Origin
European crayfish, Noble crayfish and big-fingered crayfish are the most common species in Europe and a living food.
Like other species, these crayfish live only in freshwater rivers and lakes.
They can be found in France, all of Central Europe, the Balkan peninsula, the British Isles, Scandinavia and the western Soviet Union.
Cancer Food
Crayfish are omnivorous like shrimp and lobsters. That means they eat almost anything.
Cancer feeds on mollusks, aquatic insects, plants and worms, etc.
Grab the food with tongs. The amount of food consumed depends on how often they shed. When they shed they eat their carcass to give them calcium.
Appearance Cancer
The body of cancer consists of cephalothorax and abdomen. At the level of the cephalothorax there are 2 pairs of antennae , with the help of which the cancer senses smell and touches, 2 compound eyes, consisting of hundreds of visual cells. The eyes are located at the top of extensions, which move in all directions.
The mouth is provided with powerful jaws. On the dorsal side of the cephalothorax,5 pairs of articulated legs are caught : the first pair ends with large and powerful pliers, serving to catch food, pairs 2 and 3 have small pliers, and the last 2 pairs end with claws.
The five pairs of legs are clamped by the cephalothorax, the first three pairs ending with pincers; the one on the first pair is the strongest. The abdomen of the crayfish is made up of 7 segments.
The first 5 gates on the ventral side, one pair of legs each. Segment 6 shows laterally, two wide pieces that, together with Segment 7, form the code swimmer. Cancer walks forward on the bottom of the water, using its feet.
When in distress, it pushes the water forward, aided by the paddles of the code swimmer, and suddenly moves the abdomen towards the forelimb.
Thus, he swims back. Cancer breathes through the gills. They are located at the base of the legs and are wedge-shaped. The gills are permanently bathed by a stream of water, which circulates from the back forward, ensuring gas exchange at their level.
Cambarellus montezumae
Cambarellus patzcuarensis
Procambarus acanthophorus
Procambarus allenii
Procambarus clarkii
Procambarus cubensis
Procambarus enoplosternum
Procambarus sp. marble
Procambarus pubescens
Procambarus spiculifer
Procambarus toltecae
Procambarus vasquezae
Procambarus versutus
Cancer Behavior
Crayfish hide Cube stones or logs. they are more active EMF at night.
Adult crayfish (older than one year) are much more active than kept crayfish.
They usually move slowly and cautiously, but if frightened they swim back quickly waving their tail to escape danger.
The wild predators of crayfish are alligators, turtles, otters, some birds, etc.
Cancer Reproduction
Like most animals, crayfish are either male or female, but in most cases they are males.
In the process of mating males put sperm, which is shaped like a small ball of wool, in the lower part of the female's abdomen. It curls its tail and after passing the eggs through the sperm keeps them stuck to the tail for four weeks.
Crayfish that live in areas with colder waters this period increases. For the reason ascesta and others there are variations regarding the gestation period.
Reproduction generally takes place in the spring. Tropical crayfish breed all year round because the temperature of the environment is much more stable.
Unlike saltwater crayfish freshwater crayfish have larger eggs. They become adults after 3-4 years.
