European Crayfish, noble crayfish and big fang crayfish are the most common species in Europe and a traditional food.
Like other species, these crayfish live only in freshwater rivers and lakes.
They can be found in France, Central Europe, the Balkan Peninsula, the British Isles, Scandinavia and the West of the Soviet Union.
Crayfish are omnivores like shrimps and lobsters. That means eating almost anything.
They feeds on mollusks, aquatic insects, plants and worms, etc.
The amount of food it can eat depends on how often you get it. When they shed, they eat their casing to give them calcium.
The crayfish body consists of cephalothorax and abdomen. At the level of the cephalothorax there are 2 pairs of antennas, with which the crab smells, 2 compound eyes, formed of hundreds of visual cells. The eyes are at the top of overtime, moving in all directions.
The mouth is provided with strong 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 feed, pairs 2 and 3 have small pliers, and the last 2 pairs end with claws.
The cephalothorax is captured by the five pairs of legs, the first three pairs ending with a pair of pliers; the one from the first pair is the strongest. The cocoon’s abdomen is made up of 7 segments.
The first 5 wings on the ventral side, a pair of legs. The segment 6 shows sideways, two latched parts, which form together with the codend 7 segment. Crab goes forward on the bottom of the water, using its feet.
When it is in danger, it pushes the water forward, helping with the codend swing pad and abruptly moving the abdomen towards the front.
Thus, he swims back. Crayfish breathes through gills. They are at the base of the legs and have the form of up. The gills are permanently scalded by a stream of water that circulates backward, ensuring gas exchange at their level.
Crayfish hide under stones or logs. They are more active at night.
Adult crayfish (more than one year old) are more active.
They usually move slowly and cautiously, but if they are frightened they swim back quickly, waving their tail to get rid of the danger.
Wild predators are alligators, turtles, otters, some birds, and others.
Like most animals, crayfish are either male or female, but in most cases are male.
In the mating process, males put sperm, which is in the form of a small wool, in the lower abdomen of the female. It curls its tail and after the oule passes through the sperm it keeps them stuck to the tail for four weeks.
Crayfish living in areas with colder waters are increasing this time. Because of the ascetic and others there are variations on and period of gestation.
Generally, reproduction takes place in the spring. Tropical crayfish are breeding all year long because the temperature of the environment is more stable.
Unlike saltwater crayfish, freshwater crayfish have larger ounces. They become adults after 3-4 years.