for buffering and pH elevation at 4–5 kilograms per mu-meter, ideally combined with vitamin C application to enhance stress resistance. Additionally, baking soda improves feeding behavior in farmed animals. Its effective neutralization of gastric acid enhances gastrointestinal contractions, reduces digestive fluid viscosity, and stimulates appetite. When fish exhibit unexplained anorexia or poor feeding, administer baking soda orally at 200 grams per 50 kilograms of feed for three consecutive days, given with the first morning meal. Furthermore, baking soda possesses liver detoxification properties. During bacterial disease treatment, it is recommended to administer baking soda alongside hepatoprotective drugs with the first daily meal for detoxification and liver support, while ensuring adequate antibiotic dosage. The oral dosage is 250 grams per 50 kilograms of feed, administered continuously for 3–5 days. Usage and Dosage as a Drug Enhancer: During aquaculture, baking soda not only enhances animals' stress resistance but also serves as a drug enhancer to boost therapeutic efficacy. When administering medications to farmed animals, combine with baking soda to amplify treatment effects. Specific usage methods and dosages should be determined based on actual conditions and veterinary guidance.

Contraindications for Baking Soda Use

1. Avoid Use During High Ammonia Nitrogen Levels

In ponds with elevated ammonia nitrogen concentrations, baking soda often fails to achieve desired results and may even prove counterproductive. High ammonia nitrogen creates complex aquatic conditions where baking soda can trigger adverse chemical reactions, worsening water quality without effectively reducing ammonia nitrogen levels.

2. Use with Caution in Highly Concentrated Water

Baking soda application may stimulate excessive algae proliferation, leading to algal blooms. These blooms consume large amounts of oxygen and may release toxic substances, posing threats to aquatic animals.

3. Caution Regarding Toxicity to Yellowtail

Baking soda exhibits significant toxicity to yellowtail. Therefore, its use should be avoided in high-temperature environments or for juvenile fish weighing less than 100.0g.