Сrayfish is very fastidious in relation to the world around them, rather than think of others, including experts on this. Just studying these issues, few people involved, unlike other crayfish, but also some information about these facts there. The aqueous medium in which crayfish tend to be, must necessarily be unleavened type and nothing else can be no question, as too salty water, they can not reproduce themselves in the light. The amount of oxygen necessary to the same crayfish as salmon fish, that is large enough. It should be the same crayfish breathe! For the stable livelihoods of crayfish in the warmer seasons of the year in the water must contain a large amount of oxygen. Сrayfish can live quietly in the dark and in the bright water, the main thing that was a great level of acidity. The growth of crayfish in water without lime slows significantly. Сrayfish are very sensitive to a variety of contaminants. The dirty, untreated water, you will never see the crabs, they are very fond of himself. In the polluted body of water crabs may die. If there is a favorable condition for life and comfort, the crabs can live in the lake, oxbow lake, river, creek and pond. But more often they settle it in the rivers. Why in the rivers, only seen them. The ideal pH value for all crayfish is seven.
That such cancers in our river caught the children)
Правильней будет в заголовке написать "crayfish", "cancer" - это раковая опухоль =). Иногда переводчик может вот так "пошутить"... Да и по ходу текста заменить.