Читать книгу Fundamentals of Aquatic Veterinary Medicine - Группа авторов - Страница 28

Oceans, rivers, lakes, and even ponds, are various types of aquatic ecosystems. The abiotic components of aquatic ecosystems are the physical and/or chemical factors characteristic of the environment that act on the living organisms during any part of their life. These abiotic factors are also called ecological factors. They vary from ecosystem to ecosystem; for example, the abiotic factors in the marine biome differ from those of fresh water in terms of chemistry, light, current and temperature.

Some of the chemicophysical parameters of water have a direct influence on fish health. Any abrupt and wider than normal fluctuations of such values cause a state of stress in fish, sometimes resulting in widespread disease outbreaks. Dissolved oxygen content, pH, turbidity, temperature, introduction of some chemicals, detergents, pesticides and naturally produced toxic products like hydrogen sulfide, ammonia, dinoflagellate toxins are potential stress‐related parameters.