Fish Tales - How to Keep Native Freshwater Crayfish - Department of Fisheries, Govt of Western Australia

Setting up a freshwater crayfish aquarium

Signs of Stress
Stress may be caused by the following reasons:

Changes in the Levels of Oxygen
When oxygen levels fall freshwater crayfish will:

Changes in Water Temperature

When the temperatures fall the crayfish become slow and sleepy
When the temperatures are too high, the crayfish become restless and will move back and forth.

Overcrowding

If threatened, the animal will raise its claws. If the threat continues it will flick its tail forwards and dart backwards and upwards to escape.