Oxytetracycline hydrochloride is widely used in veterinary medicine to treat bacterial infections in livestock, poultry, and fish. It is effective against a range of pathogens, including those causing respiratory, urinary, gastrointestinal, and skin infections. In aquaculture, it is commonly administered to control diseases in fish and shellfish, promoting healthier stocks. Additionally, it is used in beekeeping to prevent and treat bacterial infections like American foulbrood in honeybee colonies. Its broad-spectrum antibacterial properties make it a valuable tool in maintaining animal health and productivity.