水是水产动物生存的根本条件。恶化的水质不仅有害于动物机体的健康,而且还危及它们的生命。养殖水体中,其水质不仅受自然因素的影响还受到人为因素和生物因素的影响,如施肥、投饵、洗刷、施药、排水和灌水,养殖动物的粪便、分泌物、以及水生生物的繁殖、生长和残留废物等等。? Water is the fundamental condition for the survival of aquatic animals. Deteriorating water quality not only detrimental to the health of the animal body, but also endanger their life. Aquaculture water, its water quality is not only affected by natural factors but also by human factors and biological factors, such as fertilization, feeding, scrubbing, spraying, drainage and irrigation, farming animal excrement, secretions, and aquatic organisms , Growing and residual waste and more. ?