The application of betaine hydrochloride in aquaculture is mainly reflected in improving the vitality of fish and shrimp, promoting growth, improving meat quality, and reducing feed efficiency.

Betaine hydrochloride is an efficient, high-quality, and economical nutritional additive widely used in livestock, poultry, and aquaculture. In aquaculture, the main functions of betaine hydrochloride include:
1. Improving survival rate and promoting growth.
2. Improving meat quality: Adding 0.3% betaine hydrochloride to the formulated feed can significantly stimulate feeding, increase daily weight gain, and reduce liver fat content, effectively preventing fatty liver disease.
3. Reduce feed efficiency: By improving the palatability of feed and reducing waste, the feed efficiency can be lowered.
4. Provide methyl donor:  Betaine hydrochloride can provide methyl groups and participate in important metabolic processes, including DNA synthesis, creatine and creatinine synthesis, etc. ‌
5. Promoting fat metabolism: Betaine hydrochloride helps reduce choline oxidation, promote the conversion of homocysteine to methionine, and increase the utilization of methionine for protein synthesis, thereby promoting fat metabolism.
In summary, the application of betaine hydrochloride in aquaculture is multifaceted, which can not only improve aquaculture efficiency but also enhance the quality of aquatic products, and is of great significance for promoting the sustainable development of aquaculture.