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The eggs, attached to the females abdomen, hatch in five to eight weeks. The crayfish leaves its mothers protection in 1-2 weeks after it hatches from the egg. Reproduction is sexual and most often occurs in the spring. Meanwhile, the females will hatch their eggs in 30 days or so (depending on water temperatures). After mating, the female crayfish lays eggs, which hatch and grow into adult crayfish, at which point the cycle starts again. Fertilized eggs seem to turn somewhat brown as they develop, and become more and more transparent as the yolk is consumed and the embryo develops. The female crayfish will take care of the young for a short period of time, but should be removed after a few days to prevent the fry from being eaten. Developing eggs increase in size, and change from a light color to dark as they mature. Crawfish reach adult size in 3-4 months and its life span is 3-8 years long. Crayfish mate in the autumn and lay eggs in the spring. In some European countries, both native and The crayfish will grow and sheds its exoskeleton often. Crawfish eggs are typically laid and fertilised in the burrow where they become attached to the swimmerets on the underside of the females tail. How Your Pet Crayfish Breed. During mating, the male crayfish deposits sperm into the sperm receptacle of the female. The eggs hatch in 2-20 weeks and have the same structure as an adult crawfish. The male will deposit a sack of sperm on the female who at that point will pass her eggs through the sperm to fertilize them. Egg diameter increases from 0.3 mm in stage 2 to up to 1.6 mm in stage 6. After around four weeks, the eggs will hatch and the young crayfish will emerge. It has been reported that different methods can be used for crayfish egg incubation, involving the use of zug-jars, meshed materials, tanks and maternal brooding (Ackefors, 1989; Leonard et al., 2001). I dont recommend moving the female as this can stress her out and cause her to drop the eggs. If you are breeding crayfish at home for the first time, you may want to take some notes. Eventually, you can see eye spots just before the eggs hatch. The eggs hatch in about 2-20 weeks. They leave the mothers protection in about 2 weeks and are very tiny, which makes them susceptible of being eaten. Many baby crayfish are eaten because they are so small. A small crayfish emerges which has all the same structures of an adult crayfish. If you can see some transparency, you know that development is occurring on schedule. The process is called molting. Once laid, eggs hatch in as little as 3 weeks at 21 to 24 C (70 to 75 F) and 4 to 5 months at 12 to 15.6 C (53 60 F). After the third molt, when they reach approximately one-half incubation of crayfish eggs and to obtain early-hatched larvae by increasing water temperature. 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