The first step to disease prevention in fish hatcheries is often the disinfection of influent water. Water from aquifers and deep wells is often pathogen-free, but surface water, particularly from streams or rivers with natural fish populations may not be so. Effective influent water treatment can prevent catastrophic mortalities or deformities in fish hatcheries. Thus the quality of the water entering the facility dictates the type of treatment required. Some of the more common and often necessary treatments required for influent water are gas balancing, solids filtration and disinfection. No matter the origin of the water, whether from a well, a stream, ground water or a seawater source, disinfection should be included to deal with dangerous microorganisms such as parasites, bacteria, viruses, mould and fungi.
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