![]() However, they can also be seen very often in southern Queensland, and in the south and north of the territory of this country. The blue crayfish are distributed throughout the length and breadth of Australia, being Victoria and New Wales, the places where they are more popular. Although they prefer waters with temperatures between twenty and twenty-five degrees, the Yabies can also tolerate temperature ranges between 1 ° C and 35 °. The blue crayfish are freshwater and semi-aquatic creatures which need extensive vegetation, but above all, high levels of oxygen concentration in the water. This condition also protects them from predators. The fact of being buried in the mud at a certain depth, and remaining in a state of lethargy, which can sometimes last up to a year, until the rains return, makes it easier for them to survive intense periods of drought. These animals have a powerful advantage that is that they can live in seasonal water courses and survive the drought. They usually prefer crystal clear waters, although they can also be found in other places, of different temperatures.įor this reason the blue crabs can adapt to warm streams as well as to cold lakes. This species of singular beauty can be found in the lowlands, specifically where there are different concentrations of water such as dykes, streams, wells, swamps, reserv oirs. Once the molting has been carried out, little by little they begin to harden their new shell making use of their internal deposits of calcium.Īlthough the blue crabs are often sensitive to environmental changes, these crustaceans have expanded and consolidated in diverse environments. This allows them to have enough space to develop their internal muscles and organs. When they abandon their old shell, they ingest large amounts of water to fill their internal structures, and thus be able to increase in size. Like the vast majority of crabs, blue crabs must molt their exoskeleton, once a year in the case of adult specimens. On the other hand, the female owns the pleopods of its tail longer than the male, since she will lodge the clusters of eggs in them. The other differences are easier to appreciate, because they are related with the size of the male, which is a bit larger compared to that of the female, as well as the robustness of its tweezers. While in the male, its reproductive organ is located at the base of the fifth pair of legs, and is a setoff of its exoskeleton, similar to the head of a pin. In the case female blue crabs, the reproductive organ is located at the base of the third pair of legs, and has an ovoid and transparent shape. The first difference relies on the location of the genital pores. Main differences between both sexesĪlthough in appearance they can be very similar, these animals have marked differences. When the blue crayfish are in the proper conditions, they can measure between twenty-five (25) and thirty (30) centimeters long, and reach two hundred and fifty (250) grams of weight of which twenty percent corresponds to the tail. They have a pair of large tentacles (or antennae) for that purpose.Īll crayfish have their heads and internal organs protected by a carapace (shell), unlike the six segments of the abdomen, which are covered with a flexible membrane, but individually, in order to allow them move. They have two eyes at the end of the appendages but the senses of touch and taste are much more important for them. The front clamps, are used by the blue crabs to feed, and also to dig up to two meters deep.Īdditionally, they have a central fin on their tails, which is surrounded by four other fins that they use to move quickly through the water, as well as to completely roll up to form a nest. The cheraz destroyers h ave a pair of large claws on their frontal portion followed by f our pairs of walking legs and four pairs of small swimming legs called pleopods, which are covered with fine hairs where the female carries her eggs. The head and internal organs of these crabs are protected by the shell and the six segments of their abdomen are covered individually by a flexible membrane that facilitates their movement.
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